Implement style switching functionality. Add default, night, and high contrast styles.

script/features/draw_graph/model/EdgeContrastStyle.js

@@ -0,0 +1,43 @@
+/**
+ * New Contrast edge styles.
+ */
+
+ function ContrastCommonEdgeStyle()
+{
+  	BaseEdgeStyle.apply(this, arguments);
+
+	this.strokeStyle = '#000000';
+	this.weightText  = '#000000';
+	this.fillStyle   = '#ffffff';
+	this.textPadding = 4;
+	this.textStrokeWidth = 2;
+	this.lineDash = 0;
+	this.additionalTextColor = '#000000';
+	this.weightPosition = WeightTextCenter;
+	this.mainTextFontSize = 16;
+}
+
+ContrastCommonEdgeStyle.prototype = Object.create(BaseEdgeStyle.prototype);
+
+function ContrastSelectedEdgeStyle0()
+{
+	BaseEdgeStyle.apply(this, arguments);  
+
+	this.strokeStyle = '#000000';
+	this.weightText  = '#000000';
+	this.fillStyle   = '#ffffff';
+	this.additionalTextColor = '#000000';
+	this.lineDash = 1
+
+  	this.baseStyles.push("common");
+}
+
+ContrastSelectedEdgeStyle0.prototype = Object.create(BaseEdgeStyle.prototype);
+
+function GetContrastCommonEdgeStyle()
+{
+	return new ContrastCommonEdgeStyle();
+}
+
+var ContrastSelectedEdgeStyles      = [new ContrastSelectedEdgeStyle0(), new ContrastSelectedEdgeStyle0(), 
+	new ContrastSelectedEdgeStyle0(), new ContrastSelectedEdgeStyle0(), new ContrastSelectedEdgeStyle0()];