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Problem with aspect ratio on brushes

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Problem with aspect ratio on brushes Michael Grosberg 07 Feb 07:58
  Problem with aspect ratio on brushes Alexia Death 07 Feb 12:03
   Problem with aspect ratio on brushes Rob Antonishen 07 Feb 14:06
Michael Grosberg
2011-02-07 07:58:54 UTC (almost 14 years ago)

Problem with aspect ratio on brushes

Something I noticed in Gimp 2.7.3 (updated recently from matthaeus123/mrw-gimp-svn).

The problem is with selecting a non-uniform aspect ratio for brushes: if you set it to something too high, you begin to see spacing between the brush's strokes on the canvas, so instead of a continuous line you see a dotted line when you try to draw a line in the direction of the brush's shorter axis.

I think the spacing calculation does not take into effect the aspect ratio correctly, and acts as if the longest axis is the base length from which spacing is derived, while it should be, I believe, the short axis that affects the spacing.

Also, The aspect ratio slider is not very intuitive - would it be possible to have 0 as the default state (height = width), with, say negative numbers for scaling height and positive for scaling width? I know it makes no sense mathematically, but visually it would help to have the slider centered for zero distortion and have the same length on either side for changing the aspect ratio.

Alexia Death
2011-02-07 12:03:27 UTC (almost 14 years ago)

Problem with aspect ratio on brushes

On Mon, Feb 7, 2011 at 9:58 AM, Michael Grosberg wrote:

I think the spacing calculation does not take into effect the aspect ratio correctly, and acts as if the longest axis is the base length from which spacing is derived, while it should be, I believe, the short axis that affects the spacing.

this is a long standing issue, that I do plan to look into at some point. There are some complications I believe, relating to knowing the effect that dynamics are going to have on shape and size of the brush. The same issue manifests with rotation.

Also, The aspect ratio slider is not very intuitive - would it be possible to have 0 as the default state (height = width), with, say negative numbers for scaling height and positive for scaling width? I know it makes no sense mathematically, but visually it would help to have the slider centered for zero distortion and have the same length on either side for changing the aspect ratio.

This change is already commited to git. Has been for a week or so, the repository must be be behind a bit.

Rob Antonishen
2011-02-07 14:06:12 UTC (almost 14 years ago)

Problem with aspect ratio on brushes

wrote:

I think the spacing calculation does not take into effect the aspect ratio correctly, and acts as if the longest axis is the base length from which spacing is derived, while it should be, I believe, the short axis that affects the spacing.

this is a long standing issue, that I do plan to look into at some point. There are some complications I believe, relating to knowing the effect that dynamics are going to have on shape and size of the brush. The same issue manifests with rotation.

I mentioned in IRC that along with this exposing the brush spacing in the tool parameters along with the other attributes (scaling, rotation, aspect ratio) rather than in the brush panel, would be useful.

-Rob A>