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Qt5利用自绘QPainter实现旋转按钮MySpinButton
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.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 MySpinButton.cpp \
20 main.cpp \
21 mainwindow.cpp
22
23 HEADERS += \
24 MySpinButton.h \
25 mainwindow.h
26
27 FORMS += \
28 mainwindow.ui
29
30 # Default rules for deployment.
31 qnx: target.path = /tmp/$${TARGET}/bin
32 else: unix:!android: target.path = /opt/$${TARGET}/bin
33 !isEmpty(target.path): INSTALLS += target
View Code
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
View Code
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5 #include "MySpinButton.h"
6
7 QT_BEGIN_NAMESPACE
8 namespace Ui { class MainWindow; }
9 QT_END_NAMESPACE
10
11 class MainWindow : public QMainWindow
12 {
13 Q_OBJECT
14
15 public:
16 MainWindow(QWidget *parent = nullptr);
17 ~MainWindow();
18
19 private:
20 Ui::MainWindow *ui;
21 };
22 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 MainWindow::MainWindow(QWidget *parent)
5 : QMainWindow(parent)
6 , ui(new Ui::MainWindow)
7 {
8 ui->setupUi(this);
9
10 MySpinButton *Spin_button = new MySpinButton(this);
11 Spin_button->resize (200, 200);
12 Spin_button->move (10, 10);
13 Spin_button->show();
14 }
15
16 MainWindow::~MainWindow()
17 {
18 delete ui;
19 }
View Code
mainwindow.ui
1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>MainWindow</class> 4 <widget class="QMainWindow" name="MainWindow"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>184</width> 10 <height>188</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>MainWindow</string> 15 </property> 16 <widget class="QWidget" name="centralwidget"/> 17 <widget class="QMenuBar" name="menubar"> 18 <property name="geometry"> 19 <rect> 20 <x>0</x> 21 <y>0</y> 22 <width>184</width> 23 <height>23</height> 24 </rect> 25 </property> 26 </widget> 27 <widget class="QStatusBar" name="statusbar"/> 28 </widget> 29 <resources/> 30 <connections/> 31 </ui>View Code
MySpinButton.h
1 #ifndef MYSPINBUTTON_H
2 #define MYSPINBUTTON_H
3
4 #include <QWidget>
5
6 #define whirlbuttonHeigth 130
7 #define whirlbuttonWidth 120
8
9 class MySpinButton : public QWidget
10 {
11 Q_OBJECT
12 public:
13 void paintEvent(QPaintEvent *event);
14 explicit MySpinButton(QWidget *parent = nullptr);
15 ~MySpinButton();
16 void setDegree(int deg);
17 int getDegree();
18
19 signals:
20 void updateDegree();
21 protected:
22 void mousePressEvent(QMouseEvent *event);
23 void mouseMoveEvent(QMouseEvent *event);
24 void mouseReleaseEvent(QMouseEvent *event);
25 void mouseToPosion(QMouseEvent *event);
26 QSize sizeHint() const;
27 QSize minimumSizeHint() const;
28 private:
29 int degree;
30 };
31
32
33 #endif // MYSPINBUTTON_H
View Code
MySpinButton.cpp
1 #include "MySpinButton.h"
2
3
4 #include <QPainter>
5 #include <QMouseEvent>
6 #include <math.h>
7
8 MySpinButton::MySpinButton(QWidget *parent) : QWidget(parent)
9 {
10 setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum);
11 degree = 90;
12 }
13
14 MySpinButton::~MySpinButton()
15 {
16 }
17
18 void MySpinButton::setDegree(int deg)
19 {
20 this->degree = deg;
21 this->update();
22 }
23 void MySpinButton::paintEvent(QPaintEvent *event)
24 {
25 QPainter painter(this);
26 //反走样
27 painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
28 QTransform tranform1;
29 int originY = whirlbuttonHeigth/2;
30 int originX = whirlbuttonWidth/2;
31
32
33 const int triangle[3][2] =
34 {
35 { originX-2, 0 },
36 { originX+2, 0 },
37 { originX, 7 }
38 };
39
40 painter.setPen(QPen(Qt::red));
41 painter.setBrush(QBrush(Qt::red));
42 //绘制多边形，三角形。
43 painter.drawPolygon(QPolygon(3, &triangle[0][0]));
