QT QPainter基本绘图应用程序示例

#include "widget.h" #include "ui_widget.h" #include <QPainter> void Widget::myDrawFilledRect() {//基本绘图 QPainter painter(this);//创建QPainter对象 painter.setRenderHint(QPainter::Antialiasing);// painter.setRenderHint(QPainter::TextAntialiasing);// int W=this->width(); //绘图区宽度 int H=this->height(); //绘图区高度 QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框 //设置画笔 QPen pen; pen.setWidth(3); //线宽 pen.setColor(Qt::red); //划线颜色 //Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等 //Qt::FlatCap, Qt::SquareCap,Qt::RoundCap pen.setCapStyle(Qt::FlatCap);//线端点样式 //Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式 painter.setPen(pen); //设置画刷 // QPixmap texturePixmap(":images/images/texture.jpg"); QBrush brush; brush.setColor(Qt::yellow); //画刷颜色 brush.setStyle(Qt::SolidPattern); //画刷填充样式 // brush.setStyle(Qt::TexturePattern); //画刷填充样式 // brush.setTexture(texturePixmap); //设置材质图片 painter.setBrush(brush); //Qt::NoBrush,Qt::SolidPattern,Qt::Dense1Pattern,Qt::Dense2Pattern,..,Qt::Dense7Pattern,Qt::HorPattern // Qt::VerPattern, Qt::CrossPattern, Qt::BDiagPattern,Qt::FDiagPattern,Qt::DiagCrossPattern, // Qt::LinearGradientPattern,Qt::ConicalGradientPattern,Qt::RadialGradientPattern // Qt::TexturePattern //绘图 // painter.drawLine(rect.left(),rect.top(),rect.right(),rect.bottom()); painter.drawRect(rect); //只填充定义的渐变区域 // painter.drawRect(this->rect()); //填充更大区域，会有延展效果 // painter.fillRect(rect,Qt::red); // painter.drawRoundRect(rect); // painter.drawRoundedRect(rect,40,20); // painter.drawEllipse(rect); // painter.drawPolyline(points,9); // painter.drawPolygon(points,9); // painter.drawPoints(points,9); // painter.translate(100,300); // painter.drawPath(starPath); // painter.translate(200,0); // painter.drawPath(starPath); // painter.translate(200,0); // painter.drawPath(starPath); // painter.drawArc(rect,30*16,80*16); // painter.drawChord(rect,90*16,120*16); // painter.drawPie(rect,90*16,120*16); // painter.drawText(rect,"Hello, QT"); } void Widget::myDrawTextureRect() { QPainter painter(this);//创建QPainter对象 painter.setRenderHint(QPainter::Antialiasing);// painter.setRenderHint(QPainter::TextAntialiasing);// int W=this->width(); //绘图区宽度 int H=this->height(); //绘图区高度 QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框 //设置画笔 QPen pen; pen.setWidth(3); //线宽 pen.setColor(Qt::red); //划线颜色 //Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等 //Qt::FlatCap, Qt::SquareCap,Qt::RoundCap pen.setCapStyle(Qt::FlatCap);//线端点样式 //Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式 painter.setPen(pen); //设置画刷 QPixmap texturePixmap(":images/images/texture.jpg"); QBrush brush; // brush.setColor(Qt::yellow); //画刷颜色 // brush.setStyle(Qt::SolidPattern); //画刷填充样式 brush.setStyle(Qt::TexturePattern); //画刷填充样式 brush.setTexture(texturePixmap); //设置材质图片 painter.setBrush(brush); //绘图 painter.drawRect(rect); //只填充定义的渐变区域 } void Widget::myDrawGradient() { QPainter painter(this);//创建QPainter对象 painter.setRenderHint(QPainter::Antialiasing);// painter.setRenderHint(QPainter::TextAntialiasing);// int W=this->width(); //绘图区宽度 int H=this->height(); //绘图区高度 QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框 //设置画笔 // QPen pen; // pen.setStyle(Qt::NoPen);//线的类型，实线、虚线等 // painter.setPen(pen); //线性渐变 // QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.bottom()); //对角线 QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.top());//从左到右 linearGrad.setColorAt(0,Qt::blue);//起点颜色 linearGrad.setColorAt(0.5,Qt::green);//起点颜色 linearGrad.setColorAt(1,Qt::red);//终点颜色 linearGrad.setSpread(QGradient::ReflectSpread); //展布模式 //QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread painter.setBrush(linearGrad); //径向渐变 // QRadialGradient radialGrad(W/2,H/2,qMax(W/8,H/8),W/2,H/2); //// radialGrad.setColorAt(0,Qt::white); // radialGrad.setColorAt(0,Qt::green); // radialGrad.setColorAt(1,Qt::blue); // radialGrad.setSpread(QGradient::ReflectSpread); // //QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread // painter.setBrush(radialGrad); //圆锥型渐变 // QConicalGradient coniGrad(W/2,H/2,45); // coniGrad.setColorAt(0,Qt::yellow); // coniGrad.setColorAt(0.5,Qt::blue); // coniGrad.setColorAt(1,Qt::green); //// coniGrad.setSpread(QGradient::PadSpread); //对于锥形渐变不起作用 // painter.setBrush(coniGrad); //绘图 // painter.drawRect(rect); //只填充定义的渐变区域 painter.drawRect(this->rect()); //填充更大区域，会有延展效果 } void Widget::total() { QPainter painter(this);//创建QPainter对象 painter.setRenderHint(QPainter::Antialiasing);// painter.setRenderHint(QPainter::TextAntialiasing);// int W=this->width(); //绘图区宽度 int H=this->height(); //绘图区高度 QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框 // QPoint points[9]={ // QPoint(5*W/12,H/4), // QPoint(7*W/12,H/4), // QPoint(3*W/4,5*H/12), // QPoint(3*W/4,7*H/12), // QPoint(7*W/12,3*H/4), // QPoint(5*W/12,3*H/4), // QPoint(W/4,7*H/12), // QPoint(W/4,5*H/12), // QPoint(5*W/12,H/4) // }; // QPainterPath path; // path.addRect(rect); // path.addEllipse(rect); // path.moveTo(points[0]); // path.lineTo(points[4]); // path.moveTo(points[1]); // path.lineTo(points[5]); // path.moveTo(points[2]); // path.lineTo(points[6]); // path.moveTo(points[3]); // path.lineTo(points[7]); // painter.scale(width() / 100.0, height() / 100.0); // painter.translate(50.0, 50.0); // qreal R=100; //半径 // const qreal Pi=3.14159; // qreal deg=Pi*72/180;// // QPoint points[5]={ // QPoint(R,0), // QPoint(R*std::cos(deg),-R*std::sin(deg)), // QPoint(R*std::cos(2*deg),-R*std::sin(2*deg)), // QPoint(R*std::cos(3*deg),-R*std::sin(3*deg)), // QPoint(R*std::cos(4*deg),-R*std::sin(4*deg)), // }; // QPainterPath starPath; // starPath.moveTo(points[0]); // starPath.lineTo(points[2]); // starPath.lineTo(points[4]); // starPath.lineTo(points[1]); // starPath.lineTo(points[3]); // starPath.closeSubpath(); //绘制曲线 // path.moveTo(points[0]); // path.cubicTo(points[1],points[4],points[2]); //设置字体 // QFont font; // font.setPointSize(30); // font.setBold(true); // painter.setFont(font); //设置画笔 QPen pen; pen.setWidth(3); //线宽 pen.setColor(Qt::red); //划线颜色 //Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine pen.setStyle(Qt::SolidLine);//线的类型，实线、虚