/*
* 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.graphics.visitor;
import com.google.gwt.canvas.dom.client.Context2d;
import gwt.g2d.client.graphics.Surface;
import gwt.g2d.client.math.Ellipse;
import gwt.g2d.client.math.MathHelper;
import gwt.g2d.shared.math.Vector2;
/**
* Adds a new ellipse to the subpath.
* The new position will be set to the location on the arc at 0 degree.
*
* @author hao1300@gmail.com
*/
public class EllipseVisitor implements ShapeVisitor {
private final double x, y, width, height;
/**
* Adds an ellipse with its top left at (x, y) and with the given width and
* height.
*/
public EllipseVisitor(double x, double y, double width, double height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public EllipseVisitor(Vector2 position, double width, double height) {
this(position.getX(), position.getY(), width, height);
}
public EllipseVisitor(Ellipse ellipse) {
this(ellipse.getX(), ellipse.getY(), ellipse.getWidth(), ellipse.getHeight());
}
@Override
public void visit(Surface surface) {
Context2d context = surface.getContext();
context.save();
context.translate(x + width / 2, y + height / 2);
context.scale(width / 2, height / 2);
context.arc(0, 0, 1, 0, MathHelper.TWO_PI, true);
context.restore();
}
}