coordinate transformation

[jayhg99]

What is the correct method to calculate each pixel’s coordinate translation after an image is zoomed around center ?   I’m using the following steps to zoom an image around it’s center :

AffineTransform atT=new AffineTransform();

int dx=img.getWidth()/2;
int dy=img.getHeight()/2;

atT.preConcatenate(AffineTransform.getTranslateInstance(-dx, -dy));

atT.preConcatenate(AffineTransform.getScaleInstance(scale, scale));

atT.preConcatenate(AffineTransform.getTranslateInstance(dx, dy));

g.drawImage(img,atT, this);

How can find out each pixel’s coordinate translation after zooming ?


Thanks,

Jay

[Abuse]

To calculate the new coords of every point in the image :-

1   2   3   4   5   6   7   8   9   10   11

int imgWidth = img.getWidth(), imgHeight = img.getHeight(); double [] points = new double[imgWidth*imgHeight*2]; for(int i = 0;i< points.length;i+=2) {    points[i] = (i/2)%imgWidth;    points[i+1] = (i/2)/imgWidth; } atT.transform(points,0,points,0,points.length/2);

If you just want a few points, use afT.transform(Point2D src, Point2D dst)