function() {
			var self = this;
			//self.pointLocationArr = [];
			if (self.cxt) {
				self.cxt.clearRect(0, 0, self.CW, self.CH);
				self.draw(self.cxt, self.pointLocationArr, [], {
					X: 0,
					Y: 0
				});
			}
		}
function() {
			var self = this;
			//self.pointLocationArr = [];
			if (self.cxt) {
				self.cxt.clearRect(0, 0, self.CW, self.CH);
				self.draw(self.cxt, self.pointLocationArr, [], {
					X: 0,
					Y: 0
				});
			}
		}
function ( ) { var self = this ; //self.pointLocationArr = []; if ( self . cxt ) { self . cxt . clearRect ( 0 , 0 , self . CW , self . CH ) ; self . draw ( self . cxt , self . pointLocationArr , [ ] , { X : 0 , Y : 0 } ) ; } }
清除图形
清除图形
Draws the region region