Question

我正在尝试实现一个单击并拖动时移动的相机。它使用glutMouseFunc来注册鼠标点击，这只是：

def on_click(self, button, state, x, y):
        if button == GLUT_LEFT_BUTTON:
            if state == GLUT_DOWN:
                self.dragging = True
                self.drag_x_origin = x
                self.drag_y_origin = y
            else:
                self.dragging = False

在glutPassiveMotionFunc中它有：

 def mouse_movement(self, x, y):
        print "----------------------"
        if self.dragging:
            print "+++++++++++"

此时应该打印“++++++++++++++++++++++++++++++++++++++++++++++++它锁定了。当我运行该程序时，我得到一个无休止的系列“----------------------”，直到我点击，然后它就停止了。我在显示功能中打印，仍然有效，但由于某种原因，此功能锁定。谁能明白为什么？

大部分完整的代码：

class Camera():
    def __init__(self):
        self.camera_angle_horizontal = 1.0
        self.camera_angle_vertical = 1.0
        self.drag_x_origin = 0.0
        self.drag_y_origin = 0.0
        self.dragging = False

        glutInit(sys.argv)
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
        glutInitWindowSize(500, 500)
        glutInitWindowPosition(100, 100)
        glutCreateWindow('cube')
        self.init()
        glutMouseFunc(self.on_click)
        glutPassiveMotionFunc(self.mouse_movement)
        glutDisplayFunc(self.display)
        glutReshapeFunc(self.reshape)
        glutKeyboardFunc(self.keyboard)
        glutMainLoop()

    def init(self):
        glClearColor(0.0, 0.0, 0.0, 0.0)
        glShadeModel(GL_FLAT)

    def display(self):
        print self.dragging, self.camera_angle_vertical, self.camera_angle_horizontal
        ...
        glutPostRedisplay()

    def reshape(self, w, h):
        glViewport(0, 0, w, h)
        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()
        gluPerspective(40.0, w / h, 1.0, 20.0)
        #glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 20.0)
        glMatrixMode(GL_MODELVIEW)

    def on_click(self, button, state, x, y):
        if button == GLUT_LEFT_BUTTON:
            if state == GLUT_DOWN:
                self.dragging = True
            else:
                self.dragging = False

    def mouse_movement(self, x, y):
        print "----------------------"
        if self.dragging:
            print "+++++++++++"

c = Camera()

Answer 1

当我应该只使用glutPassiveMotionFunc(self.mouse_movement)

时，我正在使用gluteMotionFunc(self.mouse_movement)

Python Opengl鼠标点击时冻结

1 个答案: