Tool plugin architecture with eraser/pen/paintbucket tools.

js/drawingtools/SimplePen.js

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+/*
+ * @provide pskl.drawingtools.SimplePen
+ *
+ * @require pskl.utils
+ */
+(function() {
+	var ns = $.namespace("pskl.drawingtools");
+
+	ns.SimplePen = function() {
+		this.toolId = "tool-pen"
+	};
+
+	pskl.utils.inherit(ns.SimplePen, ns.BaseTool);
+	
+	/**
+	 * @override
+	 */
+	ns.SimplePen.prototype.applyToolOnFrameAt = function(col, row, frame, color) {
+		var color = pskl.utils.normalizeColor(color);
+	    if (color != frame[col][row]) {
+	        frame[col][row] = color;
+	    }
+	};
+
+	/**
+	 * @override
+	 */
+	ns.SimplePen.prototype.applyToolOnCanvasAt = function(col, row, canvas, frame, color, dpi) {
+
+		this.drawPixelInCanvas(col, row, canvas, color, dpi);
+	};
+
+	/**
+	 * @override
+	 */
+	ns.SimplePen.prototype.releaseToolAt = function() {
+		// Do nothing
+		console.log('SimplePen release');
+	};
+
+})();