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<a href="Phaser.Time.html">Time</a>
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<a href="Phaser.Utils.html">Utils</a>
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<a href="Phaser.Utils.Debug.html">Debug</a>
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<a href="Phaser.World.html">World</a>
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<a href="PIXI.AbstractFilter.html">AbstractFilter</a>
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<a href="PIXI.BaseTexture.html">BaseTexture</a>
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<li class="class-depth-1"><a href="Phaser.Line.html">Line</a></li>
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|
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<li class="class-depth-1"><a href="http://examples.phaser.io">Phaser Examples</a></li>
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<li class="class-depth-1"><a href="https://github.com/photonstorm/phaser-plugins">Phaser Plugins</a></li>
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<li class="class-depth-1"><a href="http://stackoverflow.com/questions/tagged/phaser-framework">Stack Overflow</a></li>
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<li class="class-depth-1"><a href="http://www.html5gamedevs.com/topic/4470-official-phaserio-irc-channel-phaserio-on-freenode/">IRC</a></li>
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<li class="class-depth-1"><a href="https://www.gittip.com/photonstorm/">GitTip</a></li>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
|
|
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<div id="main">
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|
|
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|
|
<h1 class="page-title">Source: D:/wamp/www/phaser/src/geom/Line.js</h1>
|
|
|
|
<section>
|
|
<article>
|
|
<pre class="sunlight-highlight-javascript linenums">/**
|
|
* @author Richard Davey <rich@photonstorm.com>
|
|
* @copyright 2014 Photon Storm Ltd.
|
|
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
|
|
*/
|
|
|
|
/**
|
|
* Creates a new Line object with a start and an end point.
|
|
*
|
|
* @class Phaser.Line
|
|
* @constructor
|
|
* @param {number} [x1=0] - The x coordinate of the start of the line.
|
|
* @param {number} [y1=0] - The y coordinate of the start of the line.
|
|
* @param {number} [x2=0] - The x coordinate of the end of the line.
|
|
* @param {number} [y2=0] - The y coordinate of the end of the line.
|
|
*/
|
|
Phaser.Line = function (x1, y1, x2, y2) {
|
|
|
|
x1 = x1 || 0;
|
|
y1 = y1 || 0;
|
|
x2 = x2 || 0;
|
|
y2 = y2 || 0;
|
|
|
|
/**
|
|
* @property {Phaser.Point} start - The start point of the line.
|
|
*/
|
|
this.start = new Phaser.Point(x1, y1);
|
|
|
|
/**
|
|
* @property {Phaser.Point} end - The end point of the line.
|
|
*/
|
|
this.end = new Phaser.Point(x2, y2);
|
|
|
|
};
|
|
|
|
Phaser.Line.prototype = {
|
|
|
|
/**
|
|
* Sets the components of the Line to the specified values.
|
|
*
|
|
* @method Phaser.Line#setTo
|
|
* @param {number} [x1=0] - The x coordinate of the start of the line.
|
|
* @param {number} [y1=0] - The y coordinate of the start of the line.
|
|
* @param {number} [x2=0] - The x coordinate of the end of the line.
|
|
* @param {number} [y2=0] - The y coordinate of the end of the line.
|
|
* @return {Phaser.Line} This line object
|
|
*/
|
|
setTo: function (x1, y1, x2, y2) {
|
|
|
|
this.start.setTo(x1, y1);
|
|
this.end.setTo(x2, y2);
|
|
|
|
return this;
|
|
|
|
},
|
|
|
|
/**
|
|
* Sets the line to match the x/y coordinates of the two given sprites.
|
|
* Can optionally be calculated from their center coordinates.
|
|
*
|
|
* @method Phaser.Line#fromSprite
|
|
* @param {Phaser.Sprite} startSprite - The coordinates of this Sprite will be set to the Line.start point.
|
|
* @param {Phaser.Sprite} endSprite - The coordinates of this Sprite will be set to the Line.start point.
