[Pharo-users] Updating a Form after changing pixel values

[Mikael Svane]

I have a Form where I change pixel colours using Form>>pixelValueAt:put:.
The Form exists inside an SpImagePresenter. After having changed the pixels,
I want to redraw the Form in an #updatePresenters method to show the
changes, but I haven't been able to figure out how to do this. If I inspect
the Form it is clear that the pixels have been changed, so the problem is in
the #updatePresenters mwthod. I have tried different variations on this
theme without success:

 

updatePresenter 

                           | canvas |

                           "Get the canvas of the Form:"

                           canvas := imagePresenter image form getCanvas.

                           

                           adapter widget drawSubmorphsOn: canvas

 

Any suggestions would be very welcome.

 

Kind regards,

Mikael