A higher-order Bézier curve constructed of four points.
Constructor
new CubicBezier(p0, p1, p2, p3)
Parameters
name | type | optional | description |
|---|---|---|---|
p0 | Phaser.Math.Vector2 | Array.<Phaser.Math.Vector2> | No | Start point, or an array of point pairs. |
p1 | No | Control Point 1. | |
p2 | No | Control Point 2. | |
p3 | No | End Point. |
Scope: static
Extends
Source: src/curves/CubicBezierCurve.js#L14
Since: 3.0.0
Public Members
active
active: boolean
Description:
For a curve on a Path, false means the Path will ignore this curve.
Inherits: Phaser.Curves.Curve#active
Source: src/curves/Curve.js#L80
Since: 3.0.0
arcLengthDivisions
arcLengthDivisions: number
Description:
The quantity of arc length divisions within the curve.
Inherits: Phaser.Curves.Curve#arcLengthDivisions
Source: src/curves/Curve.js#L50
Since: 3.0.0
cacheArcLengths
cacheArcLengths: Array.<number>
Description:
An array of cached arc length values.
Inherits: Phaser.Curves.Curve#cacheArcLengths
Source: src/curves/Curve.js#L60
Since: 3.0.0
defaultDivisions
defaultDivisions: number
Description:
The default number of divisions within the curve.
Inherits: Phaser.Curves.Curve#defaultDivisions
Source: src/curves/Curve.js#L40
Since: 3.0.0
needsUpdate
needsUpdate: boolean
Description:
Does the data of this curve need updating?
Inherits: Phaser.Curves.Curve#needsUpdate
Source: src/curves/Curve.js#L70
Since: 3.0.0
p0
p0: Phaser.Math.Vector2
Description:
The start point of this curve.
Source: src/curves/CubicBezierCurve.js#L47
Since: 3.0.0
p1
p1: Phaser.Math.Vector2
Description:
The first control point of this curve.
Source: src/curves/CubicBezierCurve.js#L56
Since: 3.0.0
p2
p2: Phaser.Math.Vector2
Description:
The second control point of this curve.
Source: src/curves/CubicBezierCurve.js#L65
Since: 3.0.0
p3
p3: Phaser.Math.Vector2
Description:
The end point of this curve.
Source: src/curves/CubicBezierCurve.js#L74
Since: 3.0.0
type
type: string
Description:
String based identifier for the type of curve.
Inherits: Phaser.Curves.Curve#type
Source: src/curves/Curve.js#L31
Since: 3.0.0
Private Members
_tmpVec2A
_tmpVec2A: Phaser.Math.Vector2
Description:
A temporary calculation Vector.
Access: private
Inherits: Phaser.Curves.Curve#_tmpVec2A
Source: src/curves/Curve.js#L90
Since: 3.0.0
_tmpVec2B
_tmpVec2B: Phaser.Math.Vector2
Description:
A temporary calculation Vector.
Access: private
Inherits: Phaser.Curves.Curve#_tmpVec2B
Source: src/curves/Curve.js#L100
Since: 3.0.0
Public Methods
draw
<instance> draw(graphics, [pointsTotal])
Description:
Draws this curve to the specified graphics object.
Tags:
- generic
Parameters:
name | type | optional | default | description |
|---|---|---|---|---|
graphics | No | The graphics object this curve should be drawn to. | ||
pointsTotal | number | Yes | 32 | The number of intermediary points that make up this curve. A higher number of points will result in a smoother curve. |
Overrides: Phaser.Curves.Curve#draw
Returns: Phaser.GameObjects.Graphics - The graphics object this curve was drawn to. Useful for method chaining.
Source: src/curves/CubicBezierCurve.js#L143
Since: 3.0.0
fromJSON
<static> fromJSON(data)
Description:
Generates a curve from a JSON object.
Parameters:
name | type | optional | description |
|---|---|---|---|
data | No | The JSON object containing this curve data. |
Returns: Phaser.Curves.CubicBezier - The curve generated from the JSON object.
Source: src/curves/CubicBezierCurve.js#L199
Since: 3.0.0
getBounds
<instance> getBounds([out], [accuracy])
Description:
Returns a Rectangle where the position and dimensions match the bounds of this Curve.
