70 lines
1.3 KiB
C++
70 lines
1.3 KiB
C++
#include "renderarea.h"
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#include <QPainter>
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RenderArea::RenderArea(QWidget *parent) :
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QWidget{parent},
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mBackgroundColour{36,35,35},
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mShapeColour{251,250,250},
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mShape{Astroid}
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{
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}
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QPointF RenderArea::ComputeAstroid(float t){
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double cos_t{cos(t)},sin_t{sin(t)},x{2*cos_t*cos_t*cos_t},y{2*sin_t*sin_t*sin_t};
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return QPointF{x,y};
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}
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QSize RenderArea::minimumSizeHint() const
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{
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return QSize(100,100);
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}
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QSize RenderArea::sizeHint() const
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{
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return QSize(400,200);
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}
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void RenderArea::paintEvent(QPaintEvent* event)
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{
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QPainter painter{this};
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painter.setRenderHint(QPainter::Antialiasing,true);
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switch (mShape) {
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case Astroid:
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mBackgroundColour = Qt::red;
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break;
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case Cycloid:
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mBackgroundColour = Qt::green;
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break;
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case HuygensCycloid:
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mBackgroundColour = Qt::blue;
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break;
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case HypoCycloid:
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mBackgroundColour = Qt::yellow;
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break;
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default:
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break;
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}
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painter.setBrush(mBackgroundColour);
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painter.setPen(mShapeColour);
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painter.drawRect(this->rect());
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QPoint center{this->rect().center()};
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int stepCount{1024};
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double scale{40},intervalLenght{2 * M_PI},step{intervalLenght / stepCount};
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for(float t = 0; t < intervalLenght; t += step){
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QPointF point = ComputeAstroid(t);
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QPoint pixel;
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pixel.setX(point.x() * scale + center.x());
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pixel.setY(point.y() * scale + center.y());
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painter.drawPoint(pixel);
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}
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}
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