104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
#include "fyxcircleprogress.h"
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fyxCircleProgress::fyxCircleProgress(QWidget *parent) :
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QWidget(parent)
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{
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setAttribute(Qt::WA_DeleteOnClose);
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m_updateTimer = new QTimer(this);
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m_updateTimer->setInterval(50);//间隔，微妙微单位，大家可以改一下这个值看看转动速度。
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connect(m_updateTimer,SIGNAL(timeout()),this,SLOT(UpdateAngle()));
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m_updateTimer->start();//启动定时器
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m_angle = 0;
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m_outerRadius = 0;
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setWindowFlags(Qt::FramelessWindowHint);//无窗体
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setAttribute(Qt::WA_TranslucentBackground);//背景透明
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}
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void fyxCircleProgress::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHints(QPainter::Antialiasing|QPainter::HighQualityAntialiasing);//设置反锯齿
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drawUnderCircle(&painter);//画外部圆
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// drawBMW(&painter);//画宝马
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}
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void fyxCircleProgress::drawUnderCircle(QPainter *painter)
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{
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painter->save();
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m_outerRadius=width()>height()?(qreal)height()/2-4:(qreal)width()/2-4;//求最小的那个值。自己可以测试一下减4个像素与不减的区别
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QPointF TopLeft(rect().center().x() - m_outerRadius,rect().center().y() - m_outerRadius);
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QPointF BottomRight(rect().center().x() + m_outerRadius,rect().center().y() + m_outerRadius);
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QRectF CircleRect(TopLeft,BottomRight);//大圆矩形
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painter->setPen(Qt::NoPen);//大家可以注释掉这行看一下，有什么差别？
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QRadialGradient CircleGradient(CircleRect.center(),m_outerRadius,CircleRect.center());//设置渐变
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CircleGradient.setColorAt(0.0,OUTER_CIRCLE_START_COLOR);
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CircleGradient.setColorAt(1.0,OUTER_CIRCLE_END_COLOR);
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painter->setBrush(CircleGradient);
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painter->drawEllipse(CircleRect);//画椭圆，其实就是画圆。特殊椭圆而已
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painter->restore();
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}
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void fyxCircleProgress::drawBMW(QPainter *painter)
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{
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painter->save();
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//坐标转换的方法和下面直接用painter的rotate方法一样
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//QTransform t;
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//t.translate(rect().center().x(),rect().center().y());// move to center
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//t.rotate(m_angle,Qt::ZAxis);//绕Z轴旋转
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//painter->setTransform(t);
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painter->translate(rect().center().x(),rect().center().y());// move to center
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painter->rotate(m_angle);//旋转
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qreal InnerRadius = m_outerRadius * RADIUS_FACTOR;//内半径
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QPointF tTopLeft( -InnerRadius,-InnerRadius);
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QPointF tBottomRight(InnerRadius,InnerRadius);
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QRectF tRect(tTopLeft,tBottomRight);
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qreal dAngle = 90 * 16;//为什么乘以16？自己查看文档怎么画pie的。
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qreal StartAngle = 0;
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painter->setPen(Qt::NoPen);
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for(int AngleIndex = 0; AngleIndex < 4;AngleIndex++)
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{
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//交叉蓝色白色
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QRadialGradient PieGradient(tRect.center(),m_outerRadius,tRect.center());
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if(AngleIndex%2)//蓝色
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{
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PieGradient.setColorAt(0.0,BLUE_CIRCLE_START_COLOR);
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PieGradient.setColorAt(1.0,BLUE_CIRCLE_END_COLOR);
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}
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else//白色
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{
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PieGradient.setColorAt(0.0,WHITE_CIRCLE_START_COLOR);
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PieGradient.setColorAt(1.0,WHITE_CIRCLE_END_COLOR);
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}
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painter->setBrush(PieGradient);
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painter->drawPie(tRect,StartAngle,dAngle);
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//角度增加90度
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StartAngle += dAngle;
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}
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painter->restore();
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}
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void fyxCircleProgress::UpdateAngle()
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{
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m_angle += 1;
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if(m_angle > 360)
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{
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m_angle = 0;
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}
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//m_angle = ((m_angle + 1) % 360);与上面几行功能一样
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update();//刷新控件，会调用paintEvent函数
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}
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