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From Mark Gargan <mark.gar...@aviva.com>
Subject AffineTransform
Date Thu, 06 Dec 2018 16:55:16 GMT
Hi folks,

            I'm trying to work with the Affine transform to superimpose a snapshot of an A4
document into an SRA3 document which has crop lines.

The SRA3 template size is or  (8.86in x 12.6in) in inches. The original A4 document I'm taking
the snapshot of is typical A4 ( 8.27in × 11.69in).

I've taken a snapshot of the first page of the A4 original document and it produces an image
in typical A4 size 2480 X 3508 pixels.

I'm trying to figure out the AffineTransform that will place the A4 snapshot into the centre
of the SRA3 document and within the croplines.

So far I have

AffineTransform at = new AffineTransform(700, 0, 0, 700, 100, 200);

with the Affine constructor as follows


*
* @param m00 the X coordinate scaling element of the 3x3 matrix
* @param m10 the Y coordinate shearing element of the 3x3 matrix
* @param m01 the X coordinate shearing element of the 3x3 matrix
* @param m11 the Y coordinate scaling element of the 3x3 matrix
* @param m02 the X coordinate translation element of the 3x3 matrix
* @param m12 the Y coordinate translation element of the 3x3 matrix
* @since 1.2
*/
@ConstructorProperties({ "scaleX", "shearY", "shearX", "scaleY", "translateX", "translateY"
})
public AffineTransform(float m00, float m10,
                       float m01, float m11,
                       float m02, float m12) {

I.e. x-scaling, y-shearing, x-shearing, y-scaling, x-translation, y-translation

I guess the questions are


  1.  Why the signature was presented like this, it's quite unintuitive to place two shearing
factors between two scaling.
  2.  Also I can't understand why the x & y scaling factors need to be in the hundreds.
i.e. 700 and 700
  3.  The translation factors, are they taken from the top right of the image/object being
imported or from the centre?

Thanks in advance for any help folks,
Mark.




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