mirror of
https://github.com/photonstorm/phaser
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81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2018 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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var GetOverlapX = require('./GetOverlapX');
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/**
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* [description]
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*
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* @function Phaser.Physics.Arcade.SeparateX
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* @since 3.0.0
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*
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* @param {Phaser.Physics.Arcade.Body} body1 - [description]
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* @param {Phaser.Physics.Arcade.Body} body2 - [description]
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* @param {boolean} overlapOnly - [description]
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* @param {number} bias - [description]
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*
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* @return {boolean} [description]
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*/
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var SeparateX = function (body1, body2, overlapOnly, bias)
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{
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var overlap = GetOverlapX(body1, body2, overlapOnly, bias);
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// Can't separate two immovable bodies, or a body with its own custom separation logic
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if (overlapOnly || overlap === 0 || (body1.immovable && body2.immovable) || body1.customSeparateX || body2.customSeparateX)
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{
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// return true if there was some overlap, otherwise false
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return (overlap !== 0) || (body1.embedded && body2.embedded);
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}
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// Adjust their positions and velocities accordingly (if there was any overlap)
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var v1 = body1.velocity.x;
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var v2 = body2.velocity.x;
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if (!body1.immovable && !body2.immovable)
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{
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overlap *= 0.5;
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body1.x -= overlap;
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body2.x += overlap;
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var nv1 = Math.sqrt((v2 * v2 * body2.mass) / body1.mass) * ((v2 > 0) ? 1 : -1);
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var nv2 = Math.sqrt((v1 * v1 * body1.mass) / body2.mass) * ((v1 > 0) ? 1 : -1);
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var avg = (nv1 + nv2) * 0.5;
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nv1 -= avg;
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nv2 -= avg;
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body1.velocity.x = avg + nv1 * body1.bounce.x;
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body2.velocity.x = avg + nv2 * body2.bounce.x;
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}
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else if (!body1.immovable)
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{
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body1.x -= overlap;
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body1.velocity.x = v2 - v1 * body1.bounce.x;
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// This is special case code that handles things like vertically moving platforms you can ride
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if (body2.moves)
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{
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body1.y += (body2.y - body2.prev.y) * body2.friction.y;
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}
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}
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else
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{
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body2.x += overlap;
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body2.velocity.x = v1 - v2 * body2.bounce.x;
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// This is special case code that handles things like vertically moving platforms you can ride
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if (body1.moves)
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{
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body2.y += (body1.y - body1.prev.y) * body1.friction.y;
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}
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}
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// If we got this far then there WAS overlap, and separation is complete, so return true
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return true;
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};
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module.exports = SeparateX;
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