gwt.g2d.client.graphics.visitor.EllipseVisitor.java Source code

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Here is the source code for gwt.g2d.client.graphics.visitor.EllipseVisitor.java

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/*
 * 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();
    }
}