Show the pick path in the hover card

Biome title, pick tree with noise bands.

core/src/main/java/com/volmit/iris/core/gui/MapCanvas.java

@@ -1103,7 +1103,7 @@ final class MapCanvas extends JPanel {
         double worldZ = screenToWorldZ(point.y);
         controller.submitProbe(
                 frame,
-                () -> MapHoverProbe.sample(probeEngine, worldX, worldZ, previewedRegion(), currentType.drawsPickNoise()),
+                () -> MapHoverProbe.sample(probeEngine, worldX, worldZ, previewedRegion(), hoverExplainsBiomePick()),
                 details -> {
                     QuickHover quick = quickHover;
                     if (quick != null && quick.worldX() == details.worldX() && quick.worldZ() == details.worldZ()) {
@@ -1114,6 +1114,11 @@ final class MapCanvas extends JPanel {
         );
     }
 
+    // These views' hover card names the surface biome, so the whole way to it is worth looking up.
+    private boolean hoverExplainsBiomePick() {
+        return currentType.drawsPickNoise() || currentType == RenderType.HEIGHT;
+    }
+
     private String previewedRegion() {
         return currentType == RenderType.REGION_PREVIEW ? previewRegionKey : null;
     }

core/src/main/java/com/volmit/iris/core/gui/MapHoverCard.java

@@ -18,258 +18,466 @@
 
 package com.volmit.iris.core.gui;
 
+import com.volmit.iris.core.gui.MapHoverProbe.PickStep;
+import com.volmit.iris.core.gui.NoisePickSpread.Band;
 import com.volmit.iris.core.gui.components.MapLabels;
 import com.volmit.iris.core.gui.components.RenderType;
 import com.volmit.iris.core.loader.IrisRegistrant;
-import com.volmit.iris.engine.HybridBiomeSelector;
 import com.volmit.iris.engine.object.IrisBiome;
 
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.FontMetrics;
 import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.Shape;
+import java.awt.geom.RoundRectangle2D;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Locale;
 
 /**
- * The card that follows the cursor: what the drawn map shows there at once, and the rest once probed, in titled
- * sections of labelled values.
+ * The card that follows the cursor, laid out like IntelliJ's documentation popup: the biome as the title, the steps
+ * that picked it as a small tree, and with Shift the terrain, location and pack files below.
  */
-record MapHoverCard(String title, String subtitle, List<Section> sections, String footer) {
+record MapHoverCard(Header header, String subtitle, String pathTitle, List<PickStep> path, boolean showsBands,
+                    List<Group> groups, List<Hint> hints) {
+    private static final int MINIMUM_CONTENT_WIDTH = 260;
     private static final int PADDING = 12;
-    private static final int SUBTITLE_GAP = 2;
-    private static final int SECTION_GAP = 10;
-    private static final int SECTION_TITLE_GAP = 4;
+    private static final int HEADER_TOP = 10;
+    private static final int HEADER_ICON_SIZE = 14;
+    private static final int NODE_ICON_SIZE = 12;
+    private static final int ICON_GAP = 8;
+    private static final int KIND_GAP = 16;
+    private static final int GROUP_GAP = 8;
+    private static final int GROUP_TITLE_GAP = 4;
+    private static final int NODE_HEIGHT = 24;
+    private static final int NODE_INDENT = 18;
+    private static final int CHIP_GAP = 16;
+    private static final int CHIP_PADDING_X = 5;
+    private static final int CHIP_PADDING_Y = 1;
+    private static final int BAND_HEIGHT = 4;
+    private static final int BAND_GAP = 6;
+    private static final int MARKER_WIDTH = 2;
+    private static final int MARKER_HEIGHT = 10;
     private static final int COLUMN_GAP = 14;
-    private static final int ROW_GAP = 2;
+    private static final int ROW_GAP = 3;
+    private static final int BOTTOM_PADDING = 10;
+    private static final int FOOTER_PADDING_Y = 7;
+    private static final int KEY_PADDING_X = 4;
+    private static final int KEY_GAP = 4;
+    private static final int HINT_GAP = 14;
+    private static final Color ICON_EDGE = new ThemeColor(new Color(0, 0, 0, 38), new Color(255, 255, 255, 38));
+    private static final Color MARKER_EDGE = new Color(0, 0, 0, 200);
 
     /**
      * @param subject  the biome, or region in the region view, the drawn tile shows; null while that tile is drawing
+     * @param region   the region the drawn tile shows
      * @param details  the probed facts about the spot, or null until they arrive
-     * @param detailed whether Shift is held, which adds the pack files
+     * @param detailed whether Shift is held, which trades the noise bands for terrain, location and pack files
      */
     static MapHoverCard of(MapLabels.Label subject, MapLabels.Label region, MapHoverProbe.Details details,
                            RenderType type, boolean detailed, double worldX, double worldZ) {
-        List<Section> sections = new ArrayList<>();
-        if (details != null) {
-            sections.add(terrainSection(details, type));
-            addPickSection(sections, details);
-        }
-        sections.add(locationSection(worldX, worldZ, detailed));
+        List<PickStep> path = details == null ? List.of() : details.pickPath();
+        IrisBiome biome = cardBiome(subject, details, type);
+        List<Group> groups = new ArrayList<>();
         if (detailed) {
-            addFilesSection(sections, subject, region);
+            addTerrainGroup(groups, details, type);
+            groups.add(locationGroup(worldX, worldZ));
+            addFilesGroup(groups, biome, details != null ? details.region() : region == null ? null : region.subject());
         }
-        return new MapHoverCard(title(subject, details), subtitle(region, details, type), sections,
-                detailed ? null : "Shift for pack files · H highlights");
+        return new MapHoverCard(header(subject, biome, type, path), subtitle(details), pathTitle(path), path, !detailed,
+                groups, hints(type, detailed));
     }
 
