Qt实现汽车仪表盘
/*
* 画刻度值
*/
void Widget::drawScaleValue(QPainter &painter, int radius)
{
//设置字体类型和大小
QFont textFont("Arial",15);
//设置粗体
textFont.setBold(true);
painter.setFont(textFont);
int text_r = radius - 49;
for(int i=0; i<=60; i++)
{
if(i%5 == 0)
{
if(i>=40)
{
painter.setPen(QPen(Qt::red, 5));
}
//保存当前坐标系
painter.save();
int delX = qCos((210-angle*i)*M_PI/180) * text_r;
int delY = qSin(qDegreesToRadians(210-angle*i)) * text_r;
//平移坐标系
painter.translate(QPoint(delX,-delY));
//旋转坐标系
painter.rotate(-120+angle*i);
//写上刻度值，文字居中
painter.drawText(-25,-25,50,30,Qt::AlignCenter,QString::number(i*4));
//恢复坐标系
painter.restore();
}
}
painter.setPen(QPen(Qt::white, 5));
}