|
|
* @param {boolean} [useCenter=false] - If true it will use startSprite.center.x, if false startSprite.x. Note that Sprites don't have a center property by default, so only enable if you've over-ridden your Sprite with a custom class.
|
|
* @return {Phaser.Line} This line object
|
|
*/
|
|
fromSprite: function (startSprite, endSprite, useCenter) {
|
|
|
|
if (typeof useCenter === 'undefined') { useCenter = false; }
|
|
|
|
if (useCenter)
|
|
{
|
|
return this.setTo(startSprite.center.x, startSprite.center.y, endSprite.center.x, endSprite.center.y);
|
|
}
|
|
|
|
return this.setTo(startSprite.x, startSprite.y, endSprite.x, endSprite.y);
|
|
|
|
},
|
|
|
|
/**
|
|
* Sets this line to start at the given `x` and `y` coordinates and for the segment to extend at `angle` for the given `length`.
|
|
*
|
|
* @method Phaser.Line#fromAngle
|
|
* @param {number} x - The x coordinate of the start of the line.
|
|
* @param {number} y - The y coordinate of the start of the line.
|
|
* @param {number} angle - The angle of the line in radians.
|
|
* @param {number} length - The length of the line in pixels.
|
|
* @return {Phaser.Line} This line object
|
|
*/
|
|
fromAngle: function (x, y, angle, length) {
|
|
|
|
this.start.setTo(x, y);
|
|
this.end.setTo(x + (Math.cos(angle) * length), y + (Math.sin(angle) * length));
|
|
|
|
return this;
|
|
|
|
},
|
|
|
|
/**
|
|
* Checks for intersection between this line and another Line.
|
|
* If asSegment is true it will check for segment intersection. If asSegment is false it will check for line intersection.
|
|
* Returns the intersection segment of AB and EF as a Point, or null if there is no intersection.
|
|
*
|
|
* @method Phaser.Line#intersects
|
|
* @param {Phaser.Line} line - The line to check against this one.
|
|
* @param {boolean} [asSegment=true] - If true it will check for segment intersection, otherwise full line intersection.
|
|
* @param {Phaser.Point} [result] - A Point object to store the result in, if not given a new one will be created.
|
|
* @return {Phaser.Point} The intersection segment of the two lines as a Point, or null if there is no intersection.
|
|
*/
|
|
intersects: function (line, asSegment, result) {
|
|
|
|
return Phaser.Line.intersectsPoints(this.start, this.end, line.start, line.end, asSegment, result);
|
|
|
|
},
|
|
|
|
/**
|
|
* Returns the reflected angle between two lines.
|
|
* This is the outgoing angle based on the angle of this line and the normalAngle of the given line.
|
|
*
|
|
* @method Phaser.Line#reflect
|
|
* @param {Phaser.Line} line - The line to reflect off this line.
|
|
* @return {number} The reflected angle in radians.
|
|
*/
|
|
reflect: function (line) {
|
|
|
|
return Phaser.Line.reflect(this, line);
|
|
|
|
},
|
|
|
|
/**
|
|
* Tests if the given coordinates fall on this line. See pointOnSegment to test against just the line segment.
|
|
*
|
|
* @method Phaser.Line#pointOnLine
|
|
* @param {number} x - The line to check against this one.
|
|
* @param {number} y - The line to check against this one.
|
|
* @return {boolean} True if the point is on the line, false if not.
|
|
*/
|
|
pointOnLine: function (x, y) {
|
|
|
|
return ((x - this.start.x) * (this.end.y - this.start.y) === (this.end.x - this.start.x) * (y - this.start.y));
|
|
|
|
},
|
|
|
|
/**
|
|
* Tests if the given coordinates fall on this line and within the segment. See pointOnLine to test against just the line.
|
|
*
|
|
* @method Phaser.Line#pointOnSegment
|
|
* @param {number} x - The line to check against this one.
|
|
* @param {number} y - The line to check against this one.
|
|
* @return {boolean} True if the point is on the line and segment, false if not.
