PyQt5利用QPainter绘制各种图形
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】
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
【代码】
import sys from 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.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 = s self.update() def setPen(self,p): self.pen = p self.update() def setBrush(self,b): self.brush = b self.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 * 16 spanAngle = 120 * 16 path = 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_()
(罗兵 作于2015.02.05 01:58)
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· Brainfly: 用 C# 类型系统构建 Brainfuck 编译器
· 智能桌面机器人:用.NET IoT库控制舵机并多方法播放表情
· Linux glibc自带哈希表的用例及性能测试
· 深入理解 Mybatis 分库分表执行原理
· 如何打造一个高并发系统?
· DeepSeek 全面指南,95% 的人都不知道的9个技巧(建议收藏)
· 对比使用DeepSeek与文新一言,了解DeepSeek的关键技术论文
· Brainfly: 用 C# 类型系统构建 Brainfuck 编译器
· DeepSeekV3+Roo Code,智能编码好助手
· AI编程:如何编写提示词