You can control the accuracy of the bounds. The value given is used to work out how many points to plot across the curve. Higher values are more accurate at the cost of calculation speed.
Parameters:
name | type | optional | default | description |
|---|---|---|---|---|
out | Yes | The Rectangle to store the bounds in. If falsey a new object will be created. | ||
accuracy | number | Yes | 16 | The accuracy of the bounds calculations. |
Returns: Phaser.Geom.Rectangle - A Rectangle object holding the bounds of this curve. If out was given it will be this object.
Inherits: Phaser.Curves.Curve#getBounds
Source: src/curves/Curve.js#L135
Since: 3.0.0
getDistancePoints
<instance> getDistancePoints(distance)
Description:
Returns an array of points, spaced out X distance pixels apart. The smaller the distance, the larger the array will be.
Parameters:
name | type | optional | description |
|---|---|---|---|
distance | number | No | The distance, in pixels, between each point along the curve. |
Returns: Array.<Phaser.Geom.Point> - An Array of Point objects.
Inherits: Phaser.Curves.Curve#getDistancePoints
Source: src/curves/Curve.js#L169
Since: 3.0.0
getEndPoint
<instance> getEndPoint([out])
Description:
Get a point at the end of the curve.
Parameters:
name | type | optional | description |
|---|---|---|---|
out | Yes | Optional Vector object to store the result in. |
Returns: Phaser.Math.Vector2 - Vector2 containing the coordinates of the curves end point.
Inherits: Phaser.Curves.Curve#getEndPoint
Source: src/curves/Curve.js#L189
Since: 3.0.0
getLength
<instance> getLength()
Description:
Get total curve arc length
Returns: number - The total length of the curve.
Inherits: Phaser.Curves.Curve#getLength
Source: src/curves/Curve.js#L206
Since: 3.0.0
getLengths
<instance> getLengths([divisions])
Description:
Get a list of cumulative segment lengths.
These lengths are
- [0] 0
- [1] The first segment
- [2] The first and second segment
- ...
- [divisions] All segments
Parameters:
name | type | optional | description |
|---|---|---|---|
divisions | number | Yes | The number of divisions or segments. |
Returns: Array.<number> - An array of cumulative lengths.
Inherits: Phaser.Curves.Curve#getLengths
Source: src/curves/Curve.js#L222
Since: 3.0.0
getPoint
<instance> getPoint(t, [out])
Description:
Get point at relative position in curve according to length.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
t | number | No | The position along the curve to return. Where 0 is the start and 1 is the end. |
out | Yes | A Vector2 object to store the result in. If not given will be created. |
Returns: Phaser.Math.Vector2 - The coordinates of the point on the curve. If an out object was given this will be returned.
Source: src/curves/CubicBezierCurve.js#L118
Since: 3.0.0
getPointAt
<instance> getPointAt(u, [out])
Description:
Get a point at a relative position on the curve, by arc length.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
u | number | No | The relative position, [0..1]. |
out | Yes | A point to store the result in. |
Returns: Phaser.Math.Vector2 - The point.
Inherits: Phaser.Curves.Curve#getPointAt
Source: src/curves/Curve.js#L278
Since: 3.0.0
getPoints
<instance> getPoints([divisions], [stepRate], [out])
Description:
Get a sequence of evenly spaced points from the curve.
You can pass divisions, stepRate, or neither.
The number of divisions will be
divisions, ifdivisions> 0; orthis.getLength / stepRate, ifstepRate> 0; orthis.defaultDivisions
1 + divisions points will be returned.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
divisions | number | Yes | The number of divisions to make. |
stepRate | number | Yes | The curve distance between points, implying |
out | array | Array.<Phaser.Math.Vector2> | Yes | An optional array to store the points in. |
Returns: array, Array.<Phaser.Math.Vector2> - An array of Points from the curve.
Inherits: Phaser.Curves.Curve#getPoints
Source: src/curves/Curve.js#L300
Since: 3.0.0
getRandomPoint
<instance> getRandomPoint([out])
Description:
Get a random point from the curve.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
out | Yes | A point object to store the result in. |
Returns: Phaser.Math.Vector2 - The point.
