class TransformMixin(object):
"""Mixin class for transformation support.
Adds the _transform and _transformmode attributes to the class."""
transform = None
def __init__(self):
self._reset()
def _reset(self):
self.transform = Transform()
self._transformmode = 'center'
def _get_transformmode(self):
return self._transformmode
def _set_transformmode(self, mode):
self._transformmode = mode
transformmode = property(_get_transformmode, _set_transformmode)
def translate(self, x, y):
self.transform.translate(x, y)
def reset(self):
self.transform = Transform()
def rotate(self, degrees=0, radians=0):
if self._transformmode == 'corner':
deltax, deltay = self._transform.transformPoint((0, 0))
elif self._transformmode == 'center':
deltax, deltay = self._transform.transformPoint(self.center)
if degrees:
C = math.cos((math.pi/180.0)*degrees)
S = math.sin((math.pi/180.0)*degrees)
self.transform *= Transform(C, S, -S, C, deltax-(C*deltax)+(S*deltay),deltay-(S*deltax)-(C*deltay))
def translate(self, x=0, y=0):
self.transform *= Transform(dx=x, dy=y)
def scale(self, x=1, y=None):
self.transform.scale(x,y)
def skew(self, x=0, y=0):
self.transform.skew(x,y)
def point(self, point):
return self.transform.transformPoint(point)
def matrix_with_center(self):
pass
def reset(self):
self.transform = Transform()
def _reset(self):
self.transform = Transform()
self._transformmode = 'center'
