void VUMeter::drawBar(QPainter *painter)
{
painter->save();
QLinearGradient linGrad(50, 0, 50, 500);
linGrad.setColorAt(0, colorHigh);
linGrad.setColorAt(1, colorLow);
linGrad.setSpread(QGradient::PadSpread);
painter->setBrush(linGrad);
//绘制柱状条
QRectF bar3(20, 50, 25, 450);
painter->drawRect(bar3);
QRectF bar4(55, 50, 25, 450);
painter->drawRect(bar4);
//绘制柱状背景
painter->setBrush(QColor(40, 40, 40));
double length = 450.0;
double leftBar = abs(length * (minValue - leftValue) / (maxValue - minValue));
double rightBar = abs(length * (minValue - rightValue) / (maxValue - minValue));
QRectF bar1(20, 50, 25, 450 - leftBar);
painter->drawRect(bar1);
QRectF bar2(55, 50, 25, 450 - rightBar);
painter->drawRect(bar2);
painter->setPen(QPen(Qt::black, 2));
for (int i = 0; i <= 60; i++) {
painter->drawLine(21, 500 - 450 * i / 60, 44, 500 - 450 * i / 60);
painter->drawLine(56, 500 - 450 * i / 60, 79, 500 - 450 * i / 60);
}
painter->restore();
}
int main (void)
{
// non-lazy reference to foo2
p = &foo2;
// lazy reference to foo4
foo4();
// non-lazy reference to bar2
p = &bar2;
// lazy reference to bar4 and bar1
bar4();
bar1();
return 0;
}
void QVUMeter::paintBar()
{
QPainter painter(this);
painter.setWindow(0, 0, 100, 540);
painter.setRenderHint(QPainter::Antialiasing);
QLinearGradient linGrad(50, 0, 50, 500);
linGrad.setColorAt(0, colHigh);
linGrad.setColorAt(1, colLow);
linGrad.setSpread(QGradient::PadSpread);
painter.setBrush(linGrad);
// draw color bar
QRectF bar3(20, 50, 25, 450);
painter.drawRect(bar3);
QRectF bar4(55, 50, 25, 450);
painter.drawRect(bar4);
// draw background bar
painter.setBrush(QColor(40, 40, 40));
double length = 450.0;
double leftBar = abs(length * (min-leftVal)/(max-min));
double rightBar = abs(length * (min-rightVal)/(max-min));
QRectF bar1(20, 50, 25, 450-leftBar);
painter.drawRect(bar1);
QRectF bar2(55, 50, 25, 450-rightBar);
painter.drawRect(bar2);
painter.setPen(QPen(Qt::black, 2));
for (int i = 0; i <=60; i++)
{
painter.drawLine(21, 500-450*i/60, 44, 500-450*i/60);
painter.drawLine(56, 500-450*i/60, 79, 500-450*i/60);
}
}
void prime4(void)
{
bar4(); /* { dg-warning "implicit declaration of function" } */
}
