org.freehep.graphicsio
Class CubicToQuadPathConstructor

java.lang.Object
  org.freehep.graphicsio.AbstractPathConstructor
      org.freehep.graphicsio.CubicToQuadPathConstructor

All Implemented Interfaces:

PathConstructor

Direct Known Subclasses:

SWFPathConstructor

public abstract class CubicToQuadPathConstructor

extends AbstractPathConstructor

Implements the Cubic Bezier Curve PathConstructor functionality in terms of Quadratic Bezier Curves Uses the same algorithm published as ActionScript (SWF) by Robert Penner: ========================== Cubic Bezier Drawing v1.1 ========================== recursive quadratic approximation with adjustable tolerance March 4, 2004 Robert Penner www.robertpenner.com/tools/bezier_cubic.zip file: bezier_draw_cubic.as ==========================

Version:

$Id: CubicToQuadPathConstructor.java,v 1.7 2004/12/28 18:02:44 duns Exp $

Author:

Mark Donszelmann

Source Code:

CubicToQuadPathConstructor.java

Field Summary

Fields inherited from class org.freehep.graphicsio.AbstractPathConstructor

currentX, currentY

Constructor Summary

protected

CubicToQuadPathConstructor(double resolution)

Method Summary

void	closePath(double x0, double y0) Closes the path by drawing a straight line to the last point which was argument to move.
void	cubic(double x1, double y1, double x2, double y2, double x3, double y3) Draws a cubic bezier curve from the current point to (x3, y3) using the control points (x1, y1) and (x2, y2) and make (x3, y3) the current point.
static Point2D	intersect(Point2D p1, Point2D p2, Point2D p3, Point2D p4)
void	line(double x, double y) Draws a line from the current point to (x,y) and make (x,y) the current point.
static void	main(String[] args)
static Point2D	midPoint(Point2D a, Point2D b)
void	move(double x, double y) Makes (x,y) the current point.
void	quadratify(Point2D a, Point2D b, Point2D c, Point2D d)

Methods inherited from class org.freehep.graphicsio.AbstractPathConstructor

addPath, addPath, addPath, flush, isEvenOdd

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.freehep.graphicsio.PathConstructor

quad

Constructor Detail

CubicToQuadPathConstructor

protected CubicToQuadPathConstructor(double resolution)

Method Detail

move

public void move(double x,
                 double y)
          throws IOException

Description copied from interface: PathConstructor

Makes (x,y) the current point.

Throws:

IOException

line

public void line(double x,
                 double y)
          throws IOException

Description copied from interface: PathConstructor

Draws a line from the current point to (x,y) and make (x,y) the current point.

Throws:

IOException

cubic

public void cubic(double x1,
                  double y1,
                  double x2,
                  double y2,
                  double x3,
                  double y3)
           throws IOException

Description copied from interface: PathConstructor

Draws a cubic bezier curve from the current point to (x3, y3) using the control points (x1, y1) and (x2, y2) and make (x3, y3) the current point.

Throws:

IOException

closePath

public void closePath(double x0,
                      double y0)
               throws IOException

Description copied from interface: PathConstructor

Closes the path by drawing a straight line to the last point which was argument to move.

Throws:

IOException

intersect

public static Point2D intersect(Point2D p1,
                                Point2D p2,
                                Point2D p3,
                                Point2D p4)

midPoint

public static Point2D midPoint(Point2D a,
                               Point2D b)

quadratify

public void quadratify(Point2D a,
                       Point2D b,
                       Point2D c,
                       Point2D d)
                throws IOException

Throws:

IOException

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception