org.newdawn.slick.geom
Class Circle

java.lang.Object
  org.newdawn.slick.geom.Shape
      org.newdawn.slick.geom.Ellipse
          org.newdawn.slick.geom.Circle

All Implemented Interfaces:

java.io.Serializable

public class Circle
extends Ellipse

A simple Circle geometry

Author:

Kevin Glass

See Also:

Serialized Form

Field Summary

float

radius The radius of the circle

Fields inherited from class org.newdawn.slick.geom.Ellipse

DEFAULT_SEGMENT_COUNT

Fields inherited from class org.newdawn.slick.geom.Shape

boundingCircleRadius, center, maxX, maxY, minX, minY, points, pointsDirty, trianglesDirty, tris, x, y

Constructor Summary

Circle(float centerPointX, float centerPointY, float radius)
Create a new circle based on its radius

Circle(float centerPointX, float centerPointY, float radius, int segmentCount)
Create a new circle based on its radius

Method Summary

protected void	calculateRadius() Calculate the radius of a circle that can completely enclose this shape.
boolean	contains(float x, float y) Check if a point is contained by this circle
protected void	findCenter() Get the center of this polygon.
float[]	getCenter() Get the coordinates of the center of the circle
float	getCenterX() Get the x coordinate of the centre of the circle
float	getCenterY() Get the y coordinate of the centre of the circle
float	getRadius() Get the radius of the circle
boolean	intersects(Shape shape) Check if this circle touches another
void	setRadius(float radius) Set the radius of this circle

Methods inherited from class org.newdawn.slick.geom.Ellipse

createPoints, getRadius1, getRadius2, setRadii, setRadius1, setRadius2, transform

Methods inherited from class org.newdawn.slick.geom.Shape

calculateTriangles, checkPoints, closed, contains, getBoundingCircleRadius, getHeight, getLocation, getMaxX, getMaxY, getMinX, getMinY, getNormal, getPoint, getPointCount, getPoints, getTriangles, getWidth, getX, getY, hasVertex, includes, increaseTriangulation, indexOf, preCache, prune, setCenterX, setCenterY, setLocation, setLocation, setX, setY, subtract, union

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

radius

public float radius

The radius of the circle

Constructor Detail

Circle

public Circle(float centerPointX,
              float centerPointY,
              float radius)

Create a new circle based on its radius

Parameters:

centerPointX - The x location of the center of the circle

centerPointY - The y location of the center of the circle

radius - The radius of the circle

Circle

public Circle(float centerPointX,
              float centerPointY,
              float radius,
              int segmentCount)

Create a new circle based on its radius

Parameters:

centerPointX - The x location of the center of the circle

centerPointY - The y location of the center of the circle

radius - The radius of the circle

segmentCount - The number of segments to build the circle out of

Method Detail

getCenterX

public float getCenterX()

Get the x coordinate of the centre of the circle

Overrides:

getCenterX in class Shape

Returns:

The x coordinate of the centre of the circle

getCenterY

public float getCenterY()

Get the y coordinate of the centre of the circle

Overrides:

getCenterY in class Shape

Returns:

The y coordinate of the centre of the circle

getCenter

public float[] getCenter()

Get the coordinates of the center of the circle

Overrides:

getCenter in class Shape

Returns:

2-element array with the center of the circle.

setRadius

public void setRadius(float radius)

Set the radius of this circle

Parameters:

radius - The radius of this circle

getRadius

public float getRadius()

Get the radius of the circle

Returns:

The radius of the circle

intersects

public boolean intersects(Shape shape)

Check if this circle touches another

Overrides:

intersects in class Shape

Parameters:

shape - The other circle

Returns:

True if they touch

contains

public boolean contains(float x,
                        float y)

Check if a point is contained by this circle

Overrides:

contains in class Shape

Parameters:

x - The x coordinate of the point to check

y - The y coorindate of the point to check

Returns:

True if the point is contained by this circle

findCenter

protected void findCenter()

Description copied from class: Shape

Get the center of this polygon.

Overrides:

findCenter in class Ellipse

See Also:

Ellipse.findCenter()

calculateRadius

protected void calculateRadius()

Description copied from class: Shape

Calculate the radius of a circle that can completely enclose this shape.

Overrides:

calculateRadius in class Ellipse

See Also:

Ellipse.calculateRadius()