edit_armature.py 文件源码

def drag_bone(self,context, event ,bone=None):
        ### math.atan2(0.5, 0.5)*180/math.pi
        if bone != None:

            bone.hide = False
            mouse_vec_norm = (self.cursor_location - self.mouse_click_vec).normalized()
            mouse_vec = (self.cursor_location - self.mouse_click_vec)
            angle = (math.atan2(mouse_vec_norm[0], mouse_vec_norm[2])*180/math.pi)
            cursor_local = self.armature.matrix_world.inverted() * self.cursor_location
            cursor_local[1] = 0
            if event.shift:
                if angle > -22.5 and angle < 22.5:
                    ### up
                    bone.tail =  Vector((bone.head[0],cursor_local[1],cursor_local[2]))
                elif angle > 22.5 and angle < 67.5:
                    ### up right
                    bone.tail = (bone.head +  Vector((mouse_vec[0],0,mouse_vec[0])))
                elif angle > 67.5 and angle < 112.5:
                    ### right
                    bone.tail = Vector((cursor_local[0],cursor_local[1],bone.head[2]))
                elif angle > 112.5 and angle < 157.5:
                    ### down right
                    bone.tail = (bone.head +  Vector((mouse_vec[0],0,-mouse_vec[0])))
                elif angle > 157.5 or angle < -157.5:   
                    ### down
                    bone.tail = Vector((bone.head[0],cursor_local[1],cursor_local[2]))
                elif angle > -157.5 and angle < -112.5:
                    ### down left
                        bone.tail = (bone.head +  Vector((mouse_vec[0],0,mouse_vec[0])))
                elif angle > -112.5 and angle < -67.5:
                    ### left
                    bone.tail = Vector((cursor_local[0],cursor_local[1],bone.head[2]))
                elif angle > -67.5 and angle < -22.5:       
                    ### left up
                    bone.tail = (bone.head +  Vector((mouse_vec[0],0,-mouse_vec[0])))
            else:
                bone.tail = cursor_local