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< h1 class = "page-title" > Source: 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 Line
* @classdesc 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.
* @return {Phaser.Line} This line object
*/
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.
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* @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.
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* @return {Phaser.Line} This line object
*/
fromSprite: function (startSprite, endSprite, useCenter) {
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if (typeof useCenter === 'undefined') { useCenter = false; }
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if (useCenter)
{
return this.setTo(startSprite.center.x, startSprite.center.y, endSprite.center.x, endSprite.center.y);
}
else
{
return this.setTo(startSprite.x, startSprite.y, endSprite.x, endSprite.y);
}
},
/**
* 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);
},
/**
* 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.end.y) === (this.end.x - this.start.x) * (y - this.end.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);
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return (this.pointOnLine(x, y) & & (x >= xMin & & x < = xMax) & & (y >= yMin & & y < = yMax));
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},
/**
* 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;
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while (!((x1 == x2) & & (y1 == y2)))
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{
var e2 = err < < 1;
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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;
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}
};
/**
* @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 () {
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return Math.atan2(this.end.y - this.start.y, this.end.x - this.start.x);
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}
});
/**
* @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));
}
});
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/**
* @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);
}
});
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/**
* 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
*
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* @method Phaser.Line.intersectsPoints
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* @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} [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;
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if (asSegment)
{
if (Math.pow((result.x - b.x) + (result.y - b.y), 2) > Math.pow((a.x - b.x) + (a.y - b.y), 2))
{
return null;
}
if (Math.pow((result.x - a.x) + (result.y - a.y), 2) > Math.pow((a.x - b.x) + (a.y - b.y), 2))
{
return null;
}
if (Math.pow((result.x - f.x) + (result.y - f.y), 2) > Math.pow((e.x - f.x) + (e.y - f.y), 2))
{
return null;
}
if (Math.pow((result.x - e.x) + (result.y - e.y), 2) > Math.pow((e.x - f.x) + (e.y - f.y), 2))
{
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);
};
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