ewe.fx
Class Curve

java.lang.Object
  ewe.fx.Curve

public class Curve

extends Object

This class provides methods for calculating points and bounds for linear, quadratic and cubic curves.

A Curve object is stateless but the methods are not static so that a better implementation can be created and substituted for the static variable "curve" if necessary.

Field Summary

static Curve	curve
static int	MAX_POINTS

Constructor Summary

Curve()

Method Summary

int	calculateCubes(float[] xpoints, float[] ypoints, int pointsOffset, Object destX, Object destY, int offset, int options) Calculate the curve points for the curve.
protected int	calculateCubes(float startx, float starty, float control1x, float control1y, float control2x, float control2y, float endx, float endy, Object destx, Object desty, int offset, int options)
int	calculateLines(float[] xpoints, float[] ypoints, int pointsOffset, Object destX, Object destY, int offset, int options) Calculate the line points for the line.
protected int	calculateLines(float startx, float starty, float endx, float endy, Object destx, Object desty, int offset, int options) This calculates the points on a quad curve, for either the x or y co-ordinate.
int	calculateQuads(float[] xpoints, float[] ypoints, int pointsOffset, Object destX, Object destY, int offset, int options) Calculate the curve points for the curve.
protected int	calculateQuads(float startx, float starty, float controlx, float controly, float endx, float endy, Object destx, Object desty, int offset, int options) This calculates the points on a quad curve, for either the x or y co-ordinate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, toString

Field Detail

curve

public static Curve curve

MAX_POINTS

public static final int MAX_POINTS

See Also:

Constant Field Values

Constructor Detail

Curve

public Curve()

Method Detail

calculateLines

protected int calculateLines(float startx,
                             float starty,
                             float endx,
                             float endy,
                             Object destx,
                             Object desty,
                             int offset,
                             int options)

This calculates the points on a quad curve, for either the x or y co-ordinate. This is called by the other calculateQuads method. If the destination object is null this should return the number of points in the curve.

This method does NOT include the last point on the curve, but DOES include the first one.

calculateQuads

protected int calculateQuads(float startx,
                             float starty,
                             float controlx,
                             float controly,
                             float endx,
                             float endy,
                             Object destx,
                             Object desty,
                             int offset,
                             int options)

This calculates the points on a quad curve, for either the x or y co-ordinate. This is called by the other calculateQuads method. If the destination object is null this should return the number of points in the curve.

This method does NOT include the last point on the curve, but DOES include the first one.

calculateCubes

protected int calculateCubes(float startx,
                             float starty,
                             float control1x,
                             float control1y,
                             float control2x,
                             float control2y,
                             float endx,
                             float endy,
                             Object destx,
                             Object desty,
                             int offset,
                             int options)

calculateLines

public int calculateLines(float[] xpoints,
                          float[] ypoints,
                          int pointsOffset,
                          Object destX,
                          Object destY,
                          int offset,
                          int options)

Calculate the line points for the line. This is trivial, since it is only the first point that is ever stored.

Parameters:

xpoints - The X coordinates for the curve. The first one should be the start point, the second should be the end point.

ypoints - The Y coordinates for the curve. The first one should be the start point, the second should be the end point. one should be the end point.

pointsOffset - The offset of the points in the xpoints and ypoints array.

destX - Either an int[] or float[] object to hold the destination X points. Can be null if you only are interested in the number of points that will be calculated.

destY - Either an int[] or float[] object to hold the destination Y points. Can be null if you only are interested in the number of points that will be calculated.

offset - The offset into the destX and destY arrays for the points to go.

options - No options are currently defined.

Returns:

The number of points that were, or will be put in the destinations.

calculateQuads

public int calculateQuads(float[] xpoints,
                          float[] ypoints,
                          int pointsOffset,
                          Object destX,
                          Object destY,
                          int offset,
                          int options)

Calculate the curve points for the curve.

Parameters:

xpoints - The X coordinates for the curve. The first one should be the start point, the second should be the control point and the third one should be the end point.

ypoints - The Y coordinates for the curve. The first one should be the start point, the second should be the control point and the third one should be the end point.

pointsOffset - The offset of the points in the xpoints and ypoints array.

destX - Either an int[] or float[] object to hold the destination X points. Can be null if you only are interested in the number of points that will be calculated.

destY - Either an int[] or float[] object to hold the destination Y points. Can be null if you only are interested in the number of points that will be calculated.

offset - The offset into the destX and destY arrays for the points to go.

options - No options are currently defined.

Returns:

The number of points that were, or will be put in the destinations.

calculateCubes

public int calculateCubes(float[] xpoints,
                          float[] ypoints,
                          int pointsOffset,
                          Object destX,
                          Object destY,
                          int offset,
                          int options)

Calculate the curve points for the curve.

Parameters:

xpoints - The X coordinates for the curve. The first one should be the start point, the second should be the control point and the third one should be the end point.

ypoints - The Y coordinates for the curve. The first one should be the start point, the second should be the control point and the third one should be the end point.

pointsOffset - The offset of the points in the xpoints and ypoints array.

destX - Either an int[] or float[] object to hold the destination X points. Can be null if you only are interested in the number of points that will be calculated.

destY - Either an int[] or float[] object to hold the destination Y points. Can be null if you only are interested in the number of points that will be calculated.

offset - The offset into the destX and destY arrays for the points to go.

options - No options are currently defined.

Returns:

The number of points that were, or will be put in the destinations.