GeneralPathWriter.java

/*
 * @(#)GeneralPathWriter.java
 *
 * $Date: 2014-03-13 09:15:48 +0100 (Cs, 13 márc. 2014) $
 *
 * Copyright (c) 2011 by Jeremy Wood.
 * All rights reserved.
 *
 * The copyright of this software is owned by Jeremy Wood. 
 * You may not use, copy or modify this software, except in  
 * accordance with the license agreement you entered into with  
 * Jeremy Wood. For details see accompanying license terms.
 * 
 * This software is probably, but not necessarily, discussed here:
 * https://javagraphics.java.net/
 * 
 * That site should also contain the most recent official version
 * of this software.  (See the SVN repository for more details.)
 */
package com.bric.geom;

import java.awt.geom.GeneralPath;

/** This writes path data to an underlying <code>GeneralPath</code>.
 * <P>This also omits redundant path information, such as two consecutive
 * calls to lineTo() that go to the same point.
 * <P>Also this is safe to make several consecutive calls to <code>closePath()</code>
 * (the GeneralPath will only be closed once, unless data has been written in the meantime.)
 * 
 */
public class GeneralPathWriter extends PathWriter {
	GeneralPath p;
	float lastX, lastY;
	boolean dataWritten = false;
	boolean debug = false;
	boolean eliminateRedundantLines = true;
	
	public GeneralPathWriter(GeneralPath p) {
		this.p = p;
	}
	
	/**
	 * 
	 * @param eliminateRedundantLines if true then calls to <code>lineTo()</code> that
	 * only repeat the current pen position are ignored.
	 */
	public void setEliminateRedundantLines(boolean eliminateRedundantLines) {
		this.eliminateRedundantLines = eliminateRedundantLines;
	}
	
	@Override
	public String toString() {
		return "GeneralPathWriter[ data = "+ShapeStringUtils.toString(p)+" ]";
	}
	
	/** If this is activated, output to the console will appear when shape instructions are written. */
	public void setDebug(boolean b) {
		debug = b;
	}
	
	@Override
	public void flush() {}
	
	/** This resets the underlying <code>GeneralPath</code>. */
	public void reset() {
		if(debug)
			System.out.println("reset()");
		p.reset();
		dataWritten = false;
	}

	@Override
	public void curveTo(float cx1, float cy1, float cx2, float cy2, float x,
			float y) {
		if(debug)
			System.out.println("curveTo( "+cx1+", "+cy1+", "+cx2+", "+cy2+", "+x+", "+y+")");
		p.curveTo(cx1,cy1,cx2,cy2,x,y);
		lastX = x;
		lastY = y;
		dataWritten = true;
	}

	@Override
	public void lineTo(float x, float y) {
		if(eliminateRedundantLines && equals(lastX,x) && equals(lastY,y))
			return;
		if(debug)
			System.out.println("lineTo( "+x+", "+y+")");
		p.lineTo(x,y);
		lastX = x;
		lastY = y;
		dataWritten = true;
	}
	
	@Override
	public void moveTo(float x, float y) {
		p.moveTo(x,y);
		if(debug)
			System.out.println("moveTo( "+x+", "+y+")");
		lastX = x;
		lastY = y;
		dataWritten = true;
	}

	@Override
	public void quadTo(float cx, float cy, float x, float y) {
		p.quadTo(cx, cy, x, y);
		if(debug)
			System.out.println("quadTo( "+cx+", "+cy+", "+x+", "+y+")");
		lastX = x;
		lastY = y;
		dataWritten = true;
	}
	
	@Override
	public void closePath() {
		if(dataWritten) {
			p.closePath();
			if(debug)
				System.out.println("closePath()");
			dataWritten = false;
		}
	}
	
	private static boolean equals(float z1,float z2) {
		float d = z2-z1;
		if(d<0) d = -d;
		if(d<.001f)
			return true;
		return false;
	}
}