90 lines
2.1 KiB
JavaScript
90 lines
2.1 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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* Set up the trace-result
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* var res = {
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* collision: {x: false, y: false, slope: false},
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* pos: {x: x, y: y},
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* tile: {x: 0, y: 0}
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* };
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*
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* @function Phaser.Physics.Impact.UpdateMotion
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* @since 3.0.0
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*
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* @param {Phaser.Physics.Impact.Body} body - [description]
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* @param {object} res - [description]
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*/
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var UpdateMotion = function (body, res)
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{
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body.standing = false;
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// Y
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if (res.collision.y)
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{
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if (body.bounciness > 0 && Math.abs(body.vel.y) > body.minBounceVelocity)
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{
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body.vel.y *= -body.bounciness;
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}
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else
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{
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if (body.vel.y > 0)
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{
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body.standing = true;
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}
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body.vel.y = 0;
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}
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}
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// X
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if (res.collision.x)
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{
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if (body.bounciness > 0 && Math.abs(body.vel.x) > body.minBounceVelocity)
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{
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body.vel.x *= -body.bounciness;
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}
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else
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{
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body.vel.x = 0;
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}
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}
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// SLOPE
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if (res.collision.slope)
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{
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var s = res.collision.slope;
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if (body.bounciness > 0)
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{
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var proj = body.vel.x * s.nx + body.vel.y * s.ny;
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body.vel.x = (body.vel.x - s.nx * proj * 2) * body.bounciness;
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body.vel.y = (body.vel.y - s.ny * proj * 2) * body.bounciness;
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}
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else
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{
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var lengthSquared = s.x * s.x + s.y * s.y;
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var dot = (body.vel.x * s.x + body.vel.y * s.y) / lengthSquared;
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body.vel.x = s.x * dot;
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body.vel.y = s.y * dot;
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var angle = Math.atan2(s.x, s.y);
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if (angle > body.slopeStanding.min && angle < body.slopeStanding.max)
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{
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body.standing = true;
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}
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}
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}
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body.pos.x = res.pos.x;
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body.pos.y = res.pos.y;
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};
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module.exports = UpdateMotion;
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