You can reduce the number of calculations you are doing a bit.
final int halfWidth = bufImage.getWidth( ) / 2;
final int halfHeight = bufImage.getHeight( ) / 2;
float translateX = halfWidth - halfWidth / zoomFactor;
float translateY = halfHeight - halfHeight / zoomFactor;
g2.translate( -translateX, -translateY );
At 09:11 AM 8/30/00 -0500, Ted Hill wrote:
>I posted a question yesterday on scaling and translating, I think I have
>found my answer.
>
>I don't understand all the details, but it looks like after calling the
>scale( ), the translate( ) call must also be scaled:
>
> protected void paintComponent(Graphics g)
> {
> super.paintComponent(g);
>
> Graphics2D g2 = (Graphics2D) g;
>
> final int width = bufImage.getWidth( );
> final int height = bufImage.getHeight( );
> final float zoomFactor = getZoomFactor( );
>
> // translate by half the 'growth'
> float translateX = 0.5f * ((width * zoomFactor) - width);
> float translateY = 0.5f * ((height * zoomFactor) - height);
>
> // make image larger
> g2.scale(zoomFactor, zoomFactor);
>
> // keep image center centered
> g2.translate( - (translateX * (1/zoomFactor)), - (translateY *
> (1/zoomFactor)) );
>
> g2.drawImage(bufImage, 0, 0, this);
> }
>
>In the above code, I multiply my translateX and translateY by the inverse
>of the zoomFactor which was used to do the scaling. Now as the image gets
>bigger, it stays centered.
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