diff options
Diffstat (limited to 'share/extensions/simpletransform.py')
| -rw-r--r--[-rwxr-xr-x] | share/extensions/simpletransform.py | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/share/extensions/simpletransform.py b/share/extensions/simpletransform.py index 47cc61ec8..8b6f46935 100755..100644 --- a/share/extensions/simpletransform.py +++ b/share/extensions/simpletransform.py @@ -1,4 +1,3 @@ -#!/usr/bin/env python ''' Copyright (C) 2006 Jean-Francois Barraud, barraud@math.univ-lille1.fr Copyright (C) 2010 Alvin Penner, penner@vaxxine.com @@ -79,6 +78,21 @@ def parseTransform(transf,mat=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]): def formatTransform(mat): return ("matrix(%f,%f,%f,%f,%f,%f)" % (mat[0][0], mat[1][0], mat[0][1], mat[1][1], mat[0][2], mat[1][2])) +def invertTransform(mat): + det = mat[0][0]*mat[1][1] - mat[0][1]*mat[1][0] + if det !=0: # det is 0 only in case of 0 scaling + # invert the rotation/scaling part + a11 = mat[1][1]/det + a12 = -mat[0][1]/det + a21 = -mat[1][0]/det + a22 = mat[0][0]/det + # invert the translational part + a13 = -(a11*mat[0][2] + a12*mat[1][2]) + a23 = -(a21*mat[0][2] + a22*mat[1][2]) + return [[a11,a12,a13],[a21,a22,a23]] + else: + return[[0,0,-mat[0][2]],[0,0,-mat[1][2]]] + def composeTransform(M1,M2): a11 = M1[0][0]*M2[0][0] + M1[0][1]*M2[1][0] a12 = M1[0][0]*M2[0][1] + M1[0][1]*M2[1][1] @@ -238,4 +252,10 @@ def computeBBox(aList,mat=[[1,0,0],[0,1,0]]): return bbox +def computePointInNode(pt, node, mat=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]): + if node.getparent() is not None: + applyTransformToPoint(invertTransform(composeParents(node, mat)), pt) + return pt + + # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99 |