/**
* Makes a thumbnail of the specified dimensions, from the specified source image.
*
* @param img The source image.
* @param width The target width of the thumbnail.
* @param height The target height of the thumbnail.
* @return The thumbnail image.
* @throws IllegalStateException If the {@code ThumbnailMaker} is not ready to create thumbnails.
* @throws IllegalArgumentException If the width and/or height is less than or equal to zero.
*/
protected BufferedImage makeThumbnail(BufferedImage img, int width, int height) {
if (!ready.isReady()) {
throw new IllegalStateException(ThumbnailMaker.NOT_READY_FOR_MAKE);
}
if (width <= 0) {
throw new IllegalArgumentException("Width must be greater than zero.");
}
if (height <= 0) {
throw new IllegalArgumentException("Height must be greater than zero.");
}
BufferedImage thumbnailImage = new BufferedImageBuilder(width, height, imageType).build();
Dimension imgSize = new Dimension(img.getWidth(), img.getHeight());
Dimension thumbnailSize = new Dimension(width, height);
Resizer resizer = resizerFactory.getResizer(imgSize, thumbnailSize);
resizer.resize(img, thumbnailImage);
return thumbnailImage;
}
