我有一个带有画布小部件的 GUI。所以我需要用点来感受这个画布。问题是我需要创建一个单独的进程来运行 GUI，因为(x,y)点是从其他类生成的。所以我不知道如何从外部绘制这些点，paintEvent或者我如何（如有必要）paintEvent再次触发.-。
编辑 ：
我需要运行一个遗传算法，得到每一代的适应度结果，并在画布区域以折线图的形式表示！但我需要即时绘制/绘制结果。
因此，每次 GA 完成一个健身周期时，我都需要将此结果发送到画布区域。
我从http://zetcode.com/tutorials/pyqt4/drawing/获得了这个示例代码并稍作修改！
#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
ZetCode PyQt4 tutorial
In the example, we draw randomly 1000 red points
on the window.
author: Jan Bodnar
website: zetcode.com
last edited: September 2011
"""
import sys, random , time
from multiprocessing import Process
from PyQt4 import QtGui, QtCore
class Example(QtGui.QWidget):
def status( self , text ):
print '[GUI] ', text
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
self.status('init ui')
self.setGeometry(300, 300, 280, 170)
self.setWindowTitle('Points')
self.status('showing widgets')
self.show()
def paintEvent(self, e):
self.status( 'playing with types : '+str(e) )
self.status('paint event was called')
qp = QtGui.QPainter()
qp.begin(self)
#self.drawPoints(qp)
#self.drawRectangles(qp)
self.draw_all_axis(qp, 300)
self.draw_dot( 20, 20 )
qp.end()
def draw_all_axis( self , qp , length ):
self.draw_x_axis( qp , length )
self.draw_y_axis( qp , length )
def draw_x_axis( self , qp , length ):
color = QtGui.QColor(0, 0, 0)
color.setNamedColor('#d49EBD8')
qp.setPen(color)
qp.setBrush(QtGui.QColor(73, 235, 216))
qp.drawLine( 10 , length , length , length )
def draw_y_axis( self , qp , length):
color = QtGui.QColor(0, 0, 0)
color.setNamedColor('#d49EBD8')
qp.setPen(color)
qp.setBrush(QtGui.QColor(73, 235, 216))
qp.drawLine( 10, 10, 10, length )
def draw_dot( self , x , y ):
qp = QtGui.QPainter()
qp.begin(self)
color = QtGui.QColor(0, 0, 0)
color.setNamedColor('#d4d4d4')
qp.setPen(color)
qp.setBrush(QtGui.QColor(200, 0, 0))
qp.drawRect( x , y , x + 0.25, y + 0.25 )
def drawPoints(self, qp):
qp.setPen(QtCore.Qt.red)
size = self.size()
for i in range(1000):
x = random.randint(1, size.width()-1)
y = random.randint(1, size.height()-1)
qp.drawPoint(x, y)
def drawRectangles(self, qp):
color = QtGui.QColor(0, 0, 0)
color.setNamedColor('#d4d4d4')
qp.setPen(color)
qp.setBrush(QtGui.QColor(200, 0, 0))
qp.drawRect(10, 15, 90, 60)
qp.setBrush(QtGui.QColor(255, 80, 0, 160))
qp.drawRect(130, 15, 90, 60)
qp.setBrush(QtGui.QColor(25, 0, 90, 200))
qp.drawRect(250, 15, 90, 60)
def external_dot_drawer( main_window ):
for i in range(20, 100):
main_window.draw_dot( i , i )
def main( ):
print 'launching main window obj as app'
sys.exit(app.exec_())
print 'done!'
if __name__ == '__main__':
print 'loading application abstraction'
app = QtGui.QApplication(sys.argv)
print 'building main window obj'
gui = Example()
print 'preparing to launch window as a separated process'
p_main = Process( name='window' , target=main , args=( ) )
print 'running new process'
p_main.start()
time.sleep(3)
print 'trying to triggering paintEvent'
p_external_dot_drawer = Process( name='extern_dot_drawer' , target=external_dot_drawer , args=( gui ) )