GWTGradient.java

/**
 * Copyright 2008 - 2015 The Loon Game Engine Authors
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 * 
 * @project loon
 * @author cping
 * @email：javachenpeng@yahoo.com
 * @version 0.5
 */
package loon.html5.gwt;

import loon.canvas.Gradient;
import loon.canvas.LColor;

import com.google.gwt.canvas.dom.client.CanvasGradient;
import com.google.gwt.canvas.dom.client.Context2d;

public class GWTGradient extends Gradient {

	final CanvasGradient gradient;

	public GWTGradient(Context2d ctx, Config config) {
		if (config instanceof Linear) {
			Linear cfg = (Linear) config;
			gradient = ctx.createLinearGradient(cfg.x0, cfg.y0, cfg.x1, cfg.y1);
			for (int ii = 0; ii < cfg.colors.length; ++ii) {
				gradient.addColorStop(cfg.positions[ii],
						LColor.cssColorString(cfg.colors[ii]));
			}
		} else if (config instanceof Radial) {
			Radial cfg = (Radial) config;
			gradient = ctx.createRadialGradient(cfg.x, cfg.y, 0, cfg.x, cfg.y,
					cfg.r);
			for (int ii = 0; ii < cfg.colors.length; ++ii) {
				gradient.addColorStop(cfg.positions[ii],
						LColor.cssColorString(cfg.colors[ii]));
			}
		} else
			throw new IllegalArgumentException("HtmlGradient Error: " + config);
	}
}