java affine transformations

[Jeremy Watts]

hi,

how would you use the built in java 'affine transformations' found
here :-
http://java.sun.com/j2se/1.4.2/docs/api/java/awt/geom/AffineTransform.html#rotate(double)

for example, lets say i needed to shear the point (2,3), how would i
use
these commands to accomplish this?

thanks
jeremy watts

 

[Roedy Green]

how would you use the built in java 'affine transformations' found

for background, see http://mindprod.com/jgloss/affinetransform.html

 

[Jeremy Watts]

hi Roedy,

tried some of the code on your site, this snippet:-

"import java.awt.geom.AffineTransform;
....

// transform that shifts points 10 right and 20 up
AffineTransform transformer = AffineTransform.getTranslateInstance
( 10.0d, -20.0d );

// create point
Point2D before = new Point2D.Double( 3.0d , 6.0d );

// create point to hold result
Point2D after = new Point2D.Double();

// transform the point
after = transformer.transform ( before, after );

// prints 13.0,-14.0
System.out.println( after.getX() + "," + after.getY() );"



but it seems to throw an error for the line :-
"// create point
Point2D before = new Point2D.Double( 3.0d , 6.0d );"

it says 'cannot find symbol - class Point2D' . whats going on here?

jeremy