虚拟示波器，要使用Qchart进行处理

App/ComponentUI/Scope/VirtualScope.cpp

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+#include "VirtualScope.h"
+
+
+
+VirtualScope::VirtualScope(QWidget *parent) : QWidget(parent)
+{
+
+}
+
+VirtualScope::~VirtualScope()
+{
+
+}
+
+void VirtualScope::mouseReleaseEvent(QMouseEvent *e)
+{
+    qDebug() << "VirtualScope release" << e;
+}
+
+void VirtualScope::mousePressEvent(QMouseEvent *e)
+{
+    qDebug() << "VirtualScope press" << e;
+}
+
+void VirtualScope::mouseDoubleClickEvent(QMouseEvent *e)
+{
+    qDebug() << "VirtualScope double clicked" << e;
+}
+
+void VirtualScope::wheelEvent(QWheelEvent *e)
+{
+    qDebug() << e;
+}
+
+
+
+void VirtualScope::paintEvent(QPaintEvent *)
+{
+    //qreal scale = 4000.0;
+
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing); 	/* 使用反锯齿(如果可用) */
+    painter.setRenderHint(QPainter::TextAntialiasing);
+    painter.setRenderHint(QPainter::SmoothPixmapTransform);
+
+    painter.translate(width() / 2,  height() / 2);	/* 坐标变换为窗体中心 */
+    //int side = qMin(width(), height());                 /* 这一句决定了这个模块只能是方形 */
+    //painter.scale(side / scale, side / scale);	/* 比例缩放 */
+    painter.setPen(Qt::NoPen);
+
+    drawBackground(&painter);
+
+}
+
+
+void VirtualScope::drawBackground(QPainter *painter)
+{
+     QPen pen;
+     QFont font;
+
+     float w = width();
+     float h = height();
+
+     //画大黑背景
+     painter->save();
+     painter->setBrush(Qt::black);
+     painter->drawRect(-w/2,-h/2,w,h);
+     painter->restore();
+
+
+     //画坐标系
+     painter->save();
+
+     //painter->translate(-200,0);
+
+     //水平，垂直虚线
+     pen.setColor(QColor("#FFFFFF"));
+     pen.setWidthF(1);
+     painter->setPen(pen);
+
+     font.setPointSize(15);
+     font.setFamily("Arial");//非衬线
+     painter->setFont(font);
+
+     //水平分成8个格,竖直分成10个格
+     float g_h = (h - 50)/8;
+     float g_w = (w - 50)/10;
+
+     for(int i = -4;i <= 4;i++)
+     {
+        painter->drawLine(-(w - 50)/2,g_h * i,(w - 50)/2,g_h * i);
+     }
+
+     //水平分成10条线
+     for(int i = -5;i <= 5;i++)
+     {
+        painter->drawLine(g_w * i,-(h - 50)/2,g_w * i,(h - 50)/2);
+        painter->drawText(QRect(g_w * i - 100,(h - 50)/2,200,20), Qt::AlignCenter,QString::number(i));
+     }
+
+     painter->restore();
+
+
+
+}
+
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