|
|
*/
|
|
pointOnSegment: function (x, y) {
|
|
|
|
var xMin = Math.min(this.start.x, this.end.x);
|
|
var xMax = Math.max(this.start.x, this.end.x);
|
|
var yMin = Math.min(this.start.y, this.end.y);
|
|
var yMax = Math.max(this.start.y, this.end.y);
|
|
|
|
return (this.pointOnLine(x, y) && (x >= xMin && x <= xMax) && (y >= yMin && y <= yMax));
|
|
|
|
},
|
|
|
|
/**
|
|
* Using Bresenham's line algorithm this will return an array of all coordinates on this line.
|
|
* The start and end points are rounded before this runs as the algorithm works on integers.
|
|
*
|
|
* @method Phaser.Line#coordinatesOnLine
|
|
* @param {number} [stepRate=1] - How many steps will we return? 1 = every coordinate on the line, 2 = every other coordinate, etc.
|
|
* @param {array} [results] - The array to store the results in. If not provided a new one will be generated.
|
|
* @return {array} An array of coordinates.
|
|
*/
|
|
coordinatesOnLine: function (stepRate, results) {
|
|
|
|
if (typeof stepRate === 'undefined') { stepRate = 1; }
|
|
if (typeof results === 'undefined') { results = []; }
|
|
|
|
var x1 = Math.round(this.start.x);
|
|
var y1 = Math.round(this.start.y);
|
|
var x2 = Math.round(this.end.x);
|
|
var y2 = Math.round(this.end.y);
|
|
|
|
var dx = Math.abs(x2 - x1);
|
|
var dy = Math.abs(y2 - y1);
|
|
var sx = (x1 < x2) ? 1 : -1;
|
|
var sy = (y1 < y2) ? 1 : -1;
|
|
var err = dx - dy;
|
|
|
|
results.push([x1, y1]);
|
|
|
|
var i = 1;
|
|
|
|
while (!((x1 == x2) && (y1 == y2)))
|
|
{
|
|
var e2 = err << 1;
|
|
|
|
if (e2 > -dy)
|
|
{
|
|
err -= dy;
|
|
x1 += sx;
|
|
}
|
|
|
|
if (e2 < dx)
|
|
{
|
|
err += dx;
|
|
y1 += sy;
|
|
}
|
|
|
|
if (i % stepRate === 0)
|
|
{
|
|
results.push([x1, y1]);
|
|
}
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
return results;
|
|
|
|
},
|
|
|
|
/**
|
|
* Returns a new Line object with the same values for the start and end properties as this Line object.
|
|
* @method Phaser.Line#clone
|
|
* @param {Phaser.Line} output - Optional Line object. If given the values will be set into the object, otherwise a brand new Line object will be created and returned.
|
|
* @return {Phaser.Line} The cloned Line object.
|
|
*/
|
|
clone: function (output) {
|
|
|
|
if (typeof output === "undefined" || output === null)
|
|
{
|
|
output = new Phaser.Line(this.start.x, this.start.y, this.end.x, this.end.y);
|
|
}
|
|
else
|
|
{
|
|
output.setTo(this.start.x, this.start.y, this.end.x, this.end.y);
|
|
}
|
|
|
|
return output;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* @name Phaser.Line#length
|
|
* @property {number} length - Gets the length of the line segment.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "length", {
|
|
|
|
get: function () {
|
|
return Math.sqrt((this.end.x - this.start.x) * (this.end.x - this.start.x) + (this.end.y - this.start.y) * (this.end.y - this.start.y));
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#angle
|
|
* @property {number} angle - Gets the angle of the line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "angle", {
|
|
|
|
get: function () {
|
|
return Math.atan2(this.end.y - this.start.y, this.end.x - this.start.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#slope
|
|
* @property {number} slope - Gets the slope of the line (y/x).
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "slope", {
|
|
|
|
get: function () {
|
|
return (this.end.y - this.start.y) / (this.end.x - this.start.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#perpSlope
|
|
* @property {number} perpSlope - Gets the perpendicular slope of the line (x/y).
