Help with basic collisions

[Leltoson]

What is the most basic form of writing an if statement to detect a collision?

I have two sprites and I basically want one sprite to be moved along by the other (The other sprite has predefined movement behaviour whilst the other sprite is moved by the arrow keys on the keyboard.

Imagine it like the player jumping onto the roof of an already moving spaceship.

Please let me know if you require any more information from me, I am happy to provide this for my space game.

[Erdrick]

Hi Leltoson,

Here is one way, to see if the boundaries of a sprite contains the corner of another sprite

if (m_sprite.getGlobalBounds().contains(m_sprite2.getPosition()))

[Brax]

Or better, check if boundry of a sprite intersects wtih a boundry od another sprite:

if (aSprite.getGlobalBounds().intersects(aSprite2.getGlobalBounds()))
{
  // apply rest of magic here.
}

[Leltoson]

With intersects it did not work. With contains it did as so:

   if (player.getGlobalBounds().contains(spaceship.getPosition()))
      {
         std::cout << "testing collision" << std::endl;
                        player.move(x=relative to spaceship speed?, 0);
      }

I am now currently struggling with setting it so when the player is on top of the spaceship it is riding it at the same speed? It moves along with the already pre determined / automated / ai movement of the spaceship.

[Erdrick]

Hi just fyi the intersects function should be a better solution than what I proposed. 

Its worth making that work since mine only tests one point

Sent from my SGH-M919 using Tapatalk

[Leltoson]

I got it working actually:

 if (player.getGlobalBounds().intersects(spaceship.getGlobalBounds()))
      {
         std::cout << "testing collision" << std::endl;
                        player.move(x=relative to spaceship speed?, 0);
      }

[Erdrick]

Nice!  Its great to hear when a problem was solved and how.

[Leltoson]

I did not end up using this in my game in the end, but I learnt a lot by trying either how.