phaser/docs/src_geom_Hermite.js.html
2016-08-26 01:24:15 +01:00

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<div id="main">
<h1 class="page-title">Source: src/geom/Hermite.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey &lt;rich@photonstorm.com>
* @author Pete Baron &lt;pete@photonstorm.com>
* @copyright 2016 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* A data representation of a Hermite Curve (see http://en.wikipedia.org/wiki/Cubic_Hermite_spline)
*
* A Hermite curve has a start and end point and tangent vectors for both of them.
* The curve will always pass through the two control points and the shape of it is controlled
* by the length and direction of the tangent vectors. At the control points the curve will
* be facing exactly in the vector direction.
*
* As these curves change speed (speed = distance between points separated by an equal change in
* 't' value - see Hermite.getPoint) this class attempts to reduce the variation by pre-calculating
* the `accuracy` number of points on the curve. The straight-line distances to these points are stored
* in the private 'points' array, and this information is used by Hermite.findT() to convert a pixel
* distance along the curve into a 'time' value.
*
* Higher `accuracy` values will result in more even movement, but require more memory for the points
* list. 5 works, but 10 seems to be an ideal value for the length of curves found in most games on
* a desktop screen. If you use very long curves (more than 400 pixels) you may need to increase
* this value further.
*
* @class Phaser.Hermite
* @constructor
* @param {number} p1x - The x coordinate of the start of the curve.
* @param {number} p1y - The y coordinate of the start of the curve.
* @param {number} p2x - The x coordinate of the end of the curve.
* @param {number} p2y - The y coordinate of the end of the curve.
* @param {number} v1x - The x component of the tangent vector for the start of the curve.
* @param {number} v1y - The y component of the tangent vector for the start of the curve.
* @param {number} v2x - The x component of the tangent vector for the end of the curve.
* @param {number} v2y - The y component of the tangent vector for the end of the curve.
* @param {number} [accuracy=10] The amount of points to pre-calculate on the curve.
*/
Phaser.Hermite = function (p1x, p1y, p2x, p2y, v1x, v1y, v2x, v2y, accuracy) {
if (accuracy === undefined) { accuracy = 10; }
/**
* @property {number} _accuracy - The amount of points to pre-calculate on the curve.
* @private
*/
this._accuracy = accuracy;
/**
* @property {number} _p1x - The x coordinate of the start of the curve.
* @private
*/
this._p1x = p1x;
/**
* @property {number} _p1y - The y coordinate of the start of the curve.
* @private
*/
this._p1y = p1y;
/**
* @property {number} _p2x - The x coordinate of the end of the curve.
* @private
*/
this._p2x = p2x;
/**
* @property {number} _p2y - The y coordinate of the end of the curve.
* @private
*/
this._p2y = p2y;
/**
* @property {number} _v1x - The x component of the tangent vector for the start of the curve.
* @private
*/
this._v1x = v1x;
/**
* @property {number} _v1y - The y component of the tangent vector for the start of the curve.
* @private
*/
this._v1y = v1y;
/**
* @property {number} _v2x - The x component of the tangent vector for the end of the curve.
* @private
*/
this._v2x = v2x;
/**
* @property {number} _v2y - The y component of the tangent vector for the end of the curve.
* @private
*/
this._v2y = v2y;
/**
* @property {array} _points - A local array of cached points.
* @private
*/
this._points = [];
/**
* @property {Phaser.Point} _temp1 - A local cached Point object.
* @private
*/
this._temp1 = new Phaser.Point();
/**
* @property {Phaser.Point} _temp2 - A local cached Point object.
* @private
*/
this._temp2 = new Phaser.Point();
this.recalculate();
};
Phaser.Hermite.prototype.constructor = Phaser.Hermite;
Phaser.Hermite.prototype = {
/**
* Performs the curve calculations.
*
* This is called automatically if you change any of the curves public properties, such as `Hermite.p1x` or `Hermite.v2y`.
*
* If you adjust any of the internal private values, then call this to update the points.
*
* @method Phaser.Hermite#recalculate
* @return {Phaser.Hermite} This object.
*/
recalculate: function () {
this._ax = (2 * this._p1x - 2 * this._p2x + this._v1x + this._v2x);
this._ay = (2 * this._p1y - 2 * this._p2y + this._v1y + this._v2y);
this._bx = (-3 * this._p1x + 3 * this._p2x - 2 * this._v1x - this._v2x);
this._by = (-3 * this._p1y + 3 * this._p2y - 2 * this._v1y - this._v2y);
this.length = this.calculateEvenPoints();
return this;
},
/**
* Calculate a number of points along the curve, based on `Hermite.accuracy`, and stores them in the private `_points` array.
