Ellipse.java example

Explorer
geogebra-master
/*
 * SVG Salamander
 * Copyright (c) 2004, Mark McKay
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   - Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the following
 *     disclaimer.
 *   - Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials 
 *     provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 * 
 * Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
 * projects can be found at http://www.kitfox.com
 *
 * Created on January 26, 2004, 5:25 PM
 */
package com.kitfox.svg;

import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import com.kitfox.svg.xml.StyleAttribute;

/**
 * @author Mark McKay
 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
 */
public class Ellipse extends ShapeElement {

	public static final String TAG_NAME = "ellipse";
	float cx = 0.0f;
	float cy = 0.0f;
	float rx = 0.0f;
	float ry = 0.0f;
	Ellipse2D.Float ellipse = new Ellipse2D.Float();

	/**
	 * Creates a new instance of Rect
	 */
	public Ellipse() {
	}

	@Override
	public String getTagName() {
		return TAG_NAME;
	}

	@Override
	protected void build() throws SVGException {
		super.build();

		StyleAttribute sty = new StyleAttribute();

		if (getPres(sty.setName("cx"))) {
			cx = sty.getFloatValueWithUnits();
		}

		if (getPres(sty.setName("cy"))) {
			cy = sty.getFloatValueWithUnits();
		}

		if (getPres(sty.setName("rx"))) {
			rx = sty.getFloatValueWithUnits();
		}

		if (getPres(sty.setName("ry"))) {
			ry = sty.getFloatValueWithUnits();
		}

		ellipse.setFrame(cx - rx, cy - ry, rx * 2f, ry * 2f);
	}

	@Override
	public void render(Graphics2D g) throws SVGException {
		beginLayer(g);
		renderShape(g, ellipse);
		finishLayer(g);
	}

	@Override
	public Shape getShape() {
		return shapeToParent(ellipse);
	}

	@Override
	public Rectangle2D getBoundingBox() throws SVGException {
		return boundsToParent(includeStrokeInBounds(ellipse.getBounds2D()));
	}

	/**
	 * Updates all attributes in this diagram associated with a time event. Ie,
	 * all attributes with track information.
	 *
	 * @return - true if this node has changed state as a result of the time
	 *         update
	 */
	@Override
	public boolean updateTime(double curTime) throws SVGException {
		// if (trackManager.getNumTracks() == 0) return false;
		boolean changeState = super.updateTime(curTime);

		// Get current values for parameters
		StyleAttribute sty = new StyleAttribute();
		boolean shapeChange = false;

		if (getPres(sty.setName("cx"))) {
			float newCx = sty.getFloatValueWithUnits();
			if (newCx != cx) {
				cx = newCx;
				shapeChange = true;
			}
		}

		if (getPres(sty.setName("cy"))) {
			float newCy = sty.getFloatValueWithUnits();
			if (newCy != cy) {
				cy = newCy;
				shapeChange = true;
			}
		}

		if (getPres(sty.setName("rx"))) {
			float newRx = sty.getFloatValueWithUnits();
			if (newRx != rx) {
				rx = newRx;
				shapeChange = true;
			}
		}

		if (getPres(sty.setName("ry"))) {
			float newRy = sty.getFloatValueWithUnits();
			if (newRy != ry) {
				ry = newRy;
				shapeChange = true;
			}
		}

		if (shapeChange) {
			build();
			// ellipse.setFrame(cx - rx, cy - ry, rx * 2f, ry * 2f);
			// return true;
		}

		return changeState || shapeChange;
	}
}