Module org.dyn4j

Class Slice

    • Field Detail

      • alpha

        final double alpha
        Half the total circular section in radians
      • cosAlpha

        final double cosAlpha
        Cosine of half the total circular section in radians
      • sliceRadius

        final double sliceRadius
        The radius passed in at creation
      • vertices

        final Vector2[] vertices
        The vertices of the slice
      • normals

        final Vector2[] normals
        The normals of the polygonal sides
      • rotation

        final Rotation rotation
        The local rotation in radians
    • Constructor Detail

      • Slice

        public Slice​(double radius,
                     double theta)
        Full constructor.

        This method creates a slice of a circle with the circle center at the origin and half of theta below the x-axis and half above.

        Parameters:
        radius - the radius of the circular section
        theta - the angular extent in radians; must be greater than zero and less than or equal to π
        Throws:
        java.lang.IllegalArgumentException - throw if 1) radius is less than or equal to zero or 2) theta is less than or equal to zero or 3) theta is greater than 180 degrees
    • Method Detail

      • getAxes

        public Vector2[] getAxes​(Vector2[] foci,
                                 Transform transform)
        Description copied from interface: Convex
        Returns an array of separating axes to test for this Shape.

        The foci parameter is an array of circular focal points of the other Shape.

        If foci points are given, this method will return the separating axes for this Shape's voronoi regions also. The points in the foci array are assumed to be in world space.

        The returned axes are normalized and in world space.

        Specified by:
        getAxes in interface Convex
        Parameters:
        foci - the world space points representing foci of curved Shapes; can be null
        transform - the local to world space Transform of this Convex Shape
        Returns:
        Vector2[]
      • getFoci

        public Vector2[] getFoci​(Transform transform)
        Returns an array of world space foci points for circular curved edges.

        This method returns null if the Shape has zero curved edges.

        The returned points are in world space.

        Returns a single point, the circle center.

        Specified by:
        getFoci in interface Convex
        Parameters:
        transform - the local to world space Transform of this Convex Shape
        Returns:
        Vector2[]
      • getFarthestPoint

        public Vector2 getFarthestPoint​(Vector2 vector,
                                        Transform transform)
        Description copied from interface: Convex
        Returns the point farthest in the direction of the given vector. If two points are equally distant along the given Vector2 the first one is used.

        The returned point is in world space.

        Specified by:
        getFarthestPoint in interface Convex
        Parameters:
        vector - the direction
        transform - the local to world space Transform of this Convex Shape
        Returns:
        Vector2
      • createMass

        public Mass createMass​(double density)
        Description copied from interface: Shape
        Creates a Mass object using the geometric properties of this Shape and the given density.
        Specified by:
        createMass in interface Shape
        Parameters:
        density - the density in kg/m2
        Returns:
        Mass the Mass of this Shape
      • getRadius

        public double getRadius​(Vector2 center)
        Description copied from interface: Shape
        Returns the radius of the shape if the given point was the center for this shape.
        Specified by:
        getRadius in interface Shape
        Parameters:
        center - the center point
        Returns:
        double
      • contains

        public boolean contains​(Vector2 point,
                                Transform transform)
        Description copied from interface: Shape
        Returns true if the given point is inside this Shape.

        If the given point lies on an edge the point is considered to be inside the Shape.

        The given point is assumed to be in world space.

        Specified by:
        contains in interface Shape
        Parameters:
        point - world space point
        transform - Transform for this Shape
        Returns:
        boolean
      • rotate

        public void rotate​(Rotation rotation,
                           double x,
                           double y)
        Description copied from interface: Rotatable
        Rotates the object about the given point.
        Specified by:
        rotate in interface Rotatable
        Overrides:
        rotate in class AbstractShape
        Parameters:
        rotation - the Rotation representing the rotation amount
        x - the x coordinate to rotate about
        y - the y coordinate to rotate about
      • translate

        public void translate​(double x,
                              double y)
        Description copied from interface: Translatable
        Translates the object the given amounts in the respective directions.
        Specified by:
        translate in interface Translatable
        Overrides:
        translate in class AbstractShape
        Parameters:
        x - the translation in the x direction
        y - the translation in the y direction
      • getRotationAngle

        public double getRotationAngle()
        Returns the rotation about the local center in radians.
        Returns:
        double the rotation in radians
      • getRotation

        public Rotation getRotation()
        Returns:
        the Rotation object that represents the local rotation
      • getTheta

        public double getTheta()
        Returns the angular extent of the slice in radians.
        Returns:
        double
      • getSliceRadius

        public double getSliceRadius()
        Returns the slice radius.

        This is the radius passed in at creation.

        Returns:
        double
      • getCircleCenter

        public Vector2 getCircleCenter()
        Returns the tip of the pie shape.

        This is the center of the circle.

        Returns:
        Vector2