painter2D.rar_qt绘图_qwt

#include "widget.h" #include "ui_widget.h" #include <QPainter> #include <QMouseEvent> #include <QToolTip> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); setMouseTracking(true); } Widget::~Widget() { delete ui; } void Widget::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.drawLine(QPoint(0,0),QPoint(100,100)); QPen pen(Qt::yellow,3,Qt::SolidLine,Qt::RoundCap,Qt::RoundJoin); painter.setPen(pen); QRect rectangle(70,40,600,600); int startangle = 0*16; int spanangle = 360*16; painter.drawArc(rectangle,startangle,spanangle); QConicalGradient conicalGradient(QPointF(350,190),90); conicalGradient.setColorAt(0,Qt::black); conicalGradient.setColorAt(0.5,Qt::red); painter.setBrush(conicalGradient); painter.drawEllipse(QPoint(350,190),50,50); } void Widget::mouseMoveEvent(QMouseEvent *event) { QString pos = QString("%1,%2").arg(event->pos().x()).arg(event->pos().y()); QToolTip::showText(event->globalPos(),pos,this); }