initial commit

imagewidget.cpp

@@ -0,0 +1,39 @@
+#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);
+}