GoJS API
/ to search
    Preparing search index...

    Class Point

    A Point represents an x- and y-coordinate pair in two-dimensional space.

    Use the static functions Point.parse and Point.stringify to convert to and from a standard string representation that is independent of the current locale.

    When an instance of this class is the value of a property of a GraphObject class or Diagram or CommandHandler or a Tool class, you should treat the object as if it were frozen or read-only -- you cannot modify its properties. This allows the property to return a value without allocating a new instance. If you need to do your own calculations with the value, call copy to make a new instance with the same values that you can modify.

    Many methods modify the object's properties and then return a reference to "this" object. The only instance method to allocate a new object is the copy method. The static Point.parse method also allocates a new object.

    The "Debug" implementation of this class is significantly slower than the "Release" implementation, mostly due to additional error checking.

    You cannot inherit from this class.

    Index

    Constructors

    • The default constructor produces the Point(0,0). This constructor may take either zero arguments or two arguments.

      Parameters

      • Optionalx: number

        The x value.

      • Optionaly: number

        The y value.

      Returns Point

    Accessors

    • get x(): number

      Gets or sets the x value of the Point.

      Returns number

    • get y(): number

      Gets or sets the y value of the Point.

      Returns number

    Methods

    • Modify this point so that is the sum of the current Point and the x and y co-ordinates of the given Point.

      Parameters

      • p: Point

        The Point to add to this Point.

      Returns this

      this.

    • Compare this point with a finite line segment given by two Points.

      This method compares this point with a finite line segment determined by the given two Points. If the point is on the finite line segment, this returns zero. If the point is on the left side of the segment, this returns a positive number. If the point is on the right side of the segment, this returns a negative number. If the point is on the infinitely extended line but not within the segment, then this returns a positive number if the point is beyond the end of the segment when going from A1 to A2, or this returns a negative number if the point comes before the segment's start at A1.

      Parameters

      • p: Point

        the start of the finite line segment

      • q: Point

        the end of the finite line segment

      Returns number

      <0 if this Point is on the right side of the line segment, or >0 if this Point is on the left side, or zero if exactly on the finite line segment

      since

      2.2

    • Create a copy of this Point, with the same values.

      Returns Point

    • Compute the angle from this Point to a given (px,py) point. However, if the point is the same as this Point, the direction is zero.

      Parameters

      • px: number
      • py: number

      Returns number

      the angle, in degrees, of the line from this Point to the given point.

    • Compute the angle from this Point to a given Point. However, if the given Point is the same as this Point, the direction is zero.

      Parameters

      • p: Point

        the other Point to which to measure the relative angle.

      Returns number

      the angle, in degrees, of the line from this Point to the given point.

    • Returns the square of the distance from this point to a given point (px, py).

      Parameters

      • px: number
      • py: number

      Returns number

      the square of the euclidean distance.

    • Returns the square of the distance from this Point to a given Point.

      Parameters

      • p: Point

        the other Point to measure to.

      Returns number

      the square of the euclidean distance.

    • Indicates whether the given Point is equal to this Point.

      Parameters

      • p: Point

        The Point to compare to the current Point.

      Returns boolean

      True if the two Points have identical X and Y values, false otherwise.

    • Indicates whether the given point (x, y) is equal to this Point.

      Parameters

      • x: number
      • y: number

      Returns boolean

      True if the two Points have identical X and Y values, false otherwise.

      see

      equals

    • True if this Point has X and Y values that are real numbers and not infinity.

      Returns boolean

    • Modify this Point so that its X and Y values have been normalized to a unit length. However, if this Point is the origin (zero, zero), its length remains zero.

      Returns this

      this.

    • Modify this point by shifting its values with the given DX and DY offsets.

      Parameters

      • dx: number
      • dy: number

      Returns this

      this.

    • Modify this point to be the closest point to this point that is on a finite line segment.

      Parameters

      • px: number

        one end of the finite line segment

      • py: number

        one end of the finite line segment

      • qx: number

        the other end of the finite line segment

      • qy: number

        the other end of the finite line segment

      Returns this

      this modified Point

    • Modify this point to be the closest point to this point that is on a finite line segment.

      Parameters

      • p: Point

        one end of the finite line segment

      • q: Point

        the other end of the finite line segment

      Returns this

      this modified Point

    • Modify this Point so that has been rotated about the origin by the given angle.

      Parameters

      • angle: number

        an angle in degrees.

      Returns this

      this.

    • Modify this Point so that its X and Y values have been scaled by given factors along the X and Y axes.

