SOLVED Collision detection notworking

Tue, 20 Sep 2022 19:08:06 UTC

Hi I'm currently working on my first project in pico-8 and I loosely followed a tutorial on collision detection and I wrote this function

function colliderect(x1,y1,w1,h1,x2,y2,w2,h2)
    xs = w1/2 + w2/2
    ys = h1/2 + h2/2
    xd = sqrt((x1)^2+(x2)^2)
    yd = sqrt((y1)^2+(y2)^2)
    if ((xs > xd and ys > yd)) then
        return false //colliding
    else
        return true //not colliding
    end
end

which takes the x and y coordinates and the width and height of two objects and calculates if they collide. The function itself seems to work as it should and gives the correct result when manually inputting the data but when I implement it like this

function update_player()
    for i in all(bullets) do
        if (not colliderect(player.x,player.y,player.w,player.h,i.x,i.y,i.w,i.h)) then
            sfx(1)  
        end
    end         
end

it doesn't work anymore. Even if I am standing right on the bullet it doesn't play the sound it should when colliding (and yes I did check if it's the right SFX). I am also not getting any errors when running the program so I don't really know what's wrong. Any help would be very much appreciated.

Figured out what's wrong already I had a small mistake when calculating xd and yd that is I forgot to add the width and height to them when calculating them. This is how it should have been.

xd = abs((x1+(w1/2))-(x2+(w2/2))) //also learned that an abs function exists for pico
yd = abs((y1+(h1/2))-(y2+(h2/2)))

Ben0981 [Lexaloffle Blog Feed]

SOLVED Collision detection notworking