*
* @method Phaser.Hermite#calculateEvenPoints
* @return {number} The total length of the curve approximated as straight line distances between the points.
*/
calculateEvenPoints: function () {
var totalLength = 0;
this._temp1.setTo(0, 0); // pnt
this._temp2.setTo(this._p1x, this._p1y); // lastPnt
this._points[0] = 0;
for (var i = 1; i &lt;= this._accuracy; i++)
{
this.getPoint(i / this._accuracy, this._temp1);
totalLength += this._temp1.distance(this._temp2);
this._points[i] = totalLength;
this._temp2.copyFrom(this._temp1);
}
return totalLength;
},
/**
* Convert a distance along this curve into a `time` value which will be between 0 and 1.
*
* For example if this curve has a length of 100 pixels then `findT(50)` would return `0.5`.
*
* @method Phaser.Hermite#findT
* @param {integer} distance - The distance into the curve in pixels. Should be a positive integer.
* @return {number} The time (`t`) value, a float between 0 and 1.
*/
findT: function (distance) {
if (distance &lt;= 0)
{
return 0;
}
// Find the _points which bracket the distance value
var ti = Math.floor(distance / this.length * this._accuracy);
while (ti > 0 &amp;&amp; this._points[ti] > distance)
{
ti--;
}
while (ti &lt; this._accuracy &amp;&amp; this._points[ti] &lt; distance)
{
ti++;
}
// Linear interpolation to get a more accurate fix
var dt = this._points[ti] - this._points[ti - 1];
var d = distance - this._points[ti - 1];
return ((ti - 1) / this._accuracy) + d / (dt * this._accuracy);
},
/**
* Get the X component of a point on the curve based on the `t` (time) value, which must be between 0 and 1.
*
* @method Phaser.Hermite#getX
* @param {number} [t=0] - The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.
* @return {number} The X component of a point on the curve based on the `t` (time) value.
*/
getX: function (t) {
if (t === undefined)
{
t = 0;
}
else
{
if (t &lt; 0)
{
t = 0;
}
if (t > 1)
{
t = 1;
}
}
var t2 = t * t;
var t3 = t * t2;
return (t3 * this._ax + t2 * this._bx + t * this._v1x + this._p1x);
},
/**
* Get the Y component of a point on the curve based on the `t` (time) value, which must be between 0 and 1.
*
* @method Phaser.Hermite#getY
* @param {number} [t=0] - The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.
* @return {number} The Y component of a point on the curve based on the `t` (time) value.
*/
getY: function (t) {
if (t === undefined)
{
t = 0;
}
else
{
if (t &lt; 0)
{
t = 0;
}
if (t > 1)
{
t = 1;
}
}
var t2 = t * t;
var t3 = t * t2;
return (t3 * this._ay + t2 * this._by + t * this._v1y + this._p1y);
},
/**
* Get a point on the curve using the `t` (time) value, which must be between 0 and 1.
*
* @method Phaser.Hermite#getPoint
* @param {number} [t=0] - The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.
* @param {Phaser.Point|Object} [point] - An optional Phaser.Point, or Object containing public `x` and `y` properties. If given the resulting values will be stored in the Objects `x` and `y` properties. If omitted a new Phaser.Point object is created.
* @return {Phaser.Point} An Object with the x, y coordinate of the curve at the specified `t` value set in its `x` and `y` properties.
*/
getPoint: function (t, point) {
if (t === undefined) { t = 0; }
if (point === undefined) { point = new Phaser.Point(); }
if (t &lt; 0)
{
t = 0;
}
if (t > 1)
{
t = 1;
}
var t2 = t * t;
var t3 = t * t2;
point.x = t3 * this._ax + t2 * this._bx + t * this._v1x + this._p1x;
point.y = t3 * this._ay + t2 * this._by + t * this._v1y + this._p1y;
return point;
},
/**
* Get a point on the curve using the distance, in pixels, along the curve.
*
* @method Phaser.Hermite#getPointWithDistance
* @param {integer} [distance=0] - The distance along the curve to get the point from, given in pixels.
* @param {Phaser.Point|Object} [point] - An optional Phaser.Point, or Object containing public `x` and `y` properties. If given the resulting values will be stored in the Objects `x` and `y` properties. If omitted a new Phaser.Point object is created.
