public abstract void saveAsImage(Image img, File target, String format)
throws IOException;
+ /**
+ * Scale a dimension.
+ *
+ * @param areaWidth
+ * the base width of the target dimension for snap sizes
+ * @param areaHeight
+ * the base height of the target dimension for snap sizes
+ * @param imageWidth
+ * the actual image width
+ * @param imageHeight
+ * the actual image height
+ * @param zoom
+ * the zoom factor, or -1 for snap size
+ * @param zoomSnapWidth
+ * if snap size, TRUE to snap to width (and FALSE, snap to
+ * height)
+ *
+ * @return the scaled size, width is [0] and height is [1] (minimum is 1x1)
+ */
+ protected static Integer[] scaleSize(int areaWidth, int areaHeight,
+ int imageWidth, int imageHeight, double zoom, boolean zoomSnapWidth) {
+ int width;
+ int height;
+ if (zoom > 0) {
+ width = (int) Math.round(imageWidth * zoom);
+ height = (int) Math.round(imageHeight * zoom);
+ } else {
+ if (zoomSnapWidth) {
+ width = areaWidth;
+ height = (int) Math.round(
+ (((double) areaWidth) / imageWidth) * imageHeight);
+ } else {
+ height = areaHeight;
+ width = (int) Math.round(
+ (((double) areaHeight) / imageHeight) * imageWidth);
+
+ }
+ }
+
+ if (width < 1)
+ width = 1;
+ if (height < 1)
+ height = 1;
+
+ return new Integer[] { width, height };
+ }
+
/**
* Return the EXIF transformation flag of this image if any.
*