python pyqt怎么画圆
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发布时间：2022-04-21 23:52
共1个回答
热心网友
时间：2022-04-06 15:55
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=0
contentCol=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
