這個例子我做了好幾天：

1）官網C++的源碼，改寫成PyQt5版本的代碼，好多細節不會轉化

2）網上的PyQt的例子根本運行不了

填了無數個坑，結合二者，終于能完成了一個關于繪圖的東西。這個過程也掌握了很多新的知識點

【知識點】

1、關于多個點的使用

poitns = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]

請看：

1 # 定義多個點 2 points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)] 3 4 # ===直接使用 points 會報錯！========= 5 # ... 6 elif self.shape == self.Points: 7 painter.drawPoints(points) 8 9 elif self.shape == self.Polyline: 10 painter.drawPolyline(points) 11 12 elif self.shape == self.Polygon: 13 painter.drawPolygon(points, 4) 14 15 # ... 16 17 # ===把 points 用 QPolygon()包裹起來才正確！========= 18 # ... 19 elif self.shape == self.Points: 20 painter.drawPoints(QPolygon(points)) 21 22 elif self.shape == self.Polyline: 23 painter.drawPolyline(QPolygon(points)) 24 25 elif self.shape == self.Polygon: 26 painter.drawPolygon(QPolygon(points), 4) 27 28 # ...

2、在QDialog窗體中顯示QWidget部件

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【效果圖】

【資源】

http://doc.qt.io/qt-5/images/used-in-examples/painting/basicdrawing/images/brick.png

http://doc.qt.io/qt-5/images/used-in-examples/painting/basicdrawing/images/qt-logo.png

