• [Qt扒手] PyQt5 基础绘画例子

    【说明】

        好吧，坦白从宽，我是Qt扒手（不要鄙视我）。这是我根据qt官网提供的C++版本的例子(http://doc.qt.io/qt-5/qtwidgets-painting-basicdrawing-example.html)，改编而成的Python版本。

        由于本人没有C++基础，其难度之大，自不待言。

        不过，还是毛主席说的好：道路是艰难的，结果是光明的:)

        本文基于 win7 + Python3.4 + PyQt5  环境

    【效果图】

        对比原C++的界面：

    【源代码】

      1 # File: Basic Draw Example.py
  2 # Author: Robin
  3 # Date: 2015.2.9
  4 # C++: http://doc.qt.io/qt-5/qtwidgets-painting-basicdrawing-example.html
  5 
  6 from PyQt5.QtCore import *
  7 from PyQt5.QtGui import *
  8 from PyQt5.QtWidgets import *
  9 
 10 class RenderArea(QWidget):
 11     Shape = range(13)
 12     (Line, Points, Polyline, Polygon, Rect, RoundedRect, 
 13     Ellipse, Arc, Chord, Pie, Path, Text, Pixmap) = Shape
 14     
 15     def __init__(self, parent=None):
 16         super(RenderArea, self).__init__(parent)
 17         
 18         self.shape = self.Polygon
 19         self.pen = Qt.NoPen
 20         self.brush = Qt.NoBrush
 21         self.antialiased = False
 22         self.transformed = False
 23         self.pixmap = QPixmap()
 24         self.pixmap.load("images/qt-logo.png")
 25         
 26         self.setBackgroundRole(QPalette.Base)
 27         self.setAutoFillBackground(True)
 28         
 29     def setShape(self, shape):
 30         self.shape = shape
 31         self.update()
 32         
 33     def setPen(self,  pen):
 34         self.pen = pen
 35         self.update()
 36         
 37     def setBrush(self,  brush):
 38         self.brush = brush
 39         self.update()
 40         
 41     def setAntialiased(self, antialiased):
 42         self.antialiased = antialiased
 43         self.update()
 44         
 45     def setTransformed(self, transformed):
 46         self.transformed = transformed
 47         self.update()
 48         
 49     def paintEvent(self, event):
 50         points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]
 51         rect = QRect(10, 20, 80, 60)
 52         path = QPainterPath()
 53         path.moveTo(20, 80)
 54         path.lineTo(20, 30)
 55         path.cubicTo(80, 0, 50, 50, 80, 80)
 56         startAngle = 20 * 16
 57         arcLength = 120 * 16
 58         
 59         painter = QPainter()
 60         painter.begin(self)
 61         painter.setPen(self.pen)
 62         painter.setBrush(self.brush)
 63         
 64         if self.antialiased:
 65             painter.setRenderHint(QPainter.Antialiasing, True)
 66         for x in range(0, self.width(), 100):
 67             for y in range(0, self.height(), 100):
 68                 painter.save() # 在画笔改变之前保存初始设置，即原点（0,0）处的设置
 69                 painter.translate(x, y)
 70                 if self.transformed:
 71                     painter.translate(50, 50)
 72                     painter.rotate(60.0)
 73                     painter.scale(0.6, 0.9)
 74                     painter.translate(-50, -50)
 75                 if self.shape == self.Line:
 76                     painter.drawLine(rect.bottomLeft(), rect.topRight())
 77                 elif self.shape == self.Points:
 78                     painter.drawPoints(QPolygon(points))
 79                 elif self.shape == self.Polyline:
 80                     painter.drawPolyline(QPolygon(points))
 81                 elif self.shape == self.Polygon:
 82                     painter.drawPolygon(QPolygon(points), Qt.WindingFill)
 83                 elif self.shape == self.Rect:
 84                     painter.drawRect(rect)
