Article Outline
Python pyqt (gui) example 'textures'
Modules used in program:
import sys
textures
Python pyqt example: textures
#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2015 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
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## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
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## the names of its contributors may be used to endorse or promote
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## $QT_END_LICENSE$
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#############################################################################
import sys
from PyQt5.QtCore import pyqtSignal, QFileInfo, QPoint, QSize, Qt, QTimer
from PyQt5.QtGui import (QColor, QImage, QMatrix4x4, QOpenGLShader,
QOpenGLShaderProgram, QOpenGLTexture, QSurfaceFormat)
from PyQt5.QtWidgets import QApplication, QGridLayout, QOpenGLWidget, QWidget
class GLWidget(QOpenGLWidget):
clicked = pyqtSignal()
PROGRAM_VERTEX_ATTRIBUTE, PROGRAM_TEXCOORD_ATTRIBUTE = range(2)
vsrc = """
attribute highp vec4 vertex;
attribute mediump vec4 texCoord;
varying mediump vec4 texc;
uniform mediump mat4 matrix;
void main(void)
{
gl_Position = matrix * vertex;
texc = texCoord;
}
"""
fsrc = """
uniform sampler2D texture;
varying mediump vec4 texc;
void main(void)
{
gl_FragColor = texture2D(texture, texc.st);
}
"""
coords = (
(( +1, -1, -1 ), ( -1, -1, -1 ), ( -1, +1, -1 ), ( +1, +1, -1 )),
(( +1, +1, -1 ), ( -1, +1, -1 ), ( -1, +1, +1 ), ( +1, +1, +1 )),
(( +1, -1, +1 ), ( +1, -1, -1 ), ( +1, +1, -1 ), ( +1, +1, +1 )),
(( -1, -1, -1 ), ( -1, -1, +1 ), ( -1, +1, +1 ), ( -1, +1, -1 )),
(( +1, -1, +1 ), ( -1, -1, +1 ), ( -1, -1, -1 ), ( +1, -1, -1 )),
(( -1, -1, +1 ), ( +1, -1, +1 ), ( +1, +1, +1 ), ( -1, +1, +1 ))
)
def __init__(self, parent=None):
super(GLWidget, self).__init__(parent)
self.clearColor = QColor(Qt.black)
self.xRot = 0
self.yRot = 0
self.zRot = 0
self.program = None
self.lastPos = QPoint()
def minimumSizeHint(self):
return QSize(50, 50)
def sizeHint(self):
return QSize(200, 200)
def rotateBy(self, xAngle, yAngle, zAngle):
self.xRot += xAngle
self.yRot += yAngle
self.zRot += zAngle
self.update()
def setClearColor(self, color):
self.clearColor = color
self.update()
def initializeGL(self):
self.gl = self.context().versionFunctions()
self.gl.initializeOpenGLFunctions()
self.makeObject()
self.gl.glEnable(self.gl.GL_DEPTH_TEST)
self.gl.glEnable(self.gl.GL_CULL_FACE)
vshader = QOpenGLShader(QOpenGLShader.Vertex, self)
vshader.compileSourceCode(self.vsrc)
fshader = QOpenGLShader(QOpenGLShader.Fragment, self)
fshader.compileSourceCode(self.fsrc)
self.program = QOpenGLShaderProgram()
self.program.addShader(vshader)
self.program.addShader(fshader)
self.program.bindAttributeLocation('vertex',
self.PROGRAM_VERTEX_ATTRIBUTE)
self.program.bindAttributeLocation('texCoord',
self.PROGRAM_TEXCOORD_ATTRIBUTE)
self.program.link()
self.program.bind()
self.program.setUniformValue('texture', 0)
