Added back brush with new tool system

js/tools/BrushTool.js

@@ -0,0 +1,38 @@
+class BrushTool extends Tool {
+    constructor(name, options) {
+        super(name, options);
+
+        // Selection button, brush size buttons
+        Events.on('click',"pencil-button", this.onSelect);
+        Events.on('click',"pencil-bigger-button", this.increaseSize.bind(this));
+        Events.on('click',"pencil-smaller-button", this.decreaseSize.bind(this));
+    }
+
+    onStart(mousePos) {
+        super.onStart(mousePos);
+		this.startMousePos = mousePos;
+	}
+
+	onDrag(mousePos, cursorTarget) {
+        super.onDrag(mousePos);
+
+        if (cursorTarget === undefined)
+            return;
+        //draw line to current pixel
+        if (cursorTarget.className == 'drawingCanvas' || cursorTarget.className == 'drawingCanvas') {
+            line(Math.floor(this.prevMousePos[0]/zoom),
+                Math.floor(this.prevMousePos[1]/zoom),
+                Math.floor(this.currMousePos[0]/zoom),
+                Math.floor(this.currMousePos[1]/zoom), 
+                this.currSize
+            );
+        }
+
+        currentLayer.updateLayerPreview();
+	}
+
+	onEnd(mousePos) {
+        super.onEnd(mousePos);
+		this.endMousePos = mousePos;
+	}
+}