creating a bottom that behaves like an eraser please help

[pravea sobolalliv]

[SteveJG]

Could you tells us more about what you want to erase?

Do you want to 'erase' text from a Label or text string?

Do you want to 'erase' lines from a Canvas?

Can you give us an example?

Have you tried some blocks to do what you want to do and if you did, what do the blocks look like?   Please post a png or jpg image of you blocks.

Regards,

Steve

[pravea sobolalliv]

His Steve,
 yes i want to delete lines and dots from the canvas, i will later send you the blocks, iam working on it
thanks

[SteveJG]

To erase all the dots and lines drawn on a Canvas >      call Canvas1.Clear     That command 'erases' everything.

The Canvas control does not have an 'UnDo' function, so there is no way to back up and return to a previous state of the canvas unless you continually save 

'images' of the canvas.  You can however, change the  'painting' color.       set Canvas1.PaintColor to   the background color of the canvas.  The background of the Canvas is initially white I believe.

So, it is possible you can 'erase' by   set Canvas1.PaintColor to   Canvas1.BackgroundColor.  When you are done,  set Canvas1.PaintColor to  whatever you started drawing with.

Does that work?

Regards,

Steve

[pravea sobolalliv]

Iam currently working with the paint pot tutorial, I setted up the camera, share bottom and the image picker so, so whether an image is  taken from the camera or image is imported from the photo's phone gallery once that image is all set it up as a background image, i paint on it  and iam using the call canvas1.clear wich erases everything, but what i want is an eraser that delets drawing parcially from the canvas by dragging my finger on it  and erase just the lines i don't like

Thanks!

[Taifun]

see these threads https://groups.google.com/forum/#!searchin/programming-with-app-inventor/canvas$20undo

Taifun

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