程序包 org.meteoinfo.image.filter

类 PerspectiveFilter

java.lang.Object

org.meteoinfo.image.filter.AbstractBufferedImageOp

org.meteoinfo.image.filter.TransformFilter

org.meteoinfo.image.filter.PerspectiveFilter

所有已实现的接口:

BufferedImageOp, Cloneable

public class PerspectiveFilter
extends TransformFilter

A filter which performs a perspective distortion on an image. Coordinates are treated as if the image was a unit square, i.e. the bottom-right corner of the image is at (1, 1). The filter maps the unit square onto an arbitrary convex quadrilateral or vice versa.

字段概要

从类继承的字段 org.meteoinfo.image.filter.TransformFilter

BILINEAR, CLAMP, edgeAction, interpolation, NEAREST_NEIGHBOUR, originalSpace, RGB_CLAMP, transformedSpace, WRAP, ZERO

构造器概要

构造器

构造器	说明
PerspectiveFilter()	Construct a PerspectiveFilter.
PerspectiveFilter(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)	Construct a PerspectiveFilter.

方法概要

修饰符和类型	方法	说明
BufferedImage	filter(BufferedImage src, BufferedImage dst)
Rectangle2D	getBounds2D(BufferedImage src)
boolean	getClip()
float	getOriginX()	Get the origin of the output image.
float	getOriginY()	Get the origin of the output image.
Point2D	getPoint2D(Point2D srcPt, Point2D dstPt)
void	quadToUnitSquare(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)	Set the transform to map a quadrilateral onto the unit square.
void	setClip(boolean clip)
void	setCorners(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)	Set the new positions of the image corners.
String	toString()
protected void	transformInverse(int x, int y, float[] out)	Inverse transform a point.
protected void	transformSpace(Rectangle rect)	Forward transform a rectangle.
void	unitSquareToQuad(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)	Set the transform to map the unit square onto a quadrilateral.

从类继承的方法 org.meteoinfo.image.filter.TransformFilter

filterPixelsNN, getEdgeAction, getInterpolation, setEdgeAction, setInterpolation

从类继承的方法 org.meteoinfo.image.filter.AbstractBufferedImageOp

clone, createCompatibleDestImage, getRenderingHints, getRGB, setRGB

从类继承的方法 java.lang.Object

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

构造器详细资料

PerspectiveFilter

public PerspectiveFilter()

Construct a PerspectiveFilter.

PerspectiveFilter

public PerspectiveFilter(float x0,
                         float y0,
                         float x1,
                         float y1,
                         float x2,
                         float y2,
                         float x3,
                         float y3)

Construct a PerspectiveFilter.

参数:

x0 - the new position of the top left corner

y0 - the new position of the top left corner

x1 - the new position of the top right corner

y1 - the new position of the top right corner

x2 - the new position of the bottom right corner

y2 - the new position of the bottom right corner

x3 - the new position of the bottom left corner

y3 - the new position of the bottom left corner

方法详细资料

setClip

public void setClip(boolean clip)

getClip

public boolean getClip()

setCorners

public void setCorners(float x0,
                       float y0,
                       float x1,
                       float y1,
                       float x2,
                       float y2,
                       float x3,
                       float y3)

Set the new positions of the image corners. This is the same as unitSquareToQuad, but the coordinates are in image pixels, not relative to the unit square. This method is provided as a convenience.

参数:

x0 - the new position of the top left corner

y0 - the new position of the top left corner

x1 - the new position of the top right corner

y1 - the new position of the top right corner

x2 - the new position of the bottom right corner

y2 - the new position of the bottom right corner

x3 - the new position of the bottom left corner

y3 - the new position of the bottom left corner

unitSquareToQuad

public void unitSquareToQuad(float x0,
                             float y0,
                             float x1,
                             float y1,
                             float x2,
                             float y2,
                             float x3,
                             float y3)

Set the transform to map the unit square onto a quadrilateral. When filtering, all coordinates will be scaled by the size of the image.

参数:

x0 - the new position of the top left corner

y0 - the new position of the top left corner

x1 - the new position of the top right corner

y1 - the new position of the top right corner

x2 - the new position of the bottom right corner

y2 - the new position of the bottom right corner

x3 - the new position of the bottom left corner

y3 - the new position of the bottom left corner

quadToUnitSquare

public void quadToUnitSquare(float x0,
                             float y0,
                             float x1,
                             float y1,
                             float x2,
                             float y2,
                             float x3,
                             float y3)

Set the transform to map a quadrilateral onto the unit square. When filtering, all coordinates will be scaled by the size of the image.

参数:

x0 - the old position of the top left corner

y0 - the old position of the top left corner

x1 - the old position of the top right corner

y1 - the old position of the top right corner

x2 - the old position of the bottom right corner

y2 - the old position of the bottom right corner

x3 - the old position of the bottom left corner

y3 - the old position of the bottom left corner

filter

public BufferedImage filter(BufferedImage src,
                            BufferedImage dst)

指定者:

filter 在接口中 BufferedImageOp

覆盖:

filter 在类中 TransformFilter

transformSpace

protected void transformSpace(Rectangle rect)

从类复制的说明: TransformFilter

Forward transform a rectangle. Used to determine the size of the output image.

覆盖:

transformSpace 在类中 TransformFilter

参数:

rect - the rectangle to transform

getOriginX

public float getOriginX()

Get the origin of the output image. Use this for working out where to draw your new image.

返回:

the X origin.

getOriginY

public float getOriginY()

Get the origin of the output image. Use this for working out where to draw your new image.

返回:

the Y origin.

getBounds2D

public Rectangle2D getBounds2D(BufferedImage src)

指定者:

getBounds2D 在接口中 BufferedImageOp

覆盖:

getBounds2D 在类中 AbstractBufferedImageOp

getPoint2D

public Point2D getPoint2D(Point2D srcPt,
                          Point2D dstPt)

指定者:

getPoint2D 在接口中 BufferedImageOp

覆盖:

getPoint2D 在类中 AbstractBufferedImageOp

transformInverse

protected void transformInverse(int x,
                                int y,
                                float[] out)

从类复制的说明: TransformFilter

Inverse transform a point. This method needs to be overriden by all subclasses.

指定者:

transformInverse 在类中 TransformFilter

参数:

x - the X position of the pixel in the output image

y - the Y position of the pixel in the output image

out - the position of the pixel in the input image

toString

public String toString()

覆盖:

toString 在类中 Object