【说明】
此例扒自 Qt 官网，原例是 C++ 代码，我把它改写成了 Python + PyQt5 版本。
有了前一个例子的成功，这个例子改写的非常之快。记得第一个例子花了我几天的时间，而这个例子只花了半个小时。
当然，过程中也遇到了一些新问题，比如 renderAreas 被定义成 QList类，而QList类的迭代，调试了几次都报错。没有办法，干脆把renderAreas 修改定义为Python的 list 类型，然后就OK了！！
本例基于： Win7 + Python 3.4 + PyQt5
【效果图】
对比原C++界面：
【源代码】
1 # File: Painter Paths Example.py
2 # Author: Robin
3 # Date: 2015.2.9
4 # C++: http://doc.qt.io/qt-5/qtwidgets-painting-painterpaths-example.html
5
6 import math
7 from PyQt5.QtCore import *
8 from PyQt5.QtGui import *
9 from PyQt5.QtWidgets import *
10
11
12 class RenderArea(QWidget):
13 def __init__(self, path, parent=None):
14 super(RenderArea, self).__init__(parent)
15 self.penWidth = 1
16 self.rotationAngle = 0
17 self.path = path
18 self.setBackgroundRole(QPalette.Base)
19 self.setAutoFillBackground(True)
20
21 def minimumSizeHint(self):
22 return QSize(50, 50)
23
24 def sizeHint(self):
25 return QSize(100, 100)
26
27 def setFillRule(self, rule):
28 self.path.setFillRule(rule)
29 self.update()
30
31 def setFillGradient(self, color1, color2):
32 self.fillColor1 = color1
33 self.fillColor2 = color2
34 self.update()
35
36 def setPenWidth(self, width):
37 self.penWidth = width
38 self.update()
39
40 def setPenColor(self, color):
41 self.penColor = color
42 self.update()
43
44 def setRotationAngle(self, degrees):
45 self.rotationAngle = degrees
46 self.update()
47
48 def paintEvent(self, event):
49 painter = QPainter(self)
50 painter.setRenderHint(QPainter.Antialiasing)
51 painter.scale(self.width() / 100.0, self.height() / 100.0)
52 painter.translate(50.0, 50.0)
53 painter.rotate(-self.rotationAngle)
54 painter.translate(-50.0, -50.0)
55 painter.setPen(QPen(self.penColor, self.penWidth, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
56 gradient = QLinearGradient(0, 0, 0, 100)
57 gradient.setColorAt(0.0, self.fillColor1)
58 gradient.setColorAt(1.0, self.fillColor2)
59 painter.setBrush(gradient)
60 painter.drawPath(self.path)
61
62
63 class MyWindow(QWidget):
64
65 def __init__(self):
66 super(MyWindow, self).__init__()
67 #self.setUi()
68 #self.Pi = 3.1415926
69 # 矩形路径
70 self.rectPath = QPainterPath()
71 self.rectPath.moveTo(20.0, 30.0)
72 self.rectPath.lineTo(80.0, 30.0)
73 self.rectPath.lineTo(80.0, 70.0)
74 self.rectPath.lineTo(20.0, 70.0)
75 self.rectPath.closeSubpath()
76 # 圆角矩形路径
77 self.roundRectPath = QPainterPath()
78 self.roundRectPath.moveTo(80.0, 35.0)
79 self.roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0)
80 self.roundRectPath.lineTo(25.0, 30.0)
81 self.roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0)
82 self.roundRectPath.lineTo(20.0, 65.0)
83 self.roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0)
84 self.roundRectPath.lineTo(75.0, 70.0)
85 self.roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0)
86 self.roundRectPath.closeSubpath()
87 # 椭圆路径
88 self.ellipsePath = QPainterPath()
89 self.ellipsePath.moveTo(80.0, 50.0)
90 self.ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0)
91 # 饼图路径
92 self.piePath = QPainterPath()
93 self.piePath.moveTo(50.0, 50.0)
