Ptidej-v5.2-master/PADL Serialiser DB4O Tests/rsc/JHotDraw v5.1/src/CH/ifa/draw/figures/RadiusHandle.java
/*
 * @(#)RadiusHandle.java 5.1
 *
 */

package CH.ifa.draw.figures;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;

import CH.ifa.draw.framework.DrawingView;
import CH.ifa.draw.standard.AbstractHandle;
import CH.ifa.draw.util.Geom;

/**
 * A Handle to manipulate the radius of a round corner rectangle.
 */
class RadiusHandle extends AbstractHandle {

	private Point fRadius;
	private RoundRectangleFigure fOwner;
	private static final int OFFSET = 4;

	public RadiusHandle(RoundRectangleFigure owner) {
		super(owner);
		fOwner = owner;
	}

	public void invokeStart(int  x, int  y, DrawingView view) {
		fRadius = fOwner.getArc();
		fRadius.x = fRadius.x/2;
		fRadius.y = fRadius.y/2;
	}

	public void invokeStep (int x, int y, int anchorX, int anchorY, DrawingView view) {
		int dx = x-anchorX;
		int dy = y-anchorY;
		Rectangle r = fOwner.displayBox();
		int rx = Geom.range(0, r.width, 2*(fRadius.x + dx));
		int ry = Geom.range(0, r.height, 2*(fRadius.y + dy));
		fOwner.setArc(rx, ry);
	}

	public Point locate() {
		Point radius = fOwner.getArc();
		Rectangle r = fOwner.displayBox();
		return new Point(r.x+radius.x/2+OFFSET, r.y+radius.y/2+OFFSET);
	}

	public void draw(Graphics g) {
		Rectangle r = displayBox();

		g.setColor(Color.yellow);
		g.fillOval(r.x, r.y, r.width, r.height);

		g.setColor(Color.black);
		g.drawOval(r.x, r.y, r.width, r.height);
	}
}

