How to check if on Floor using P2?

[swissnetizen]

Hey,

So I need to check whether a sprite is on the floor using P2 physics. Basically something like Arcade.onFloor() but for P2 physics.

[megmut]

There is an example in the phaser p2 examples section, see here for more : http://phaser.io/examples/v2/p2-physics/collision-groups

[swissnetizen]

I don't think you understood. I want to check if it's on a floor outside of an event handler. The example uses event handler with collision groups that's not what I want to do

[swissnetizen]

For future reference, this is how to detect if the entity is on the floor (I think):

var checkIfCanJump = function() {
  var c, d, i, result, yAxis;
  yAxis = p2.vec2.fromValues(0, 1);
  result = false;
  i = 0;
  while (i < game.physics.p2.world.narrowphase.contactEquations.length) {
    c = game.physics.p2.world.narrowphase.contactEquations[i];
    if (c.bodyA === player.body.data || c.bodyB === player.body.data) {
      d = p2.vec2.dot(c.normalA, yAxis);
      if (c.bodyA === player.body.data) {
        d *= -1;
      }
      if (d > 0.5) {
        result = true;
      }
    }
    i++;
  }
  return result;
};

from: http://phaser.io/examples/v2/p2-physics/tilemap-gravity