def test_invert(self):
""" An matrix times its inverse should produce the identity matrix
"""
a, b, c, d, tx, ty = 1, 2, 3, 4, 5, 6
transform1 = affine.affine_from_values(a, b, c, d, tx, ty)
transform2 = affine.invert(transform1)
desired = affine.affine_identity()
actual = dot(transform2, transform1)
assert (alltrue((ravel(actual) - ravel(desired)) < 1e-6))
def test_invert(self):
""" An matrix times its inverse should produce the identity matrix
"""
a,b,c,d,tx,ty = 1,2,3,4,5,6
transform1 = affine.affine_from_values(a,b,c,d,tx,ty)
transform2 = affine.invert(transform1)
desired = affine.affine_identity()
actual = dot(transform2,transform1)
assert(alltrue( (ravel(actual) - ravel(desired)) < 1e-6 ))
def set_ctm(self, transform):
""" Set the coordinate transform matrix
"""
# We have to do this by inverting the current state to zero it out,
# then transform by desired transform, as Reportlab Canvas doesn't
# provide a method to directly set the ctm.
current = self.get_ctm()
self.concat_ctm(affine.invert(current))
self.concat_ctm(transform)
def set_ctm(self, transform):
""" Set the coordinate transform matrix
"""
# We have to do this by inverting the current state to zero it out,
# then transform by desired transform, as Reportlab Canvas doesn't
# provide a method to directly set the ctm.
current = self.get_ctm()
self.concat_ctm(affine.invert(current))
self.concat_ctm(transform)
def test_handling_text(gc):
font = Font(face_name="Arial", size=32)
gc.set_font(font)
gc.translate_ctm(100.0, 100.0)
gc.move_to(-5, 0)
gc.line_to(5, 0)
gc.move_to(0, 5)
gc.line_to(0, -5)
gc.move_to(0, 0)
gc.stroke_path()
txtRot = affine.affine_from_rotation(PI / 6)
gc.set_text_matrix(txtRot)
gc.show_text("Hello")
txtRot = affine.invert(txtRot)
gc.set_text_matrix(txtRot)
gc.show_text("inverted")
def test_handling_text(gc):
font = Font(face_name="Arial", size = 32)
gc.set_font(font)
gc.translate_ctm(100.0, 100.0)
gc.move_to(-5,0)
gc.line_to(5,0)
gc.move_to(0,5)
gc.line_to(0,-5)
gc.move_to(0,0)
gc.stroke_path()
txtRot = affine.affine_from_rotation(PI/6)
gc.set_text_matrix(txtRot)
gc.show_text("Hello")
txtRot = affine.invert(txtRot)
gc.set_text_matrix(txtRot)
gc.show_text("inverted")
