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// Copyright 2001 freehep
package org.freehep.graphicsio;
import java.io.IOException;
/**
* Implements the Quadratic Bezier Curve PathConstructor functionality in terms
* of Cubic Bezier Curves
*
* @author Mark Donszelmann
* @version $Id: freehep-graphicsio/src/main/java/org/freehep/graphicsio/QuadToCubicPathConstructor.java 5641ca92a537 2005/11/26 00:15:35 duns $
*/
public abstract class QuadToCubicPathConstructor extends
AbstractPathConstructor {
protected QuadToCubicPathConstructor() {
super();
}
public void move(double x, double y) throws IOException {
currentX = x;
currentY = y;
}
public void line(double x, double y) throws IOException {
currentX = x;
currentY = y;
}
public void quad(double x1, double y1, double x2, double y2)
throws IOException {
double xctrl1 = x1 + (currentX - x1) / 3.;
double yctrl1 = y1 + (currentY - y1) / 3.;
double xctrl2 = x1 + (x2 - x1) / 3.;
double yctrl2 = y1 + (y2 - y1) / 3.;
cubic(xctrl1, yctrl1, xctrl2, yctrl2, x2, y2);
currentX = x2;
currentY = y2;
}
public void cubic(double x1, double y1, double x2, double y2, double x3,
double y3) throws IOException {
currentX = x3;
currentY = y3;
}
public void closePath(double x0, double y0) throws IOException {
currentX = 0;
currentY = 0;
}
}
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