ch.sahits.game.javafx.effects.transform

Class PolygonPerspectiveTransformation

java.lang.Object

ch.sahits.game.javafx.effects.transform.PolygonPerspectiveTransformation

public class PolygonPerspectiveTransformation
extends Object

The perspective transformation can be expressed as a matrix multiplication: http://upload.wikimedia.org/math/d/6/5/d65e582afbf418e4989971cdee42a167.png. The transformation matrix of a polygon is defined by the transformation of the bounding box of the polygon. The general case where the four corners of the bounding box are translated can be reduced to the special case where only three corners are translated. Therefore this transformation algorithm will take the source and destination points in 2D space of the three corners that are moved.

Author:

andi

Property Summary

Type	Property and Description
javafx.beans.property.ObjectProperty<Translation2D>	point1
javafx.beans.property.ObjectProperty<Translation2D>	point2
javafx.beans.property.ObjectProperty<Translation2D>	point3

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	PolygonPerspectiveTransformation.RecalculationEventListener Ensure that the values are recalculated on property change.

Field Summary

Fields

Modifier and Type	Field and Description
private double	a11
private double	a12
private double	a21
private double	a22
private double	b1
private double	b2
private static Translation2D	ORIGIN_ORIGIN
private javafx.beans.property.ObjectProperty<Translation2D>	point1
private javafx.beans.property.ObjectProperty<Translation2D>	point2
private javafx.beans.property.ObjectProperty<Translation2D>	point3

Constructor Summary

Constructors

Constructor and Description
PolygonPerspectiveTransformation() Initializing the transormation by adding transformation listeners on the points.

Method Summary

Modifier and Type	Method and Description
private void	calculate() Recalculate the matrix values based on the points.
private double	calculateA11()
private double	calculateA12()
private double	calculateA21()
private double	calculateA22()
private double	calculateB1()
private double	calculateB2()
private List<javafx.geometry.Point2D>	convertToPoints(javafx.collections.ObservableList<Double> points)
Translation2D	getPoint1() Gets the value of the property point1.
Translation2D	getPoint2() Gets the value of the property point2.
Translation2D	getPoint3() Gets the value of the property point3.
javafx.beans.property.ObjectProperty<Translation2D>	point1Property()
javafx.beans.property.ObjectProperty<Translation2D>	point2Property()
javafx.beans.property.ObjectProperty<Translation2D>	point3Property()
void	setPoint1(Translation2D value) Sets the value of the property point1.
void	setPoint2(Translation2D value) Sets the value of the property point2.
void	setPoint3(Translation2D value) Sets the value of the property point3.
javafx.scene.shape.Polygon	transform(javafx.scene.shape.Polygon polygon) Transform a polygon using the defined perspective transformation

Methods inherited from class java.lang.Object

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

Property Detail

point3

public javafx.beans.property.ObjectProperty<Translation2D> point3Property

See Also:

getPoint3(), setPoint3(Translation2D)

point2

public javafx.beans.property.ObjectProperty<Translation2D> point2Property

See Also:

getPoint2(), setPoint2(Translation2D)

point1

public javafx.beans.property.ObjectProperty<Translation2D> point1Property

See Also:

getPoint1(), setPoint1(Translation2D)

Field Detail

ORIGIN_ORIGIN

private static final Translation2D ORIGIN_ORIGIN

point1

private final javafx.beans.property.ObjectProperty<Translation2D> point1

point2

private final javafx.beans.property.ObjectProperty<Translation2D> point2

point3

private final javafx.beans.property.ObjectProperty<Translation2D> point3

a11

private double a11

a12

private double a12

a21

private double a21

a22

private double a22

b1

private double b1

b2

private double b2

Constructor Detail

PolygonPerspectiveTransformation

public PolygonPerspectiveTransformation()

Initializing the transormation by adding transformation listeners on the points.

Method Detail

calculate

private void calculate()

Recalculate the matrix values based on the points.

calculateA12

private double calculateA12()

calculateA11

private double calculateA11()

calculateB1

private double calculateB1()

calculateA22

private double calculateA22()

calculateA21

private double calculateA21()

calculateB2

private double calculateB2()

transform

public javafx.scene.shape.Polygon transform(javafx.scene.shape.Polygon polygon)

Transform a polygon using the defined perspective transformation

Parameters:

polygon -

Returns:

convertToPoints

private List<javafx.geometry.Point2D> convertToPoints(javafx.collections.ObservableList<Double> points)

getPoint3

public Translation2D getPoint3()

Gets the value of the property point3.

setPoint3

public void setPoint3(Translation2D value)

Sets the value of the property point3.

point3Property

public javafx.beans.property.ObjectProperty<Translation2D> point3Property()

See Also:

getPoint3(), setPoint3(Translation2D)

getPoint2

public Translation2D getPoint2()

Gets the value of the property point2.

setPoint2

public void setPoint2(Translation2D value)

Sets the value of the property point2.

point2Property

public javafx.beans.property.ObjectProperty<Translation2D> point2Property()

See Also:

getPoint2(), setPoint2(Translation2D)

getPoint1

public Translation2D getPoint1()

Gets the value of the property point1.

setPoint1

public void setPoint1(Translation2D value)

Sets the value of the property point1.

point1Property

public javafx.beans.property.ObjectProperty<Translation2D> point1Property()

See Also:

getPoint1(), setPoint1(Translation2D)