     /**
      * Draws the card with its top left corner as close to the given point as fits inside the bounds.
      */
     void paint(Graphics2D canvas, int anchorX, int anchorY, int boundsWidth, int boundsHeight) {
+        Graphics2D card = (Graphics2D) canvas.create();
+        card.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+        card.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
         int padding = StudioTheme.scale(PADDING);
-        int labelWidth = labelColumnWidth(canvas);
-        int width = Math.max(headerWidth(canvas), labelWidth + StudioTheme.scale(COLUMN_GAP) + valueColumnWidth(canvas)) + padding * 2;
-        int height = contentHeight(canvas) + padding * 2;
+        int contentWidth = contentWidth(card);
+        int width = contentWidth + padding * 2;
+        int footerHeight = footerHeight(card);
+        int height = StudioTheme.scale(HEADER_TOP) + headerHeight(card) + pathHeight(card) + groupsHeight(card)
+                + StudioTheme.scale(BOTTOM_PADDING) + footerHeight;
         int x = Math.max(padding, Math.min(boundsWidth - width - padding, anchorX));
         int y = Math.max(padding, Math.min(boundsHeight - height - padding, anchorY));
-        StudioOverlay.drawCard(canvas, x, y, width, height);
+        StudioOverlay.drawCard(card, x, y, width, height, footerHeight);
 
         int left = x + padding;
-        int top = y + padding;
-        top = drawLine(canvas, title, StudioTheme.boldFont(), StudioTheme.TEXT, left, top);
-        if (subtitle != null) {
-            top = drawLine(canvas, subtitle, StudioTheme.smallFont(), StudioTheme.SECONDARY_TEXT, left,
-                    top + StudioTheme.scale(SUBTITLE_GAP));
-        }
-        for (Section section : sections) {
-            top += StudioTheme.scale(SECTION_GAP);
-            canvas.setColor(StudioTheme.OVERLAY_BORDER);
-            canvas.fillRect(left, top, width - padding * 2, 1);
-            top += StudioTheme.scale(SECTION_GAP) / 2;
-            top = drawLine(canvas, section.title().toUpperCase(Locale.ROOT), StudioTheme.sectionFont(), StudioTheme.MUTED_TEXT,
-                    left, top) + StudioTheme.scale(SECTION_TITLE_GAP);
-            for (Row row : section.rows()) {
-                drawLine(canvas, row.label(), StudioTheme.font(), StudioTheme.SECONDARY_TEXT, left, top);
-                top = drawLine(canvas, row.value(), StudioTheme.font(), StudioTheme.TEXT,
-                        left + labelWidth + StudioTheme.scale(COLUMN_GAP), top) + StudioTheme.scale(ROW_GAP);
-            }
-        }
-        if (footer != null) {
-            drawLine(canvas, footer, StudioTheme.smallFont(), StudioTheme.MUTED_TEXT, left, top + StudioTheme.scale(SECTION_GAP));
-        }
+        int top = y + StudioTheme.scale(HEADER_TOP);
+        top = drawHeader(card, left, top, contentWidth);
+        top = drawPath(card, left, top, contentWidth);
+        drawGroups(card, left, top);
+        drawFooter(card, left, y + height - footerHeight);
+        card.dispose();
     }
 
-    private int labelColumnWidth(Graphics2D canvas) {
-        FontMetrics metrics = canvas.getFontMetrics(StudioTheme.font());
-        return sections.stream().flatMap(section -> section.rows().stream())
-                .mapToInt(row -> metrics.stringWidth(row.label())).max().orElse(0);
+    private int contentWidth(Graphics2D canvas) {
+        int width = Math.max(headerWidth(canvas), pathWidth(canvas));
+        width = Math.max(width, groupsWidth(canvas));
+        width = Math.max(width, footerWidth(canvas));
+        return Math.max(StudioTheme.scale(MINIMUM_CONTENT_WIDTH), width);
     }
 
-    private int valueColumnWidth(Graphics2D canvas) {
-        FontMetrics metrics = canvas.getFontMetrics(StudioTheme.font());
-        return sections.stream().flatMap(section -> section.rows().stream())
-                .mapToInt(row -> metrics.stringWidth(row.value())).max().orElse(0);
+    // Header: the biome's colour, its name in bold with its kind on the right, and the ground's height below.
+    private int headerTextOffset() {
+        return header.color() == null ? 0 : StudioTheme.scale(HEADER_ICON_SIZE + ICON_GAP);
     }
 
     private int headerWidth(Graphics2D canvas) {
-        int width = canvas.getFontMetrics(StudioTheme.boldFont()).stringWidth(title);
-        FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
-        if (subtitle != null) {
-            width = Math.max(width, small.stringWidth(subtitle));
+        int width = headerTextOffset() + canvas.getFontMetrics(StudioTheme.boldFont()).stringWidth(header.name());
+        if (header.kind() != null) {
+            width += StudioTheme.scale(KIND_GAP) + canvas.getFontMetrics(StudioTheme.smallFont()).stringWidth(header.kind());
         }
-        if (footer != null) {
-            width = Math.max(width, small.stringWidth(footer));
+        if (subtitle != null) {
+            width = Math.max(width, headerTextOffset() + canvas.getFontMetrics(StudioTheme.smallFont()).stringWidth(subtitle));
         }
         return width;
     }
 
-    private int contentHeight(Graphics2D canvas) {
-        int small = canvas.getFontMetrics(StudioTheme.smallFont()).getHeight();
-        int row = canvas.getFontMetrics(StudioTheme.font()).getHeight() + StudioTheme.scale(ROW_GAP);
-        int sectionTitle = canvas.getFontMetrics(StudioTheme.sectionFont()).getHeight() + StudioTheme.scale(SECTION_TITLE_GAP);
+    private int headerHeight(Graphics2D canvas) {
         int height = canvas.getFontMetrics(StudioTheme.boldFont()).getHeight();
         if (subtitle != null) {
-            height += StudioTheme.scale(SUBTITLE_GAP) + small;
-        }
-        for (Section section : sections) {
-            height += StudioTheme.scale(SECTION_GAP) + StudioTheme.scale(SECTION_GAP) / 2 + sectionTitle + section.rows().size() * row;
-        }
-        if (footer != null) {
-            height += StudioTheme.scale(SECTION_GAP) + small;
+            height += canvas.getFontMetrics(StudioTheme.smallFont()).getHeight();
         }
         return height;
     }
 
