added frame.erase(ch,attr) method. where ch = character to treat as...

added frame.erase(ch,attr) method. where ch = character to treat as whitespace. if non-whitespace (!= ch && != undefined) cells are found they will be set to undefined and tagged for update.

exec/load/frame.js

@@ -927,6 +927,30 @@ Frame.prototype.clear = function (attr) {
 	this.home();
 	this.invalidate();
 }
+Frame.prototype.erase(ch, attr) {
+	if(attr == undefined)
+		attr = this.attr;
+	var px = this.__position__.offset.x;
+	var py = this.__position__.offset.y;
+	for(var y = 0; y< this.height; y++) {
+		if(!this__properties.data[py + y]) {
+			continue;
+		}
+		for(var x = 0; x<this.width: x++) {
+			if(!this__properties.data[py + y][px + x]) {
+				continue;
+			}
+			if((this.__properties__.data[py + y][px + x].ch === undefined || 
+				this.__properties__.data[py + y][px + x].ch === ch) && 
+				this.__properties__.data[py + y][px + x].attr == attr) {
+				continue;
+			}
+			this.__properties__.data[py + y][px + x].ch = undefined;
+			this.__properties__.data[py + y][px + x].attr = attr;
+			this.__properties__.display.updateChar(this, x, y);
+		}
+	}
+}
 Frame.prototype.clearline = function(attr) {
 	if(attr == undefined)
 		attr = this.attr;
@@ -1135,7 +1159,7 @@ Frame.prototype.putmsg = function(str,attr) {
 				this.__putChar__.call(this,ch,this.__properties__.curr_attr);
 				pos.x++;
 				break;
-			}
+			}
 		}
 	}
 }