Ray Casting and P2 for semi-realistic bullet speeds.

[ooadup]

Hello,

 

I'm trying to implement ray casting in a top down shooter to have almost very fast bullet speeds. After searching the the forum, I found this example but it has left me with some questions. Is there any way to determine if a Line intersects with a sprite or do I need create lines around each object that can be shot by the player or by enemies?

 

My other idea for a solution to this problem is to loop through each point on ray and determine if there are any sprites at that location. Is there a method that is equivalent to getSpriteAt(x,y) or something like that?

 

Thanks in advance.  

[lewster32]

This topic covers (if not fully gets to a solid answer) the same problem: http://www.html5gamedevs.com/topic/7715-raycasting-help/?hl=cast

 

It's really open to how you want to do it, but there's no single in-built solution in Phaser for this kind of functionality outside of the TileMap stuff.

[ooadup]

Do you think p2.hittest() would work?

 

Edit for clarity.

 

When I say that I mean, if i did something along the lines of 

 

(pseudo code)

for (length of line){   var bodies = p2.hittest(linepoint);   var wallCollision = false;   for (length of bodies){      if (bodies[i].sprite === 'enemy'){         do something      }      if(bodies[i].sprite === 'wall'){         wallcollision = true;         break;      }   }   if (wallCollision){      break;   }}

Edited July 27, 2014 by ooadup

[lewster32]

I've no idea, I'm not totally familiar with P2. It does have a line shape which you can test for overlap, so maybe you can use that as a makeshift ray?