51 lines
1.2 KiB
JavaScript
51 lines
1.2 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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var Clamp = require('../../math/Clamp');
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/**
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* [description]
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*
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* @function Phaser.Physics.Impact.GetVelocity
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* @since 3.0.0
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*
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* @param {number} delta - The delta time in ms since the last frame. This is a smoothed and capped value based on the FPS rate.
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* @param {number} vel - [description]
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* @param {number} accel - [description]
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* @param {number} friction - [description]
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* @param {number} max - [description]
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*
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* @return {number} [description]
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*/
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var GetVelocity = function (delta, vel, accel, friction, max)
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{
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if (accel)
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{
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return Clamp(vel + accel * delta, -max, max);
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}
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else if (friction)
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{
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var frictionDelta = friction * delta;
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if (vel - frictionDelta > 0)
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{
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return vel - frictionDelta;
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}
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else if (vel + frictionDelta < 0)
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{
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return vel + frictionDelta;
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}
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else
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{
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return 0;
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}
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}
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return Clamp(vel, -max, max);
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};
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module.exports = GetVelocity;
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