神剑山庄资源网

PyQt5利用QPainter绘制各种图形的实例
脚本专栏 2024/10/3 佚名
2 0
神剑山庄资源网 Design By www.hcban.com

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：

# 定义多个点
   points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]

   # ===直接使用 points 会报错！=========
   # ...
   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()包裹起来才正确！=========
   # ...
   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窗体中显示QWidget部件

【效果图】

PyQt5利用QPainter绘制各种图形的实例PyQt5利用QPainter绘制各种图形的实例

【资源】

//img.jbzj.com/file_images/article/201710/brick.png
//img.jbzj.com/file_images/article/201710/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_()

以上这篇PyQt5利用QPainter绘制各种图形的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。

标签：
QPainter绘制图形
神剑山庄资源网 Design By www.hcban.com
神剑山庄资源网 免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！ 如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
神剑山庄资源网 Design By www.hcban.com

评论“PyQt5利用QPainter绘制各种图形的实例”

暂无PyQt5利用QPainter绘制各种图形的实例的评论...
www.hcban.com 神剑山庄资源网
139,976影音资源
144,792福利资源
21,817软件资源
631,128技术资源

P70系列延期，华为新旗舰将在下月发布

3月20日消息，近期博主@数码闲聊站 透露，原定三月份发布的华为新旗舰P70系列延期发布，预计4月份上市。

而博主@定焦数码 爆料，华为的P70系列在定位上已经超过了Mate60，成为了重要的旗舰系列之一。它肩负着重返影像领域顶尖的使命。那么这次P70会带来哪些令人惊艳的创新呢？

根据目前爆料的消息来看，华为P70系列将推出三个版本，其中P70和P70 Pro采用了三角形的摄像头模组设计，而P70 Art则采用了与上一代P60 Art相似的不规则形状设计。这样的外观是否好看见仁见智，但辨识度绝对拉满。

更新日志

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
神剑山庄资源网 Design By www.hcban.com