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- #
- # The Python Imaging Library.
- # $Id$
- #
- # transform wrappers
- #
- # History:
- # 2002-04-08 fl Created
- #
- # Copyright (c) 2002 by Secret Labs AB
- # Copyright (c) 2002 by Fredrik Lundh
- #
- # See the README file for information on usage and redistribution.
- #
-
- import Image
-
- class Transform(Image.ImageTransformHandler):
- def __init__(self, data):
- self.data = data
- def getdata(self):
- return self.method, self.data
- def transform(self, size, image, **options):
- # can be overridden
- method, data = self.getdata()
- return image.transform(size, method, data, **options)
-
- ##
- # Define an affine image transform.
- # <p>
- # This function takes a 6-tuple (<i>a, b, c, d, e, f</i>) which
- # contain the first two rows from an affine transform matrix. For
- # each pixel (<i>x, y</i>) in the output image, the new value is
- # taken from a position (a <i>x</i> + b <i>y</i> + c,
- # d <i>x</i> + e <i>y</i> + f) in the input image, rounded to
- # nearest pixel.
- # <p>
- # This function can be used to scale, translate, rotate, and shear the
- # original image.
- #
- # @def AffineTransform(matrix)
- # @param matrix A 6-tuple (<i>a, b, c, d, e, f</i>) containing
- # the first two rows from an affine transform matrix.
- # @see Image#Image.transform
-
- class AffineTransform(Transform):
- method = Image.AFFINE
-
- ##
- # Define a transform to extract a subregion from an image.
- # <p>
- # Maps a rectangle (defined by two corners) from the image to a
- # rectangle of the given size. The resulting image will contain
- # data sampled from between the corners, such that (<i>x0, y0</i>)
- # in the input image will end up at (0,0) in the output image,
- # and (<i>x1, y1</i>) at <i>size</i>.
- # <p>
- # This method can be used to crop, stretch, shrink, or mirror an
- # arbitrary rectangle in the current image. It is slightly slower than
- # <b>crop</b>, but about as fast as a corresponding <b>resize</b>
- # operation.
- #
- # @def ExtentTransform(bbox)
- # @param bbox A 4-tuple (<i>x0, y0, x1, y1</i>) which specifies
- # two points in the input image's coordinate system.
- # @see Image#Image.transform
-
- class ExtentTransform(Transform):
- method = Image.EXTENT
-
- ##
- # Define an quad image transform.
- # <p>
- # Maps a quadrilateral (a region defined by four corners) from the
- # image to a rectangle of the given size.
- #
- # @def QuadTransform(xy)
- # @param xy An 8-tuple (<i>x0, y0, x1, y1, x2, y2, y3, y3</i>) which
- # contain the upper left, lower left, lower right, and upper right
- # corner of the source quadrilateral.
- # @see Image#Image.transform
-
- class QuadTransform(Transform):
- method = Image.QUAD
-
- ##
- # Define an mesh image transform. A mesh transform consists of one
- # or more individual quad transforms.
- #
- # @def MeshTransform(data)
- # @param data A list of (bbox, quad) tuples.
- # @see Image#Image.transform
-
- class MeshTransform(Transform):
- method = Image.MESH
-