Package net.algart.math.geometry

Class IntegerCirclePointsGenerator

java.lang.Object

net.algart.math.geometry.IntegerCirclePointsGenerator

public class IntegerCirclePointsGenerator
extends Object

Service class that quickly returns all integer points of Bresenham circles with integer radii. Uses cache for optimization (don't calculate points of not too large circles twice).

Author:

Daniel Alievsky

Method Summary

Modifier and Type	Method	Description
void	dispose()	Frees all cache memory.
int[]	getCirclePoints(int r)	Returns all integer points of the circle with given radius r and center at (0,0).
int[]	getExternalCirclePoints(int r, int delta)	Analog of getCirclePoints(int) method, but returned points are shifted by delta pixels from (0,0).
static IntegerCirclePointsGenerator	getInstance()

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static IntegerCirclePointsGenerator getInstance()

getCirclePoints

public int[] getCirclePoints(int r)

Returns all integer points of the circle with given radius r and center at (0,0). Points are calculated by Bresenham algorithm. Result array consists of (x,y) pairs: [0] element is x0, [1] element is y0, [2] element is x1, [3] element is y1, ... The number of returned points if (result_array).length/2. In a special case r==0, returns {0,0}.

Warning: the result array must not be modified!

getExternalCirclePoints

public int[] getExternalCirclePoints(int r,
 int delta)

Analog of getCirclePoints(int) method, but returned points are shifted by delta pixels from (0,0). The number of returned points is the same as in getCirclePoints method with the same r. In a special case r==0, returns {0,0}.

Warning: the result array must not be modified!

dispose

public void dispose()

Frees all cache memory. Recommended when ceasing using this class for a long time. System.gc() may be called after this to real freeing memory.