Python绘制渐变色三角形

本文要点在于Python扩展库pyopengl的应用，关于OpenGL函数参数含义可以查阅有关资料。

import sys

from OpenGL.GL import *

from OpenGL.GLUT import *

from OpenGL.GLU import *

class MyPyOpenGLTest:

def __init__(self, width = 640, height = 480, title = b'OpenGL--gradient color'):

glutInit(sys.argv)

glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)

glutInitWindowSize(width, height)

self.window = glutCreateWindow(title)

self.InitGL(width, height)

glutDisplayFunc(self.Draw)

glutIdleFunc(self.Draw)

#绘图方法

def Draw(self):

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

glLoadIdentity()

#平移

glTranslatef(-2.0, 0.0, -8.0)

#绘制二维多边形

glBegin(GL_POLYGON)

glColor3f(1.0, 0.0, 0.0)

glVertex3f(0.0, 3.0, 0.0)

glColor3f(0.0, 1.0, 0.0)

glVertex3f(2.0, -2.0, 0.0)

glColor3f(0.0, 0.0, 1.0)

glVertex3f(-2.0, -2.0, 0.0)

glEnd()

#平移

glTranslatef(3.5, 1.5, 0.0)

#缩放

glScale(0.5, 0.5, 0.5)

#绘制二维多边形

glBegin(GL_POLYGON)

glColor3f(1.0, 1.0, 0.0)

glVertex3f(0.0, 3.0, 0.0)

glColor3f(0.0, 1.0, 1.0)

glVertex3f(2.0, -2.0, 0.0)

glColor3f(1.0, 0.0, 1.0)

glVertex3f(-2.0, -2.0, 0.0)

glEnd()

glTranslatef(0.0, -4.0, 0.0)

glScale(0.5, 0.5, 0.5)

#绕z轴旋转45度

glRotatef(45.0, 0.0, 0, 1)

#绘制二维多边形

glBegin(GL_POLYGON)

glColor3f(0, 1.0, 0.5)

glVertex3f(0.0, 3.0, 0.0)

glColor3f(0.5, 1.0, 0.0)

glVertex3f(2.0, -2.0, 0.0)

glColor3f(1.0, 0.0, 0.5)

glVertex3f(-2.0, -2.0, 0.0)

glEnd()

glutSwapBuffers()

def InitGL(self, width, height):

glClearColor(1.0, 1.0, 1.0, 0.0)

glClearDepth(1.0)

glDepthFunc(GL_LESS)

#单色渲染

#glShadeModel(GL_FLAT)

#平滑渲染模式

glShadeModel(GL_SMOOTH)

glEnable(GL_POINT_SMOOTH)

glEnable(GL_LINE_SMOOTH)

glEnable(GL_POLYGON_SMOOTH)

glHint(GL_POINT_SMOOTH_HINT,GL_NICEST)

glHint(GL_LINE_SMOOTH_HINT,GL_NICEST)

glHint(GL_POLYGON_SMOOTH_HINT,GL_FASTEST)

glMatrixMode(GL_PROJECTION)

glLoadIdentity()

gluPerspective(45.0, float(width)/float(height), 0.1, 100.0)

glMatrixMode(GL_MODELVIEW)

def MainLoop(self):

glutMainLoop()

if __name__ == '__main__':

w = MyPyOpenGLTest()

w.MainLoop()

运行效果如图：