/**
* Returns the preferred size of this Thumbnail. The preferred size will be calculated in a way
* that maintains the source Figure's aspect ratio.
*
* @param wHint The width hint
* @param hHint The height hint
* @return The preferred size
*/
public Dimension getPreferredSize(int wHint, int hHint) {
if (prefSize == null) return adjustToAspectRatio(getBounds().getSize(), false);
Dimension preferredSize = adjustToAspectRatio(prefSize.getCopy(), true);
if (maxSize == null) return preferredSize;
Dimension maximumSize = adjustToAspectRatio(maxSize.getCopy(), true);
if (preferredSize.contains(maximumSize)) return maximumSize;
else return preferredSize;
}
/**
* Returns the scaled Image of the source Figure. If the Image needs to be updated, the
* ThumbnailUpdater will notified.
*
* @return The thumbnail image
*/
protected Image getThumbnailImage() {
Dimension oldSize = targetSize;
targetSize = getPreferredSize();
targetSize.expand(new Dimension(getInsets().getWidth(), getInsets().getHeight()).negate());
setScales(
targetSize.width / (float) getSourceRectangle().width,
targetSize.height / (float) getSourceRectangle().height);
if ((isDirty()) && !updater.isRunning()) updater.start();
else if (oldSize != null && !targetSize.equals(oldSize)) {
revalidate();
updater.restart();
}
return thumbnailImage;
}
private Dimension adjustToAspectRatio(Dimension size, boolean adjustToMaxDimension) {
Dimension sourceSize = getSourceRectangle().getSize();
Dimension borderSize = new Dimension(getInsets().getWidth(), getInsets().getHeight());
size.expand(borderSize.getNegated());
int width, height;
if (adjustToMaxDimension) {
width =
Math.max(
size.width, (int) (size.height * sourceSize.width / (float) sourceSize.height + 0.5));
height =
Math.max(
size.height, (int) (size.width * sourceSize.height / (float) sourceSize.width + 0.5));
} else {
width =
Math.min(
size.width, (int) (size.height * sourceSize.width / (float) sourceSize.height + 0.5));
height =
Math.min(
size.height, (int) (size.width * sourceSize.height / (float) sourceSize.width + 0.5));
}
size.width = width;
size.height = height;
return size.expand(borderSize);
}