//package com.myapp.util.image;
import java.awt.Dimension;
public class ImageUtil {
/**
* returns a dimension where width and height are inside the bounds of the
* maxWidth and maxHeight parameters<br>
* and the aspect ratio is the same as sourceWidth and sourceHeight.
*
* @param maxWidth
* the maximum width of the target dimension
* @param maxHeight
* the maximum height of the target dimension
* @param sourceWidth
* the widht of the source image
* @param sourceHeight
* the height of the source image
* @return the target dimension that will be the greatest dimension that
* <ul>
* <li>will keep the ratio of the source images dimension</li>
* <li>fits in the bounds of the maximum dimension given</li>
* </ul>
*/
public static Dimension scaleDimensions(int maxWidth,
int maxHeight,
int sourceWidth,
int sourceHeight) {
float vidH, vidW, maxH, maxW;
vidW = Integer.valueOf(sourceWidth).floatValue();
vidH = Integer.valueOf(sourceHeight).floatValue();
maxW = Integer.valueOf(maxWidth).floatValue();
maxH = Integer.valueOf(maxHeight).floatValue();
// System.out.println("initial height / width ratio: " + vidH / vidW);
// System.out.println();
// System.out.println("vidW "+vidW+", vidH "+vidH);
// System.out.println("maxW "+maxW+", maxH "+maxH);
// System.out.println();
float finalW, finalH;
finalH = vidH / vidW * maxW;
finalW = maxW;
if (finalH > maxH) {
float factor = maxH / finalH;
finalH = maxH;
finalW = finalW * factor;
}
int w = Float.valueOf(finalW).intValue();
int h = Float.valueOf(finalH).intValue();
Dimension d = new Dimension(w,h);
// System.out.println();
// System.out.println("finalW "+finalW+", finalH "+finalH);
// System.out.println("final height / width ratio: " + finalH / finalW);
// System.out.println();
// System.out.println(d);
return d;
}
// test scaleDimensions
public static void main(String[] args) {
int maxWidth = 250;
int maxHeight = 200;
int videoWidth = 320;
int videoHeight = 240;
Dimension d = scaleDimensions(maxWidth,
maxHeight,
videoWidth,
videoHeight);
System.out.println(d);
}
}
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