-    private static int drawLine(Graphics2D canvas, String text, Font font, Color color, int left, int top) {
-        canvas.setFont(font);
-        canvas.setColor(color);
-        FontMetrics metrics = canvas.getFontMetrics();
-        canvas.drawString(text, left, top + metrics.getAscent());
-        return top + metrics.getHeight();
+    private int drawHeader(Graphics2D canvas, int left, int top, int contentWidth) {
+        FontMetrics bold = canvas.getFontMetrics(StudioTheme.boldFont());
+        if (header.color() != null) {
+            int iconSize = StudioTheme.scale(HEADER_ICON_SIZE);
+            drawIcon(canvas, header.color(), left, top + (bold.getHeight() - iconSize) / 2, iconSize);
+        }
+        int textLeft = left + headerTextOffset();
+        int baseline = top + bold.getAscent();
+        drawText(canvas, header.name(), StudioTheme.boldFont(), StudioTheme.TEXT, textLeft, baseline);
+        if (header.kind() != null) {
+            FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
+            drawText(canvas, header.kind(), StudioTheme.smallFont(), StudioTheme.MUTED_TEXT,
+                    left + contentWidth - small.stringWidth(header.kind()), baseline);
+        }
+        top += bold.getHeight();
+        if (subtitle != null) {
+            FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
+            drawText(canvas, subtitle, StudioTheme.smallFont(), StudioTheme.SECONDARY_TEXT, textLeft, top + small.getAscent());
+            top += small.getHeight();
+        }
+        return top;
     }
 
-    private static String title(MapLabels.Label subject, MapHoverProbe.Details details) {
-        if (subject != null) {
-            return subject.name();
+    // Path: one indented row per step, its value as a chip on the right and, without Shift, the noise bands below it.
+    private int pathWidth(Graphics2D canvas) {
+        int width = 0;
+        for (int level = 0; level < path.size(); level++) {
+            PickStep step = path.get(level);
+            int row = nodeTextLeft(level) + canvas.getFontMetrics(StudioTheme.font()).stringWidth(step.picked().name() + " ")
+                    + canvas.getFontMetrics(StudioTheme.smallFont()).stringWidth(step.reason());
+            if (step.value() != null) {
+                row += StudioTheme.scale(CHIP_GAP) + chipWidth(canvas, step.value());
+            }
+            width = Math.max(width, row);
         }
-        if (details != null && details.surfaceBiome() != null) {
-            return details.surfaceBiome().getName();
-        }
-        return "Drawing…";
+        return width;
     }
 
-    // The region view's title already is the region, so only the kind of ground is left to say.
-    private static String subtitle(MapLabels.Label region, MapHoverProbe.Details details, RenderType type) {
-        List<String> parts = new ArrayList<>();
-        if (type != RenderType.REGION) {
-            String regionName = region != null ? region.name() : details != null ? details.region().getName() : null;
-            if (regionName != null) {
-                parts.add(regionName + " region");
+    private int pathHeight(Graphics2D canvas) {
+        if (path.isEmpty()) {
+            return 0;
+        }
+        int height = groupTitleHeight(canvas);
+        for (PickStep step : path) {
+            height += nodeHeight(step);
+        }
+        return height;
+    }
+
+    private int nodeHeight(PickStep step) {
+        int height = StudioTheme.scale(NODE_HEIGHT);
+        return showsBands && step.showsBands() ? height + StudioTheme.scale(BAND_HEIGHT + BAND_GAP) : height;
+    }
+
+    private static int nodeTextLeft(int level) {
+        return StudioTheme.scale(level * NODE_INDENT + NODE_ICON_SIZE + ICON_GAP);
+    }
+
+    private int drawPath(Graphics2D canvas, int left, int top, int contentWidth) {
+        if (path.isEmpty()) {
+            return top;
+        }
+        top = drawGroupTitle(canvas, pathTitle, left, top);
+        for (int level = 0; level < path.size(); level++) {
+            PickStep step = path.get(level);
+            drawNode(canvas, step, left, top, level, contentWidth);
+            if (showsBands && step.showsBands()) {
+                int bandsLeft = left + nodeTextLeft(level);
+                drawBands(canvas, step, bandsLeft, top + StudioTheme.scale(NODE_HEIGHT), left + contentWidth - bandsLeft);
+            }
+            top += nodeHeight(step);
+        }
+        return top;
+    }
+
+    private void drawNode(Graphics2D canvas, PickStep step, int left, int top, int level, int contentWidth) {
+        int rowHeight = StudioTheme.scale(NODE_HEIGHT);
+        int iconSize = StudioTheme.scale(NODE_ICON_SIZE);
+        drawIcon(canvas, step.picked().color(), left + StudioTheme.scale(level * NODE_INDENT), top + (rowHeight - iconSize) / 2,
+                iconSize);
+        FontMetrics regular = canvas.getFontMetrics(StudioTheme.font());
+        int baseline = top + (rowHeight - regular.getHeight()) / 2 + regular.getAscent();
+        int textLeft = left + nodeTextLeft(level);
+        String name = step.picked().name() + " ";
+        drawText(canvas, name, StudioTheme.font(), StudioTheme.TEXT, textLeft, baseline);
+        drawText(canvas, step.reason(), StudioTheme.smallFont(), StudioTheme.MUTED_TEXT, textLeft + regular.stringWidth(name),
+                baseline);
+        if (step.value() != null) {
+            drawChip(canvas, step.value(), left + contentWidth - chipWidth(canvas, step.value()), top, rowHeight);
+        }
+    }
+
+    // A strip with each option's band of noise in its colour, and a marker where this spot's noise falls.
+    private static void drawBands(Graphics2D canvas, PickStep step, int left, int top, int width) {
+        int height = StudioTheme.scale(BAND_HEIGHT);
+        Shape clip = canvas.getClip();
+        canvas.clip(new RoundRectangle2D.Double(left, top, width, height, height, height));
+        for (Band band : step.bands()) {
+            int from = left + (int) Math.round(band.fromNoise() * width);
+            int to = left + (int) Math.round(band.toNoise() * width);
+            canvas.setColor(new Color(band.option().color()));
+            canvas.fillRect(from, top, Math.max(1, to - from), height);
+        }
+        canvas.setClip(clip);
+        int markerWidth = StudioTheme.scale(MARKER_WIDTH);
+        int markerHeight = StudioTheme.scale(MARKER_HEIGHT);
+        int markerX = left + (int) Math.round(Math.clamp(step.noise(), 0D, 1D) * (width - markerWidth));
+        int markerY = top + (height - markerHeight) / 2;
+        canvas.setColor(MARKER_EDGE);
+        canvas.fillRect(markerX - 1, markerY - 1, markerWidth + 2, markerHeight + 2);
+        canvas.setColor(Color.WHITE);
+        canvas.fillRect(markerX, markerY, markerWidth, markerHeight);
+    }
+
+    private static Font chipFont() {
+        return StudioTheme.monospacedFont().deriveFont(StudioTheme.smallFont().getSize2D());
+    }
+
+    private static int chipWidth(Graphics2D canvas, String value) {
+        return canvas.getFontMetrics(chipFont()).stringWidth(value) + StudioTheme.scale(CHIP_PADDING_X) * 2;
+    }
+
+    // Styled like an inlay hint in IntelliJ's editor.
+    private static void drawChip(Graphics2D canvas, String value, int left, int rowTop, int rowHeight) {
+        FontMetrics metrics = canvas.getFontMetrics(chipFont());
+        int height = metrics.getHeight() + StudioTheme.scale(CHIP_PADDING_Y) * 2;
+        int top = rowTop + (rowHeight - height) / 2;
+        canvas.setColor(StudioTheme.HOVER_BACKGROUND);
+        int arc = StudioTheme.scale(8);
+        canvas.fillRoundRect(left, top, chipWidth(canvas, value), height, arc, arc);
+        drawText(canvas, value, chipFont(), StudioTheme.SECONDARY_TEXT, left + StudioTheme.scale(CHIP_PADDING_X),
+                top + StudioTheme.scale(CHIP_PADDING_Y) + metrics.getAscent());
+    }
+
+    private static void drawIcon(Graphics2D canvas, int rgb, int left, int top, int size) {
+        int arc = Math.max(2, size / 2);
+        canvas.setColor(new Color(rgb));
+        canvas.fillRoundRect(left, top, size, size, arc, arc);
+        canvas.setColor(ICON_EDGE);
+        canvas.drawRoundRect(left, top, size - 1, size - 1, arc, arc);
+    }
+
+    // Groups: sentence-case titles over rows of muted labels and values, all labels in one column.
+    private int labelColumnWidth(Graphics2D canvas) {
+        FontMetrics metrics = canvas.getFontMetrics(StudioTheme.font());
+        return groups.stream().flatMap(group -> group.rows().stream())
+                .mapToInt(row -> metrics.stringWidth(row.label())).max().orElse(0);
+    }
+
+    private int groupsWidth(Graphics2D canvas) {
+        FontMetrics metrics = canvas.getFontMetrics(StudioTheme.font());
+        int valueWidth = groups.stream().flatMap(group -> group.rows().stream())
+                .mapToInt(row -> metrics.stringWidth(row.value())).max().orElse(0);
+        return labelColumnWidth(canvas) + StudioTheme.scale(COLUMN_GAP) + valueWidth;
+    }
+
+    private int groupsHeight(Graphics2D canvas) {
+        int rowHeight = canvas.getFontMetrics(StudioTheme.font()).getHeight() + StudioTheme.scale(ROW_GAP);
+        return groups.stream().mapToInt(group -> groupTitleHeight(canvas) + group.rows().size() * rowHeight).sum();
+    }
+
+    private void drawGroups(Graphics2D canvas, int left, int top) {
+        FontMetrics regular = canvas.getFontMetrics(StudioTheme.font());
+        int valueLeft = left + labelColumnWidth(canvas) + StudioTheme.scale(COLUMN_GAP);
+        for (Group group : groups) {
+            top = drawGroupTitle(canvas, group.title(), left, top);
+            for (Row row : group.rows()) {
+                int baseline = top + regular.getAscent();
+                drawText(canvas, row.label(), StudioTheme.font(), StudioTheme.SECONDARY_TEXT, left, baseline);
+                drawText(canvas, row.value(), StudioTheme.font(), row.link() ? StudioTheme.LINK : StudioTheme.TEXT, valueLeft,
+                        baseline);
+                top += regular.getHeight() + StudioTheme.scale(ROW_GAP);
             }
         }
-        if (details != null && details.terrainKind() != null) {
-            parts.add(details.terrainKind());
-        }
-        return parts.isEmpty() ? null : String.join(" · ", parts);
     }
 
