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# if Vi is within

By Jessica Long,2014-11-01 17:48
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if Vi is within

if Vi is within tol from Vstart

then ignore it, and continue with the next vertex

Vi is further than tol away from Vstart so add it as a new vertex of the reduced polyline Increment k++;

Set Wk = Vi;

Set start = i; as the new initial vertex }

Output: W = {W0,W1,...,Wk-1} = the k-vertex simplified polyline

*/

/********************

* *

* ???ä *

* *

********************/

Á?Ô??ØÏµ?º

/* Á?Ô??º

ÏàÀë?º return 1??

ÍâÇÐ?º return 2??

Ïà???º return 3??

ÄÚÇÐ?º return 4??

ÄÚº??º return 5??

*/

int CircleRelation(POINT p1, double r1, POINT p2, double r2)

{

double d = sqrt( (p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y) );

if( fabs(d-r1-r2) < EP ) // ?ØÐë??Ö?Ç?Á??öifÏÈ??ÅÐ???? return 2;

if( fabs(d-fabs(r1-r2)) < EP )

return 4;

if( d > r1+r2 )

return 1;

if( d < fabs(r1-r2) )

return 5;

if( fabs(r1-r2) < d && d < r1+r2 ) return 3;

return 0; // indicate an error! }

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