ocmath_find_xy_in_circle

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include
9 Reference

Description

Find how many points in the circle and their indices

Syntax

int ocmath_find_xy_in_circle( uint nPts, const double * pX, const double * pY, uint * pIndices, const double xc, const double yc, const double dRadius )

Parameters

nPts: [input]the size of pX and pY
pX: [input]pointer to array containing the x-coordinate;
pY: [input]pointer to array containing the y-coordinate;
pIndices: [output] the indexs of the points which are in the circle
xc: [input] the x-coordinate of the circle center
yc: [input] the y-coordinate of the circle center
dRadius: [input] the radius of the circle

Return

Returns number of points found.

Examples

EX1

#include <wks2mat.h>

void ocmath_find_xy_in_circle_ex1()
{
        uint nPts = 5;
        double pX[] = {-3.0, -2.0, 0.0, 1.0, 1.0};
        double pY[] = {1.0, 0.0, 1.0, 1.0, 0.0};
        uint pIndices[5];
        int nRet = ocmath_find_xy_in_circle(nPts, pX, pY, pIndices, 0.0, 0.0, 2.0);
        out_int("nRet = ", nRet);
        out_str("The point in circle are:");
        for(int ii = 0; ii < nRet; ii++)
        {
                printf("Point #%d: (%f, %f)\n",pIndices[ii], pX[pIndices[ii]], pY[pIndices[ii]]);
        }
}