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graph.cpp
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graph.cpp
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#include "graph.h"
#include <QFontMetricsF>
#include <QPixmap>
#include <QPainter>
void Graph::paintEvent(QPaintEvent *event)
{
// prep
QPen pen(axis_color);
QFont font;
font.setPointSize(10);
QFontMetricsF fmf(font);
QPointF world_to_screen = {width() / world_size.width(), height() / world_size.height()};
QPixmap frame(size());
frame.fill();
QPainter painter(&frame);
painter.setPen(pen);
painter.setFont(font);
//painter.setRenderHint(QPainter::Antialiasing);
// Axises
double x0 = starting_point.x() * world_to_screen.x();
double y0 = starting_point.y() * world_to_screen.y();
// Ox
painter.drawLine(0, y0, size().width(), y0);
painter.drawLine(size().width(), y0, size().width() - horizontal_arrow.width(), y0 - horizontal_arrow.height());
painter.drawLine(size().width(), y0, size().width() - horizontal_arrow.width(), y0 + horizontal_arrow.height());
painter.drawText(width() - fmf.horizontalAdvance(argument_text), y0 - fmf.height() / 2, argument_text);
// Oy
painter.drawLine(x0, 0, x0, height());
painter.drawLine(x0, 0, x0 + vertical_arrow.width(), vertical_arrow.height());
painter.drawLine(x0, 0, x0 - vertical_arrow.width(), vertical_arrow.height());
painter.drawText(x0 + fmf.horizontalAdvance('1'), fmf.height() / 1.5f, value_text);
// Amplitude
if (amplitude_y > 0)
{
pen.setStyle(Qt::DashLine);
painter.setPen(pen);
// -
painter.drawLine(0, y0 + amplitude_y * world_to_screen.y(), width(), y0 + amplitude_y * world_to_screen.y());
painter.drawText(x0 + fmf.horizontalAdvance('1'), y0 + amplitude_y * world_to_screen.y(), "-" + amplitude_text);
// +
painter.drawLine(0, y0 - amplitude_y * world_to_screen.y(), width(), y0 - amplitude_y * world_to_screen.y());
painter.drawText(x0 + fmf.horizontalAdvance('1'), y0 - amplitude_y * world_to_screen.y(), amplitude_text);
}
double dx = 0;
if (!points.empty())
dx = (graph_size.width() / points.size()) * world_to_screen.x();
// Graph
pen.setColor(graph_color);
pen.setStyle(Qt::SolidLine);
painter.setPen(pen);
for (int i = 0; i < points.size() - 1; ++i)
{
painter.drawLine(x0 + dx * points[i].x(),
y0 - points[i].y() * graph_size.height() * world_to_screen.y(),
x0 + dx * points[i + 1].x(),
y0 - points[i + 1].y() * graph_size.height() * world_to_screen.y());
}
pen.setColor(axis_color);
pen.setStyle(Qt::DashLine);
painter.setPen(pen);
// Special marks x
for (auto& mark : special_marks_x)
{
painter.drawLine(points[mark.first].x() * dx + x0, 0, points[mark.first].x() * dx + x0, height());
painter.drawText(points[mark.first].x() * dx + x0, y0 + fmf.height() / 1.5f, mark.second);
}
// Special marks y
for (auto& mark : special_marks_y)
{
painter.drawLine(0, y0 - mark.first * height(), width(), y0 - mark.first * height());
painter.drawText(x0, y0 - mark.first * height(), mark.second);
}
painter.end();
// copying to Widget canvas
painter.begin(this);
painter.drawPixmap(0, 0, frame);
painter.end();
QWidget::paintEvent(event);
}
Graph::Graph(QWidget *parent) : QWidget{parent}
{
setMinimumSize(400, 300);
}
QSizeF Graph::get_world_size()
{
return world_size;
}
void Graph::set_starting_point(QPointF start)
{
starting_point = start;
}
void Graph::set_graph_size(QSizeF size)
{
graph_size = size;
}
void Graph::set_argument_text(QString text)
{
argument_text = text;
}
void Graph::set_value_text(QString text)
{
value_text = text;
}
void Graph::set_amplitude_text(QString text)
{
amplitude_text = text;
}
void Graph::set_special_marks_x(const QVector<std::pair<int, QString> > &new_marks)
{
special_marks_x = new_marks;
}
void Graph::set_special_marks_y(const QVector<std::pair<double, QString> > &new_marks)
{
special_marks_y = new_marks;
}
void Graph::set_amplitude(double amplitude)
{
amplitude_y = amplitude;
}
void Graph::update_points(const QVector<QPointF> &new_points)
{
points = new_points;
}