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "perpSlope", {
|
|
|
|
get: function () {
|
|
return -((this.end.x - this.start.x) / (this.end.y - this.start.y));
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#x
|
|
* @property {number} x - Gets the x coordinate of the top left of the bounds around this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "x", {
|
|
|
|
get: function () {
|
|
return Math.min(this.start.x, this.end.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#y
|
|
* @property {number} y - Gets the y coordinate of the top left of the bounds around this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "y", {
|
|
|
|
get: function () {
|
|
return Math.min(this.start.y, this.end.y);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#left
|
|
* @property {number} left - Gets the left-most point of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "left", {
|
|
|
|
get: function () {
|
|
return Math.min(this.start.x, this.end.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#right
|
|
* @property {number} right - Gets the right-most point of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "right", {
|
|
|
|
get: function () {
|
|
return Math.max(this.start.x, this.end.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#top
|
|
* @property {number} top - Gets the top-most point of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "top", {
|
|
|
|
get: function () {
|
|
return Math.min(this.start.y, this.end.y);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#bottom
|
|
* @property {number} bottom - Gets the bottom-most point of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "bottom", {
|
|
|
|
get: function () {
|
|
return Math.max(this.start.y, this.end.y);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#width
|
|
* @property {number} width - Gets the width of this bounds of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "width", {
|
|
|
|
get: function () {
|
|
return Math.abs(this.start.x - this.end.x);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#height
|
|
* @property {number} height - Gets the height of this bounds of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "height", {
|
|
|
|
get: function () {
|
|
return Math.abs(this.start.y - this.end.y);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#normalX
|
|
* @property {number} normalX - Gets the x component of the left-hand normal of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "normalX", {
|
|
|
|
get: function () {
|
|
return Math.cos(this.angle - 1.5707963267948966);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#normalY
|
|
* @property {number} normalY - Gets the y component of the left-hand normal of this line.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "normalY", {
|
|
|
|
get: function () {
|
|
return Math.sin(this.angle - 1.5707963267948966);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* @name Phaser.Line#normalAngle
|
|
* @property {number} normalAngle - Gets the angle in radians of the normal of this line (line.angle - 90 degrees.)
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Line.prototype, "normalAngle", {
|
|
|
|
get: function () {
|
|
return Phaser.Math.wrap(this.angle - 1.5707963267948966, -Math.PI, Math.PI);
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* Checks for intersection between two lines as defined by the given start and end points.
|
|
* If asSegment is true it will check for line segment intersection. If asSegment is false it will check for line intersection.
|
|
* Returns the intersection segment of AB and EF as a Point, or null if there is no intersection.
|
|
* Adapted from code by Keith Hair
|
|
*
|
|
* @method Phaser.Line.intersectsPoints
|
|
* @param {Phaser.Point} a - The start of the first Line to be checked.
|
|
* @param {Phaser.Point} b - The end of the first line to be checked.
|
|
* @param {Phaser.Point} e - The start of the second Line to be checked.
|
|
* @param {Phaser.Point} f - The end of the second line to be checked.
|
|
* @param {boolean} [asSegment=true] - If true it will check for segment intersection, otherwise full line intersection.
|
|
* @param {Phaser.Point|object} [result] - A Point object to store the result in, if not given a new one will be created.
|
|
* @return {Phaser.Point} The intersection segment of the two lines as a Point, or null if there is no intersection.
