On most cards, simply choosing a drawing tool, the pencil for example, an image is created by the act of drawing. The dimensions of the image fills the window.

Or the act of dragging with a drawing tool in a handler has this same effect of creating its own drawing space. If I open a new blank stack and run the following handler:

on mouseUP
  choose the pencil tool
  drag from 100,100 to 300,300
  choose the browse tool
end mouseUp

This gives me a line, as expected.

But if I first import an image (a jpg for example) and run the above handler, nothing.

What is there about an existing  image that causes this behavior?

(I can recover the ability to drag and draw by first creating a blank image, setting its rect to the screenRect and then running the above handler. I guess what surprises me is that Run Rev loses its forgiving behavior of creating an image to draw into if there is an existing image already present.)


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