 85                 elif self.shape == self.RoundedRect:
 86                     painter.drawRoundedRect(rect, 25, 25, Qt.RelativeSize)
 87                 elif self.shape == self.Ellipse:
 88                     painter.drawEllipse(rect)
 89                 elif self.shape == self.Arc:
 90                     painter.drawArc(rect, startAngle, arcLength)
 91                 elif self.shape == self.Chord:
 92                     painter.drawChord(rect, startAngle, arcLength)
 93                 elif self.shape == self.Pie:
 94                     painter.drawPie(rect, startAngle, arcLength)
 95                 elif self.shape == self.Path:
 96                     painter.drawPath(path)
 97                 elif self.shape == self.Text:
 98                     painter.drawText(rect, Qt.AlignCenter, "Qt by
Digia")
 99                 elif self.shape == self.Pixmap:
100                     painter.drawPixmap(10, 10, self.pixmap)
101                 painter.restore()  # 画完一个之后，将画笔还原到初始设置，即原点（0,0）处的设置。好处是便于计算下一次的坐标变换
102 
103         painter.setPen(self.palette().dark().color())
104         painter.setBrush(Qt.NoBrush)
105         painter.setRenderHint(QPainter.Antialiasing, False)
106         painter.drawRect(QRect(0, 0, self.width() - 1, self.height() - 1))
107         painter.end()
108 
109     def sizeHint(self):
110         return QSize(400, 200)
111     
112     def minimumSizeHint(self):
113         return QSize(100, 100)
114 
115 
116 class MyWindow(QWidget):
117     
118     def __init__(self):
119         super(MyWindow, self).__init__() 
120         self.setUi()
121         
122         self.shapeChanged()
123         self.penChanged()
124         self.brushChanged()
125         self.checkBox_antialiasing.setChecked(True)        
126         
127     def setUi(self): 
128         self.setWindowTitle("基础绘画例子")
129         self.resize(400,300)
130         self.renderArea = RenderArea()
131 
132         self.label_shape = QLabel("Shape:")
133         self.label_penStyle = QLabel("Pen Style:")
134         self.label_brushStyle = QLabel("Brush Style:")
135         self.label_penWidth = QLabel("Pen Width:")
136         self.label_penCap = QLabel("Pen Cap:")
137         self.label_penJoin = QLabel("Pen Join:")
138         
139         self.comboBox_shape = QComboBox()
140         self.comboBox_penStyle = QComboBox()
141         self.comboBox_brushStyle = QComboBox()
142         self.spinBox_penWidth = QSpinBox()
143         self.comboBox_penCap = QComboBox()
144         self.comboBox_penJoin = QComboBox()
145         
146         self.checkBox_antialiasing = QCheckBox("Antialiasing")
147         self.checkBox_transformations = QCheckBox("Transformations")
148         
149         
150         gridLayout = QGridLayout()
151 
152         gridLayout.setColumnStretch(0, 1)
153         gridLayout.setColumnStretch(1, 4)
154         gridLayout.setColumnStretch(2, 1)
155         gridLayout.setColumnStretch(3, 1)
156         gridLayout.setColumnStretch(4, 4)
157         
158         gridLayout.setColumnMinimumWidth(2, 15)
159         gridLayout.setSpacing(15)
160         #gridLayout.setMargin(10)
161         
162         gridLayout.addWidget(self.renderArea, 0, 0, 1, 5)
163         gridLayout.addWidget(self.label_shape, 1, 0)
164         gridLayout.addWidget(self.label_penStyle, 2, 0)
165         gridLayout.addWidget(self.label_brushStyle, 3, 0)
166         gridLayout.addWidget(self.checkBox_antialiasing, 4, 0, 1, 2)
167         gridLayout.addWidget(self.comboBox_shape, 1, 1)
