Adding Circle tool - reusing Rectangle implementation for now

js/drawingtools/Circle.js

@@ -0,0 +1,62 @@
+/*
+ * @provide pskl.drawingtools.Circle
+ *
+ * @require pskl.utils
+ */
+(function() {
+	var ns = $.namespace("pskl.drawingtools");
+
+	ns.Circle = function() {
+		this.toolId = "tool-circle"
+		
+		// Circle's first point coordinates (set in applyToolAt)
+		this.startCol = null;
+		this.startRow = null;
+	};
+
+	pskl.utils.inherit(ns.Circle, ns.BaseTool);
+	
+	/**
+	 * @override
+	 */
+	ns.Circle.prototype.applyToolAt = function(col, row, color, frame, overlay) {
+		this.startCol = col;
+		this.startRow = row;
+		
+		// Drawing the first point of the rectangle in the fake overlay canvas:
+		overlay.setPixel(col, row, color);
+	};
+
+	ns.Circle.prototype.moveToolAt = function(col, row, color, frame, overlay) {
+		overlay.clear();
+
+		// When the user moussemove (before releasing), we dynamically compute the 
+		// pixel to draw the line and draw this line in the overlay :
+		var strokePoints = pskl.PixelUtils.getBoundRectanglePixels(this.startCol, this.startRow, col, row);
+		if(color == Constants.TRANSPARENT_COLOR) {
+			color = Constants.SELECTION_TRANSPARENT_COLOR;
+		}
+
+		// Drawing current stroke:
+		for(var i = 0; i< strokePoints.length; i++) {
+			overlay.setPixel(strokePoints[i].col, strokePoints[i].row, color);
+		}
+	};
+
+	/**
+	 * @override
+	 */
+	ns.Circle.prototype.releaseToolAt = function(col, row, color, frame, overlay) {		
+		overlay.clear();
+		// If the stroke tool is released outside of the canvas, we cancel the stroke: 
+		if(frame.containsPixel(col, row)) {
+			var strokePoints = pskl.PixelUtils.getBoundRectanglePixels(this.startCol, this.startRow, col, row);
+			for(var i = 0; i< strokePoints.length; i++) {
+				// Change model:
+				frame.setPixel(strokePoints[i].col, strokePoints[i].row, color);
+			}
+			// The user released the tool to draw a line. We will compute the pixel coordinate, impact
+			// the model and draw them in the drawing canvas (not the fake overlay anymore)		
+		}
+	};
+})();