Tasks

Initialization

• – initWithX:y:

  Initializes a point with its x and y components. Designated Initializer.

• – initWithPolarLength:angle:

  Initializes a point with the distance and angle in respect to the origin.

• + pointWithPolarLength:angle:

  Factory method.

• + pointWithX:y:

  Factory method.

• + point

  Factory method.

Methods

• – addPoint:

  Adds a point to the current point and returns the resulting point.

• – subtractPoint:

  Substracts a point from the current point and returns the resulting point.

• – scaleBy:

  Scales the point by a certain factor and returns the resulting point.

• – rotateBy:

  Rotates the point by the given angle (in radians, CCW) and returns the resulting point.

• – normalize

  Returns a point that has the same direction but a length of one.

• – invert

  Returns a point that is the inverse (negation) of this point.

• – perpendicular

  Returns a perpendicular vector.

• – truncateLength:

  Returns a point truncated to length.

• – dot:

  Returns the dot-product of self and the given point.

• – isEqualToPoint:

  Compares two points.

• – copyFromPoint:

  Copies the values from another point into the current point.

• – setX:y:

  Sets the members of the point to the specified values.

• – convertToGLKVector

  Creates a GLKit vector that is equivalent to this instance.

• + distanceFromPoint:toPoint:

  Calculates the distance between two points.

• + angleBetweenPoint:andPoint:

  Calculates the angle between two points.

• + interpolateFromPoint:toPoint:ratio:

  Determines a point between two specified points. ratio = 0 -> p1, ratio = 1 -> p2

Properties

•   x

  The x-Coordinate of the point.

  property
•   y

  The y-Coordinate of the point.

  property
•   length

  The distance to the origin (or the length of the vector).

  property
•   lengthSquared

  The squared distance to the origin (or the squared length of the vector)

  property
•   angle

  The angle between the positive x-axis and the point (in radians, CCW).

  property
•   isOrigin

  Returns true if this point is in the origin (x and y equal zero).

  property