168         gridLayout.addWidget(self.comboBox_penStyle, 2, 1)
169         gridLayout.addWidget(self.comboBox_brushStyle, 3, 1)
170         gridLayout.addWidget(self.label_penWidth, 1, 3)
171         gridLayout.addWidget(self.label_penCap, 2, 3)
172         gridLayout.addWidget(self.label_penJoin, 3, 3)
173         gridLayout.addWidget(self.checkBox_transformations, 4, 3, 1, 2)
174         gridLayout.addWidget(self.spinBox_penWidth, 1, 4)
175         gridLayout.addWidget(self.comboBox_penCap, 2, 4)
176         gridLayout.addWidget(self.comboBox_penJoin, 3, 4)
177 
178         
179         self.setLayout(gridLayout)
180 
181         #self.checkBox_antialiasing.setChecked(True)
182         #Line, Points, Polyline, Polygon, Rect, RoundedRect, 
183         #Ellipse, Arc, Chord, Pie, Path, Text, Pixmap
184         self.comboBox_shape.addItem('Line')
185         self.comboBox_shape.addItem('Points')
186         self.comboBox_shape.addItem('Polyline')
187         self.comboBox_shape.addItem('Polygon')
188         self.comboBox_shape.addItem('Rect')
189         self.comboBox_shape.addItem('RoundedRect')
190         self.comboBox_shape.addItem('Ellipse')
191         self.comboBox_shape.addItem('Arc')
192         self.comboBox_shape.addItem('Chord')
193         self.comboBox_shape.addItem('Pie')
194         self.comboBox_shape.addItem('Path')
195         self.comboBox_shape.addItem('Text')
196         self.comboBox_shape.addItem('Pixmap')
197         
198         self.spinBox_penWidth.setRange(0, 20)
199         #self.spinBox_penWidth.setSpecialValue('0 (cosmetic pen)')
200         
201         self.comboBox_penStyle.addItem('Solid',Qt.SolidLine)
202         self.comboBox_penStyle.addItem('Dash',Qt.DashLine)
203         self.comboBox_penStyle.addItem('Dot',Qt.DotLine)
204         self.comboBox_penStyle.addItem('Dash Dot',Qt.DashDotLine)
205         self.comboBox_penStyle.addItem('Dash Dot Dot',Qt.DashDotDotLine)
206         self.comboBox_penStyle.addItem('None',Qt.NoPen)
207         
208         self.comboBox_penCap.addItem('Flat',Qt.FlatCap)
209         self.comboBox_penCap.addItem('Square',Qt.SquareCap)
210         self.comboBox_penCap.addItem('Round',Qt.RoundCap)
211         
212         self.comboBox_penJoin.addItem('Miter',Qt.MiterJoin)
213         self.comboBox_penJoin.addItem('Bebel',Qt.BevelJoin)
214         self.comboBox_penJoin.addItem('Round',Qt.RoundJoin)
215         
216         self.comboBox_brushStyle.addItem('Linear Gradient',Qt.LinearGradientPattern)
217         self.comboBox_brushStyle.addItem('Radial Gradient',Qt.RadialGradientPattern)
218         self.comboBox_brushStyle.addItem('Conical Gradient',Qt.ConicalGradientPattern)
219         self.comboBox_brushStyle.addItem('Texture',Qt.TexturePattern)
220         self.comboBox_brushStyle.addItem('Solid',Qt.SolidPattern)
221         self.comboBox_brushStyle.addItem('Horizontal',Qt.HorPattern)
222         self.comboBox_brushStyle.addItem('Vertical',Qt.VerPattern)
223         self.comboBox_brushStyle.addItem('Cross',Qt.CrossPattern)
224         self.comboBox_brushStyle.addItem('Backward Diagonal',Qt.BDiagPattern)
225         self.comboBox_brushStyle.addItem('Forward Diagonal',Qt.FDiagPattern)
226         self.comboBox_brushStyle.addItem('Diagonal Cross',Qt.DiagCrossPattern)
227         self.comboBox_brushStyle.addItem('Dense 1',Qt.Dense1Pattern)
228         self.comboBox_brushStyle.addItem('Dense 2',Qt.Dense2Pattern)
229         self.comboBox_brushStyle.addItem('Dense 3',Qt.Dense3Pattern)