Inherits: Phaser.Curves.Curve#getRandomPoint
Source: src/curves/Curve.js#L349
Since: 3.0.0
getResolution
<instance> getResolution(divisions)
Description:
Returns the resolution of this curve.
Parameters:
name | type | optional | description |
|---|---|---|---|
divisions | number | No | The amount of divisions used by this curve. |
Returns: number - The resolution of the curve.
Source: src/curves/CubicBezierCurve.js#L103
Since: 3.0.0
getSpacedPoints
<instance> getSpacedPoints([divisions], [stepRate], [out])
Description:
Get a sequence of equally spaced points (by arc distance) from the curve.
1 + divisions points will be returned.
Parameters:
name | type | optional | default | description |
|---|---|---|---|---|
divisions | number | Yes | "this.defaultDivisions" | The number of divisions to make. |
stepRate | number | Yes | Step between points. Used to calculate the number of points to return when divisions is falsy. Ignored if divisions is positive. | |
out | array | Array.<Phaser.Math.Vector2> | Yes | An optional array to store the points in. |
Returns: Array.<Phaser.Math.Vector2> - An array of points.
Inherits: Phaser.Curves.Curve#getSpacedPoints
Source: src/curves/Curve.js#L370
Since: 3.0.0
getStartPoint
<instance> getStartPoint([out])
Description:
Gets the starting point on the curve.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
out | Yes | A Vector2 object to store the result in. If not given will be created. |
Overrides: Phaser.Curves.Curve#getStartPoint
Returns: Phaser.Math.Vector2 - The coordinates of the point on the curve. If an out object was given this will be returned.
Source: src/curves/CubicBezierCurve.js#L84
Since: 3.0.0
getTangent
<instance> getTangent(t, [out])
Description:
Get a unit vector tangent at a relative position on the curve. In case any sub curve does not implement its tangent derivation, 2 points a small delta apart will be used to find its gradient which seems to give a reasonable approximation
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
t | number | No | The relative position on the curve, [0..1]. |
out | Yes | A vector to store the result in. |
Returns: Phaser.Math.Vector2 - Vector approximating the tangent line at the point t (delta +/- 0.0001)
Inherits: Phaser.Curves.Curve#getTangent
Source: src/curves/Curve.js#L430
Since: 3.0.0
getTangentAt
<instance> getTangentAt(u, [out])
Description:
Get a unit vector tangent at a relative position on the curve, by arc length.
Tags:
- generic
Parameters:
name | type | optional | description |
|---|---|---|---|
u | number | No | The relative position on the curve, [0..1]. |
out | Yes | A vector to store the result in. |
Returns: Phaser.Math.Vector2 - The tangent vector.
Inherits: Phaser.Curves.Curve#getTangentAt
Source: src/curves/Curve.js#L472
Since: 3.0.0
getTFromDistance
<instance> getTFromDistance(distance, [divisions])
Description:
Given a distance in pixels, get a t to find p.
Parameters:
name | type | optional | description |
|---|---|---|---|
distance | number | No | The distance, in pixels. |
divisions | number | Yes | Optional amount of divisions. |
Returns: number - The distance.
Inherits: Phaser.Curves.Curve#getTFromDistance
Source: src/curves/Curve.js#L492
Since: 3.0.0
getUtoTmapping
<instance> getUtoTmapping(u, distance, [divisions])
Description:
Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant.
Parameters:
name | type | optional | description |
|---|---|---|---|
u | number | No | A float between 0 and 1. |
distance | number | No | The distance, in pixels. |
divisions | number | Yes | Optional amount of divisions. |
Returns: number - The equidistant value.
Inherits: Phaser.Curves.Curve#getUtoTmapping
Source: src/curves/Curve.js#L513
Since: 3.0.0
toJSON
<instance> toJSON()
Description:
Returns a JSON object that describes this curve.
Returns: Phaser.Types.Curves.JSONCurve - The JSON object containing this curve data.
Source: src/curves/CubicBezierCurve.js#L176
Since: 3.0.0
updateArcLengths
<instance> updateArcLengths()
Description:
Calculate and cache the arc lengths.
Inherits: Phaser.Curves.Curve#updateArcLengths
Source: src/curves/Curve.js#L594
Since: 3.0.0