P2.Body addPolygon mutates points in point array

[Plukers]

• A bug in the API:
  • Phaser version(s): 2.8.3
  • What should happen: The coordinates in the point array should not change
  • What happens instead: The values are modified
  • Live example:

const s = game.add.sprite(x, y, 'Sprite');
game.physics.p2.enable(s, false);
s.body.clearShapes();

const points = [[10, 20], [30, 40], [50, 60]];
console.log(points.toString()); // 10,20,30,40,50,60
s.body.addPolygon({}, points);
console.log(points.toString()); // -0.5,-1,-1.5,-2,-2.5,-3

I had no chance to take a closer look, but it looks like the mutation happens here physics/p2/Body.js, line 1180

[samme]

I don't think it's a bug, but it may be undesirable. We can add a note to the docs.

Can you try passing a flat array? [10, 20, 30, 40, 50, 60]

[Plukers]

I wrote bug because it was the most fitting option, but you are right, it's not a bug, just unexpected.
So a note in the docs would be great, thank you!

I will try it with the flat array tomorrow at work and post the results.

[samme]

Understood, thanks.

[Plukers]

It works with the flat array, the array is not changed.