46 lines
881 B
C++
46 lines
881 B
C++
#include "widget.h"
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#include "ui_widget.h"
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#include "qpainter.h"
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#include "qevent.h"
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#include "qdebug.h"
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Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
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{
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ui->setupUi(this);
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this->setMouseTracking(true);
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}
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Widget::~Widget()
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{
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delete ui;
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}
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void Widget::mouseMoveEvent(QMouseEvent *event)
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{
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lastPos = event->pos();
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update();
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}
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void Widget::mouseReleaseEvent(QMouseEvent *event)
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{
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//这里是鼠标按下的坐标,自己存到数据库
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lastPos = event->pos();
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update();
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qDebug() << lastPos;
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}
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void Widget::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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QPen pen;
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pen.setWidth(5);
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pen.setColor(Qt::red);
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painter.setPen(pen);
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//绘制横向线
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painter.drawLine(0, lastPos.y(), width(), lastPos.y());
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//绘制纵向线
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painter.drawLine(lastPos.x(), 0, lastPos.x(), height());
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}
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