ch.aplu.android

Class GGCircle

java.lang.Object

ch.aplu.android.GGCircle

public class GGCircle
extends java.lang.Object

Class representing a circle in the x-y-plane with a center vector and a radius (all doubles).

Field Summary

Fields

Modifier and Type	Field and Description
GGVector	center The public vector to the center of the circle.
double	radius The public radius of the circle.

Constructor Summary

Constructors

Constructor and Description
GGCircle() Constructs a circle at (0, 0) with radius = 0.
GGCircle(double radius) Constructs a circle at (0, 0) with given radius.
GGCircle(GGCircle circle) Constructs a new circle with the same center and radius as the given circle.
GGCircle(GGVector center, double radius) Constructs a circle with given center and radius.

Method Summary

Methods

Modifier and Type	Method and Description
GGCircle	clone() Returns a new circle with the same center and radius as the current circle.
GGVector	getCenter() Returns a copy of the center of the circle.
double	getRadius() Returns the radius of the circle.
boolean	isEqual(GGCircle circle) Returns true, if the current circle is identical to the given circle.
boolean	isIntersecting(GGCircle circle) Returns true if the current circle intersects with the given circle.
boolean	isIntersecting(GGRectangle rect) Returns true if the current circle intersects with the given rectangle.
boolean	isIntersecting(GGVector vector) Returns true if the given points is part of the circle area.
boolean	isIntersecting(GGVector imageCenter, double imageDirection, android.graphics.Bitmap image, boolean isRotatable) Returns true, if area of the current circle intersects the non-transparant area of the given image.
boolean	isIntersecting(android.graphics.Rect rect) Returns true if the current circle intersects with the given android.graphics.Rect.
java.lang.String	toString() Returns a string that enumerates center and radius.
void	translate(GGVector v) Performs a translation by the given vector.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

center

public GGVector center

The public vector to the center of the circle.

radius

public double radius

The public radius of the circle.

Constructor Detail

GGCircle

public GGCircle(GGVector center,
        double radius)

Constructs a circle with given center and radius.

Parameters:

center - the vector to the center

radius - the radius of the circle

GGCircle

public GGCircle(double radius)

Constructs a circle at (0, 0) with given radius.

Parameters:

radius - the radius of the circle

GGCircle

public GGCircle()

Constructs a circle at (0, 0) with radius = 0.

GGCircle

public GGCircle(GGCircle circle)

Constructs a new circle with the same center and radius as the given circle.

Parameters:

circle - the circle from where center and radius are copied.

Method Detail

getRadius

public double getRadius()

Returns the radius of the circle.

Returns:

the radius of the circle

getCenter

public GGVector getCenter()

Returns a copy of the center of the circle.

Returns:

a clone of the center of the circle

clone

public GGCircle clone()

Returns a new circle with the same center and radius as the current circle.

Overrides:

clone in class java.lang.Object

translate

public void translate(GGVector v)

Performs a translation by the given vector.

Parameters:

v - the translation vector

isIntersecting

public boolean isIntersecting(GGCircle circle)

Returns true if the current circle intersects with the given circle.

Parameters:

circle - the circle to be checked for intersection with the current circle

Returns:

true, if the two circles intersects; otherwise false

isIntersecting

public boolean isIntersecting(GGRectangle rect)

Returns true if the current circle intersects with the given rectangle.

Parameters:

rect - the rectangle to be checked for intersection with the current circle

Returns:

true, if the two figures intersects; otherwise false

isIntersecting

public boolean isIntersecting(android.graphics.Rect rect)

Returns true if the current circle intersects with the given android.graphics.Rect.

Parameters:

rect - the rectangle to be checked for intersection with the current circle

Returns:

true, if the two figures intersects; otherwise false

isIntersecting

public boolean isIntersecting(GGVector vector)

Returns true if the given points is part of the circle area.

Parameters:

vector - the vector to be checked for intersection

Returns:

true, if the vector (end point) lays inside or on the border of the circle; otherwise false

isIntersecting

public boolean isIntersecting(GGVector imageCenter,
                     double imageDirection,
                     android.graphics.Bitmap image,
                     boolean isRotatable)

Returns true, if area of the current circle intersects the non-transparant area of the given image.

Parameters:

imageCenter - the vector to the center of the image

imageDirection - the direction of the image (angle of edge ulx --> uly with respect to the positive x-direction (0..2*pi))

image - the image bitmap

isRotatable - if true, the imageDirection is considered; otherwise imageDirection = 0 is assumed

toString

public java.lang.String toString()

Returns a string that enumerates center and radius.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the circle

isEqual

public boolean isEqual(GGCircle circle)

Returns true, if the current circle is identical to the given circle.

Parameters:

circle - the cirle to compare

Returns:

true, if both circles are identical