本文实例为大家分享了Qt自定义控件实现线条型加载条的具体代码，供大家参考，具体内容如下
上效果图：
思路：先画一个线条，然后旋转坐标系再画其他线条，突出颜色的线条可以画死再旋转，也可以按照角度递增让特定线画突出颜色（这里使用的是这种）。
LoadingBarA::LoadingBarA(QWidget *parent) :
QWidget(parent)
{
timer = new QTimer(this); //定时器
timer->setInterval(50);
connect(timer,QTimer::timeout,this,[=](){
if(pointRect<=rectCount){
pointRect++;
}else{
pointRect = pointRect%rectCount;
}
update();
});
}
void LoadingBarA::paintEvent(QPaintEvent *event){ //重绘事件
int width = this->width();
int height = this->height();
int side = qMin(width, height);
QPainter painter(this);
painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
painter.translate(width / 2, height / 2);
painter.scale(side / 200.0, side / 200.0);
float degree = 360.0/rectCount; //rectCount:共有多少根线条
for(int i =0;i<rectCount;i++){
painter.rotate(degree);
if(i == pointRect - 1){
drawRect(&painter,darkColor); //突出颜色
}else{
drawRect(&painter,lightColor);//非突出颜色
}
}
}
void LoadingBarA::drawRect(QPainter* painter,QColor color){//画线条
painter->save();
painter->setPen(Qt::NoPen);
painter->setBrush(color);
QRect rect(arcLength,-rectHeight/2,rectWidth,rectHeight);
painter->drawRoundedRect(rect,rectHeight/2,rectHeight/2);
painter->restore();
}
void LoadingBarA::setDarkColor(QColor tempColor){
this->darkColor = tempColor;
update();
}
void LoadingBarA::setLightColor(QColor lightColor){
this->lightColor = lightColor;
update();
}
void LoadingBarA::setRectWidth(int l){
this->rectWidth = l;
update();
}
void LoadingBarA::setRectHeight(int l){
this->rectHeight = l;
update();
}
void LoadingBarA::setArcLength(int l){
this->arcLength = l;
update();
}
void LoadingBarA::setRectCount(int l){
this->rectCount = l;
update();
}
void LoadingBarA::startLoading(){ //设置开始
timer->start();
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
