Package gwt.g2d.client.demo

Source Code of gwt.g2d.client.demo.PatternDemo

/*
* Copyright 2009 Hao Nguyen
*
* 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.
*/
package gwt.g2d.client.demo;

import gwt.g2d.client.graphics.PatternRepetition;
import gwt.g2d.client.graphics.TextAlign;
import gwt.g2d.client.graphics.TextBaseline;
import gwt.g2d.client.graphics.canvas.CanvasPattern;
import gwt.g2d.client.graphics.shapes.CircleShape;
import gwt.g2d.resources.client.ExternalImageResource;
import gwt.g2d.resources.client.ImageElementResource;

import com.google.gwt.core.client.GWT;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.ResourceCallback;
import com.google.gwt.resources.client.ResourceException;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Panel;

/**
* Demo for rendering pattern.
* Reference: <a href=
* "http://diveintohtml5.org/canvas.html">
* http://diveintohtml5.org/canvas.html</a>
*
* @author hao1300@gmail.com
*/
public class PatternDemo extends ReferenceDemo {
  public PatternDemo(Panel parentContainer) {
    super("Pattern Demo", parentContainer,
        "http://diveintohtml5.org/canvas.html");
  }

  @Override
  public void initialize() {
    super.initialize();
    Resources.INSTANCE.pastel().getImage(new ResourceCallback<ImageElementResource>() {
      @Override
      public void onSuccess(ImageElementResource resource) {
        CanvasPattern pattern = getPrimarySurface().createPattern(
            resource.getImage(), PatternRepetition.REPEAT);
        getPrimarySurface().setFillStyle(pattern)
            .fillRectangle(0, 0, 600, 200)
            .fillShape(new CircleShape(100, 300, 100))
            .setFont("60px sans-serif")
            .setTextAlign(TextAlign.CENTER)
            .setTextBaseline(TextBaseline.MIDDLE)
            .fillText("Hello World", 420, 300);
      }
     
      @Override
      public void onError(ResourceException e) {
        Window.alert("Error: " + e.getMessage());
      }
    });
  }
 
  interface Resources extends ClientBundle {
    static final Resources INSTANCE = GWT.create(Resources.class);
   
    @Source("images/pastel.png")
    ExternalImageResource pastel();
  }
}
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