#-*- coding:utf8 -*-
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import math
QTextCodec.setCodecForTr(QTextCodec.codecForName("utf-8"))
class PixItem(QGraphicsItem):
def __init__(self,QPixmap):
super(PixItem,self).__init__()
self.pix = QPixmap
def boundingRect(self):
return QRectF(-2 - self.pix.width()/2,-2 - self.pix.height()/2,self.pix.width() + 4,self.pix.height() + 4)
def paint(self,painter,option,widget):
painter.drawPixmap(-self.pix.width()/2,-self.pix.height()/2,self.pix)
class MainWidget(QWidget):
def __init__(self):
super(MainWidget,self).__init__()
self.angle = 0
self.scale = 5
self.shear = 5
self.translate =50
self.scene = QGraphicsScene()
self.scene.setSceneRect(-200,-200,400,400)
self.pixmap = QPixmap("image/butterfly.png")
self.item = PixItem(self.pixmap)
self.scene.addItem(self.item)
self.item.setPos(0,0)
self.view = QGraphicsView()
self.view.setScene(self.scene)
self.view.setMinimumSize(400,400)
self.ctrlFrame = QFrame()
self.createControllFrame()
self.rightlayout = QVBoxLayout()
self.rightlayout.addWidget(self.rotateGroup)
self.rightlayout.addWidget(self.scaleGroup)
self.rightlayout.addWidget(self.shearGroup)
self.rightlayout.addWidget(self.translateGroup)
self.leftlayout = QHBoxLayout()
self.leftlayout.addWidget(self.view)
self.leftlayout.addWidget(self.ctrlFrame)
self.mainlayout = QHBoxLayout()
self.mainlayout.addLayout(self.leftlayout)
self.mainlayout.addLayout(self.rightlayout)
self.setLayout(self.mainlayout)
self.setWindowTitle(self.tr("Graphics Item 的各种变形"))
def createControllFrame(self):
self.rotateGroup = QGroupBox(self.tr("旋转"))
rotateSlider = QSlider()
rotateSlider.setOrientation(Qt.Horizontal)
rotateSlider.setRange(0,360)
self.connect(rotateSlider,SIGNAL("valueChanged(int)"),self.slotRotate)
rotateLayout = QHBoxLayout()
rotateLayout.addWidget(rotateSlider)
self.rotateGroup.setLayout(rotateLayout)
self.scaleGroup = QGroupBox(self.tr("缩放"))
scaleSlider = QSlider()
scaleSlider.setOrientation(Qt.Horizontal)
self.connect(scaleSlider,SIGNAL("valueChanged(int)"),self.slotScale)
scaleLayout = QHBoxLayout()
scaleLayout.addWidget(scaleSlider)
self.scaleGroup.setLayout(scaleLayout)
self.shearGroup = QGroupBox(self.tr("切变"))
shearSlider = QSlider()
shearSlider.setOrientation(Qt.Horizontal)
self.connect(shearSlider,SIGNAL("valueChanged(int)"),self.slotShear)
shearLayout = QHBoxLayout()
shearLayout.addWidget(shearSlider)
self.shearGroup.setLayout(shearLayout)
self.translateGroup = QGroupBox(self.tr("位移"))
translateSlider = QSlider()
translateSlider.setOrientation(Qt.Horizontal)
self.connect(translateSlider,SIGNAL("valueChanged(int)"),self.slotTranslate)
translateLayout = QHBoxLayout()
translateLayout.addWidget(translateSlider)
self.translateGroup.setLayout(translateLayout)
def slotRotate(self,value):
self.item.rotate(value - self.angle)
self.angle = value
def slotScale(self,value):
if value > self.scale:
s = math.pow(1.1,(value - self.scale))
else:
s = math.pow(1/1.1,(self.scale - value))
self.item.scale(s,s)
self.scale = value
def slotShear(self,value):
self.item.shear((value - self.shear)/10.0,0)
self.shear = value
def slotTranslate(self,value):
self.item.translate(value - self.translate,value - self.translate)
self.translate = value
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
mainwindow = MainWidget()
mainwindow.show()
sys.exit(app.exec_())