94 self.piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0)
95 self.piePath.closeSubpath()
96 # 多边形路径
97 self.polygonPath = QPainterPath()
98 self.polygonPath.moveTo(10.0, 80.0)
99 self.polygonPath.lineTo(20.0, 10.0)
100 self.polygonPath.lineTo(80.0, 30.0)
101 self.polygonPath.lineTo(90.0, 70.0)
102 self.polygonPath.closeSubpath()
103 # 组合路径
104 self.groupPath = QPainterPath()
105 self.groupPath.moveTo(60.0, 40.0)
106 self.groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0)
107 self.groupPath.moveTo(40.0, 40.0)
108 self.groupPath.lineTo(40.0, 80.0)
109 self.groupPath.lineTo(80.0, 80.0)
110 self.groupPath.lineTo(80.0, 40.0)
111 self.groupPath.closeSubpath()
112 # 文字路径
113 self.textPath = QPainterPath()
114 self.timesFont = QFont("Times", 50)
115 self.timesFont.setStyleStrategy(QFont.ForceOutline)
116 self.textPath.addText(10, 70, self.timesFont, "Qt")
117 # 贝兹尔路径
118 self.bezierPath = QPainterPath()
119 self.bezierPath.moveTo(20, 30)
120 self.bezierPath.cubicTo(80, 0, 50, 50, 80, 80)
121
122 self.starPath = QPainterPath()
123 self.starPath.moveTo(90, 50)
124 for i in range(5):
125 self.starPath.lineTo(50 + 40 * math.cos(0.8 * i * math.pi),
126 50 + 40 * math.sin(0.8 * i * math.pi))
127 self.starPath.closeSubpath()
128
129 self.renderAreas = []
130 self.renderAreas.append(RenderArea(self.rectPath))
131 self.renderAreas.append(RenderArea(self.roundRectPath))
132 self.renderAreas.append(RenderArea(self.ellipsePath))
133 self.renderAreas.append(RenderArea(self.piePath))
134 self.renderAreas.append(RenderArea(self.polygonPath))
135 self.renderAreas.append(RenderArea(self.groupPath))
136 self.renderAreas.append(RenderArea(self.textPath))
137 self.renderAreas.append(RenderArea(self.bezierPath))
138 self.renderAreas.append(RenderArea(self.starPath))
139
140 #def setUi(self):
141 self.fillRuleComboBox = QComboBox()
142 self.fillRuleComboBox.addItem("Odd Even", Qt.OddEvenFill)
143 self.fillRuleComboBox.addItem("Winding", Qt.WindingFill)
144
145 self.fillRuleLabel = QLabel("Fill &Rule:")
146 self.fillRuleLabel.setBuddy(self.fillRuleComboBox)
147
148 self.fillColor1ComboBox = QComboBox()
149 self.populateWithColors(self.fillColor1ComboBox)
150 self.fillColor1ComboBox.setCurrentIndex(self.fillColor1ComboBox.findText("mediumslateblue"))
151
152 self.fillColor2ComboBox = QComboBox()
153 self.populateWithColors(self.fillColor2ComboBox)
154 self.fillColor2ComboBox.setCurrentIndex(self.fillColor2ComboBox.findText("cornsilk"))
155
156 self.fillGradientLabel = QLabel("&Fill Gradient:")
157 self.fillGradientLabel.setBuddy(self.fillColor1ComboBox)
158
159 self.fillToLabel = QLabel("to")
160 self.fillToLabel.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
161
162 self.penWidthSpinBox = QSpinBox()
163 self.penWidthSpinBox.setRange(0, 20)
164
165 self.penWidthLabel = QLabel("&Pen Width:")
166 self.penWidthLabel.setBuddy(self.penWidthSpinBox)
167
168 self.penColorComboBox = QComboBox()
169 self.populateWithColors(self.penColorComboBox)
