Image Scaling

Images.java

public static BufferedImage scaleByWidth(BufferedImage sourceImage, int targetWidth) {

	double factor = (double) targetWidth / (double) sourceImage.getWidth();
	int targetHeight = (int) (sourceImage.getHeight() * factor);

	return scale(sourceImage, targetWidth, targetHeight);
}

public static BufferedImage scaleByHeight(BufferedImage sourceImage, int targetHeight) {

	double factor = (double) targetHeight / (double) sourceImage.getHeight();
	int targetWidth = (int) (sourceImage.getWidth() * factor);

	return scale(sourceImage, targetWidth, targetHeight);
}
  
public static BufferedImage scale(BufferedImage sourceImage, int targetWidth, int targetHeight) {

	BufferedImage targetImage = null;

	if(sourceImage != null) {

		double deltaWidth = (double) targetWidth / (double) sourceImage.getWidth();
		double deltaHeight = (double) targetHeight / (double) sourceImage.getHeight();

		targetImage = new BufferedImage(targetWidth, targetHeight, sourceImage.getType());
		Graphics2D g = targetImage.createGraphics();
		g.scale(deltaWidth, deltaHeight);
		g.drawImage(sourceImage, 0, 0, null);
		g.dispose();
	}

	return targetImage;
}