kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxx>]

On 12/19/2017 10:45 PM, Jon Evans wrote:
> I would file a bug report for this.
> 
> There is actually an underlying problem that is going to keep causing
> little things like this to pop up...
> The GAL / tool framework doesn't have a transform matrix applied between
> the user inputs and the world coordinate system.
> 
> When the Flip Board view is active, the world coordinates are flipped at
> the output stage (when being sent to the renderer).
> But, anything that modifies the view in world space (like the scrollbar,
> but also actions like aligning objects to each other, moving them around
> with the cursor, etc) is going to be backwards.
> This is currently solved in the align tool and
> PCBNEW_CONTROL::CursorControl by checking for IsMirroredX and flipping
> the coordinates around in that case.
> 
> A better approach would be to insert some kind of transform matrix for
> actions that are supposed to take place from the perspective of the
> "camera", so that "right" is always "right" and "left" is always "left".
> Not only would this eliminate a whole category of bugs, but it would
> allow for easy addition of additional view options besides "flip board"
> -- some advanced tools have the ability to view the board at arbitrary
> 90-degree rotations as well, which is a great feature.

This certainly would be a cleaner solution to the problem than adding
code to every tool and/or object to check if the board view is flipped.

> 
> (it would even open the door to editing the board in 3D, since you could
> transform coordinates in arbitrary 3D space into the appropriate
> movements in the 2D board world coordinates)

I'm not sure how this would work in practice but it would be a really
cool feature.

> 
> -Jon
> 
> On Tue, Dec 19, 2017 at 10:30 PM, Henner Zeller <h.zeller@xxxxxxx
> <mailto:h.zeller@xxxxxxx>> wrote:
> 
>     Hi,
>     I just tried the 'Flip Board View' feature. Neat - but is it
>     intentional that the horizontal scrollbar now works, uhm, inversed ?
>     It feels very unintuitive ...
> 
>     Cheers,
>      -h
> 
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