You can get the bitmap from the clipboard using "(send the-clipboard 
get-clipboard-bitmap)" and you can use the bitmap dimensions (see get-with 
and get-height methods of the bitmap% object) to make the canvas the same 
size as the bitmap by constructing it with stretchable-width and 
stretchable-height set to #f and setting the min-width and min-height to 
the bitmap dimensions.   To draw the bitmap onto the canvas, you can use 
the draw-bitmap method in the paint callback.

For the mouse clicks, you will need to override the `on-subwindow-event` on 
the canvas to look at the mouse events and record where the user clicked.  
You can draw the letters at the click positions in the paint-callback of 
the canvas using the draw-text method.

Hope this helps,

On Saturday, June 27, 2020 at 10:44:44 AM UTC+8 frangonve wrote:

> Hello, A newbie here:
> I want to insert an image from windows clipboard to a rectangular widget 
> that will take the image size. Then when  repeatedly clicking the mouse on 
> different coordinates of the image I want to superimpose each time the next 
> letter in alphabetic order with transparent background:
> This is the type of images to insert:
> [image: Clever Mines 20200318.png]
> This is what I want to show after clicking several times on the image 
> high-left corner:
> [image: Clever Mines 20200318 id.png]
> Please can you help me?
> Cheers
> Francisco 

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