170 self.penColorComboBox.setCurrentIndex(self.penColorComboBox.findText("darkslateblue"))
171
172 self.penColorLabel = QLabel("Pen &Color:")
173 self.penColorLabel.setBuddy(self.penColorComboBox)
174
175 self.rotationAngleSpinBox = QSpinBox()
176 self.rotationAngleSpinBox.setRange(0, 359)
177 self.rotationAngleSpinBox.setWrapping(True)
178 self.rotationAngleSpinBox.setSuffix("°")
179
180 self.rotationAngleLabel = QLabel("&Rotation Angle:")
181 self.rotationAngleLabel.setBuddy(self.rotationAngleSpinBox)
182
183 self.fillRuleComboBox.activated.connect(self.fillRuleChanged)
184 self.fillColor1ComboBox.activated.connect(self.fillGradientChanged)
185 self.fillColor2ComboBox.activated.connect(self.fillGradientChanged)
186 self.penColorComboBox.activated.connect(self.penColorChanged)
187
188 for it in self.renderAreas:
189 self.penWidthSpinBox.valueChanged.connect(it.setPenWidth)
190 self.rotationAngleSpinBox.valueChanged.connect(it.setRotationAngle)
191
192
193 topLayout = QGridLayout()
194
195 i = 0
196 for i, it in enumerate(self.renderAreas):
197 topLayout.addWidget(it, i // 3, i % 3)
198
199
200 mainLayout = QGridLayout()
201 mainLayout.addLayout(topLayout, 0, 0, 1, 4)
202 mainLayout.addWidget(self.fillRuleLabel, 1, 0)
203 mainLayout.addWidget(self.fillRuleComboBox, 1, 1, 1, 3)
204 mainLayout.addWidget(self.fillGradientLabel, 2, 0)
205 mainLayout.addWidget(self.fillColor1ComboBox, 2, 1)
206 mainLayout.addWidget(self.fillToLabel, 2, 2)
207 mainLayout.addWidget(self.fillColor2ComboBox, 2, 3)
208 mainLayout.addWidget(self.penWidthLabel, 3, 0)
209 mainLayout.addWidget(self.penWidthSpinBox, 3, 1, 1, 3)
210 mainLayout.addWidget(self.penColorLabel, 4, 0)
211 mainLayout.addWidget(self.penColorComboBox, 4, 1, 1, 3)
212 mainLayout.addWidget(self.rotationAngleLabel, 5, 0)
213 mainLayout.addWidget(self.rotationAngleSpinBox, 5, 1, 1, 3)
214 self.setLayout(mainLayout)
215
216 self.fillRuleChanged()
217 self.fillGradientChanged()
218 self.penColorChanged()
219 self.penWidthSpinBox.setValue(2)
220
221 self.setWindowTitle("Painter Paths")
222
223 def fillRuleChanged(self):
224 rule = self.currentItemData(self.fillRuleComboBox)
225 for it in self.renderAreas:
226 it.setFillRule(rule)
227
228 def fillGradientChanged(self):
229 color1 = self.currentItemData(self.fillColor1ComboBox)
230 color2 = self.currentItemData(self.fillColor2ComboBox)
231 for it in self.renderAreas:
232 it.setFillGradient(color1, color2)
233
234 def penColorChanged(self):
235 color = self.currentItemData(self.penColorComboBox)
236 for it in self.renderAreas:
237 it.setPenColor(color)
238
239 @staticmethod
240 def populateWithColors(comboBox):
241 colorNames = QColor.colorNames()
242 for name in colorNames:
243 comboBox.addItem(name, QColor(name))
244
245 @staticmethod
246 def currentItemData(comboBox):
247 return comboBox.itemData(comboBox.currentIndex(),Qt.UserRole)
248
249
250 if __name__ == "__main__":
251 import sys
252 app = QApplication(sys.argv)
253 win = MyWindow()
254 win.show()
255 sys.exit(app.exec_())
时间： 2024-08-29 08:22:21