* @return {Phaser.Point} The point on the line at the specified 'distance' along the curve.
*/
getPointWithDistance: function (distance, point) {
if (distance === undefined) { distance = 0; }
if (point === undefined) { point = new Phaser.Point(); }
if (distance &lt;= 0)
{
point.x = this._p1x;
point.y = this._p1y;
}
else
{
this.getPoint(this.findT(distance), point);
}
return point;
},
/**
* Calculate and return the angle, in radians, of the curves tangent based on time.
*
* @method Phaser.Hermite#getAngle
* @param {number} [t=0] - The `t` (time) value at which to find the angle. Must be between 0 and 1.
* @return {number} The angle of the line at the specified `t` time value along the curve. The value is in radians.
*/
getAngle: function (t) {
if (t === undefined) { t = 0; }
this.getPoint(t - 0.01, this._temp1);
this.getPoint(t + 0.01, this._temp2);
return Math.atan2(this._temp2.y - this._temp1.y, this._temp2.x - this._temp1.x);
},
/**
* Calculate and return the angle, in radians, of the curves tangent at the given pixel distance along the curves length.
*
* @method Phaser.Hermite#getAngleWithDistance
* @param {number} [distance=0] - The distance along the curve to get the angle from, in pixels.
* @return {number} The angle of the line at the specified distance along the curve. The value is in radians.
*/
getAngleWithDistance: function (distance) {
if (distance === undefined) { distance = 0; }
if (distance &lt;= 0)
{
return Math.atan2(this._v1y, this._v1x);
}
else
{
return this.getAngle(this.findT(distance));
}
},
/**
* Get the angle of the curves entry point.
*
* @method Phaser.Hermite#getEntryTangent
* @param {Phaser.Point|Object} point - The Phaser.Point object, or an Object with public `x` and `y` properties, in which the tangent vector values will be stored.
* @return {Phaser.Point} A Point object containing the tangent vector of this Hermite curve.
*/
getEntryTangent: function (point) {
point.x = this._v1x;
point.y = this._v1y;
return point;
}
};
Object.defineProperties(Phaser.Hermite.prototype, {
/**
* @name Phaser.Hermite#accuracy
* @property {number} accuracy - The amount of points to pre-calculate on the curve.
*/
accuracy: {
get: function () {
return this._accuracy;
},
set: function (value) {
if (value !== this._accuracy)
{
this._accuracy = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#p1x
* @property {number} p1x - The x coordinate of the start of the curve. Setting this value will recalculate the curve.
*/
p1x: {
get: function () {
return this._p1x;
},
set: function (value) {
if (value !== this._p1x)
{
this._p1x = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#p1y
* @property {number} p1y - The y coordinate of the start of the curve. Setting this value will recalculate the curve.
*/
p1y: {
get: function () {
return this._p1y;
},
set: function (value) {
if (value !== this._p1y)
{
this._p1y = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#p2x
* @property {number} p2x - The x coordinate of the end of the curve. Setting this value will recalculate the curve.
*/
p2x: {
get: function () {
return this._p2x;
},
set: function (value) {
if (value !== this._p2x)
{
this._p2x = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#p2y
* @property {number} p2y - The y coordinate of the end of the curve. Setting this value will recalculate the curve.
*/
p2y: {
get: function () {
return this._p2y;
},
set: function (value) {
if (value !== this._p2y)
{
this._p2y = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#v1x
* @property {number} v1x - The x component of the tangent vector for the start of the curve. Setting this value will recalculate the curve.
*/
v1x: {
get: function () {
return this._v1x;
},
set: function (value) {
if (value !== this._v1x)
{
this._v1x = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#v1y
* @property {number} v1y - The y component of the tangent vector for the start of the curve. Setting this value will recalculate the curve.
*/
v1y: {
get: function () {
return this._v1y;
},
set: function (value) {
if (value !== this._v1y)
{
this._v1y = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#v2x
* @property {number} v2x - The x component of the tangent vector for the end of the curve. Setting this value will recalculate the curve.
*/
v2x: {
get: function () {
return this._v2x;
},
set: function (value) {
if (value !== this._v2x)
{
this._v2x = value;
this.recalculate();
}
}
},
/**
* @name Phaser.Hermite#v2y
* @property {number} v2y - The y component of the tangent vector for the end of the curve. Setting this value will recalculate the curve.
*/
v2y: {
get: function () {
return this._v2y;
},
set: function (value) {
if (value !== this._v2y)
{
this._v2y = value;
this.recalculate();
}
}
}
});
</pre>
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