PyQt5利用QPainter繪制各種圖形的實(shí)例
更新時間：2017年10月19日 09:50:36 作者：羅兵
下面小編就為大家?guī)硪黄狿yQt5利用QPainter繪制各種圖形的實(shí)例。小編覺得挺不錯的，現(xiàn)在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧
這個例子我做了好幾天：
1）官網(wǎng)C++的源碼，改寫成PyQt5版本的代碼，好多細(xì)節(jié)不會轉(zhuǎn)化
2）網(wǎng)上的PyQt的例子根本運(yùn)行不了
填了無數(shù)個坑，結(jié)合二者，終于能完成了一個關(guān)于繪圖的東西。這個過程也掌握了很多新的知識點(diǎn)
【知識點(diǎn)】
1、關(guān)于多個點(diǎn)的使用
poitns = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]
請看：
# 定義多個點(diǎn)
points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]
# ===直接使用 points 會報(bào)錯！=========
# ...
elif self.shape == self.Points:
painter.drawPoints(points)
elif self.shape == self.Polyline:
painter.drawPolyline(points)
elif self.shape == self.Polygon:
painter.drawPolygon(points, 4)
# ...
# ===把 points 用 QPolygon()包裹起來才正確！=========
# ...
elif self.shape == self.Points:
painter.drawPoints(QPolygon(points))
elif self.shape == self.Polyline:
painter.drawPolyline(QPolygon(points))
elif self.shape == self.Polygon:
painter.drawPolygon(QPolygon(points), 4)
# ...
2、在QDialog窗體中顯示QWidget部件
【效果圖】
【資源】
//img.jbzj.com/file_images/article/201710/brick.png
//img.jbzj.com/file_images/article/201710/qt-logo.png
【代碼】
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(fēng)格：")
label5=QLabel("畫筆頂端：")
label6=QLabel("畫筆連接點(diǎn)：")
label7=QLabel("畫刷風(fēng)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=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)
#信號和槽函數(shù)
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_()
以上這篇PyQt5利用QPainter繪制各種圖形的實(shí)例就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。
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