44
45
46 tranform1.translate(originX,originY);
47 tranform1.rotate(degree);
48 tranform1.translate(-(originX),-(originY));
49 painter.setWorldTransform(tranform1);
50
51 QPen thickPen(palette().foreground(), 1.5);
52 QPen midPen(palette().foreground(), 1.0);
53 QPen thinPen(palette().foreground(), 0.5);
54 QColor niceBlue(150, 150, 200);
55 painter.setPen(thinPen);
56
57
58 //随着程度逐渐改变
59 QConicalGradient coneGradient(originX, originY, -90.0);
60 coneGradient.setColorAt(0.0, Qt::darkGray);
61 coneGradient.setColorAt(0.2, niceBlue);
62 coneGradient.setColorAt(1.0, Qt::white);
63 coneGradient.setColorAt(1.0, Qt::darkGray);
64
65 unsigned r = 56;
66 painter.setBrush(coneGradient);
67 painter.drawEllipse((originX-r), (originY-r), r*2, r*2);
68
69 r = 24;
70 QRadialGradient haloGradient(originX, originY, r, originX, originY);
71 haloGradient.setColorAt(0.0, Qt::lightGray);
72 haloGradient.setColorAt(0.8, Qt::darkGray);
73 haloGradient.setColorAt(0.9, Qt::white);
74 haloGradient.setColorAt(1.0, Qt::black);
75
76 painter.setPen(Qt::NoPen);
77 painter.setBrush(haloGradient);
78
79 painter.drawEllipse(originX-r, originY-r, r*2, 2*r);
80
81 unsigned rx = 30,ry = 8;
82 QLinearGradient knobGradient(originX-rx, originY-ry,originX-rx, originY+ry);
83 knobGradient.setColorAt(0.0, Qt::black);
84 knobGradient.setColorAt(0.2, niceBlue);
85 knobGradient.setColorAt(0.3, Qt::lightGray);
86 knobGradient.setColorAt(0.8, Qt::white);
87 knobGradient.setColorAt(1.0, Qt::black);
88
89 painter.setBrush(knobGradient);
90 painter.setPen(thinPen);
91 painter.drawRoundRect(originX-rx,originY-ry, rx*2, ry*2, 49, 99);
92
93
94 for (int i = 0; i < 36; ++i)
95 {
96 if (i%6)
97 {
98 painter.setPen(midPen);
99 painter.drawLine(5,originY, 10,originY);
100 }
101 else
102 {
103 painter.setPen(thickPen);
104 painter.drawLine(5,originY, 13,originY);
105
106 tranform1.translate(25,originY);
107 tranform1.rotate(-90);
108 tranform1.translate(-25,-originY);
109 painter.setWorldTransform(tranform1);
110
111 painter.drawText(22, originY,QString::number(i/6));
112 tranform1.translate(25,originY);
113 tranform1.rotate(90);
114 tranform1.translate(-25,-originY);
115 painter.setWorldTransform(tranform1);
116
117 }
118
119 tranform1.translate(originX,originY);
120 tranform1.rotate(-10);
121 tranform1.translate(-originX,-originY);
122 painter.setWorldTransform(tranform1);
123 }
124 }
125 QSize MySpinButton::sizeHint() const
126 {
127 QSize size = QSize(whirlbuttonHeigth,whirlbuttonWidth);
128 return size;
129 }
130 QSize MySpinButton::minimumSizeHint() const
131 {
132 QSize size = QSize(whirlbuttonHeigth,whirlbuttonWidth);
133 return size;
134 }
135 void MySpinButton::mousePressEvent(QMouseEvent *event)
136 {
137 mouseToPosion(event);
138 this->update();
139 }
140 int MySpinButton :: getDegree()
141 {
142 return(degree);
143 }
144 void MySpinButton::mouseMoveEvent(QMouseEvent * event)
145 {
146 mouseToPosion(event);
147 this->update();
148 }
149 void MySpinButton::mouseReleaseEvent(QMouseEvent * event)
150 {
151 mouseToPosion(event);
152 this->updateDegree();
153 }
154 void MySpinButton:: mouseToPosion(QMouseEvent * event)
155 {
156 QPoint currentPoint = event->pos();
157 double pi = 3.1415927;
158 double x = currentPoint.x() - whirlbuttonHeigth/2;
159 double y = currentPoint.y() - whirlbuttonWidth/2;
160 if((x ==0)&&(y<=0))
161 degree = 90;
162 else if((x==0)&&(y>0))
163 degree = 270;
164 else if(x>0)
165 degree = atan(y/x)*180/pi + 180;
166 else if(y>0)
167 degree = atan(y/x)*180/pi + 360;
168 else
169 degree = atan(y/x)*180/pi;
170 }
View Code
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