Index: web/client/scripts/draw.js
===================================================================
--- web/client/scripts/draw.js	(revision 6563)
+++ web/client/scripts/draw.js	(revision 6564)
@@ -8,6 +8,7 @@
  * @param options.comm - communication interface
  * @param options.canvas - HTML canvas rendering context
  * @param options.colors - color chart for symbolic color names
+ * @param options.purposeMap - prescriptions based on layer group purposes
  */
 function GraphicEngine(options) {
 	this.options = Object.assign({}, options);
@@ -17,6 +18,8 @@
 	this.cc = this.mainCc;
 	this.colors = options.colors;
 	this.unit = options.unit || "mm";
+	this.purposeMap = options.purposeMap && typeof options.purposeMap === "object" ?
+		options.purposeMap : {};
 
 	this.cc.imageSmoothingEnabled = false;
 	this.mainCc.setTransform(1, 0, 0, 1, 0, 0);
@@ -207,18 +210,32 @@
 	if (Array.isArray(location) && location.length > 0) {
 		locstr = location[0];
 	}
+	var purposes = [];
 	var isMask = false;
 	if (Array.isArray(purpose)) {
 		for (var i = 0; i < purpose.length; i++) {
+			if (typeof purpose[i] === "string") {
+				purposes.push(purpose[i]);
+			}
 			if (purpose[i] === "mask") {
 				isMask = true;
 			}
 		}
 	}
+	var props = {};
+	if (Array.isArray(properties)) {
+		for (var i = 0; i < properties.length; i++) {
+			if (typeof properties[i] === "string") {
+				props[properties[i]] = true;
+			}
+		}
+	}
 	this.layerGroups[id] = {
 		name: name,
 		id: id,
 		location: locstr,
+		purposes: purposes,
+		props: props,
 		isMask: isMask
 	};
 }
@@ -235,8 +252,16 @@
 		this.cc = this.mainCc;
 	}
 	this.currentLayerGroup = this.layerGroups[id];
-	var name = this.currentLayerGroup.name;
-	this.enableDraw = name !== "top mask" && name !== "bottom mask" && name !== "fab";
+	this.enableDraw = true;
+	if (this.currentLayerGroup) {
+		var purposes = this.currentLayerGroup.purposes;
+		for (var i = 0; i < purposes.length; ++i) {
+			pe = this.purposeMap[purposes[i]];
+			if (pe && pe.hidden) {
+				this.enableDraw = false;
+			}
+		}
+	}
 	if (this.currentLayerGroup && this.currentLayerGroup.isMask) {
 		this.cc = this.maskCc;
 		this.cc.clearRect(0, 0, this.cc.canvas.width, this.cc.canvas.height);
Index: web/testclient/draw.js
===================================================================
--- web/testclient/draw.js	(revision 6563)
+++ web/testclient/draw.js	(revision 6564)
@@ -6,7 +6,8 @@
 var draw = require("../client/scripts/draw");
 
 
-drawRemoteFile("../testdata/netlist.remote.gz");
+//drawRemoteFile("../testdata/netlist.remote.gz");
+drawRemoteFile("../testdata/poly_triangle.remote.gz");
 //drawRemoteFile("../testdata/line_normal.remote.gz");
 
 
@@ -32,6 +33,11 @@
 		mainCc: mainCc,
 		maskCc: maskCc,
 		colors: {
+		},
+		purposeMap: {
+			mask: { hidden: true },
+			paste: { hidden: true },
+			fab: { hidden: true }
 		}
 	});