彻底改版2.0

other/mouseline/widget.cpp

@@ -0,0 +1,45 @@
+#include "widget.h"
+#include "ui_widget.h"
+#include "qpainter.h"
+#include "qevent.h"
+#include "qdebug.h"
+
+Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+    this->setMouseTracking(true);
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}
+
+void Widget::mouseMoveEvent(QMouseEvent *event)
+{
+    lastPos = event->pos();
+    update();
+}
+
+void Widget::mouseReleaseEvent(QMouseEvent *event)
+{
+    //这里是鼠标按下的坐标,自己存到数据库
+    lastPos = event->pos();
+    update();
+    qDebug() << lastPos;
+}
+
+void Widget::paintEvent(QPaintEvent *)
+{
+    QPainter painter(this);
+
+    QPen pen;
+    pen.setWidth(5);
+    pen.setColor(Qt::red);
+    painter.setPen(pen);
+
+    //绘制横向线
+    painter.drawLine(0, lastPos.y(), width(), lastPos.y());
+    //绘制纵向线
+    painter.drawLine(lastPos.x(), 0, lastPos.x(), height());
+}