From Compsci.ca Wiki
Also spelled whatdotcolour (Canadian spelling of colour), it is a Turing function which returns the colour of a specific pixel. Often used for collision detection, it is an easy solution when creating something using Turing graphics alone without external images being involved.
It's actually so important that there's a whatdotcolor Warrior mod.
Here's a quick example of a few basic graphics functions which uses whatdotcolour to check if the mouse is above a red circle.
%%Created By: Gandalf %%Example of whatdotcolour collision detection setscreen ("graphics,offscreenonly") var cx, cy, mx, my, mb : int cx := maxx div 2 cy := maxy div 2 var circleColour : int := red loop cls Draw.FillOval (cx, cy, 40, 40, circleColour) Mouse.Where (mx, my, mb) if whatdotcolour (mx, my) = circleColour and mb > 0 then cx := mx cy := my end if View.Update end loop
An alternative of whatdotcolour collision detection in Turing is using Math.Distance.