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

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Here is the source code for gwt.g2d.client.graphics.visitor.CircleVisitor.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.Circle;
import gwt.g2d.client.math.MathHelper;
import gwt.g2d.shared.math.Vector2;

/**
 * Draws a circle to the current subpath.
 * The new position will be set to the location on the arc at 0 degree.
 * 
 * @author hao1300@gmail.com
 */
public class CircleVisitor implements ShapeVisitor {
    private final double x, y, radius;

    public CircleVisitor(double x, double y, double radius) {
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    public CircleVisitor(Vector2 center, double radius) {
        this(center.getX(), center.getY(), radius);
    }

    public CircleVisitor(Circle circle) {
        this(circle.getCenterX(), circle.getCenterY(), circle.getRadius());
    }

    @Override
    public void visit(Surface surface) {
        Context2d context = surface.getContext();
        context.arc(x, y, radius, 0, MathHelper.TWO_PI, true);
    }
}