# Collide() function

I make a game - I started to make a game and I used collide(Rect,Rect); to detect if the player is hitting a block, but I can’t get away once i hit it. That my codes fault but I don’t know how to solve this… Thank you for your help?!

``````constexpr uint8_t playerWidth = 16, playerHeight = 16;
constexpr uint8_t blockWidth = 16, blockHeight = 16;

while (win != 1) {
ab.clear();
ab.drawBitmap(0, 0, MAP1, 128, 64, WHITE);
ab.drawBitmap(x, y, player, 16, 16, WHITE);
ab.display();
Rect player = Rect(x, y, playerWidth, playerHeight);
Rect block = Rect(48, 32, playerWidth, playerHeight);

if (!ab.collide(player, block)) {
if (ab.pressed(LEFT_BUTTON) && x > 0)
x--;
else if (ab.pressed(RIGHT_BUTTON) && x < 112)
x++;
else if (ab.pressed(UP_BUTTON) && y > 0)
y--;
else if (ab.pressed(DOWN_BUTTON) && y < 48)
y++;
}
}
``````

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I’ve done this for you in your post but please do it yourself in the future.

Once your player collides with the block,
`if (!ab.collide(player, block))`
will never be `true`, so the code to test for the buttons being pressed will never be executed.

This should be:
`Rect block = Rect(48, 32, blockWidth, blockHeight);`

It’s not a problem right now because the player and block widths and heights are the same but it will be if the sizes become different.

Thanks, I saw many people using it, but I didn’t knew how.

I know that so far, but how can I make it not doing so?

You’ll have to change the `x` or `y` variable so that the player is no longer colliding with the block. How you do this will depend on what’s supposed to happen when you collide. For instance, this will move the player back to the top left of the screen if it collides:

``````  if (!ab.collide(player, block)) {
if (ab.pressed(LEFT_BUTTON) && x > 0)
x--;
else if (ab.pressed(RIGHT_BUTTON) && x < 112)
x++;
else if (ab.pressed(UP_BUTTON) && y > 0)
y--;
else if (ab.pressed(DOWN_BUTTON) && y < 48)
y++;
}
else
{
x = 0;
y = 0;
}
``````

Ohhh, yes thats easy to make, of course I dindn’t thought of that before.
Thank you!

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