昨天在玩手机游戏时,见到一个游戏的饼状投票统计图很漂亮,所以我今天也花了一个下午来实现了一个类似的程序娱乐一下,呵呵。
思路:
1:将窗体设为Qt::FramelessWindowHint和Qt::WA_TranslucentBackground(去掉标题栏,背景透明)。
2:重载程序的鼠标事件(移动程序)和键盘事件(模拟投票和退出)。
3:根据投票结果,在paintEvent函数中画几个扇形和其他东西。
操作说明:
1:按数字键0-9模拟投票。
2:按ESC键退出程序。
运行时截图(浅绿色的是桌面背景):
源代码:
[cpp] view plaincopyprint?
- #include <QtGui>
- class PieDialog : public QDialog
- {
- Q_OBJECT
- private:
- int m_Result[10];
- QColor m_Color[10];
- QPoint m_CurrentPos;
- protected:
- void mousePressEvent(QMouseEvent *event);
- void mouseMoveEvent(QMouseEvent *event);
- void paintEvent(QPaintEvent *event);
- void enterEvent(QEvent *event);
- void leaveEvent(QEvent *event);
- void keyPressEvent(QKeyEvent *event);
- public:
- PieDialog(QWidget *parent = 0);
- };
- PieDialog::PieDialog(QWidget *parent /* = 0 */)
- : QDialog(parent)
- {
- m_Color[0] = Qt::red;
- m_Color[1] = Qt::green;
- m_Color[2] = Qt::blue;
- m_Color[3] = Qt::cyan;
- m_Color[4] = Qt::magenta;
- m_Color[5] = Qt::yellow;
- m_Color[6] = Qt::darkYellow;
- m_Color[7] = Qt::darkRed;
- m_Color[8] = Qt::darkGreen;
- m_Color[9] = Qt::darkCyan;
- qMemSet(m_Result, 0, sizeof(m_Result));
- setWindowTitle("Pie Dialog");
- setFixedSize(400, 300);
- //让程序背景透明
- setWindowFlags( Qt::FramelessWindowHint );
- setAttribute(Qt::WA_TranslucentBackground, true);
- }
- void PieDialog::mousePressEvent(QMouseEvent *event)
- {
- //按住左键可以托动窗口
- if(event->button() == Qt::LeftButton)
- {
- m_CurrentPos = event->globalPos() - frameGeometry().topLeft();
- event->accept();
- }
- QDialog::mousePressEvent(event);
- }
- void PieDialog::mouseMoveEvent(QMouseEvent *event)
- {
- if (event->buttons() && Qt::LeftButton)
- {
- move(event->globalPos() - m_CurrentPos);
- event->accept();
- }
- QDialog::mouseMoveEvent(event);
- }
- void PieDialog::keyPressEvent(QKeyEvent *event)
- {
- //按数字键1-0相当于投票
- for(int i=0; i<10; i++)
- {
- if( Qt::Key_0+i == event->key() )
- {
- m_Result[i]++;
- break;
- }
- }
- update();
- QDialog::keyPressEvent(event);
- }
- void PieDialog::paintEvent(QPaintEvent *event)
- {
- QPainter painter(this);
- //反走样
- painter.setRenderHint(QPainter::Antialiasing, true);
- int cy = 10;
- //先画出颜色图解
- for(int i=0; i<10; i++)
- {
- painter.setBrush( m_Color[i] );
- painter.drawRect(320, cy, 30, 20);
- painter.drawText( QPoint(360, cy+15), QString::number(i) );
- cy += 28;
- }
- painter.setPen( QPen(Qt::black, 1) );
- const int FULL_CIRCLE = 5760;
- const int RADIUS = 140;
- QRect rect(10, 10, 280, 280);
- int count = 0;
- for(int i=0; i<10; i++)
- {
- count += m_Result[i];
- }
- //如果还没有投过票,那就先画一个白色的圆形
- if( 0 == count )
- {
- painter.setBrush( Qt::white );
- painter.drawEllipse(rect);
- return;
- }
- int pos = 0;
- int angle;
- for(int i=0; i<10; i++)
- {
- if( 0 == m_Result[i] )
- continue;
- painter.setBrush( m_Color[i] );
- double persent = (double)m_Result[i] / count;
- angle = FULL_CIRCLE * persent;
- //画出各个对应的扇形
- double abc = 3.14 * 2 * (double)(pos + angle/2) / FULL_CIRCLE;
- double tx = 100 * qCos(abc) + 10 + RADIUS;
- double ty = -100 * qSin(abc) + 10 + RADIUS;
- painter.drawPie(rect, pos, angle);
- //在扇形上写注释(投票数和百分比)
- QString temp;
- temp.sprintf(" (%d) ", m_Result[i]);
- painter.drawText(tx-20, ty-10, temp);
- temp.sprintf("%0.1lf%%", persent*100);
- painter.drawText(tx-20, ty, temp);
- pos += angle;
- }
- }
- void PieDialog::leaveEvent(QEvent *event)
- {
- //鼠标离开窗口时是普通的指针
- setCursor(Qt::ArrowCursor);
- }
- void PieDialog::enterEvent(QEvent *event)
- {
- //鼠标留在窗口上时是一个手指
- setCursor(Qt::PointingHandCursor);
- }
- #include "main.moc"
- int main(int argc, char *argv[])
- {
- QApplication app(argc, argv);
- PieDialog *dialog = new PieDialog;
- dialog->show();
- return app.exec();
- }
http://blog.csdn.net/small_qch/article/details/7607491
时间: 2024-10-19 16:33:55