#include <QPainter>

#include "imagewidget.h"

void ImageWidget::paintEvent(QPaintEvent *event)
{
	QLabel::paintEvent(event);
	displayImage();
}

void ImageWidget::setPixmap(QPixmap image)
{
	sourceImage = image;
	currentImage = image;
	repaint();
}

void ImageWidget::displayImage()
{
	if (sourceImage.isNull())
		return;

	float cw = width(), ch = height();
	float pw = currentImage.width(), ph = currentImage.height();

	if(pw > cw && ph > ch && pw/cw > ph/ch ||
		pw > cw && ph <= ch ||
		pw < cw && ph < ch && cw/pw < ch/ph)
		currentImage = sourceImage.scaledToWidth(cw, Qt::TransformationMode::FastTransformation);
	else if(pw > cw && ph > ch && pw/cw <= ph/ch ||
			ph > ch && pw <= cw ||
			pw < cw && ph < ch && cw/pw > ch/ph)
		currentImage = sourceImage.scaledToHeight(ch, Qt::TransformationMode::FastTransformation);

	int x = (cw - currentImage.width())/2, y = (ch - currentImage.height())/2;

	QPainter paint(this);
	paint.drawPixmap(x, y, currentImage);
}