xmltool.gui
Class QCurve

java.lang.Object
  |
  +--java.awt.geom.QuadCurve2D
        |
        +--java.awt.geom.QuadCurve2D.Double
              |
              +--xmltool.gui.QCurve

public class QCurve

extends java.awt.geom.QuadCurve2D.Double

implements java.io.Serializable

The QCurve class enhances the QuadCurve.Double class (from the java.awt.geom package) by allowing entities to move along such quadratic curves.

See Also:

Serialized Form

Inner classes inherited from class java.awt.geom.QuadCurve2D

java.awt.geom.QuadCurve2D.Double, java.awt.geom.QuadCurve2D.Float

Field Summary

boolean

straight Flag indicating whether curve is actaully a straight line.

Fields inherited from class java.awt.geom.QuadCurve2D.Double

ctrlx, ctrly, x1, x2, y1, y2

Constructor Summary

QCurve()
Construct an empty quad curve.

QCurve(double x1, double y1, double x2, double y2)
Construct a straight line (degenerate quad curve).

QCurve(double x1, double y1, double ctrlx, double ctrly, double x2, double y2)
Construct a quad curve.

Method Summary

java.awt.geom.Point2D.Double	getControl() Return the control point of the quad curve.
java.awt.geom.Point2D.Double	getFirst() Return the first/start point of the quad curve.
java.awt.geom.Point2D.Double	getLast() Return the last/end point of the quad curve.
boolean	isSame(double x, double y, double xe, double ye, double step) Are (x, y) and (xe, ye) essentially the same?
java.awt.geom.Point2D.Double	next(java.awt.geom.Point2D.Double current, double step) Return the next point on the quad curve (step units beyond current).
void	setFirst(java.awt.geom.Point2D.Float delta) Reset first point in curve.
void	setLast(java.awt.geom.Point2D.Float delta) Reset last point in curve.

Methods inherited from class java.awt.geom.QuadCurve2D.Double

getBounds2D, getCtrlPt, getCtrlX, getCtrlY, getP1, getP2, getX1, getX2, getY1, getY2, setCurve

Methods inherited from class java.awt.geom.QuadCurve2D

clone, contains, contains, contains, contains, getBounds, getFlatness, getFlatness, getFlatness, getFlatnessSq, getFlatnessSq, getFlatnessSq, getPathIterator, getPathIterator, intersects, intersects, setCurve, setCurve, setCurve, setCurve, solveQuadratic, subdivide, subdivide, subdivide

Methods inherited from class java.lang.Object

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

Field Detail

straight

public final boolean straight

Flag indicating whether curve is actaully a straight line.

Constructor Detail

QCurve

public QCurve()

Construct an empty quad curve.

QCurve

public QCurve(double x1,
              double y1,
              double x2,
              double y2)

Construct a straight line (degenerate quad curve).

Parameters:

x1 - x coordinate of start point

y1 - y coordinate of start point

x2 - x coordinate of end point

y2 - y coordinate of end point

QCurve

public QCurve(double x1,
              double y1,
              double ctrlx,
              double ctrly,
              double x2,
              double y2)

Construct a quad curve.

Parameters:

x1 - x coordinate of start point

y1 - y coordinate of start point

ctrlx - x coordinate of control point

ctrly - y coordinate of control point

x2 - x coordinate of end point

y2 - y coordinate of end point

Method Detail

getFirst

public java.awt.geom.Point2D.Double getFirst()

Return the first/start point of the quad curve.

Returns:

Point2D.Double the first point

getControl

public java.awt.geom.Point2D.Double getControl()

Return the control point of the quad curve.

Returns:

Point2D.Double the control point

getLast

public java.awt.geom.Point2D.Double getLast()

Return the last/end point of the quad curve.

Returns:

Point2D.Double the last point

setFirst

public void setFirst(java.awt.geom.Point2D.Float delta)

Reset first point in curve.

Parameters:

delta - translation vector

setLast

public void setLast(java.awt.geom.Point2D.Float delta)

Reset last point in curve.

Parameters:

delta - translation vector

isSame

public boolean isSame(double x,
                      double y,
                      double xe,
                      double ye,
                      double step)

Are (x, y) and (xe, ye) essentially the same?

Returns:

boolean true if essentially the same point

next

public java.awt.geom.Point2D.Double next(java.awt.geom.Point2D.Double current,
                                         double step)

Return the next point on the quad curve (step units beyond current). Return null if past end point.

Parameters:

current - the current point

step - distance to next point

Returns:

Point2D.Double the next point