X-Git-Url: http://git.nikiroo.be/?p=nikiroo-utils.git;a=blobdiff_plain;f=ImageUtils.java;h=877c8fa8c26b6b8a1a585505cf70f4a37d3d4fc7;hp=fb869294f2029bd1c0fd7f4a64680259ca4bc4b0;hb=ac351f5c0d4097afc3de3b8f9f3e291d07a54678;hpb=2d1ca40b5659f3f05d8f82973d923d3b8089a7c7

diff --git a/ImageUtils.java b/ImageUtils.java
index fb86929..877c8fa 100644
--- a/ImageUtils.java
+++ b/ImageUtils.java
@@ -41,6 +41,52 @@ public abstract class ImageUtils {
 	public abstract void saveAsImage(Image img, File target, String format)
 			throws IOException;
 
+	/**
+	 * Scale a dimension.
+	 * 
+	 * 
+	 * @param imageWidth
+	 *            the actual image width
+	 * @param imageHeight
+	 *            the actual image height
+	 * @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 zoom
+	 *            the zoom factor (ignored on snap mode)
+	 * @param snapMode
+	 *            NULL for no snap mode, TRUE to snap to width and FALSE for
+	 *            snap to height)
+	 * 
+	 * @return the scaled size, width is [0] and height is [1] (minimum is 1x1)
+	 */
+	protected static Integer[] scaleSize(int imageWidth, int imageHeight,
+			int areaWidth, int areaHeight, double zoom, Boolean snapMode) {
+		int width;
+		int height;
+		if (snapMode == null) {
+			width = (int) Math.round(imageWidth * zoom);
+			height = (int) Math.round(imageHeight * zoom);
+		} else if (snapMode) {
+			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.
 	 *