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, Alex. 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 > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/b5ad5b07-ae85-40e6-b072-8c71e5a68dd2n%40googlegroups.com.
