ImageWarp.GridTransform (JOSM)

java.lang.Object
- org.openstreetmap.josm.tools.ImageWarp.GridTransform

All Implemented Interfaces:

ImageWarp.PointTransform

Enclosing class:

ImageWarp
```
public static class ImageWarp.GridTransform
extends java.lang.Object
implements ImageWarp.PointTransform
```
Wrapper that optimizes a given ImageWarp.PointTransform.
It does so by spanning a grid with certain step size. It will invoke the potentially expensive master transform only at those grid points and use bilinear interpolation to approximate transformed values in between.
For memory optimization, this class assumes that rows are more or less scanned one-by-one as is done in ImageWarp.warp(java.awt.image.BufferedImage, java.awt.Dimension, org.openstreetmap.josm.tools.ImageWarp.PointTransform, org.openstreetmap.josm.tools.ImageWarp.Interpolation). I.e. this transform is not random access in the y coordinate.

Field Summary

Fields
Modifier and Type	Field	Description
`private java.util.Map<java.lang.Integer,java.util.Map<java.lang.Integer,java.awt.geom.Point2D>>`	`cache`
`private boolean`	`consistencyTest`
`private java.util.Set<java.lang.Integer>`	`deletedRows`
`private double`	`stride`
`private ImageWarp.PointTransform`	`trfm`

Constructor Summary

Constructors
Constructor Description

GridTransform(ImageWarp.PointTransform trfm, double stride)
Create a new GridTransform.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private void`	`cleanUp(int yIdx)`
`private java.util.Map<java.lang.Integer,java.awt.geom.Point2D>`	`getRow(int yIdx)`
`private java.awt.geom.Point2D`	`getValue(int xIdx, int yIdx)`
`java.awt.geom.Point2D`	`transform(double x, double y)`	Translates pixel coordinates.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

stride
```
private final double stride
```

trfm

private final ImageWarp.PointTransform trfm

cache

private final java.util.Map<java.lang.Integer,java.util.Map<java.lang.Integer,java.awt.geom.Point2D>> cache

consistencyTest
```
private final boolean consistencyTest
```

deletedRows

private final java.util.Set<java.lang.Integer> deletedRows

Constructor Detail
- GridTransform
```
public GridTransform(ImageWarp.PointTransform trfm,
                     double stride)
```
  Create a new GridTransform.
  
  Parameters:
  
  trfm - the master transform, that needs to be optimized
  
  stride - step size

Method Detail

transform
```
public java.awt.geom.Point2D transform(double x,
                                       double y)
```
Description copied from interface: ImageWarp.PointTransform

Translates pixel coordinates.

Specified by:

transform in interface ImageWarp.PointTransform

Parameters:

x - The x coordinate

y - The y coordinate

Returns:

transformed pixel coordinates

getValue

private java.awt.geom.Point2D getValue(int xIdx,
                                       int yIdx)

getRow

private java.util.Map<java.lang.Integer,java.awt.geom.Point2D> getRow(int yIdx)

cleanUp
```
private void cleanUp(int yIdx)
```