-    private static Section terrainSection(MapHoverProbe.Details details, RenderType type) {
+    private static int groupTitleHeight(Graphics2D canvas) {
+        return StudioTheme.scale(GROUP_GAP) + canvas.getFontMetrics(StudioTheme.smallFont()).getHeight()
+                + StudioTheme.scale(GROUP_TITLE_GAP);
+    }
+
+    private static int drawGroupTitle(Graphics2D canvas, String title, int left, int top) {
+        FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
+        top += StudioTheme.scale(GROUP_GAP);
+        drawText(canvas, title, StudioTheme.smallFont(), StudioTheme.MUTED_TEXT, left, top + small.getAscent());
+        return top + small.getHeight() + StudioTheme.scale(GROUP_TITLE_GAP);
+    }
+
+    // Footer: the shortcuts as key caps, each followed by what it does.
+    private int footerWidth(Graphics2D canvas) {
+        FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
+        int width = 0;
+        for (Hint hint : hints) {
+            width += keyWidth(small, hint.key()) + StudioTheme.scale(KEY_GAP) + small.stringWidth(hint.action());
+        }
+        return width + StudioTheme.scale(HINT_GAP) * Math.max(0, hints.size() - 1);
+    }
+
+    private static int footerHeight(Graphics2D canvas) {
+        return canvas.getFontMetrics(StudioTheme.smallFont()).getHeight() + StudioTheme.scale(FOOTER_PADDING_Y) * 2;
+    }
+
+    private static int keyWidth(FontMetrics small, String key) {
+        return small.stringWidth(key) + StudioTheme.scale(KEY_PADDING_X) * 2;
+    }
+
+    private void drawFooter(Graphics2D canvas, int left, int top) {
+        FontMetrics small = canvas.getFontMetrics(StudioTheme.smallFont());
+        int textTop = top + StudioTheme.scale(FOOTER_PADDING_Y);
+        int baseline = textTop + small.getAscent();
+        int arc = StudioTheme.scale(6);
+        for (Hint hint : hints) {
+            int keyWidth = keyWidth(small, hint.key());
+            canvas.setColor(StudioTheme.HOVER_BACKGROUND);
+            canvas.fillRoundRect(left, textTop, keyWidth, small.getHeight(), arc, arc);
+            drawText(canvas, hint.key(), StudioTheme.smallFont(), StudioTheme.SECONDARY_TEXT,
+                    left + StudioTheme.scale(KEY_PADDING_X), baseline);
+            left += keyWidth + StudioTheme.scale(KEY_GAP);
+            drawText(canvas, hint.action(), StudioTheme.smallFont(), StudioTheme.MUTED_TEXT, left, baseline);
+            left += small.stringWidth(hint.action()) + StudioTheme.scale(HINT_GAP);
+        }
+    }
+
+    private static void drawText(Graphics2D canvas, String text, Font font, Color color, int left, int baseline) {
+        canvas.setFont(font);
+        canvas.setColor(color);
+        canvas.drawString(text, left, baseline);
+    }
+
+    // The card is about a biome; the region view's tiles only know the region until the probe finds the biome.
+    private static IrisBiome cardBiome(MapLabels.Label subject, MapHoverProbe.Details details, RenderType type) {
+        if (subject != null && subject.subject() instanceof IrisBiome biome) {
+            return biome;
+        }
+        if (details == null) {
+            return null;
+        }
+        return type == RenderType.CAVE_LAND ? details.caveBiome() : details.surfaceBiome();
+    }
+
+    private static Header header(MapLabels.Label subject, IrisBiome biome, RenderType type, List<PickStep> path) {
+        if (biome != null) {
+            return new Header(biome.getName(), colorOf(biome, path), type == RenderType.CAVE_LAND ? "Cave biome" : "Biome");
+        }
+        if (subject != null) {
+            return new Header(subject.name(), null, subject.kind() == MapLabels.Kind.REGION ? "Region" : "Biome");
+        }
+        return new Header("Drawing…", null, null);
+    }
+
+    private static Integer colorOf(IrisBiome biome, List<PickStep> path) {
+        return path.stream()
+                .filter(step -> step.picked().key().equals(biome.getLoadKey()))
+                .reduce((first, last) -> last)
+                .map(step -> step.picked().color())
+                .orElse(null);
+    }
+
+    private static String subtitle(MapHoverProbe.Details details) {
+        if (details == null) {
+            return null;
+        }
+        return Math.round(details.height()) + " · " + heightAboveSea(details.height() - details.fluidHeight()) + " · slope "
+                + Math.round(details.slopeDegrees()) + "°";
+    }
+
+    private static String pathTitle(List<PickStep> path) {
+        return path.size() > 1 ? "Picked by" : "Region";
+    }
+
+    private static void addTerrainGroup(List<Group> groups, MapHoverProbe.Details details, RenderType type) {
+        if (details == null) {
+            return;
+        }
         List<Row> rows = new ArrayList<>();
-        long height = Math.round(details.height());
-        rows.add(new Row("Height", height + " · " + heightAboveSea(details.height() - details.fluidHeight())));
-        rows.add(new Row("Slope", Math.round(details.slopeDegrees()) + "°"));
         IrisBiome surface = details.surfaceBiome();
         IrisBiome cave = details.caveBiome();
         if (type == RenderType.CAVE_LAND && surface != null) {
-            rows.add(new Row("Surface biome", surface.getName()));
+            rows.add(new Row("Surface biome", surface.getName(), false));
         } else if (type != RenderType.CAVE_LAND && cave != null && cave != surface) {
-            rows.add(new Row("Cave biome", cave.getName()));
+            rows.add(new Row("Cave biome", cave.getName(), false));
         }
         if (details.vanillaBiome() != null) {
-            rows.add(new Row("Minecraft", details.vanillaBiome().replace('_', ' ')));
-        }
-        return new Section("Terrain", rows);
-    }
-
-    private static void addPickSection(List<Section> sections, MapHoverProbe.Details details) {
-        List<Row> rows = new ArrayList<>();
-        MapHoverProbe.PickNoise noise = details.pickNoise();
-        if (noise != null && noise.regionNoise() != null) {
-            rows.add(new Row("Region noise", noiseText(noise.regionNoise())));
-        }
-        if (noise != null && noise.biomeType() != null) {
-            String label = capitalize(noise.biomeType().name().toLowerCase(Locale.ROOT)) + " noise";
-            rows.add(new Row(label, biomeNoiseText(noise, details.surfaceBiome())));
-        }
-        if (details.placement() != null) {
-            rows.add(new Row("Height", placementText(details.placement())));
+            rows.add(new Row("Minecraft", details.vanillaBiome().replace('_', ' '), false));
         }
         if (!rows.isEmpty()) {
-            sections.add(new Section("Picked by", rows));
+            groups.add(new Group("Terrain", rows));
         }
     }
 
