-----Original Message-----
From: Ted Hill
Sent: Thursday, June 09, 2005 11:38 AM
To: 'Alexey Ushakov'
Subject: RE: [JAVA2D] AffineTransform question
Hi Alexey,
The value that I am looking for is the double value to pass to
AffineTransform scaleAtx = AffineTransform.getScaleInstance(double,
double)
So that when scaleAtx is preconcatenated with myCurrentTransform, we can
precisely control the resulting value
from passing myCurrentTransform to this method:
public static double getScaleYElement(final AffineTransform atx)
{
double scaleYElement = 0;
final double scaleY = atx.getScaleY();
final double shearY = atx.getShearY();
scaleYElement = Math.sqrt(Math.pow(scaleY, 2) + Math.pow(shearY,
2));
return scaleYElement;
}
-----Original Message-----
From: Discussion list for Java 2D API
[mailto:[EMAIL PROTECTED] On Behalf Of Alexey Ushakov
Sent: Thursday, June 09, 2005 10:56 AM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA2D] AffineTransform question
Hello Ted,
Applying scaling means simply multiplication diagonal coefficients of
the transform matrix to the specified scaling values.
> So my logic should be like this
>
> if(currentScaleY < SCALE_MAX)
> {
> AffineTransform tempAtx = new
AffineTransform(currentTransform);
> tempAtx.preConcatenate(scaleIncrementAtx);
>
> if(getScaleYElement(getScaleYElement(tempAtx)) < SCALE_MAX)
> {
> currentTransform.preConcatenate(scaleIncrementAtx);
> }
> else // calc the increment that will result in max scale
> value
> {
> // ?? how to calc zoomIncrement in this case ??
> zoomIncrement = ??
So, if I understood your task correctly zoomIncrement should be
SCALE_MAX/currentScaleY.
>
> AffineTransform adjustedIncrementAtx =
> AffineTransform.getScaleInstance(zoomIncrement, zoomIncrement);
>
> currentTransform.preConcatenate(adjustedIncrementAtx);
> }
> }
BTW, you could use following check
currentScaleY + scaleIncrementAtx < SCALE_MAX/currentScaleY
instead of
> if(getScaleYElement(getScaleYElement(tempAtx)) < SCALE_MAX)
> {
Best Regards,
Alexey
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