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package com.explodingpixels.widgets;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
/**
* A utility class for working with {@link Image}s.
*/
public class ImageUtils {
private ImageUtils() {
// utility class - no constructor needed.
}
public static BufferedImage getHorizontalSubImage(Image image, int x, int width) {
return getSubImage(image, x, 0, width, image.getHeight(null));
}
public static BufferedImage getVerticalSubImage(Image image, int y, int height) {
return getSubImage(image, 0, y, image.getWidth(null), height);
}
public static BufferedImage getSubImage(Image image, int x, int y, int width, int height) {
if (x >= image.getWidth(null)) {
throw new IllegalArgumentException("The given x, " + x + ", must be less than the image width, " + width + ".");
}
if (y >= image.getHeight(null)) {
throw new IllegalArgumentException("The given y, " + y + ", must be less than the image height, " + height + ".");
}
if (x + width > image.getWidth(null)) {
throw new IllegalArgumentException(
"The given width must be less than or equal to the image width - x.");
}
if (y + height > image.getHeight(null)) {
throw new IllegalArgumentException(
"The given height must be less than or equal to the image height - y.");
}
BufferedImage subImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
Graphics graphics = subImage.getGraphics();
graphics.drawImage(image, 0, 0, subImage.getWidth(), subImage.getHeight(),
x, y, x + width, y + height, null);
graphics.dispose();
return subImage;
}
}
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