Class Triangle

constructor

• new Triangle(a, b, c): Triangle

• The constructor.

  Parameters

  • a: Vertex

    The first vertex of the triangle.
  • b: Vertex

    The second vertex of the triangle.
  • c: Vertex

    The third vertex of the triangle.

  Returns Triangle

  Name

  Triangle

a

b

c

Readonly className

isDestroyed

Readonly uid

bounds

• bounds(): Bounds

• Get the rectangular bounds for this triangle.

  Returns Bounds

  • The min/max bounds of this triangle.

  Method

  bounds

  Instance

  Memberof

  Triangle

calcCircumcircle

• calcCircumcircle(): void

• Re-compute the circumcircle of this triangle (if the vertices have changed).

  The circumcenter and radius are stored in this.center and this.radius. There is a third result: radius_squared (for internal computations).

  Returns void

  void

  Method

  calcCircumcircle

  Instance

  Memberof

  Triangle

containsPoint

• containsPoint(p): boolean

• Checks if the passed vertex (p) is inside this triangle.

  Note: matrix determinants rock.

  Parameters

  • p: Vertex

    The vertex to check.

  Returns boolean

  Method

  containsPoint

  Instance

  Memberof

  Triangle

destroy

• destroy(): void

• This function should invalidate any installed listeners and invalidate this object. After calling this function the object might not hold valid data any more and should not be used.

  Returns void

determinant

• determinant(): number

• Get the determinant of this triangle.

  Returns number

  • The determinant (float).

  Method

  determinant

  Instance

  Memberof

  Triangle

getArea

• getArea(): number

• Get the area of this triangle. The returned area is never negative.

  If you are interested in the signed area, please consider using the Triangle.utils.signedArea helper function. This method just returns the absolute value of the signed area.

  Returns number

  The non-negative area of this triangle.

  Method

  getArea

  Instance

  Memberof

  Triangle

getCentroid

• getCentroid(): Vertex

• Get the centroid of this triangle.

  The centroid is the average midpoint for each side.

  Returns Vertex

  The centroid

  Method

  getCentroid

  Instance

  Memberof

  Triangle

getCircumcircle

• getCircumcircle(): Circle

• Get the circumcircle of this triangle.

  The circumcircle is that unique circle on which all three vertices of this triangle are located on.

  Please note that for performance reasons any changes to vertices will not reflect in changes of the circumcircle (center or radius). Please call the calcCirumcircle() function after triangle vertex changes.

  Returns Circle

  • { center:Vertex, radius:float }

  Method

  getCircumcircle

  Instance

  Memberof

  Triangle

getIncenter

• getIncenter(): Vertex

• Get the incenter of this triangle (which is the center of the circumcircle).

  Note: due to performance reasonst the incenter is buffered inside the triangle because computing it is relatively expensive. If a, b or c have changed you should call the calcCircumcircle() function first, otherwise you might get wrong results.

  Returns Vertex

  Vertex The incenter of this triangle.

getIncircle

• getIncircle(): Circle

• Get the incircle of this triangle. That is the circle that touches each side of this triangle in exactly one point.

  Note this just calls getIncircularTriangle().getCircumcircle()

  Returns Circle

  The incircle of this triangle.

getIncircularTriangle

• getIncircularTriangle(): Triangle

• Get that inner triangle which defines the maximal incircle.

  Returns Triangle

  The triangle of those points in this triangle that define the incircle.

getThirdVertex

• getThirdVertex(vert1, vert2): Vertex

• Get that vertex of this triangle (a,b,c) that is not vert1 nor vert2 of the passed two.

  Parameters

  • vert1: Vertex

    The first vertex.
  • vert2: Vertex

    The second vertex.

  Returns Vertex

  • The third vertex of this triangle that makes up the whole triangle with vert1 and vert2.

  Method

  getThirdVertex

  Instance

  Memberof

  Triangle

inCircumcircle

• inCircumcircle(v): boolean

• Check if the passed vertex is inside this triangle's circumcircle.

  Parameters

  • v: Vertex

    The vertex to check.

  Returns boolean

  Method

  inCircumcircle

  Instance

  Memberof

  Triangle

isAdjacent

• isAdjacent(tri): boolean

• Check if this triangle and the passed triangle share an adjacent edge.

  For edge-checking Vertex.equals is used which uses an an epsilon for comparison.

  Parameters

  • tri: Triangle

    The second triangle to check adjacency with.

  Returns boolean

  • True if this and the passed triangle have at least one common edge.

  Method

  isAdjacent

  Instance

  Memberof

  Triangle

scaleToCentroid

• scaleToCentroid(factor): Triangle

• Scale the triangle towards its centroid.

  Parameters

  • factor: number

  Returns Triangle

  this (for chaining)

  Method

  scaleToCentroid

  Instance

  Memberof

  Triangle

toPolygon

• toPolygon(): Polygon

• Convert this triangle to a polygon instance.

  Plase note that this conversion does not perform a deep clone.

  Returns Polygon

  A new polygon representing this triangle.

  Method

  toPolygon

  Instance

  Memberof

  Triangle

toString

• toString(): string

• Converts this triangle into a human-readable string.

  Returns string

  Method

  toString

  Instance

  Memberof

  Triangle

Static fromArray

• fromArray(arr): Triangle

• Create a new triangle from the given array of vertices.

  The array must have at least three vertices, otherwise an error will be raised. This function will not create copies of the vertices.

  Parameters

  • arr: Vertex[]

    The required array with at least three vertices.

  Returns Triangle

  Method

  fromArray

  Static

  Memberof

  Vertex