-    private static String biomeNoiseText(MapHoverProbe.PickNoise noise, IrisBiome surface) {
-        String value = noiseText(noise.biomeNoise());
-        IrisBiome picked = noise.noisePick();
-        if (picked == null) {
-            return value;
-        }
-        if (surface == null || picked.getLoadKey().equals(surface.getLoadKey())) {
-            return value + " → " + picked.getName();
-        }
-        return value + " → " + picked.getName() + ", child " + surface.getName() + " took over";
-    }
-
-    // How hybrid terrain chose the base biome; a child biome or a coast can still replace it afterwards.
-    private static String placementText(HybridBiomeSelector.Choice choice) {
-        String height = heightAboveSea(choice.placementHeight()) + " · ";
-        if (choice.fallback()) {
-            return height + "no range covers it, closest wins";
-        }
-        if (choice.rivalCount() == 0) {
-            return height + "only biome in range";
-        }
-        return height + "beat " + choice.rivalCount() + (choice.rivalCount() == 1 ? " other" : " others") + " in range";
-    }
-
-    private static Section locationSection(double worldX, double worldZ, boolean detailed) {
+    private static Group locationGroup(double worldX, double worldZ) {
         int blockX = MapCanvas.floorWorldCoordinate(worldX);
         int blockZ = MapCanvas.floorWorldCoordinate(worldZ);
-        List<Row> rows = new ArrayList<>();
-        rows.add(new Row("Block", blockX + ", " + blockZ));
-        rows.add(new Row("Chunk", (blockX >> 4) + ", " + (blockZ >> 4)));
-        if (detailed) {
-            rows.add(new Row("Region file", "r." + (blockX >> 9) + "." + (blockZ >> 9) + ".mca"));
-        }
-        return new Section("Location", rows);
+        return new Group("Location", List.of(
+                new Row("Block", blockX + ", " + blockZ, false),
+                new Row("Chunk", (blockX >> 4) + ", " + (blockZ >> 4), false),
+                new Row("Region file", "r." + (blockX >> 9) + "." + (blockZ >> 9) + ".mca", false)));
     }
 
