def transform_with_touch(self, touch):
# just do a simple one finger drag
if len(self._touches) == 1:
return self._apply_drag(touch)
# we have more than one touch...
points = [Vector(*self._last_touch_pos[t]) for t in self._touches]
# we only want to transform if the touch is part of the two touches
# furthest apart! So first we find anchor, the point to transform
# around as the touch farthest away from touch
anchor = max(points, key=lambda p: p.distance(touch.pos))
# now we find the touch farthest away from anchor, if its not the
# same as touch. Touch is not one of the two touches used to transform
farthest = max(points, key=anchor.distance)
if points.index(farthest) != self._touches.index(touch):
return
# ok, so we have touch, and anchor, so we can actually compute the
# transformation
old_line = Vector(*touch.dpos) - anchor
new_line = Vector(*touch.pos) - anchor
angle = radians(new_line.angle(old_line)) * self._do_rotation
scale = new_line.length() / old_line.length()
new_scale = scale * self.scale
if new_scale < self.scale_min or new_scale > self.scale_max:
scale = 1.0
self.apply_transform(rotation_matrix(angle, (0, 0, 1)), anchor=anchor)
self.apply_transform(scale_matrix(scale), anchor=anchor)
#dispatch on_transform with th touch that caused it
self.dispatch_event('on_transform', touch)
def apply_angle_scale_trans(self, angle, scale, trans, point=Vector(0, 0)):
'''Update matrix transformation by adding new angle, scale and translate.
:Parameters:
`angle` : float
Rotation angle to add
`scale` : float
Scaling value to add
`trans` : Vector
Vector translation to add
`point` : Vector, default to (0, 0)
Point to apply transformation
'''
old_scale = self.scale
new_scale = old_scale * scale
if new_scale < self.scale_min or old_scale > self.scale_max:
scale = 1
t = translation_matrix((trans[0] * self._do_translation_x,
trans[1] * self._do_translation_y, 0))
t = matrix_multiply(t, translation_matrix((point[0], point[1], 0)))
t = matrix_multiply(t, rotation_matrix(angle, (0, 0, 1)))
t = matrix_multiply(t, scale_matrix(scale))
t = matrix_multiply(t, translation_matrix((-point[0], -point[1], 0)))
self.apply_transform(t)
self.dispatch_event('on_transform', None)
def transform_with_touch(self, touch):
# just do a simple one finger drag
if len(self._touches) == 1:
return self._apply_drag(touch)
# we have more than one touch...
points = [Vector(*self._last_touch_pos[t]) for t in self._touches]
# we only want to transform if the touch is part of the two touches
# furthest apart! So first we find anchor, the point to transform
# around as the touch farthest away from touch
anchor = max(points, key=lambda p: p.distance(touch.pos))
# now we find the touch farthest away from anchor, if its not the
# same as touch. Touch is not one of the two touches used to transform
farthest = max(points, key=anchor.distance)
if points.index(farthest) != self._touches.index(touch):
return
# ok, so we have touch, and anchor, so we can actually compute the
# transformation
old_line = Vector(*touch.dpos) - anchor
new_line = Vector(*touch.pos) - anchor
angle = radians( new_line.angle(old_line) ) * self._do_rotation
scale = new_line.length() / old_line.length()
new_scale = scale * self.scale
if new_scale < self.scale_min or new_scale > self.scale_max:
scale = 1.0
self.apply_transform(rotation_matrix(angle, (0, 0, 1)), anchor=anchor)
self.apply_transform(scale_matrix(scale), anchor=anchor)
#dispatch on_transform with th touch that caused it
self.dispatch_event('on_transform', touch)
def apply_angle_scale_trans(self, angle, scale, trans, point=Vector(0, 0)):
'''Update matrix transformation by adding new angle, scale and translate.
:Parameters:
`angle` : float
Rotation angle to add
`scale` : float
Scaling value to add
`trans` : Vector
Vector translation to add
`point` : Vector, default to (0, 0)
Point to apply transformation
'''
old_scale = self.scale
new_scale = old_scale * scale
if new_scale < self.scale_min or old_scale > self.scale_max:
scale = 1
t = translation_matrix((trans[0]*self._do_translation_x, trans[1]*self._do_translation_y, 0))
t = matrix_multiply(t, translation_matrix( (point[0], point[1], 0)))
t = matrix_multiply(t, rotation_matrix(angle, (0, 0, 1)))
t = matrix_multiply(t, scale_matrix(scale))
t = matrix_multiply(t, translation_matrix((-point[0], -point[1], 0)))
self.apply_transform(t)
self.dispatch_event('on_transform', None)
def _set_rotation(self, rotation):
angle_change = self.rotation - rotation
r = rotation_matrix(-radians(angle_change), (0, 0, 1))
self.apply_transform(r,
post_multiply=True,
anchor=self.to_local(*self.center))
def _set_rotation(self, rotation):
angle_change = self.rotation - rotation
r = rotation_matrix(-radians(angle_change), (0, 0, 1))
self.apply_transform(r, post_multiply=True, anchor=self.to_local(*self.center))
