Index: web/client/scripts/draw.js
===================================================================
--- web/client/scripts/draw.js	(revision 6564)
+++ web/client/scripts/draw.js	(revision 6565)
@@ -27,6 +27,10 @@
 	this.cc.clearRect(0, 0, this.cc.canvas.width, this.cc.canvas.height);
 	//this.cc.globalAlpha = 0.5;
 
+	this.board = {
+		width: 0,
+		height: 0
+	};
 	this.GCs = new Array(GC_MAX_COUNT);
 	this.gc = undefined;
 	this.mask = "off";
@@ -88,6 +92,8 @@
 				return;
 			case "unit": this.setUnit(args[0]);
 				return;
+			case "brddim": this.boardDimensions(Number(args[0]), Number(args[1]));
+				return;
 			case "ver": this.version(Number(args[0]));
 				return;
 			default: this.comm.error("unknown command: " + command);
@@ -247,8 +253,11 @@
 	};
 }
 GraphicEngine.prototype.setLayerGroup = function (id, empty) {
-	if (this.currentLayerGroup && this.currentLayerGroup.isMask) {
+	if (this.enableDraw && this.currentLayerGroup && this.currentLayerGroup.isMask) {
+		this.maskCc.setTransform(1, 0, 0, 1, 0, 0);
+		this.mainCc.setTransform(1, 0, 0, 1, 0, 0);
 		this.mainCc.drawImage(this.maskCc.canvas, 0, 0);
+		this.setMatrix();
 		this.cc = this.mainCc;
 	}
 	this.currentLayerGroup = this.layerGroups[id];
@@ -262,9 +271,15 @@
 			}
 		}
 	}
-	if (this.currentLayerGroup && this.currentLayerGroup.isMask) {
+	if (this.enableDraw && this.currentLayerGroup && this.currentLayerGroup.isMask) {
 		this.cc = this.maskCc;
+		this.mainCc.setTransform(1, 0, 0, 1, 0, 0);
 		this.cc.clearRect(0, 0, this.cc.canvas.width, this.cc.canvas.height);
+		this.setMatrix();
+		this.cc.save();
+		this.cc.fillStyle = this.colors.mask;
+		this.cc.fillRect(0, 0, this.board.width, this.board.height);
+		this.cc.restore();
 	}
 }
 GraphicEngine.prototype.makeGC = function () {
@@ -339,6 +354,10 @@
 	}
 	this.unit = unit;
 }
+GraphicEngine.prototype.boardDimensions = function (w, h) {
+	this.board.width = w;
+	this.board.height = h;
+}
 
 
 function nanometerPerUnit(unit) {
Index: web/testclient/draw.js
===================================================================
--- web/testclient/draw.js	(revision 6564)
+++ web/testclient/draw.js	(revision 6565)
@@ -33,6 +33,7 @@
 		mainCc: mainCc,
 		maskCc: maskCc,
 		colors: {
+			mask: "#274f29"
 		},
 		purposeMap: {
 			mask: { hidden: true },