-    private static void addFilesSection(List<Section> sections, MapLabels.Label subject, MapLabels.Label region) {
+    private static void addFilesGroup(List<Group> groups, IrisBiome biome, Object region) {
         List<Row> rows = new ArrayList<>();
-        addPackFile(rows, subject);
-        if (subject != null && subject.kind() != MapLabels.Kind.REGION) {
-            addPackFile(rows, region);
+        if (biome != null) {
+            rows.add(new Row("Biome", packPath(biome), true));
+        }
+        if (region instanceof IrisRegistrant registrant) {
+            rows.add(new Row("Region", packPath(registrant), true));
         }
         if (!rows.isEmpty()) {
-            sections.add(new Section("Pack files", rows));
+            groups.add(new Group("Files", rows));
         }
     }
 
     // The key is the path under the type's folder, so folder, key and extension give the file within the pack.
-    private static void addPackFile(List<Row> rows, MapLabels.Label label) {
-        if (label == null || !(label.subject() instanceof IrisRegistrant registrant)) {
-            return;
-        }
-        String kind = label.kind() == MapLabels.Kind.REGION ? "Region" : "Biome";
+    private static String packPath(IrisRegistrant registrant) {
         File file = registrant.getLoadFile();
         String fileName = file == null ? "" : file.getName();
         int extensionStart = fileName.lastIndexOf('.');
         String extension = extensionStart < 0 ? "" : fileName.substring(extensionStart);
-        rows.add(new Row(kind, registrant.getFolderName() + "/" + label.key() + extension));
+        return registrant.getFolderName() + "/" + registrant.getLoadKey() + extension;
+    }
+
+    private static List<Hint> hints(RenderType type, boolean detailed) {
+        List<Hint> hints = new ArrayList<>();
+        if (!detailed) {
+            hints.add(new Hint("Shift", "More"));
+        }
+        hints.add(new Hint("H", "Highlight"));
+        if (type != RenderType.CONTINENT) {
+            hints.add(new Hint("Alt+Click", "Open file"));
+        }
+        return hints;
     }
 
     private static String heightAboveSea(double height) {
@@ -277,17 +485,19 @@ record MapHoverCard(String title, String subtitle, List<Section> sections, Strin
         return rounded < 0 ? -rounded + " below sea" : rounded + " above sea";
     }
 
-    private static String noiseText(double noise) {
-        return String.format(Locale.ROOT, "%.3f", noise);
+    /**
+     * @param color the biome's map colour, or null when no step of the path tells it
+     * @param kind  what the title names, like "Biome", or null while drawing
+     */
+    record Header(String name, Integer color, String kind) {
     }
 
-    private static String capitalize(String text) {
-        return Character.toUpperCase(text.charAt(0)) + text.substring(1);
+    record Group(String title, List<Row> rows) {
     }
 
-    record Section(String title, List<Row> rows) {
+    record Row(String label, String value, boolean link) {
     }
 
-    record Row(String label, String value) {
+    record Hint(String key, String action) {
     }
 }

core/src/main/java/com/volmit/iris/core/gui/MapHoverProbe.java

@@ -18,6 +18,8 @@
 
 package com.volmit.iris.core.gui;
 
+import com.volmit.iris.core.gui.NoisePickSpread.Band;
+import com.volmit.iris.core.gui.NoisePickSpread.Option;
 import com.volmit.iris.engine.HybridBiomeSelector;
 import com.volmit.iris.engine.IrisComplex;
 import com.volmit.iris.engine.framework.Engine;
@@ -27,6 +29,8 @@ import com.volmit.iris.engine.object.IrisDimension;
 import com.volmit.iris.engine.object.IrisRegion;
 import org.bukkit.block.Biome;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Locale;
 
 /**
@@ -41,61 +45,108 @@ final class MapHoverProbe {
 
     /**
      * @param previewRegionKey the region the region preview treats every spot as part of, or null for the real world
-     * @param explainPicks     also look up the noise values that picked the region and biome, for the region view
+     * @param explainBiomePick whether the card shows the surface biome, so the whole way to it is worth looking up;
+     *                         otherwise only how the region was picked
      */
-    static Details sample(Engine engine, double worldX, double worldZ, String previewRegionKey, boolean explainPicks) {
+    static Details sample(Engine engine, double worldX, double worldZ, String previewRegionKey, boolean explainBiomePick) {
         IrisComplex complex = engine.getComplex();
         IrisRegion previewRegion = previewRegionKey == null ? null : engine.getData().getRegionLoader().load(previewRegionKey);
         IrisRegion region = previewRegion != null ? previewRegion : complex.getRegionStream().get(worldX, worldZ);
-        IrisBiome surfaceBiome = previewRegion != null
-                ? complex.surfaceBiomeAsIfIn(previewRegion, worldX, worldZ)
-                : complex.getBaseBiomeStream().get(worldX, worldZ);
-        IrisBiome caveBiome = complex.getCaveBiomeStream().get(worldX, worldZ);
-        InferredType terrainKind = complex.getBridgeStream().get(worldX, worldZ);
+        IrisComplex.BiomePick surfacePick = complex.surfacePickAsIfIn(region, worldX, worldZ);
         Biome vanillaBiome = complex.getTrueBiomeDerivativeStream().get(worldX, worldZ);
-        double height = complex.getHeightStream().getDouble(worldX, worldZ);
         double slope = complex.getSlopeStream().getDouble(worldX, worldZ);
         IrisDimension dimension = engine.getDimension();
         return new Details(
                 worldX,
                 worldZ,
-                surfaceBiome,
-                caveBiome,
+                surfacePick.biome(),
+                complex.getCaveBiomeStream().get(worldX, worldZ),
                 region,
-                terrainKindName(surfaceBiome, terrainKind),
                 vanillaBiome == null ? null : vanillaBiome.getKey().getKey(),
-                height,
+                complex.getHeightStream().getDouble(worldX, worldZ),
                 dimension == null ? 0D : dimension.getFluidHeight(),
                 Math.toDegrees(Math.atan(slope / SLOPE_STREAM_RANGE_BLOCKS)),
-                complex.explainHybridChoice(region, worldX, worldZ),
-                explainPicks ? pickNoise(complex, region, previewRegion, worldX, worldZ) : null
+                pickPath(engine, region, previewRegion != null, explainBiomePick ? surfacePick : null, worldX, worldZ)
         );
     }
 
