mirror of
https://github.com/photonstorm/phaser
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79 lines
2.2 KiB
JavaScript
79 lines
2.2 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2020 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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/**
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* [description]
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*
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* @function Phaser.Physics.Impact.SeparateY
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* @since 3.0.0
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*
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* @param {Phaser.Physics.Impact.World} world - [description]
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* @param {Phaser.Physics.Impact.Body} top - [description]
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* @param {Phaser.Physics.Impact.Body} bottom - [description]
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* @param {Phaser.Physics.Impact.Body} [weak] - [description]
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*/
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var SeparateY = function (world, top, bottom, weak)
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{
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var nudge = (top.pos.y + top.size.y - bottom.pos.y);
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var nudgeX;
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var resTop;
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if (weak)
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{
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var strong = (top === weak) ? bottom : top;
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weak.vel.y = -weak.vel.y * weak.bounciness + strong.vel.y;
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// Riding on a platform?
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nudgeX = 0;
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if (weak === top && Math.abs(weak.vel.y - strong.vel.y) < weak.minBounceVelocity)
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{
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weak.standing = true;
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nudgeX = strong.vel.x * world.delta;
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}
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var resWeak = world.collisionMap.trace(weak.pos.x, weak.pos.y, nudgeX, weak === top ? -nudge : nudge, weak.size.x, weak.size.y);
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weak.pos.y = resWeak.pos.y;
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weak.pos.x = resWeak.pos.x;
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}
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else if (world.gravity && (bottom.standing || top.vel.y > 0))
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{
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resTop = world.collisionMap.trace(top.pos.x, top.pos.y, 0, -(top.pos.y + top.size.y - bottom.pos.y), top.size.x, top.size.y);
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top.pos.y = resTop.pos.y;
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if (top.bounciness > 0 && top.vel.y > top.minBounceVelocity)
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{
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top.vel.y *= -top.bounciness;
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}
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else
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{
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top.standing = true;
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top.vel.y = 0;
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}
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}
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else
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{
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var v2 = (top.vel.y - bottom.vel.y) / 2;
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top.vel.y = -v2;
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bottom.vel.y = v2;
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nudgeX = bottom.vel.x * world.delta;
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resTop = world.collisionMap.trace(top.pos.x, top.pos.y, nudgeX, -nudge / 2, top.size.x, top.size.y);
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top.pos.y = resTop.pos.y;
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var resBottom = world.collisionMap.trace(bottom.pos.x, bottom.pos.y, 0, nudge / 2, bottom.size.x, bottom.size.y);
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bottom.pos.y = resBottom.pos.y;
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}
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};
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module.exports = SeparateY;
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