|
|
*/
|
|
Phaser.Line.intersectsPoints = function (a, b, e, f, asSegment, result) {
|
|
|
|
if (typeof asSegment === 'undefined') { asSegment = true; }
|
|
if (typeof result === 'undefined') { result = new Phaser.Point(); }
|
|
|
|
var a1 = b.y - a.y;
|
|
var a2 = f.y - e.y;
|
|
var b1 = a.x - b.x;
|
|
var b2 = e.x - f.x;
|
|
var c1 = (b.x * a.y) - (a.x * b.y);
|
|
var c2 = (f.x * e.y) - (e.x * f.y);
|
|
var denom = (a1 * b2) - (a2 * b1);
|
|
|
|
if (denom === 0)
|
|
{
|
|
return null;
|
|
}
|
|
|
|
result.x = ((b1 * c2) - (b2 * c1)) / denom;
|
|
result.y = ((a2 * c1) - (a1 * c2)) / denom;
|
|
|
|
if (asSegment)
|
|
{
|
|
var uc = ((f.y - e.y) * (b.x - a.x) - (f.x - e.x) * (b.y - a.y));
|
|
var ua = (((f.x - e.x) * (a.y - e.y)) - (f.y - e.y) * (a.x - e.x)) / uc;
|
|
var ub = (((b.x - a.x) * (a.y - e.y)) - ((b.y - a.y) * (a.x - e.x))) / uc;
|
|
|
|
if (ua >= 0 && ua <= 1 && ub >= 0 && ub <= 1)
|
|
{
|
|
return result;
|
|
}
|
|
else
|
|
{
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
|
|
};
|
|
|
|
/**
|
|
* Checks for intersection between two lines.
|
|
* If asSegment is true it will check for segment intersection.
|
|
* If asSegment is false it will check for line intersection.
|
|
* Returns the intersection segment of AB and EF as a Point, or null if there is no intersection.
|
|
* Adapted from code by Keith Hair
|
|
*
|
|
* @method Phaser.Line.intersects
|
|
* @param {Phaser.Line} a - The first Line to be checked.
|
|
* @param {Phaser.Line} b - The second Line to be checked.
|
|
* @param {boolean} [asSegment=true] - If true it will check for segment intersection, otherwise full line intersection.
|
|
* @param {Phaser.Point} [result] - A Point object to store the result in, if not given a new one will be created.
|
|
* @return {Phaser.Point} The intersection segment of the two lines as a Point, or null if there is no intersection.
|
|
*/
|
|
Phaser.Line.intersects = function (a, b, asSegment, result) {
|
|
|
|
return Phaser.Line.intersectsPoints(a.start, a.end, b.start, b.end, asSegment, result);
|
|
|
|
};
|
|
|
|
/**
|
|
* Returns the reflected angle between two lines.
|
|
* This is the outgoing angle based on the angle of Line 1 and the normalAngle of Line 2.
|
|
*
|
|
* @method Phaser.Line.reflect
|
|
* @param {Phaser.Line} a - The base line.
|
|
* @param {Phaser.Line} b - The line to be reflected from the base line.
|
|
* @return {number} The reflected angle in radians.
|
|
*/
|
|
Phaser.Line.reflect = function (a, b) {
|
|
|
|
return 2 * b.normalAngle - 3.141592653589793 - a.angle;
|
|
|
|
};
|
|
</pre>
|
|
</article>
|
|
</section>
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<div class="clearfix"></div>
|
|
<footer>
|
|
|
|
|
|
<span class="copyright">
|
|
Phaser Copyright © 2012-2014 Photon Storm Ltd.
|
|
</span>
|
|
<br />
|
|
|
|
<span class="jsdoc-message">
|
|
Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a>
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on Tue Jan 06 2015 06:31:48 GMT-0000 (GMT) using the <a href="https://github.com/terryweiss/docstrap">DocStrap template</a>.
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</footer>
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<br clear="both">
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<script src="scripts/sunlight.js"></script>
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<script src="scripts/sunlight.javascript.js"></script>
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<script src="scripts/sunlight-plugin.doclinks.js"></script>
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<script> Sunlight.highlightAll({lineNumbers:true, showMenu: true, enableDoclinks :true}); </script>
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<script>
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$( function () {
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$( "#toc" ).toc( {
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anchorName : function(i, heading, prefix) {
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return $(heading).attr("id") || ( prefix + i );
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scrollTo : 60
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} );
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$( "#toc>ul" ).addClass( "nav nav-pills nav-stacked" );
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$( "#main span[id^='toc']" ).addClass( "toc-shim" );
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} );
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</script>
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</body>
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