Hi there.
Try this:
Your calculation was returning 0 because you were trying to do float division with integers.
Someone else can probably explain this better than me, but if you are calculating a float, you need to use floats in your division.
Which is why the code above has 578.0 instead of 578.
[EDIT] Rob - your post appeared literally 8 seconds before mine.
Try this:
Open in online IDEGraphics 640,480,32,2 yScreen=768 Global radydistance=(yScreen * (578.0/768)) Print radydistance WaitKey()
Your calculation was returning 0 because you were trying to do float division with integers.
Someone else can probably explain this better than me, but if you are calculating a float, you need to use floats in your division.
Which is why the code above has 578.0 instead of 578.
[EDIT] Rob - your post appeared literally 8 seconds before mine.