#include "plotdlg.h"
#include "ui_plotdlg.h"
#include
#include
#include
plotDlg::plotDlg(QList &data, QWidget *parent)
: QDialog(parent), data(data)
{
ui = new Ui::plotDlg();
ui->setupUi(this);
// image
this->setFixedWidth(700);
this->setFixedHeight(400);
image = QImage(700, 400, QImage::Format_RGB32);
QColor background(255, 255, 255);
image.fill(background);
}
plotDlg::~plotDlg()
{
delete ui;
}
void plotDlg::drawLineChart()
{
QPainter painter(&image);
painter.setRenderHint(QPainter::Antialiasing, true); //
//
float coord_x = 50;
float coord_y = 350;
painter.drawLine(QPointF(coord_x, coord_y), QPointF(50, 50));
painter.drawLine(QPointF(coord_x, coord_y), QPointF(650, 350));
float x_max = data.at(0).x();
float y_max = data.at(0).y();
foreach(QPointF point, data)
{
if (point.y() > y_max)
{
y_max = point.y();
}
if (point.x() >x_max)
{
x_max = point.x();
}
}
int width = 600;
int height = 300;
int scale_cnt = 10;
float x_step = (float)width / scale_cnt;
float y_step = (float)height / scale_cnt;
// x
float start_point_x = coord_x;
float start_point_y = coord_y;
float end_point_x = coord_x;
float end_point_y = coord_y + 5;
float x_val = 0;
float y_val = 0;
float x_val_step = (x_max - 0) / scale_cnt;
float y_val_step = (y_max - 0) / scale_cnt;
for (int cnt = 0; cnt < scale_cnt; cnt++)
{
start_point_x += x_step;
end_point_x += x_step;
painter.drawLine(QPointF(start_point_x, start_point_y), QPointF(end_point_x, end_point_y));
x_val += x_val_step;
QFont font = painter.font();
font.setPixelSize(14);
painter.setFont(font);
painter.drawText(QPointF(start_point_x - 7, start_point_y + 18), QString::number((int)x_val));
}
// y
start_point_x = coord_x;
start_point_y = coord_y;
end_point_x = coord_x+5;
end_point_y = coord_y;
for (int cnt = 0; cnt < scale_cnt; cnt++)
{
start_point_y -= y_step;
end_point_y -= y_step;
painter.drawLine(QPointF(start_point_x, start_point_y), QPointF(end_point_x, end_point_y));
y_val += y_val_step;
QFont font = painter.font();
font.setPixelSize(14);
painter.setFont(font);
painter.drawText(QPointF(start_point_x - 18, start_point_y+5), QString::number((int)y_val));
}
// ,
foreach (QPointF point, data)
{
float x_pos = 50 + width / x_max * point.x();
float y_pos = 350 - height / y_max * point.y();
QPen pen;
pen.setColor(Qt::red);
pen.setWidth(6);
painter.setPen(pen);
painter.drawPoint(QPointF(x_pos, y_pos));
}
for (int index = 0; index < data.size() - 1; index++)
{
QPen pen;
pen.setColor(Qt::black);
pen.setWidth(5);
painter.setPen(pen);
float point1_x = 50 + width / x_max * data.at(index).x();
float point1_y = 350 - height / y_max * data.at(index).y();
float point2_x = 50 + width / x_max * data.at(index+1).x();
float point2_y = 350 - height / y_max * data.at(index+1).y();
painter.drawLine(QPointF(point1_x, point1_y), QPointF(point2_x, point2_y));
}
}
void plotDlg::paintEvent(QPaintEvent *event)
{
//
QPainter painter(this);
painter.drawImage(QPoint(0, 0), image);
}
#ifndef PLOTDLG_H
#define PLOTDLG_H
#include
#include
#include
#include
namespace Ui { class plotDlg; };
class plotDlg : public QDialog
{
Q_OBJECT
public:
plotDlg(QList &data, QWidget *parent = Q_NULLPTR);
~plotDlg();
//
void drawLineChart();
private:
Ui::plotDlg *ui;
QList &data;
QImage image;
protected:
void paintEvent(QPaintEvent *event); // paintEvent
};
#endif