转：
https://www.cnblogs.com/hhh5460/p/4273799.html#top
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")
#预定义控件
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()#下拉列表框
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()#计算器
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()#下拉列表框
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()#下拉列表框
self.penCapComboBox.addItem("Flat", Qt.FlatCap)
self.penCapComboBox.addItem('Square', Qt.SquareCap)
self.penCapComboBox.addItem('Round', Qt.RoundCap)
self.penJoinComboBox = QComboBox()#下拉列表框
self.penJoinComboBox.addItem("Miter", Qt.MiterJoin)
self.penJoinComboBox.addItem('Bebel', Qt.BevelJoin)
self.penJoinComboBox.addItem('Round', Qt.RoundJoin)
self.brushStyleComboBox = QComboBox()#下拉列表框
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
mainSplitter = QSplitter(Qt.Horizontal)
mainSplitter.setOpaqueResize(True)
frame = QFrame(mainSplitter)
mainLayout = QGridLayout(frame)
# mainLayout.setMargin(10)
mainLayout.setSpacing(6)
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) #设置形状
self.widthSpinBox.valueChanged.connect(self.slotPenWidth) #设置笔的线宽
self.penColorPushButton.clicked.connect(self.slotPenColor) #设置笔的颜色
self.penStyleComboBox.activated.connect(self.slotPenStyle) #设置笔的风格
self.penCapComboBox.activated.connect(self.slotPenCap) #设置笔的顶端
self.penJoinComboBox.activated.connect(self.slotPenJoin) #设置笔的连接点
self.brushStyleComboBox.activated.connect(self.slotBrush) #设置画刷的风格
self.brushColorPushButton.clicked.connect(self.slotBrushColor) #设置画刷的颜色
self.slotShape(self.shapeComboBox.currentIndex()) #设置形状（初始化）
self.slotPenWidth(self.widthSpinBox.value()) #设置笔的线宽（初始化）
self.slotBrush(self.brushStyleComboBox.currentIndex()) #设置画刷的风格（初始化）
# 设置形状
def slotShape(self, value):
shape = self.area.Shape[value]
self.area.setShape(shape)
#设置笔的线宽
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))
#设置笔的风格
def slotPenStyle(self, value):
self.slotPenWidth(value)
#设置笔的顶端
def slotPenCap(self, value):
self.slotPenWidth(value)
#设置笔的连接点
def slotPenJoin(self, value):
self.slotPenWidth(value)
#设置笔的颜色
def slotPenColor(self):
color = QColorDialog.getColor(Qt.blue)
self.penColorFrame.setPalette(QPalette(color))
self.area.setPen(QPen(color))
#设置画刷的颜色
def slotBrushColor(self):
color = QColorDialog.getColor(Qt.blue)
self.brushColorFrame.setPalette(QPalette(color))
self.slotBrush(self.brushStyleComboBox.currentIndex())
#设置画刷的风格
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))#背景颜色
self.setAutoFillBackground(True)#设置窗体自动填充背景
self.setMinimumSize(400, 400)#背景大小
self.pen = QPen()#定义笔
self.brush = QBrush()#定义画刷
#设置形状
def setShape(self, s):
self.shape = s
self.update()
#设置笔
def setPen(self, p):
self.pen = p
self.update()
#设置画刷
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)#代表一个矩形区域,实现在QtCore库,是一个QPoint对象和一个QSize对象的组合,QPoint对象是它的左上角的坐标,QSize对象则是它的大小
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(0, 50, QPixmap("images/qt-logo.jpg"))
if __name__ == '__main__':
app = QApplication(sys.argv)
demo = StockDialog()
demo.show()
app.exec_()