def __mouse2sphere(self, x, y):
"""
private map mouse to ArcBall (sphere)
"""
v = PVector()
v.x = (x - self.center_x) / self.radius
v.y = (y - self.center_y) / self.radius
mag = v.x * v.x + v.y * v.y
if mag > 1.0:
v.normalize()
else:
v.z = sqrt(1.0 - mag)
return v if (self.axis == -1) else (self.__constrain(v, self.axisSet[self.axis]))
def __mouse2sphere(self, x, y):
"""
private map mouse to ArcBall (sphere)
"""
v = PVector()
v.x = (x - self.center_x) / self.radius
v.y = (y - self.center_y) / self.radius
mag = v.x * v.x + v.y * v.y
if (mag > 1.0):
v.normalize()
else:
v.z = sqrt(1.0 - mag)
if (self.axis != -1):
v = self.__constrain(v, self.axis_set[self.axis])
return v