-    // HYBRID terrain picks biomes by height, which the placement line already tells, so only the region noise is left.
-    // The preview shows surface biomes, which the height can move to another biome list; the real map shows base biomes.
-    private static PickNoise pickNoise(IrisComplex complex, IrisRegion region, IrisRegion previewRegion, double x, double z) {
-        Double regionNoise = previewRegion == null ? complex.getRegionStyleStream().get(x, z) : null;
-        if (complex.isHybridTerrain() || region == null) {
-            return new PickNoise(regionNoise, null, Double.NaN, null);
+    // The region preview chose the region itself; the real map picks it by the region noise.
+    private static List<PickStep> pickPath(Engine engine, IrisRegion region, boolean previewed,
+                                           IrisComplex.BiomePick surfacePick, double x, double z) {
+        List<PickStep> path = new ArrayList<>();
+        path.add(previewed ? previewedRegionStep(engine, region) : regionStep(engine, region, x, z));
+        if (surfacePick == null || surfacePick.type() == null || engine.getComplex().getFocusBiome() != null) {
+            return path;
         }
-        InferredType biomeType = previewRegion != null
-                ? complex.surfacePickAsIfIn(region, x, z).type()
-                : complex.getBridgeStream().get(x, z);
-        return new PickNoise(regionNoise, biomeType, complex.biomePickNoise(region, biomeType, x, z),
-                complex.biomePickedByNoise(region, biomeType, x, z));
+        PickStep biomeStep = engine.getComplex().isHybridTerrain()
+                ? heightStep(engine, region, surfacePick.type(), x, z)
+                : noiseStep(engine, region, surfacePick.type(), x, z);
+        if (biomeStep == null) {
+            return path;
+        }
+        path.add(biomeStep);
+        if (!biomeStep.picked().key().equals(surfacePick.biome().getLoadKey())) {
+            path.add(new PickStep(PickMeasuring.biomeOption(engine, surfacePick.biome()), "child", null, List.of(), Double.NaN));
+        }
+        return path;
     }
 
-    // A shore biome sits on land the continent stream calls land or sea, so the biome's own type says it best.
-    private static String terrainKindName(IrisBiome surfaceBiome, InferredType continentKind) {
-        InferredType kind = surfaceBiome != null && surfaceBiome.getInferredType() != null
-                ? surfaceBiome.getInferredType()
-                : continentKind;
-        if (kind == null) {
+    private static PickStep regionStep(Engine engine, IrisRegion region, double x, double z) {
+        IrisComplex complex = engine.getComplex();
+        double noise = complex.getRegionStyleStream().get(x, z);
+        List<Option> regions = complex.noisePickedRegions().stream()
+                .map(candidate -> PickMeasuring.regionOption(engine, candidate))
+                .toList();
+        return new PickStep(PickMeasuring.regionOption(engine, region), "region", noiseText(noise),
+                NoisePickSpread.splitNoise(regions, complex.isLegacyRarity()), noise);
+    }
+
+    private static PickStep previewedRegionStep(Engine engine, IrisRegion region) {
+        return new PickStep(PickMeasuring.regionOption(engine, region), "previewed", null, List.of(), Double.NaN);
+    }
+
+    private static PickStep noiseStep(Engine engine, IrisRegion region, InferredType type, double x, double z) {
+        IrisComplex complex = engine.getComplex();
+        double noise = complex.biomePickNoise(region, type, x, z);
+        List<Option> biomes = complex.noisePickedBiomes(region, type).stream()
+                .map(biome -> PickMeasuring.biomeOption(engine, biome))
+                .toList();
+        IrisBiome picked = complex.biomePickedByNoise(region, type, x, z);
+        return new PickStep(PickMeasuring.biomeOption(engine, picked), typeName(type), noiseText(noise),
+                NoisePickSpread.splitNoise(biomes, complex.isLegacyRarity()), noise);
+    }
+
+    // HYBRID terrain picks by the height a spot is placed at, and only competes where biome ranges share that height.
+    private static PickStep heightStep(Engine engine, IrisRegion region, InferredType type, double x, double z) {
+        HybridBiomeSelector.Choice choice = engine.getComplex().explainHybridChoice(region, type, x, z);
+        if (choice == null) {
             return null;
         }
-        String name = kind.name().toLowerCase(Locale.ROOT);
-        return Character.toUpperCase(name.charAt(0)) + name.substring(1);
+        return new PickStep(PickMeasuring.biomeOption(engine, choice.biome()), typeName(type) + ", " + competitionText(choice),
+                signedHeightText(choice.placementHeight()), List.of(), Double.NaN);
+    }
+
+    private static String competitionText(HybridBiomeSelector.Choice choice) {
+        if (choice.fallback()) {
+            return "nearest range";
+        }
+        if (choice.rivalCount() == 0) {
+            return "only fit";
+        }
+        return "beat " + choice.rivalCount();
+    }
+
+    private static String typeName(InferredType type) {
+        return type.name().toLowerCase(Locale.ROOT);
+    }
+
+    private static String noiseText(double noise) {
+        return String.format(Locale.ROOT, "%.3f", noise);
+    }
+
+    private static String signedHeightText(double heightAboveSea) {
+        long rounded = Math.round(heightAboveSea);
+        return rounded < 0 ? "−" + -rounded : "+" + rounded;
     }
 
     record Details(
@@ -104,21 +155,24 @@ final class MapHoverProbe {
             IrisBiome surfaceBiome,
             IrisBiome caveBiome,
             IrisRegion region,
-            String terrainKind,
             String vanillaBiome,
             double height,
             double fluidHeight,
             double slopeDegrees,
-            HybridBiomeSelector.Choice placement,
-            PickNoise pickNoise
+            List<PickStep> pickPath
     ) {
     }
 
