These docs are for an outdated version of Phaser The documentation on this page is for Phaser 2.6.2. The latest release is 2.7.3.

Constructor

Phaser. Line

new Line(x1, y1, x2, y2)

Creates a new Line object with a start and an end point.

Parameters
Name Type Argument Default Description
x1 number <optional>
0

The x coordinate of the start of the line.

y1 number <optional>
0

The y coordinate of the start of the line.

x2 number <optional>
0

The x coordinate of the end of the line.

y2 number <optional>
0

The y coordinate of the end of the line.

Source code: geom/Line.js (Line 17)

Public Properties

[readonly] angle : number

Gets the angle of the line in radians.

Source code: geom/Line.js (Line 372)

[readonly] bottom : number

Gets the bottom-most point of this line.

Source code: geom/Line.js (Line 476)

end : Phaser.Point

The end point of the line.

Source code: geom/Line.js (Line 32)

[readonly] height : number

Gets the height of this bounds of this line.

Source code: geom/Line.js (Line 502)

[readonly] left : number

Gets the left-most point of this line.

Source code: geom/Line.js (Line 437)

[readonly] length : number

Gets the length of the line segment.

Source code: geom/Line.js (Line 359)

[readonly] normalAngle : number

Gets the angle in radians of the normal of this line (line.angle - 90 degrees.)

Source code: geom/Line.js (Line 541)

[readonly] normalX : number

Gets the x component of the left-hand normal of this line.

Source code: geom/Line.js (Line 515)

[readonly] normalY : number

Gets the y component of the left-hand normal of this line.

Source code: geom/Line.js (Line 528)

[readonly] perpSlope : number

Gets the perpendicular slope of the line (x/y).

Source code: geom/Line.js (Line 398)

Gets the right-most point of this line.

Source code: geom/Line.js (Line 450)

[readonly] slope : number

Gets the slope of the line (y/x).

Source code: geom/Line.js (Line 385)

start : Phaser.Point

The start point of the line.

Source code: geom/Line.js (Line 27)

[readonly] top : number

Gets the top-most point of this line.

Source code: geom/Line.js (Line 463)

[readonly] type : number

The const type of this object.

Source code: geom/Line.js (Line 38)

[readonly] width : number

Gets the width of this bounds of this line.

Source code: geom/Line.js (Line 489)

[readonly] x : number

Gets the x coordinate of the top left of the bounds around this line.

Source code: geom/Line.js (Line 411)

[readonly] y : number

Gets the y coordinate of the top left of the bounds around this line.

Source code: geom/Line.js (Line 424)

Public Methods

<static> intersects(a, b, asSegment, result) → {Phaser.Point}

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

Parameters
Name Type Argument Default Description
a Phaser.Line

The first Line to be checked.

b Phaser.Line

The second Line to be checked.

asSegment boolean <optional>
true

If true it will check for segment intersection, otherwise full line intersection.

result Phaser.Point <optional>

A Point object to store the result in, if not given a new one will be created.

Returns

The intersection segment of the two lines as a Point, or null if there is no intersection.

Source code: geom/Line.js (Line 610)

<static> intersectsPoints(a, b, e, f, asSegment, result) → {Phaser.Point}

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

Parameters
Name Type Argument Default Description
a Phaser.Point

The start of the first Line to be checked.

b Phaser.Point

The end of the first line to be checked.

e Phaser.Point

The start of the second Line to be checked.

f Phaser.Point

The end of the second line to be checked.

asSegment boolean <optional>
true

If true it will check for segment intersection, otherwise full line intersection.

result Phaser.Point | object <optional>

A Point object to store the result in, if not given a new one will be created.

Returns

The intersection segment of the two lines as a Point, or null if there is no intersection.

Source code: geom/Line.js (Line 554)

<static> intersectsRectangle(line, rect) → {boolean}

Checks for intersection between the Line and a Rectangle shape, or a rectangle-like
object, with public x, y, right and bottom properties, such as a Sprite or Body.

An intersection is considered valid if:

The line starts within, or ends within, the Rectangle.
The line segment intersects one of the 4 rectangle edges.

The for the purposes of this function rectangles are considered 'solid'.

Parameters
Name Type Description
line Phaser.Line

The line to check for intersection with.

rect Phaser.Rectangle | object

The rectangle, or rectangle-like object, to check for intersection with.

Returns
boolean -

True if the line intersects with the rectangle edges, or starts or ends within the rectangle.

Source code: geom/Line.js (Line 630)

<static> reflect(a, b) → {number}

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.

Parameters
Name Type Description
a Phaser.Line

The base line.

b Phaser.Line

The line to be reflected from the base line.

Returns
number -

The reflected angle in radians.

Source code: geom/Line.js (Line 722)

centerOn(x, y) → {Phaser.Line}

Centers this Line on the given coordinates.

The line is centered by positioning the start and end points so that the lines midpoint matches
the coordinates given.

Parameters
Name Type Description
x number

The x position to center the line on.

y number

The y position to center the line on.

Returns

This line object

Source code: geom/Line.js (Line 200)

clone(output) → {Phaser.Line}

Returns a new Line object with the same values for the start and end properties as this Line object.

