Bootstrap Reactive Unit 5 Displaying the position

[Luis Saltos]

Hi,  I am currently working on Unit 5 from Bootstrap Reactive.  There is an optional assignment to display the position of Sam the Butterfly on the screen.  How do I do this so that I can display both the x and y coordinate of Sam?

Thanks

[Schanzer (Director)]

Hi Luis - thanks so much for writing! As you might imagine, changing what's displayed onscreen is going to require modification to the draw-state function. Specifically, you'll be needing to use put-image to layer another image on top of everything else. This other image is going to be Sam's coordinates.

I'd try the following:

1) Use the text function to make an image of the text "X: 42, Y: 100" (note: the whole thing - including the numbers - is just one big string)

2) Use the text and num-to-string function together to make an image of a string that includes real numbers.

3) Use your solution to #2 inside draw-state, so you see those same (unchanging) numbers when you run the animation

4) Replace those numbers with the fields from a-char

Let us know how it goes - and if you get stuck on one of these, let us know which one!

Emmanuel