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<h1 class="page-title">Source: physics/Velocity.js</h1>
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<pre class="prettyprint source linenums"><code>//------------------------------------------------------------------------------
// Constructor scope
//------------------------------------------------------------------------------
/**
* Creates a new Velocity object.
*
* @constructor
* @extends rune.geom.Vector2D
*
* @param {number} x Velocity in x direction.
* @param {number} y Velocity in y direction.
*
* @class
* @classdesc
*
* The Velocity class represents motion in two dimensions (x and y).
*/
rune.physics.Velocity = function(x, y) {
//--------------------------------------------------------------------------
// Super call
//--------------------------------------------------------------------------
/**
* Extend rune.geom.Vector2D.
*/
rune.geom.Vector2D.call(this, x, y);
//--------------------------------------------------------------------------
// Public properties
//--------------------------------------------------------------------------
/**
* Acceleration acts as gravity; it is a constant force that can affect the
* object in the x and / or y direction. If acceleration is set, the object
* is moved by the force of acceleration for each update.
*
* @type {rune.geom.Vector2D}
* @default new rune.geom.Vector2D(0, 0)
*/
this.acceleration = new rune.geom.Vector2D(0, 0);
/**
* The object's rotation speed, stated in degrees per tick / frame.
*
* @type {number}
* @default 0.0
*/
this.angular = 0.0;
/**
* Constant force that affects the object's rotation, this property
* basically acts as gravity for rotation. If the property is set, the
* object is forced to rotate.
*
* @type {number}
* @default 0.0
*/
this.angularAcceleration = 0.0;
/**
* Force that counteracts the rotational velocity when the rotation lacks
* acceleration, ie force that slows down the rotation.
*
* @type {number}
* @default 0.0
*/
this.angularDrag = 0.0;
/**
* Limits rotation to a maximum speed.
*
* @type {number}
* @default 100
*/
this.angularMax = 100;
/**
* Power that counteracts the velocity of the object. This force is applied
* only when the object is not accelerating. If set, the object loses its
* velocity over time.
*
* @type {rune.geom.Vector2D}
* @default new rune.geom.Vector2D(0, 0)
*/
this.drag = new rune.geom.Vector2D(0, 0);
/**
* Limits the velocity of the object in the x and y direction to a maximum
* value.
*
* @type {rune.geom.Vector2D}
* @default new rune.geom.Vector2D(100, 100)
*/
this.max = new rune.geom.Vector2D(100, 100);
};
//------------------------------------------------------------------------------
// Inheritance
//------------------------------------------------------------------------------
rune.physics.Velocity.prototype = Object.create(rune.geom.Vector2D.prototype);
rune.physics.Velocity.prototype.constructor = rune.physics.Velocity;
//------------------------------------------------------------------------------
// Public prototype methods (ENGINE)
//------------------------------------------------------------------------------
/**
* Updates the velocity in x, y and rotation.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @ignore
*/
rune.physics.Velocity.prototype.update = function(step) {
this.m_updateMotion(step);
this.m_updateAngularMotion(step);
};
//------------------------------------------------------------------------------
// Private prototype methods
//------------------------------------------------------------------------------
/**
* Updates the velocity in the x and y direction.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @private
*/
rune.physics.Velocity.prototype.m_updateMotion = function(step) {
this.x = this.m_calcVelocity(this.x, this.acceleration.x, this.drag.x, this.max.x);
this.y = this.m_calcVelocity(this.y, this.acceleration.y, this.drag.y, this.max.y);
};
/**
* Updates the velocity for rotation.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @private
*/
rune.physics.Velocity.prototype.m_updateAngularMotion = function(step) {
this.angular = this.m_calcVelocity(this.angular, this.angularAcceleration, this.angularDrag, this.angularMax);
};
/**
* Calculates new velocity.
*
* @param {number} velocity Previous velocity.
* @param {number} [acceleration=0] Acceleration speed.
* @param {number} [drag=0] Deceleration amount.
* @param {number} [max=10000] Maximum speed.
*
* @returns {number}
* @private
*/
rune.physics.Velocity.prototype.m_calcVelocity = function(velocity, acceleration, drag, max) {
var scale = rune.system.Application['instance']['time']['scale'];
acceleration = acceleration * scale || 0;
drag = drag * scale || 0;
max = max || 10000;
if (acceleration != 0) {
velocity += acceleration;
} else if (drag != 0) {
if (velocity - drag > 0) {
velocity = velocity - drag;
} else if (velocity + drag < 0) {
velocity += drag;
} else {
velocity = 0.0;
}
}
return rune.util.Math.clamp(velocity, -max, max);
};</code></pre>
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