org.deegree.graphics.transformation
Class WorldToScreenTransform

java.lang.Object
  org.deegree.graphics.transformation.WorldToScreenTransform

All Implemented Interfaces:

GeoTransform

public class WorldToScreenTransform
extends Object
implements GeoTransform

the class WorldToScreenTransform implements GeoTransformInterface and defines a transformation to a linear coordinat system with its orgin on top/left. this can be used for realising a screen mapping of geometries.

Version:

28.12.2000

Author:

Andreas Poth poth@lat-lon.de

Constructor Summary

WorldToScreenTransform()
constructor initialices the transfromation rectangles with unique values (origin 0/0; widht 1; height 1)

WorldToScreenTransform(double sourceXMin, double sourceYMin, double sourceXMax, double sourceYMax, double destXMin, double destYMin, double destXMax, double destYMax)
constrctor

WorldToScreenTransform(Envelope sourceRect, Envelope destRect)
constructor initialices the transformation rectangle using the submitted source- and destination rectangle.

Method Summary

protected void	calculateQX() calculates the relation between the width of the destination and the source coordinate system.
protected void	calculateQY() calculates the relation between the height of the destination and the source coordinate system.
Position	getDestPoint(Position point) executes a coordinat transformation for the submitted point of the source coordinat system.
Envelope	getDestRect()
double	getDestX(double xsource) executes a coordinat transformation for the submitted x-coordinate of the source coordinat system.
double	getDestY(double ysource) executes a coordinat transformation for the submitted y-coordinate of the source coordinat system.
Position	getSourcePoint(Position point) executes a coordinat transformation for the submitted point of the destination coordinate system.
Envelope	getSourceRect()
double	getSourceX(double xdest) executes a coordinat transformation for the submitted x-coordinate of the destination coordinate system.
double	getSourceY(double ydest) executes a coordinat transformation for the submitted y-coordinate of the destination coordinate system.
void	setDestRect(double xMin, double yMin, double xMax, double yMax) sets the destination rectangle
void	setDestRect(Envelope rect) sets the destination rectangle.
void	setSourceRect(double xMin, double yMin, double xMax, double yMax) sets the source rectangle
void	setSourceRect(Envelope rect) sets the source rectangle

Methods inherited from class java.lang.Object

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

Constructor Detail

WorldToScreenTransform

public WorldToScreenTransform()

constructor initialices the transfromation rectangles with unique values (origin 0/0; widht 1; height 1)

WorldToScreenTransform

public WorldToScreenTransform(Envelope sourceRect,
                              Envelope destRect)

constructor initialices the transformation rectangle using the submitted source- and destination rectangle.

Parameters:

sourceRect - is the boundary of the source geometry.

destRect - is the boundary of the destination rectangle (for example a region on the screen)

WorldToScreenTransform

public WorldToScreenTransform(double sourceXMin,
                              double sourceYMin,
                              double sourceXMax,
                              double sourceYMax,
                              double destXMin,
                              double destYMin,
                              double destXMax,
                              double destYMax)

constrctor

Parameters:

sourceXMin - minimum x-coordinate (source system) of the map.

sourceYMin - minimum y-coordinate (source system) of the map.

sourceXMax - maximum x-coordinate (source system) of the map.

sourceYMax - maximum y-coordinate (source system) of the map.

destXMin - minimum x-coordinate (destination system) of the map.

destYMin - minimum y-coordinate (destination system) of the map.

destXMax - maximum x-coordinate (destination system) of the map.

destYMax - maximum y-coordinate (destination system) of the map.

Method Detail

setSourceRect

public void setSourceRect(Envelope rect)

sets the source rectangle

Specified by:

setSourceRect in interface GeoTransform

Parameters:

rect - is the boundary of the source geometry.

setSourceRect

public void setSourceRect(double xMin,
                          double yMin,
                          double xMax,
                          double yMax)

sets the source rectangle

Specified by:

setSourceRect in interface GeoTransform

Parameters:

xMin - minimum x-coordinate (source system) of the map.

yMin - minimum y-coordinate (source system) of the map.

xMax - maximum x-coordinate (source system) of the map.

yMax - maximum y-coordinate (source system) of the map.

getSourceRect

public Envelope getSourceRect()

Specified by:

getSourceRect in interface GeoTransform

Returns:

source rectange

setDestRect

public void setDestRect(Envelope rect)

sets the destination rectangle.

Specified by:

setDestRect in interface GeoTransform

Parameters:

rect - is the boundary of the destination rectangle (for example a region on the screen)

setDestRect

public void setDestRect(double xMin,
                        double yMin,
                        double xMax,
                        double yMax)

sets the destination rectangle

Specified by:

setDestRect in interface GeoTransform

Parameters:

xMin - minimum x-coordinate (destination system) of the map.

yMin - minimum y-coordinate (destination system) of the map.

xMax - maximum x-coordinate (destination system) of the map.

yMax - maximum y-coordinate (destination system) of the map.

getDestRect

public Envelope getDestRect()

Specified by:

getDestRect in interface GeoTransform

Returns:

destination rectange

getDestX

public double getDestX(double xsource)

executes a coordinat transformation for the submitted x-coordinate of the source coordinat system.

Specified by:

getDestX in interface GeoTransform

Parameters:

xsource - x-coordinate of a point in the source coordinate system.

Returns:

the x-coordinate of the submitted value in the destination coordinate system.

getDestY

public double getDestY(double ysource)

executes a coordinat transformation for the submitted y-coordinate of the source coordinat system.

Specified by:

getDestY in interface GeoTransform

Parameters:

ysource - y-coordinate of a point in the source coordinate system.

Returns:

the y-coordinate of the submitted value in the destination coordinate system.

getDestPoint

public Position getDestPoint(Position point)

executes a coordinat transformation for the submitted point of the source coordinat system.

Specified by:

getDestPoint in interface GeoTransform

Parameters:

point - in the source coordinate system.

Returns:

the location of the submitted point in the destination coordinate system.

getSourceX

public double getSourceX(double xdest)

executes a coordinat transformation for the submitted x-coordinate of the destination coordinate system.

Specified by:

getSourceX in interface GeoTransform

Parameters:

xdest - x-coordinate of a point in the destination coordinate system.

Returns:

the x-coordinate of the submitted value in the source coordinate system.

getSourceY

public double getSourceY(double ydest)

executes a coordinat transformation for the submitted y-coordinate of the destination coordinate system.

Specified by:

getSourceY in interface GeoTransform

Parameters:

ydest - y-coordinate of a point in the destination coordinate system.

Returns:

the y-coordinate of the submitted value in the source coordinate system.

getSourcePoint

public Position getSourcePoint(Position point)

executes a coordinat transformation for the submitted point of the destination coordinate system.

Specified by:

getSourcePoint in interface GeoTransform

Parameters:

point - in the destination coordinate system.

Returns:

the location of the submitted point in the source coordinate system.

calculateQX

protected void calculateQX()

calculates the relation between the width of the destination and the source coordinate system.

calculateQY

protected void calculateQY()

calculates the relation between the height of the destination and the source coordinate system.