【代碼】

import sysfrom PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import *class StockDialog(QWidget):def __init__(self, parent=None):super(StockDialog, self).__init__(parent)self.setWindowTitle("利用QPainter繪制各種圖形")mainSplitter = QSplitter(Qt.Horizontal)mainSplitter.setOpaqueResize(True)frame = QFrame(mainSplitter)mainLayout = QGridLayout(frame)#mainLayout.setMargin(10)mainLayout.setSpacing(6)label1=QLabel("形狀：")label2=QLabel("畫筆線寬：")label3=QLabel("畫筆顏色：")label4=QLabel("畫筆風格：")label5=QLabel("畫筆頂端：")label6=QLabel("畫筆連接點：")label7=QLabel("畫刷風格：")label8=QLabel("畫刷顏色：")self.shapeComboBox = QComboBox()self.shapeComboBox.addItem("Line", "Line")self.shapeComboBox.addItem("Rectangle", "Rectangle")self.shapeComboBox.addItem('Rounded Rectangle','Rounded Rectangle')self.shapeComboBox.addItem('Ellipse','Ellipse')self.shapeComboBox.addItem('Pie','Pie')self.shapeComboBox.addItem('Chord','Chord')self.shapeComboBox.addItem('Path','Path')self.shapeComboBox.addItem('Polygon','Polygon')self.shapeComboBox.addItem('Polyline','Polyline')self.shapeComboBox.addItem('Arc','Arc')self.shapeComboBox.addItem('Points','Points')self.shapeComboBox.addItem('Text','Text')self.shapeComboBox.addItem('Pixmap','Pixmap')self.widthSpinBox = QSpinBox()self.widthSpinBox.setRange(0,20)self.penColorFrame = QFrame()self.penColorFrame.setAutoFillBackground(True)self.penColorFrame.setPalette(QPalette(Qt.blue))self.penColorPushButton = QPushButton("更改")self.penStyleComboBox = QComboBox()self.penStyleComboBox.addItem("Solid",Qt.SolidLine)self.penStyleComboBox.addItem('Dash', Qt.DashLine)self.penStyleComboBox.addItem('Dot', Qt.DotLine)self.penStyleComboBox.addItem('Dash Dot', Qt.DashDotLine)self.penStyleComboBox.addItem('Dash Dot Dot', Qt.DashDotDotLine)self.penStyleComboBox.addItem('None', Qt.NoPen)self.penCapComboBox = QComboBox()self.penCapComboBox.addItem("Flat",Qt.FlatCap)self.penCapComboBox.addItem('Square', Qt.SquareCap)self.penCapComboBox.addItem('Round', Qt.RoundCap)self.penJoinComboBox = QComboBox()self.penJoinComboBox.addItem("Miter",Qt.MiterJoin)self.penJoinComboBox.addItem('Bebel', Qt.BevelJoin)self.penJoinComboBox.addItem('Round', Qt.RoundJoin)self.brushStyleComboBox = QComboBox()self.brushStyleComboBox.addItem("Linear Gradient",Qt.LinearGradientPattern)self.brushStyleComboBox.addItem('Radial Gradient', Qt.RadialGradientPattern)self.brushStyleComboBox.addItem('Conical Gradient', Qt.ConicalGradientPattern)self.brushStyleComboBox.addItem('Texture', Qt.TexturePattern)self.brushStyleComboBox.addItem('Solid', Qt.SolidPattern)self.brushStyleComboBox.addItem('Horizontal', Qt.HorPattern)self.brushStyleComboBox.addItem('Vertical', Qt.VerPattern)self.brushStyleComboBox.addItem('Cross', Qt.CrossPattern)self.brushStyleComboBox.addItem('Backward Diagonal', Qt.BDiagPattern)self.brushStyleComboBox.addItem('Forward Diagonal', Qt.FDiagPattern)self.brushStyleComboBox.addItem('Diagonal Cross', Qt.DiagCrossPattern)self.brushStyleComboBox.addItem('Dense 1', Qt.Dense1Pattern)self.brushStyleComboBox.addItem('Dense 2', Qt.Dense2Pattern)self.brushStyleComboBox.addItem('Dense 3', Qt.Dense3Pattern)self.brushStyleComboBox.addItem('Dense 4', Qt.Dense4Pattern)self.brushStyleComboBox.addItem('Dense 5', Qt.Dense5Pattern)self.brushStyleComboBox.addItem('Dense 6', Qt.Dense6Pattern)self.brushStyleComboBox.addItem('Dense 7', Qt.Dense7Pattern)self.brushStyleComboBox.addItem('None', Qt.NoBrush)self.brushColorFrame = QFrame()self.brushColorFrame.setAutoFillBackground(True)self.brushColorFrame.setPalette(QPalette(Qt.green))self.brushColorPushButton = QPushButton("更改")labelCol=0contentCol=1#建立布局mainLayout.addWidget(label1,1,labelCol)mainLayout.addWidget(self.shapeComboBox,1,contentCol)mainLayout.addWidget(label2,2,labelCol)mainLayout.addWidget(self.widthSpinBox,2,contentCol)mainLayout.addWidget(label3,4,labelCol)mainLayout.addWidget(self.penColorFrame,4,contentCol)mainLayout.addWidget(self.penColorPushButton,4,3)mainLayout.addWidget(label4,6,labelCol)mainLayout.addWidget(self.penStyleComboBox,6,contentCol)mainLayout.addWidget(label5,8,labelCol)mainLayout.addWidget(self.penCapComboBox,8,contentCol)mainLayout.addWidget(label6,10,labelCol)mainLayout.addWidget(self.penJoinComboBox,10,contentCol)mainLayout.addWidget(label7,12,labelCol)mainLayout.addWidget(self.brushStyleComboBox,12,contentCol)mainLayout.addWidget(label8,14,labelCol)mainLayout.addWidget(self.brushColorFrame,14,contentCol)mainLayout.addWidget(self.brushColorPushButton,14,3)mainSplitter1 = QSplitter(Qt.Horizontal)mainSplitter1.setOpaqueResize(True)stack1 = QStackedWidget()stack1.setFrameStyle(QFrame.Panel|QFrame.Raised)self.area = PaintArea()stack1.addWidget(self.area) frame1 = QFrame(mainSplitter1)mainLayout1 = QVBoxLayout(frame1)#mainLayout1.setMargin(10)mainLayout1.setSpacing(6)mainLayout1.addWidget(stack1)layout = QGridLayout(self)layout.addWidget(mainSplitter1,0,0)layout.addWidget(mainSplitter,0,1)self.setLayout(layout)#信號和槽函數 self.shapeComboBox.activated.connect(self.slotShape)self.widthSpinBox.valueChanged.connect(self.slotPenWidth)self.penColorPushButton.clicked.connect(self.slotPenColor)self.penStyleComboBox.activated.connect(self.slotPenStyle)self.penCapComboBox.activated.connect(self.slotPenCap)self.penJoinComboBox.activated.connect(self.slotPenJoin)self.brushStyleComboBox.activated.connect(self.slotBrush)self.brushColorPushButton.clicked.connect(self.slotBrushColor)self.slotShape(self.shapeComboBox.currentIndex())self.slotPenWidth(self.widthSpinBox.value())self.slotBrush(self.brushStyleComboBox.currentIndex()) def slotShape(self,value):shape = self.area.Shape[value]self.area.setShape(shape)def slotPenWidth(self,value):color = self.penColorFrame.palette().color(QPalette.Window)style = Qt.PenStyle(self.penStyleComboBox.itemData(self.penStyleComboBox.currentIndex(),Qt.UserRole))cap = Qt.PenCapStyle(self.penCapComboBox.itemData(self.penCapComboBox.currentIndex(),Qt.UserRole))join = Qt.PenJoinStyle(self.penJoinComboBox.itemData(self.penJoinComboBox.currentIndex(),Qt.UserRole))self.area.setPen(QPen(color,value,style,cap,join))def slotPenStyle(self,value):self.slotPenWidth(value)def slotPenCap(self,value):self.slotPenWidth(value)def slotPenJoin(self,value):self.slotPenWidth(value)def slotPenColor(self):color = QColorDialog.getColor(Qt.blue)self.penColorFrame.setPalette(QPalette(color))self.area.setPen(QPen(color))def slotBrushColor(self):color = QColorDialog.getColor(Qt.blue)self.brushColorFrame.setPalette(QPalette(color))self.slotBrush(self.brushStyleComboBox.currentIndex())def slotBrush(self,value):color = self.brushColorFrame.palette().color(QPalette.Window)style = Qt.BrushStyle(self.brushStyleComboBox.itemData(value,Qt.UserRole))if(style == Qt.LinearGradientPattern):linearGradient = QLinearGradient(0,0,400,400)linearGradient.setColorAt(0.0,Qt.white)linearGradient.setColorAt(0.2,color)linearGradient.setColorAt(1.0,Qt.black)self.area.setBrush(linearGradient)elif style ==Qt.RadialGradientPattern:radialGradient = QRadialGradient(200, 200, 80, 70, 70);radialGradient.setColorAt(0.0, Qt.white)radialGradient.setColorAt(0.2, Qt.green)radialGradient.setColorAt(1.0, Qt.black)self.area.setBrush(radialGradient)elif(style == Qt.ConicalGradientPattern):conicalGradient = QConicalGradient(200,200,30)conicalGradient.setColorAt(0.0,Qt.white)conicalGradient.setColorAt(0.2,color)conicalGradient.setColorAt(1.0,Qt.black)self.area.setBrush(conicalGradient)elif(style == Qt.TexturePattern):self.area.setBrush(QBrush(QPixmap("images/brick.png")))else:self.area.setBrush(QBrush(color,style))class PaintArea(QWidget):def __init__(self):super(PaintArea,self).__init__()self.Shape = ["Line","Rectangle", 'Rounded Rectangle', "Ellipse", "Pie", 'Chord', "Path","Polygon", "Polyline", "Arc", "Points", "Text", "Pixmap"]self.setPalette(QPalette(Qt.white))self.setAutoFillBackground(True)self.setMinimumSize(400,400)self.pen = QPen()self.brush = QBrush() def setShape(self,s):self.shape = sself.update()def setPen(self,p):self.pen = pself.update()def setBrush(self,b):self.brush = bself.update()def paintEvent(self,QPaintEvent):p = QPainter(self)p.setPen(self.pen)p.setBrush(self.brush)rect = QRect(50,100,300,200) points = [QPoint(150,100),QPoint(300,150),QPoint(350,250),QPoint(100,300)]startAngle = 30 * 16spanAngle = 120 * 16path = QPainterPath();path.addRect(150,150,100,100)path.moveTo(100,100)path.cubicTo(300,100,200,200,300,300)path.cubicTo(100,300,200,200,100,100)if self.shape == "Line":p.drawLine(rect.topLeft(),rect.bottomRight())elif self.shape == "Rectangle":p.drawRect(rect)elif self.shape == 'Rounded Rectangle':p.drawRoundedRect(rect, 25, 25, Qt.RelativeSize)elif self.shape == "Ellipse":p.drawEllipse(rect)elif self.shape == "Polygon":p.drawPolygon(QPolygon(points),Qt.WindingFill)elif self.shape == "Polyline":p.drawPolyline(QPolygon(points))elif self.shape == "Points":p.drawPoints(QPolygon(points))elif self.shape == "Pie":p.drawPie(rect, startAngle, spanAngle)elif self.shape == "Arc":p.drawArc(rect,startAngle,spanAngle)elif self.shape == "Chord":p.drawChord(rect, startAngle, spanAngle)elif self.shape == "Path":p.drawPath(path)elif self.shape == "Text":p.drawText(rect,Qt.AlignCenter,"Hello Qt!")elif self.shape == "Pixmap":p.drawPixmap(150,150,QPixmap("images/qt-logo.png"))if __name__=='__main__':app = QApplication(sys.argv)form = StockDialog()form.show()app.exec_()

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（羅兵 作于2015.02.05 ? ? 01:58）

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本文轉自羅兵博客園博客，原文鏈接：http://www.cnblogs.com/hhh5460/p/4273799.html，如需轉載請自行聯系原作者

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