Glade Reference


transform64

The transform64 class contains functions to transform coordinates in subcells placed with offset, rotation and magnification. It differs from the transform class in that internally it uses double precision for the matrix elements, allowing any angle rotation and non-integer scaling. Note that all coordinates after transform are converted to integer database units; no grid snapping is performed.

All of this code is based on the fact that a point with coordinates x, y can be transformed by a transformation matrix T by:

[x', y', 1] = [x, y, 1]T

The transformation matrix for an offset (a,b) with no rotation or magnification can be described as

T = [ 1 0 0 ]
[ 0 1 0 ]
[ a b 1 ]

Rotations are e.g.

T90 = [ 0 1 0 ]
[ -1 0 0 ]
[ 0 0 1 ]

trans = transform64(double angle, Point p, float scale)

Construct a transform with orientation angle, origin p and magnification scale . The orientation is specified in degrees.

 

trans = transform64(double angle, Point p)

trans = transform64(double angle, int x, int y)

Construct a transform with orientation angle, origin p or x/y.The orientation is specified in degrees.

 

trans = transform64(double angle, int x, int y, float scale)

Construct a transform with orientation angle, origin p and magnification scale . The orientation is specified in degrees.

 

trans = transform64(double angle)

Construct a transform with orientation angle.

 

trans = transform64()

Construct a transform with orientation R0.

 

trans.invert()

Invert a transformation matrix

 

trans.inverseTransformRect(Rect box)

Transform a Rect by the inverse of the transformation matrix. Useful if you want to take a Rect and transform it into the coordinate space of an instance with a transform. For example if you want to find if any shapes in an instance overlap a search box for a top level cell, use the inverse transform of the search box on all the instance's shapes. This means doing just one transform of the search box rather than one transform for each shape in the instance.

 

trans.inverseTransformPoint(Point p)

trans.inverseTransformPoint(int x, int y)

Transform a Point by the inverse of the transformation matrix

 

trans.transformRect(Rect box)

Transform a Rect by the transformation matrix

 

trans.transformRect(Rect box, Point origin)

Transform a Rect by the transformation matrix about a point origin.

 

trans.transformPoint(Point p)

Transform a Point by the transformation matrix

 

trans.transformPoint(Point p, Point origin)

Transform a point by the transformation matrix about a point origin.

 

trans.transformPointList(Point *ptlist, int size)

Transform an array of points of size size by the transformation matrix.

 

trans.transformPointList(Point *ptlist, int size, Point origin)

Transform an array of points of size size by the transformation matrix about a point origin.

 

trans.setOrigin(Point p)

trans.setOrigin(int x, int y)

Set the transformation origin.

 

Point origin = trans.getOrigin()

Get the transformation origin.

 

trans.setMag(float scale)

Set the transformation matrix scale.

 

trans.setOrient(double angle)

Set the transformation angle. Any existing scale will be reset to 1.0

 

bool swapped = trans.isXYSwapped()

Returns True if the transformation is such that the objects XY coordinates would be swapped, e,g, if the object is R90.

 

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