Data Transformations

The Gerber Union user may need to apply certain transformations to the data during union process. Gerber Union supports the following transformations which are available in the Advanced menu:

    Mirror

    it is possible to mirror in X, Y or both directions simultaneously. This transform is applied before any other.

    Scale

    it is possible to scale X and Y independently. Scaling is applied after mirroring but before rotation.

    Rotate

    it is possible to rotate the data in any increment. This is the last vector transformation.

    Polarity Reversal

    it is possible to reverse the polarity of the gerber file.


Examples - Transformation and Images

We will illustrate the behavior of the transforms using a simple Gerber file as shown below:


Case 1: No Transformation

bitmap: no mirror, scale 1, rotation 0 		 

bitmap: no mirror, scale 1, rotation 0


Case 2: Polarity Inversion

   bitmap: no mirror, scale 1, rotation 0 invert data


Case 3: Mirror in X Direction

Notes:

mirror along X means mirror in the X direction; not mirror along the X-axis. Same for mirror in Y.

   bitmap: mirror along x, scale 2, rotation 0


Case 4: Mirror in Y Direction

   bitmap: mirror along x, scale 2, rotation 0


Case 5:
Mirror in X and Rotate 90 Degrees

  

bitmap: mirror along x, scale 2, rotation 90 deg


Notes

Mirroring is performed before rotation. Rotation is CCW




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