1 #include "plot.h"

     2 

     3 const QPointF Plot::zero(0, 0);

     4 

     5 

     6 Plot::Plot(QObject *parent)

     7     : QGraphicsScene(parent)

     8 {

     9 }

    10 

    11 void Plot::setXAxis(qreal min, qreal max, qreal step)

    12 {

    13     addLine(QLineF(zero, QPointF(max - min, 0)));

    14     if (!step) return;

    15 

    16     QLineF tick(QPointF(0, 0), QPointF(0, 4));

    17     addLine(tick);

    18 

    19     for (qreal i = 0; i < max - min; i+= step) {

    20 	tick.translate(step, 0);

    21 	addLine(tick);

    22     }

    23 

    24 }

    25 

    26 void Plot::setYAxis(qreal min, qreal max, qreal step)

    27 {

    28     addLine(QLineF(zero, QPointF(0, -1 * (max - min))));

    29     if (!step) return;

    30 }