230         self.comboBox_brushStyle.addItem('Dense 4',Qt.Dense4Pattern)
231         self.comboBox_brushStyle.addItem('Dense 5',Qt.Dense5Pattern)
232         self.comboBox_brushStyle.addItem('Dense 6',Qt.Dense6Pattern)
233         self.comboBox_brushStyle.addItem('Dense 7',Qt.Dense7Pattern)
234         self.comboBox_brushStyle.addItem('None',Qt.NoBrush)
235 
236 
237         self.comboBox_shape.currentIndexChanged.connect(self.shapeChanged)
238         self.comboBox_brushStyle.currentIndexChanged.connect(self.brushChanged)
239         self.spinBox_penWidth.valueChanged.connect(self.penChanged)
240         self.comboBox_penStyle.currentIndexChanged.connect(self.penChanged)
241         self.comboBox_penCap.currentIndexChanged.connect(self.penChanged)
242         self.comboBox_penJoin.currentIndexChanged.connect(self.penChanged)
243         self.checkBox_antialiasing.clicked.connect(self.renderArea.setAntialiased)
244         self.checkBox_transformations.clicked.connect(self.renderArea.setTransformed)
245 
246     def shapeChanged(self):
247         index = self.comboBox_shape.currentIndex()
248         shape = self.renderArea.Shape[index]
249         self.renderArea.setShape(shape)
250     
251     def penChanged(self):
252         width = self.spinBox_penWidth.value()
253         style = Qt.PenStyle(self.comboBox_penStyle.itemData(self.comboBox_penStyle.currentIndex(),Qt.UserRole))
254         cap = Qt.PenCapStyle(self.comboBox_penCap.itemData(self.comboBox_penCap.currentIndex(),Qt.UserRole))
255         join = Qt.PenJoinStyle(self.comboBox_penJoin.itemData(self.comboBox_penJoin.currentIndex(),Qt.UserRole))
256         self.renderArea.setPen(QPen(Qt.blue, width, style, cap, join))
257         
258     def brushChanged(self):
259         style = Qt.BrushStyle(self.comboBox_brushStyle.itemData(self.comboBox_brushStyle.currentIndex(),Qt.UserRole))
260         if style == Qt.LinearGradientPattern:
261             linearGradient = QLinearGradient(0, 0, 100, 100)
262             linearGradient.setColorAt(0.0, Qt.white)
263             linearGradient.setColorAt(0.2, Qt.green)
264             linearGradient.setColorAt(1.0, Qt.black)
265             self.renderArea.setBrush(linearGradient)
266         elif style == Qt.RadialGradientPattern:
267             radialGradient = QRadialGradient(50, 50, 50, 70, 70);
268             radialGradient.setColorAt(0.0, Qt.white)
269             radialGradient.setColorAt(0.2, Qt.green)
270             radialGradient.setColorAt(1.0, Qt.black)
271             self.renderArea.setBrush(radialGradient)
272         elif style == Qt.ConicalGradientPattern:
273             conicalGradient = QConicalGradient(50, 50, 150)
274             conicalGradient.setColorAt(0.0, Qt.white)
275             conicalGradient.setColorAt(0.2, Qt.green)
276             conicalGradient.setColorAt(1.0, Qt.black)
277             self.renderArea.setBrush(conicalGradient)
278         elif style == Qt.TexturePattern:
279             self.renderArea.setBrush(QBrush(QPixmap("images/brick.png")))
280         else:
281             self.renderArea.setBrush(QBrush(Qt.green, style))
282     
283 
284 
285 if __name__ == "__main__":
286     import sys
287     app = QApplication(sys.argv)
288     win = MyWindow()
289     win.show()
290     sys.exit(app.exec_())
    View Code
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  • 原文地址：https://www.cnblogs.com/hhh5460/p/4280784.html
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