def makeInverseMatrix(self, grid):
# first apply a negative translation by the rotCenter
# then apply the rotation
# then reverse the rotCenter
centerVec = bdggeom.Vec2f(*grid.indexToWorld(*self.rotCenterIndices))
rotRad = 2 * math.pi / self.rotCount
negTrans = bdggeom.makeTranslationMatrix(-centerVec.x, -centerVec.y)
posTrans = bdggeom.makeTranslationMatrix(centerVec.x, centerVec.y)
rotTrans = bdggeom.makeRotationMatrix(-rotRad)
return posTrans.mulMat(rotTrans.mulMat(negTrans))
def appendTranslation(self, dx, dy):
self.transformMatrix = bdggeom.makeTranslationMatrix(dx, dy).mulMat(
self.transformMatrix)
def appendTranslation(self, dx, dy):
trans = bdggeom.makeTranslationMatrix(dx, dy)
self.gridToWorldTransform = trans.mulMat(self.gridToWorldTransform)
invTrans = bdggeom.makeTranslationMatrix(-dx, -dy)
self.worldToGridTransform = self.worldToGridTransform.mulMat(invTrans)
def makeInverseMatrix(self, grid):
offsetVec = bdggeom.Vec2f(*grid.indexToWorld(*self.offset))
return bdggeom.makeTranslationMatrix(-offsetVec.x, -offsetVec.y)