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Help with collision testing

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here is what I have while( bugy <= mapy ) { bugy += 4; bugx += 4; cout << bugy << "\n"; if (bugx <= mapx) { cout <<bugx<<"\n"; } } now when it does = mapy or mapx I want it to go the other direction tell it = 0 for x and 0 for y then change direction again. How would I accomplish that?

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Here's a simple solution

[source lang='cpp']

float speedX, speedY;
float x, y;
float mapX, mapY; // assume these two variables are right and bottom corners of the map

x = 100; // some value
y = 100;
speedX = 1;
speedY = 1;
mapX = 640; // size of map
mapY = 480;

while(1)
{
x += speedX;
y += speedY;

if(x < 0 || x > mapX) speedX *= -1;
if(y < 0 || y > mapY) speedY *= -1;
}


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