qt painter多个点的曲线

Posted 2021-01-17 一起来看流星雨

plot.h

#ifndef PLOT_H

#define PLOT_H

#include<QTimer>

#include <QWidget>

class pathplot : public QWidget

{

  Q_OBJECT

public:

  explicit pathplot(QWidget *parent = nullptr);

  void paintEvent(QPaintEvent *event);

};

#endif // PLOT_H

plot.cpp

# include"circlewidget.h"
#include<QPainter>
#include<QDebug>
#include<math.h>

plot::CircleWidget(QWidget *parent):QFrame(parent)
{
        m_period = 20;  //周期
        m_grain = 1;    //粒度
        m_radius = 10; // 振幅
}
plot::~CircleWidget()
{

}

void pathplot::paintEvent(QPaintEvent *event) {

QPainter painter(this);

    QPointF pointf[10];
    pen.setWidth(6);
    painter.setPen(pen); // 设置画笔
    for (int i=0; i<10; ++i)
    {
        pointf[i].setX(2.0+i*10.0);
        pointf[i].setY(130.0);
    }

   painter.drawPoints(pointf, 10);

}