Parameters
Name Type Description
output Phaser.Line

Optional Line object. If given the values will be set into the object, otherwise a brand new Line object will be created and returned.

Returns

The cloned Line object.

Source code: geom/Line.js (Line 336)

coordinatesOnLine(stepRate, results) → {array}

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.

Parameters
Name Type Argument Default Description
stepRate number <optional>
1

How many steps will we return? 1 = every coordinate on the line, 2 = every other coordinate, etc.

results array <optional>

The array to store the results in. If not provided a new one will be generated.

Returns
array -

An array of coordinates.

Source code: geom/Line.js (Line 278)

fromAngle(x, y, angle, length) → {Phaser.Line}

Sets this line to start at the given x and y coordinates and for the segment to extend at angle for the given length.

Parameters
Name Type Description
x number

The x coordinate of the start of the line.

y number

The y coordinate of the start of the line.

angle number

The angle of the line in radians.

length number

The length of the line in pixels.

Returns

This line object

Source code: geom/Line.js (Line 86)

fromSprite(startSprite, endSprite, useCenter) → {Phaser.Line}

Sets the line to match the x/y coordinates of the two given sprites.
Can optionally be calculated from their center coordinates.

Parameters
Name Type Argument Default Description
startSprite Phaser.Sprite

The coordinates of this Sprite will be set to the Line.start point.

endSprite Phaser.Sprite

The coordinates of this Sprite will be set to the Line.start point.

useCenter boolean <optional>
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.

Returns

This line object

Source code: geom/Line.js (Line 63)

intersects(line, asSegment, result) → {Phaser.Point}

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.

Parameters
Name Type Argument Default Description
line Phaser.Line

The line to check against this one.

asSegment boolean <optional>
true

If true it will check for segment intersection, otherwise full line intersection.

result Phaser.Point <optional>

A Point object to store the result in, if not given a new one will be created.

Returns

The intersection segment of the two lines as a Point, or null if there is no intersection.

Source code: geom/Line.js (Line 151)

midPoint(out) → {Phaser.Point}

Returns a Point object where the x and y values correspond to the center (or midpoint) of the Line segment.

Parameters
Name Type Argument Description
out Phaser.Point <optional>

A Phaser.Point object into which the result will be populated. If not given a new Point object is created.

Returns

A Phaser.Point object with the x and y values set to the center of the line segment.

Source code: geom/Line.js (Line 182)

pointOnLine(x, y) → {boolean}

Tests if the given coordinates fall on this line. See pointOnSegment to test against just the line segment.

Parameters
Name Type Description
x number

The line to check against this one.

y number

The line to check against this one.

Returns
boolean -

True if the point is on the line, false if not.

Source code: geom/Line.js (Line 224)

pointOnSegment(x, y) → {boolean}

Tests if the given coordinates fall on this line and within the segment. See pointOnLine to test against just the line.

Parameters
Name Type Description
x number

The line to check against this one.

y number

The line to check against this one.

Returns
boolean -

True if the point is on the line and segment, false if not.

Source code: geom/Line.js (Line 238)

random(out) → {Phaser.Point}

Picks a random point from anywhere on the Line segment and returns it.

Parameters
Name Type Argument Description
out Phaser.Point | object <optional>

A Phaser.Point, or any object with public x/y properties, that the values will be set in.
If no object is provided a new Phaser.Point object will be created. In high performance areas avoid this by re-using an object.

Returns

An object containing the random point in its x and y properties.

Source code: geom/Line.js (Line 257)

reflect(line) → {number}

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.

Parameters
Name Type Description
line Phaser.Line

The line to reflect off this line.

Returns
number -

The reflected angle in radians.

Source code: geom/Line.js (Line 168)

rotate(angle, asDegrees) → {Phaser.Line}

Rotates the line by the amount specified in angle.

Rotation takes place from the center of the line.
If you wish to rotate around a different point see Line.rotateAround.

If you wish to rotate the ends of the Line then see Line.start.rotate or Line.end.rotate.

Parameters
Name Type Argument Default Description
angle number

The angle in radians (unless asDegrees is true) to rotate the line by.

asDegrees boolean <optional>
false

Is the given angle in radians (false) or degrees (true)?

Returns

This line object

Source code: geom/Line.js (Line 105)

rotateAround(x, y, angle, asDegrees) → {Phaser.Line}

Rotates the line by the amount specified in angle.

Rotation takes place around the coordinates given.

Parameters
Name Type Argument Default Description
x number

The x coordinate to offset the rotation from.

y number

The y coordinate to offset the rotation from.

angle number

The angle in radians (unless asDegrees is true) to rotate the line by.

asDegrees boolean <optional>
false

Is the given angle in radians (false) or degrees (true)?

Returns

This line object

Source code: geom/Line.js (Line 130)

setTo(x1, y1, x2, y2) → {Phaser.Line}

Sets the components of the Line to the specified values.

Parameters
Name Type Argument Default Description
x1 number <optional>
0

The x coordinate of the start of the line.

y1 number <optional>
0

The y coordinate of the start of the line.

x2 number <optional>
0

The x coordinate of the end of the line.

y2 number <optional>
0

The y coordinate of the end of the line.

Returns

This line object

Source code: geom/Line.js (Line 44)

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