#include "renderarea.h"
#include <QPainter>

RenderArea::RenderArea(QWidget *parent) :
	QWidget{parent},
	mBackgroundColour{36,35,35},
	mShapeColour{251,250,250},
	mShape{Astroid}
{

}

QPointF RenderArea::ComputeAstroid(float t){
	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};
	return QPointF{x,y};
}

QSize RenderArea::minimumSizeHint() const
{
	return QSize(100,100);
}

QSize RenderArea::sizeHint() const
{
	return QSize(400,200);
}

void RenderArea::paintEvent(QPaintEvent* event)
{
	QPainter painter{this};
	painter.setRenderHint(QPainter::Antialiasing,true);

	switch (mShape) {
		case Astroid:
			mBackgroundColour = Qt::red;
		break;
		case Cycloid:
			mBackgroundColour = Qt::green;

		break;
		case HuygensCycloid:
			mBackgroundColour = Qt::blue;

		break;
		case HypoCycloid:
			mBackgroundColour = Qt::yellow;

		break;
		default:
		break;
	}
	painter.setBrush(mBackgroundColour);
	painter.setPen(mShapeColour);

	painter.drawRect(this->rect());

	QPoint center{this->rect().center()};
	int stepCount{1024};
	double scale{40},intervalLenght{2 * M_PI},step{intervalLenght / stepCount};
	for(float t = 0; t < intervalLenght; t += step){
		QPointF point = ComputeAstroid(t);

		QPoint pixel;
		pixel.setX(point.x() * scale + center.x());
		pixel.setY(point.y() * scale + center.y());

		painter.drawPoint(pixel);
	}
}