self.program.enableAttributeArray(self.PROGRAM_VERTEX_ATTRIBUTE)
self.program.enableAttributeArray(self.PROGRAM_TEXCOORD_ATTRIBUTE)
self.program.setAttributeArray(self.PROGRAM_VERTEX_ATTRIBUTE,
self.vertices)
self.program.setAttributeArray(self.PROGRAM_TEXCOORD_ATTRIBUTE,
self.texCoords)
def paintGL(self):
self.gl.glClearColor(self.clearColor.redF(), self.clearColor.greenF(),
self.clearColor.blueF(), self.clearColor.alphaF())
self.gl.glClear(
self.gl.GL_COLOR_BUFFER_BIT | self.gl.GL_DEPTH_BUFFER_BIT)
m = QMatrix4x4()
m.ortho(-0.5, 0.5, 0.5, -0.5, 4.0, 15.0)
m.translate(0.0, 0.0, -10.0)
m.rotate(self.xRot / 16.0, 1.0, 0.0, 0.0)
m.rotate(self.yRot / 16.0, 0.0, 1.0, 0.0)
m.rotate(self.zRot / 16.0, 0.0, 0.0, 1.0)
self.program.setUniformValue('matrix', m)
for i, texture in enumerate(self.textures):
texture.bind()
self.gl.glDrawArrays(self.gl.GL_TRIANGLE_FAN, i * 4, 4)
def resizeGL(self, width, height):
side = min(width, height)
self.gl.glViewport((width - side) // 2, (height - side) // 2, side,
side)
def mousePressEvent(self, event):
self.lastPos = event.pos()
def mouseMoveEvent(self, event):
dx = event.x() - self.lastPos.x()
dy = event.y() - self.lastPos.y()
if event.buttons() & Qt.LeftButton:
self.rotateBy(8 * dy, 8 * dx, 0)
elif event.buttons() & Qt.RightButton:
self.rotateBy(8 * dy, 0, 8 * dx)
self.lastPos = event.pos()
def mouseReleaseEvent(self, event):
self.clicked.emit()
def makeObject(self):
self.textures = []
self.texCoords = []
self.vertices = []
root = QFileInfo(__file__).absolutePath()
for i in range(6):
self.textures.append(
QOpenGLTexture(
QImage(root + ('/images/side%d.png' % (i + 1))).mirrored()))
for j in range(4):
self.texCoords.append(((j == 0 or j == 3), (j == 0 or j == 1)))
x, y, z = self.coords[i][j]
self.vertices.append((0.2 * x, 0.2 * y, 0.2 * z))
class Window(QWidget):
NumRows = 2
NumColumns = 3
def __init__(self):
super(Window, self).__init__()
self.glWidgets = []
mainLayout = QGridLayout()
for i in range(Window.NumRows):
row = []
for j in range(Window.NumColumns):
clearColor = QColor()
clearColor.setHsv(((i * Window.NumColumns) + j) * 255
/ (Window.NumRows * Window.NumColumns - 1),
255, 63)
widget = GLWidget()
widget.setClearColor(clearColor)
widget.rotateBy(+42 * 16, +42 * 16, -21 * 16)
mainLayout.addWidget(widget, i, j)
widget.clicked.connect(self.setCurrentGlWidget)
row.append(widget)
self.glWidgets.append(row)
self.setLayout(mainLayout)
self.currentGlWidget = self.glWidgets[0][0]
timer = QTimer(self)
timer.timeout.connect(self.rotateOneStep)
timer.start(20)
self.setWindowTitle("Textures")
def setCurrentGlWidget(self):
self.currentGlWidget = self.sender()
def rotateOneStep(self):
if self.currentGlWidget:
self.currentGlWidget.rotateBy(+2 * 16, +2 * 16, -1 * 16)
if __name__ == '__main__':
app = QApplication(sys.argv)
format = QSurfaceFormat()
format.setDepthBufferSize(24)
QSurfaceFormat.setDefaultFormat(format)
window = Window()
window.show()
sys.exit(app.exec_())
Useful links
- Learn PyQt: https://pythonbasics.org/pyqt-hello-world/
- Install PyQt: https://pythonbasics.org/install-pyqt/