     /**
-     * @param regionNoise the region noise value, or null when the region preview chose the region
-     * @param biomeType   the biome list the biome noise picked from, or null when no noise picked the biome
-     * @param noisePick   the biome the noise picked, which a child biome can still replace
+     * One step on the way to the spot's biome, starting with its region.
+     *
+     * @param reason what picked it: its kind, the biome list the noise picked from, or "child"
+     * @param value  the noise value or placement height that picked it, or null
+     * @param bands  the noise bands of all the options the noise picked from, empty when no noise picked it
      */
-    record PickNoise(Double regionNoise, InferredType biomeType, double biomeNoise, IrisBiome noisePick) {
+    record PickStep(Option picked, String reason, String value, List<Band> bands, double noise) {
+        boolean showsBands() {
+            return !bands.isEmpty();
+        }
     }
 }

core/src/main/java/com/volmit/iris/core/gui/NoisePickSpread.java

@@ -48,7 +48,14 @@ final class NoisePickSpread {
      * @param legacyRarity whether the dimension splits the noise the legacy way
      */
     static NoisePickSpread of(String title, List<Option> options, boolean legacyRarity) {
-        return new NoisePickSpread(title, legacyRarity ? legacyBands(options) : bands(options));
+        return new NoisePickSpread(title, splitNoise(options, legacyRarity));
+    }
+
+    /**
+     * The band of noise each option gets, in the order the noise meets them.
+     */
+    static List<Band> splitNoise(List<Option> options, boolean legacyRarity) {
+        return legacyRarity ? legacyBands(options) : bands(options);
     }
 
     void add(double noise) {

core/src/main/java/com/volmit/iris/core/gui/PickMeasuring.java

@@ -58,6 +58,11 @@ final class PickMeasuring {
         return new Option(region.getLoadKey(), region.getName(), regionColor(engine, region), region.getRarity());
     }
 
+    static Option biomeOption(Engine engine, IrisBiome biome) {
+        return new Option(biome.getLoadKey(), biome.getName(), biome.getColor(engine, RenderType.BIOME).getRGB() & 0xFFFFFF,
+                biome.getRarity());
+    }
+
     static int regionColor(Engine engine, IrisRegion region) {
         return region.getColor(engine.getComplex(), RenderType.REGION).getRGB() & 0xFFFFFF;
     }
@@ -161,11 +166,6 @@ final class PickMeasuring {
         return Character.toUpperCase(name.charAt(0)) + name.substring(1);
     }
 
-    private static Option biomeOption(Engine engine, IrisBiome biome) {
-        return new Option(biome.getLoadKey(), biome.getName(), biome.getColor(engine, RenderType.BIOME).getRGB() & 0xFFFFFF,
-                biome.getRarity());
-    }
-
     @FunctionalInterface
     interface SampleVisitor {
         void visit(double x, double z);

core/src/main/java/com/volmit/iris/core/gui/StudioOverlay.java

@@ -18,26 +18,47 @@
 
 package com.volmit.iris.core.gui;
 
+import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;
+import java.awt.Shape;
 import java.awt.geom.RoundRectangle2D;
 
 /**
  * Draws the floating cards (legends, hover details, hints) on top of a map, styled like IntelliJ's popups.
  */
 final class StudioOverlay {
+    private static final Color FOOTER_BACKGROUND = new ThemeColor(0xF7F8FA, 0x27292C);
+
     private StudioOverlay() {
     }
 
     static void drawCard(Graphics2D canvas, int x, int y, int width, int height) {
-        Object antialiasing = canvas.getRenderingHint(RenderingHints.KEY_ANTIALIASING);
-        canvas.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
-        RoundRectangle2D card = new RoundRectangle2D.Double(x + 0.5D, y + 0.5D, width - 1D, height - 1D,
+        drawCard(canvas, x, y, width, height, 0);
+    }
+
+    /**
+     * Draws a card whose bottom {@code footerHeight} pixels are a darker bar, like the shortcut bar of IntelliJ's popups.
+     */
+    static void drawCard(Graphics2D canvas, int x, int y, int width, int height, int footerHeight) {
+        Graphics2D card = (Graphics2D) canvas.create();
+        card.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+        RoundRectangle2D outline = new RoundRectangle2D.Double(x + 0.5D, y + 0.5D, width - 1D, height - 1D,
                 StudioTheme.scale(StudioTheme.OVERLAY_ARC), StudioTheme.scale(StudioTheme.OVERLAY_ARC));
-        canvas.setColor(StudioTheme.OVERLAY_BACKGROUND);
-        canvas.fill(card);
-        canvas.setColor(StudioTheme.OVERLAY_BORDER);
-        canvas.draw(card);
-        canvas.setRenderingHint(RenderingHints.KEY_ANTIALIASING, antialiasing);
+        card.setColor(StudioTheme.OVERLAY_BACKGROUND);
+        card.fill(outline);
+        if (footerHeight > 0) {
+            int footerTop = y + height - footerHeight;
+            Shape cardClip = card.getClip();
+            card.clip(outline);
+            card.setColor(FOOTER_BACKGROUND);
+            card.fillRect(x, footerTop, width, footerHeight);
+            card.setColor(StudioTheme.OVERLAY_BORDER);
+            card.fillRect(x, footerTop, width, 1);
+            card.setClip(cardClip);
+        }
+        card.setColor(StudioTheme.OVERLAY_BORDER);
+        card.draw(outline);
+        card.dispose();
     }
 }

core/src/main/java/com/volmit/iris/engine/IrisComplex.java

@@ -328,14 +328,14 @@ public class IrisComplex implements DataProvider {
     }
 
     /**
-     * Why HYBRID terrain gives a spot its base biome when the spot belongs to the given region; null for BIOME terrain.
+     * Why HYBRID terrain picks a biome from the region's biomes of this type at a spot; null for BIOME terrain.
      */
-    public HybridBiomeSelector.Choice explainHybridChoice(IrisRegion region, double x, double z) {
+    public HybridBiomeSelector.Choice explainHybridChoice(IrisRegion region, InferredType type, double x, double z) {
         if (!hybridTerrain || focusBiome != null) {
             return null;
         }
 
-        return chooseHybridBiome(region, bridgeStream.get(x, z), x, z);
+        return chooseHybridBiome(region, type, x, z);
     }
 
     private IrisBiome biomeInRegion(IrisRegion region, InferredType type, double x, double z) {