Module org.dyn4j

Class HalfEllipse

    • Field Detail

      • height

        final double height
        The ellipse height
      • halfWidth

        final double halfWidth
        The half-width
      • rotation

        final Rotation rotation
        The local rotation
      • ellipseCenter

        final Vector2 ellipseCenter
        The ellipse center
      • vertexLeft

        final Vector2 vertexLeft
        The first vertex of the bottom
      • vertexRight

        final Vector2 vertexRight
        The second vertex of the bottom
    • Constructor Detail

      • HalfEllipse

        public HalfEllipse​(double width,
                           double height)
        Minimal constructor.

        This creates an axis-aligned half ellipse fitting inside a rectangle of the given width and height.

        Parameters:
        width - the width
        height - the height of the half
        Throws:
        java.lang.IllegalArgumentException - if either the width or height is less than or equal to zero
    • Method Detail

      • getAxes

        public Vector2[] getAxes​(Vector2[] foci,
                                 Transform transform)
        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.

        This method is not supported by this shape.

        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[]
        Throws:
        java.lang.UnsupportedOperationException - when called
      • 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.

        This method is not supported by this shape.

        Specified by:
        getFoci in interface Convex
        Parameters:
        transform - the local to world space Transform of this Convex Shape
        Returns:
        Vector2[]
        Throws:
        java.lang.UnsupportedOperationException - when called
      • 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
      • getWidth

        public double getWidth()
        Returns the width.
        Returns:
        double
      • getHeight

        public double getHeight()
        Returns the height.
        Returns:
        double
      • getHalfWidth

        public double getHalfWidth()
        Returns the half width.
        Returns:
        double
      • getEllipseCenter

        public Vector2 getEllipseCenter()
        Returns the center of the ellipse.
        Returns:
        Vector2