org.geotools.gce.imagemosaic.egr

Class RendererUtilities

Object

RendererUtilities

public final class RendererUtilities
extends Object

This is a reduced copy of RenderUtilities found in the render module, to avoid adding a dependency on it while using only a few methods

Method Summary

Modifier and Type	Method and Description
static Envelope	createMapEnvelope(Rectangle paintArea, AffineTransform worldToScreen) Creates the map's bounding box in real world coordinates.
static AffineTransform	worldToScreenTransform(ReferencedEnvelope mapExtent, Rectangle paintArea) Sets up the affine transform NOTE It is worth to note that here we do not take into account the half a pixel translation stated by ogc for coverages bounds.

Methods inherited from class Object

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

Method Detail

worldToScreenTransform

public static AffineTransform worldToScreenTransform(ReferencedEnvelope mapExtent,
                                                     Rectangle paintArea)

Sets up the affine transform

NOTE It is worth to note that here we do not take into account the half a pixel translation stated by ogc for coverages bounds. One reason is that WMS 1.1.1 does not follow it!!!

Parameters:

mapExtent - the map extent

paintArea - the size of the rendering output area

Returns:

a transform that maps from real world coordinates to the screen

createMapEnvelope

public static Envelope createMapEnvelope(Rectangle paintArea,
                                         AffineTransform worldToScreen)
                                  throws NoninvertibleTransformException

Creates the map's bounding box in real world coordinates.

Parameters:

worldToScreen - a transform which converts World coordinates to screen pixel coordinates. No assumptions are done on axis order as this is assumed to be pre-calculated. The affine transform may specify an rotation, in case the envelope will encompass the complete (rotated) world polygon.

paintArea - the size of the rendering output area

Returns:

the envelope in world coordinates corresponding to the screen rectangle.

Throws:

NoninvertibleTransformException