Collision Help Please

[StrikerZ]

i am making a game where two circles draw paths and when one of them collide into the other players path, that player loses, but i am having trouble making the collision detection so that it tells you what player won if you hit the other players path. im also having trouble with the boundaries...every time the circles hit the boundaries they get stuck...could someone help please...heres my code

code:

var window : int := Window.Open ("graphics:1000;668") View.Set ("offscreenonly") var chars : array char of boolean var x1, y1 : int var x2, y2 : int x1 := 800 y1 := 668 div 2 x2 := 200 y2 := 668 div 2 loop     Input.KeyDown (chars)     %Player 1     if chars (KEY_UP_ARROW) then         y1 := y1 + 1     end if     if chars (KEY_DOWN_ARROW) then         y1 := y1 - 1     end if     if chars (KEY_LEFT_ARROW) then         x1 := x1 - 1     end if     if chars (KEY_RIGHT_ARROW) then         x1 := x1 + 1     end if     if (x1 + 10) >= maxx or (x1 - 10) <= -1 then         x1 *= -1     elsif (y1 + 10) >= maxy or (y1 - 10) <= -1 then         y1 *= -1     end if     %Player 2     if chars ('w') then         y2 := y2 + 1     end if     if chars ('s') then         y2 := y2 - 1     end if     if chars ('a') then         x2 := x2 - 1     end if     if chars ('d') then         x2 := x2 + 1     end if     if (x2 + 10) >= maxx or (x2 - 10) <= -1 then         x2 *= -1     elsif (y2 + 10) >= maxy or (y2 - 10) <= -1 then         y2 *= -1     end if     Draw.FillOval (x1, y1, 10, 10, brightgreen)     Draw.FillOval (x2, y2, 10, 10, brightblue)     View.Update

[NikG]

StrikerZ wrote:

code:

if (x1 + 10) >= maxx or (x1 - 10) <= -1 then         x1 *= -1     elsif (y1 + 10) >= maxy or (y1 - 10) <= -1 then         y1 *= -1     end if

This will not work because all you are doing is changing the player's x/y positions to negative, so it'll keep changing back and forth. Instead, just set the x/y values to just outside the boundary.

As for collission detection, you haven't even attempted it, so I can't give you the answer. But I will tell you that you will not be able to do it without whatdotcolor if you want the players to lose when they hit the path of the other player.