Implement image to map

src/main/java/com/dfsek/terra/image/ImageLoader.java

@@ -0,0 +1,45 @@
+package com.dfsek.terra.image;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+
+import javax.imageio.ImageIO;
+
+public class ImageLoader {
+    private final BufferedImage image;
+    double inverseRoot2 = 0.7071067811865475;
+    public ImageLoader(File file) throws IOException {
+        image = ImageIO.read(file);
+    }
+
+
+    public int getChannel(int x, int y, Channel channel) {
+        int rgb;
+        try {
+            rgb = image.getRGB(Math.floorMod(x, image.getWidth()), Math.floorMod(y, image.getHeight()));
+        } catch(ArrayIndexOutOfBoundsException e) {
+            e.printStackTrace();
+            throw new IllegalArgumentException("Index " + x + "/" + x + "out of bounds for size " + image.getWidth() + "/" + image.getHeight());
+        }
+        switch(channel) {
+            case RED: return rgb >> 16 & 0xff;
+            case GREEN: return rgb >> 8 & 0xff;
+            case BLUE: return rgb & 0xff;
+            case ALPHA: return rgb >> 32 & 0xff;
+            default: throw new IllegalArgumentException();
+        }
+    }
+
+    public double getNoiseVal(int x, int y, Channel channel) {
+        return ((double) (getChannel(x, y, channel) - 128)/128)*inverseRoot2;
+    }
+
+    public enum Channel {
+        RED, GREEN, BLUE, ALPHA
+    }
+}