RoundedRectangle.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.draw2d;

import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * Draws a Rectangle whose corners are rounded in appearance. The size of the rectangle is 
 * determined by the bounds set to it.
 */
public class RoundedRectangle extends Shape {

	/** The width and height radii applied to each corner. */
	protected Dimension corner = new Dimension(8, 8);
	
	/**
	 * Constructs a round cornered rectangle.
	 */
	public RoundedRectangle() { }
	
	/**
	 * @see Shape#fillShape(Graphics)
	 */
	protected void fillShape(Graphics graphics) {
		graphics.fillRoundRectangle(getBounds(), corner.width, corner.height);
	}
	
	/**
	 * @see Shape#outlineShape(Graphics)
	 */
	protected void outlineShape(Graphics graphics) {
	    float lineInset = Math.max(1.0f, getLineWidthFloat()) / 2.0f;
	    int inset1 = (int)Math.floor(lineInset);
	    int inset2 = (int)Math.ceil(lineInset);
	
	    Rectangle r = Rectangle.SINGLETON.setBounds(getBounds());
	    r.x += inset1 ; 
	    r.y += inset1; 
	    r.width -= inset1 + inset2;
	    r.height -= inset1 + inset2;
		
		graphics.drawRoundRectangle(r, Math.max(0, corner.width - (int)lineInset), Math.max(0, corner.height - (int)lineInset));
	}
	
	/**
	 * Sets the dimensions of each corner. This will form the radii of the arcs which form the
	 * corners.
	 *
	 * @param d the dimensions of the corner
	 * @since 2.0
	 */
	public void setCornerDimensions(Dimension d) {
		corner.width = d.width;
		corner.height = d.height;
	}
}