I want to create a 2D game with a tile based map. My main problem is collision. If there is a tree in my way, how will I make my sprite not move through the tree?
Pseudo-code:
some_event() {
if (bullet.x == monster.x && bullet.y == monster.y) {
collision_occurs();
}
}
Of course the semantics such as which event will be fired and whether or not an event handler makes more sense (i.e.: collision_occurs() when the x and y coordinates meet, rather than if they meet while some_event() is fired) depend on the game.
If you were to analyze this more you would notice that the bullet and monster aren't 1 pixel each, so it would look more like:
// While approaching from the left
if ((bullet.x + (bullet.radius)) >= (monster.x + (monster.radius)))
These fine details come after. Essentially you have moving objects and these objects share coordinates. When these coordinates, as properties of their representational objects, are near enough, a "collision" occurs and some methodology follows.
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