Question

我复制了this script (pasted below)并运行了它。不幸的是，图像出现乱码，如下所示。任何人都可以帮我摆脱它吗？

配置：

Ubuntu 13.10
Pyopengl 3.0.1b1
显卡AMD Radeon HD 6650M

OpenGL版本字符串：3.0 Mesa 10.3.0-devel（git-32c5544 saucy-oibaf-ppa）

from OpenGL.GL import *
from PyQt4 import QtGui
from PyQt4.QtOpenGL import *

    class WfWidget(QGLWidget):
        def __init__(self, parent = None):
            super(WfWidget, self).__init__(parent)

        def paintGL(self):
            glClearColor(0,0,0,0)
            glColor3f(0.0, 0.0, 1.0)
            glRectf(-5, -5, 5, 5)
            glColor3f(1.0, 0.0, 0.0)
            glBegin(GL_LINES)
            glVertex3f(0, 0, 0)
            glVertex3f(20, 20, 0)
            glEnd()

        def resizeGL(self, w, h):
            glMatrixMode(GL_PROJECTION)
            glLoadIdentity()
            glOrtho(-50, 50, -50, 50, -50.0, 50.0)
            glViewport(0, 0, w, h)

        def initializeGL(self):
            glClearColor(0.0, 0.0, 0.0, 1.0)
            glClear(GL_COLOR_BUFFER_BIT)

if __name__ == '__main__':
    app = QtGui.QApplication(["Winfred's PyQt OpenGL"])
    widget = WfWidget()
    widget.show()
    app.exec_()

enter image description here

Answer 1

将glClear移至paint方法：

def paintGL(self):
    glClear(GL_COLOR_BUFFER_BIT)
    glColor3f(0.0, 0.0, 1.0)
    glRectf(-5, -5, 5, 5)
    glColor3f(1.0, 0.0, 0.0)
    glBegin(GL_LINES)
    glVertex3f(0, 0, 0)
    glVertex3f(20, 20, 0)
    glEnd()

同样在这里：

    def initializeGL(self):
        glColor3f(0.0, 0.0, 1.0)

这里你不需要glClear。生产：

enter image description here

无法清除OpenGL视口

1 个答案: