如何实时取得QSpinBox的值

自己emit一个信号，步骤如下(保证你这个两个cpp都对应的类是继承自QObject类)：

准备两个cpp,一个是包含QSpinBox的cpp，一个是需要获得SpinBox改变的值

1、在QSpinBox的类中（可能是QWidget）中增加一个信号void spinBoxChanged(QString)

2、对于一个QSpinBox会有一个valueChanged的信号槽，假设你已经实现了这个槽函数中，并且在这个槽函数中得到了改变后的值，然后emit spinBoxChanged(changeValue)

3、再在另一个需要获得SpinBox的cpp对应的类（假设是QClass）中增加一个与信号函数的参数相同的槽函数

void slotSpinBoxChanged(QString).并实现之

4、连接两个对象的信号和槽，一般在初始化中连接

可能写的不太好懂，为了简单，你可以利用QT的一个信号对应多个槽的机制，不需要自己发信号，直接把槽函数和QSpinBox的valueChanged信号相连，这样就更简单了。

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

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