      Parameters

      • sx: number
      • sy: number

      Returns this

      this.

    • Modify this Point so that its X and Y values are the same as the given Point.

      Parameters

      • p: Point

        the given Point.

      Returns this

      this.

    • Modify this Point so that its X and Y values correspond to a particular Spot in a given Rect.

      The result is meaningless if Spot.isNoSpot is true for the given Spot.

      Parameters

      • r: Rect

        the Rect for which we are finding the point.

      • spot: Spot

        the Spot; Spot.isSpot must be true for this Spot.

      Returns this

      this.

    • Modify this Point so that its X and Y values correspond to a particular Spot in a given rectangle.

      The result is meaningless if Spot.isNoSpot is true for the given Spot.

      Parameters

      • x: number

        The X coordinate of the Rect for which we are finding the point.

      • y: number

        The Y coordinate of the Rect for which we are finding the point.

      • w: number

        The Width of the Rect for which we are finding the point.

      • h: number

        The Height of the Rect for which we are finding the point.

      • spot: Spot

        the Spot; Spot.isSpot must be true for this Spot.

      Returns this

      this the point of the spot in the rectangle.

    • Modify this Point with new X and Y values.

      Parameters

      • x: number
      • y: number

      Returns this

      this.

    • Modify this point to be at the nearest point on an infinite grid, given the grid's origin and size of each grid cell.

      Parameters

      • originX: number

        the top-left point of one of the grid cells

      • originY: number

        the top-left point of one of the grid cells

      • cellwidth: number

        the size of each grid cell -- must be a real number larger than zero

      • cellheight: number

        the size of each grid cell -- must be a real number larger than zero

      Returns this

      this modified Point

    • Modify this point to be at the nearest point on an infinite grid, given the grid's origin and size of each grid cell.

      Parameters

      • origin: Point

        the top-left point of one of the grid cells

      • cellsize: Size

        the size of each grid cell

      Returns this

      this modified Point

    • Modify this point so that is the difference of this Point and the x and y co-ordinates of the given Point.

      Parameters

      • p: Point

        The Point to subtract from the current Point.

      Returns this

      this.

      see
    • This static function compares a point with a finite line segment.

      If the point is on the finite line segment, this returns zero. If the point is on the left side of the segment, this returns a positive number. If the point is on the right side of the segment, this returns a negative number. If the point is on the infinitely extended line but not within the segment, then this returns a positive number if the point is beyond the end of the segment when going from A1 to A2, or this returns a negative number if the point comes before the segment's start at A1.

      Parameters

      • a1x: number
      • a1y: number
      • a2x: number
      • a2y: number
      • px: number
      • py: number

      Returns number

      <0 if on the right side, or >0 if on the left side, or zero if exactly on the finite line segment

      since

      2.2

    • This static function returns the angle in degrees of the line from point P to point Q.

      Parameters

      • px: number
      • py: number
      • qx: number
      • qy: number

      Returns number

    • This static function returns the square of the distance from the point P to the finite line segment from point A to point B.

      Parameters

      • px: number
      • py: number
      • ax: number
      • ay: number
      • bx: number
      • by: number

      Returns number

      the euclidean distance.

    • This static function returns the square of the distance from the point P to the point Q.

      Parameters

      • px: number
      • py: number
      • qx: number
      • qy: number

      Returns number

    • This static function is true if two finite straight line segments intersect each other.

      Parameters

      • a1x: number
      • a1y: number
      • a2x: number
      • a2y: number
      • b1x: number
      • b1y: number
      • b2x: number
      • b2y: number

      Returns boolean

      True if the two given finite line segments intersect with each other, false otherwise.

      since

      2.2

    • This static function can be used to read in a Point from a string that was produced by Point.stringify.

      go.Point.parse("1 2") produces the Point new go.Point(1, 2).

      Parameters

      • str: string

      Returns Point

    • This static function can be used to write out a Point as a string that can be read by Point.parse.

      go.Point.stringify(new go.Point(1, 2)) produces the string "1 2".

      Parameters

      Returns string

    • This static function returns a function that can be used as a back converter for a Binding to write out a Point's values as numbers with a fixed number of digits after the decimal point.

      This is useful for limiting the size of JSON output and making it more legible. It might also be useful for regression testing.

      Example:

        new go.Binding("location", "loc", go.Point.parse, go.Point.stringifyFixed(2))
      

      Parameters

      • digits: number

        must be a non-negative integer

      Returns (val: Point) => string

      a function that converts a Point to a string without so many decimals

      since

      3.0