Add underdraw support

src/create-object.js

@@ -63,7 +63,7 @@ module.exports = function createObject(options) {
 				originY: this.originY
 			});
 
-			context.drawImage(this.cacheCanvas, defaultValue(options.x, 0) + offset.x, defaultValue(options.y, 0) + offset.y);
+			context.drawImage(this.cacheCanvas, defaultValue(options.x, 0) + offset.x - this.renderUnderdrawX, defaultValue(options.y, 0) + offset.y - this.renderUnderdrawY);
 
 			this.emit("rendered");
 		},
@@ -76,6 +76,8 @@ module.exports = function createObject(options) {
 			this.renderHeight = newSize.height * this.scaleY;
 			this.renderOffsetX = defaultValue(newSize.offsetX, 0) * this.scaleX;
 			this.renderOffsetY = defaultValue(newSize.offsetY, 0) * this.scaleY;
+			this.renderUnderdrawX = defaultValue(newSize.underdrawX, 0) * this.scaleX;
+			this.renderUnderdrawY = defaultValue(newSize.underdrawY, 0) * this.scaleY;
 
 			this.cacheCanvas.width = this.renderWidth;
 			this.cacheCanvas.height = this.renderHeight;