python pyqt怎么画圆

python pyqt怎么画圆

这个例子我做了好几天：
1）官网C++的源码，改写成PyQt5版本的代码，好多细节不会转化
2）网上的PyQt的例子根本运行不了
填了无数个坑，结合二者，终于能完成了一个关于绘图的东西。这个过程也掌握了很多新的知识点
【知识点】
1、关于多个点的使用
poitns = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]
请看：

1 # 定义多个点 2 points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)] 3 4 # ===直接使用 points 会报错！========= 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()包裹起来才正确！=========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窗体中显示QWidget部件

【效果图】

【资源】
【代码】

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绘制各种图形")mainSplitter = QSplitter(Qt.Horizontal)mainSplitter.setOpaqueResize(True)frame = QFrame(mainSplitter)mainLayout = QGridLayout(frame) #mainLayout.setMargin(10)mainLayout.setSpacing(6)label1=QLabel("形状：")label2=QLabel("画笔线宽：")label3=QLabel("画笔颜色：")label4=QLabel("画笔风格：")label5=QLabel("画笔顶端：")label6=QLabel("画笔连接点：")label7=QLabel("画刷风格：")label8=QLabel("画刷颜色：")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)#信号和槽函数 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.Lin
2017-11-16