一直想在PyQt中找一个能显示有限元2D云图的部件，可惜QLinearGradient类只能使颜色在两个点之间插值变化，3个或以上点时则无能为力。还好我们可以使用PyOpenGL。
PyOpenGL下载链接如下：https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyopengl
不推荐使用Pip下载，因为Pip下载的64位版本缺少某些库文件，会报错。
本程序将OpenGL渲染的图形窗口嵌入到PyQt5窗口部件中，显示了两个彩色多边形，多边形内部颜色由顶点颜色插值而来。
代码如下：
代码语言：javascript复制import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtOpenGL import QGLWidget
from OpenGL import GL
class GLWidget(QGLWidget):
def __init__(self, parent =None):
super(GLWidget, self).__init__(parent)
def initializeGL(self):
self.qglClearColor(QColor(0,0,0))
#GL.glClearDepth(1.0)# Enables Clearing Of The Depth Buffer
GL.glShadeModel(GL.GL_SMOOTH) #!颜色平滑渲染
#GL.glDepthFunc(GL.GL_LESS) # The Type Of Depth Test To Do
#GL.glEnable(GL.GL_DEPTH_TEST)
self.object = self.makeObject()
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glLoadIdentity()# Reset The Projection Matrix
#GL.glTranslatef(0, 0.0, 0)#平移
#GL.glRotated(0.5, 1.0, 0.0, 0.0)#旋转
GL.glCallList(self.object)
def resizeGL(self, width, height):
side = min(width, height)
GL.glViewport((width - side) // 2, (height - side) // 2, side, side)#保持图形的长宽比
#GL.glViewport(50,50,500,500)
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()# Reset The Projection Matrix
#GL.glOrtho(-0.5, 0.5, 0.5, -0.5, 4.0, 15.0)
GL.glMatrixMode(GL.GL_MODELVIEW)
def makeObject(self):
genList = GL.glGenLists(1)
GL.glNewList(genList, GL.GL_COMPILE)
# Since we have smooth color mode on, this will be great for the Phish Heads :-).
'''
# Draw a triangle in 3D space
GL.glBegin(GL.GL_POLYGON)
# Start drawing a polygon
GL.glColor3f(1.0, 0.0, 0.0) # Red
GL.glVertex3f(0.0, 1.0, 0) # Top
GL.glColor3f(0.0, 1.0, 0.0) # Green
GL.glVertex3f(1.0, -1.0, 0.0) # Bottom Right
GL.glColor3f(0.0, 0.0, 1.0) # Blue
GL.glVertex3f(-1.0, -1.0, 0.0) # Bottom Left
GL.glEnd()
'''
# Draw a 2d triangle
GL.glBegin(GL.GL_POLYGON)# Start drawing a polygon
GL.glColor3f(1.0, 0.0, 0.0) #R,G,B color
GL.glVertex2f(0, 0.5)
GL.glColor3f(0.0, 1.0, 0.0)
GL.glVertex2f(-0.5, 0)
GL.glColor3f(0.0, 0.0, 1.0)
GL.glVertex2f(0.5,0)
GL.glEnd()
# Draw a 2d triangle
GL.glBegin(GL.GL_POLYGON)# Start drawing a polygon
GL.glColor3f(1.0, 0.0, 0.0)
GL.glVertex2f(0, 0.5)
GL.glColor3f(0.0, 0.0, 1.0)
GL.glVertex2f(0.5,0)
GL.glColor3f(0.5, 0.0, 0.5)
GL.glVertex2f(0.9, 0.2)
GL.glColor3f(0.0, 1.0, 0.0)
GL.glVertex2f(1.0, 1.0) #1.0, 1.0代表视口的左上角点，0,0代表中心点
GL.glEnd()
GL.glEndList()
return genList
def minimumSizeHint(self):
return QSize(100, 100)
#def sizeHint(self):
#return QSize(800, 800)
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setCentralWidget(GLWidget())
self.setWindowTitle("OpenGL example")
self.resize(800, 800)
if __name__ == '__main__':
app = QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_()) 
