如何在Phaser P2 Body中应用"空气"摩擦？

Question

如何在Phaser.P2.body中施加摩擦力？在基于Air-Hockey移相器的游戏中.如何从曲棍球台"关闭气流"？

在这个例子中:http://jsfiddle.net/ywzmkso3/32/

// Initialize Phaser, and creates a 400x490px game
var game = new Phaser.Game(400, 400, Phaser.CANVAS, 'game_div');
var game_state = {};

// Creates a new 'main' state that wil contain the game
game_state.main = function() { };  
game_state.main.prototype = {

preload: function() { 
    // Function called first to load all the assets
},

create: function() { 
    game.physics.startSystem(Phaser.Physics.P2JS);
    game.physics.p2.restitution = 0.7;

    //start drawing a circle
    var graphics = game.add.graphics(0, 0);
    graphics.beginFill(0xFF3300);
    graphics.lineStyle(0);
    graphics.beginFill(0xFFFF0B);
    graphics.drawCircle(100, 100, 40);
    graphics.endFill();
   //creating an sprite from draw
    var spriteCircle = game.add.sprite(100, 300, graphics.generateTexture());
    //  And destroy the original graphics object
    graphics.destroy();
    spriteCircle.anchor.set(0.5);
    game.physics.p2.enable([ spriteCircle ], false);
    spriteCircle.body.setCircle(20);// 20 radius

    spriteCircle.body.mass = 1;
    spriteCircle.body.debug = true;
    //give some initial velocity
    spriteCircle.body.velocity.x = 10000
    spriteCircle.body.velocity.y = 19999



},

update: function() {

},
};

// Add and start the 'main' state to start the game
game.state.add('main', game_state.main);  
game.state.start('main'); 

如果表是打开的话,这是一个非常好的和现实的例子..但是......如果表是关闭的？puc应该移动得更慢,并且应该有更短的停止.我想模仿那个.想象黄色圆圈是空气球冰球,黑色背景是那些充气桌子之一.如何设置puc和桌子之间的摩擦力？

P2文档似乎有许多与碰撞和与身体边缘和材料接触有关的事情......但是如何模拟与"空气"的摩擦？或"水",如果这个身体在游泳..或与冰球和桌子摩擦？

PS.尝试降级更新()中的P2.body.velocity.x和y会促进奇怪的重新路由行为.

Answer 1

您正在寻找Phaser P2的damping属性,它将物质体引入拖拽.

将它添加到您的身体,冰球很快停止,好像空气已经关闭:

spriteCircle.body.damping = 0.9;

阻尼指定速度的比例丢失每个第二,和有效的值的范围是0到1.

用阻尼更新了JSFiddle:http://jsfiddle.net/Lucgmptn/