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Fix the name of the trig function approximation in geopoly. No functional

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changes to the code.

FossilOrigin-Name: 33576b12b450a37b467ba012e77b297eb80d7147b12a5b23302009bb32455720
This commit is contained in:
drh
2018-11-29 12:00:02 +00:00
parent 4d2f81eb73
commit f7c44f9bd2
3 changed files with 12 additions and 12 deletions
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10
ext/rtree/geopoly.c
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@ -544,15 +544,15 @@ static void geopolyCcwFunc(
#define GEOPOLY_PI 3.1415926535897932385
/* Fast approximation for cosine(X) for X between -0.5*pi and 2*pi
/* Fast approximation for sine(X) for X between -0.5*pi and 2*pi
*/
static double geopolyCosine(double r){
static double geopolySine(double r){
assert( r>=-0.5*GEOPOLY_PI && r<=2.0*GEOPOLY_PI );
if( r>=1.5*GEOPOLY_PI ){
r -= 2.0*GEOPOLY_PI;
}
if( r>=0.5*GEOPOLY_PI ){
return -geopolyCosine(r-GEOPOLY_PI);
return -geopolySine(r-GEOPOLY_PI);
}else{
double r2 = r*r;
double r3 = r2*r;
@ -593,8 +593,8 @@ static void geopolyRegularFunc(
p->hdr[3] = n&0xff;
for(i=0; i<n; i++){
double rAngle = 2.0*GEOPOLY_PI*i/n;
p->a[i*2] = x - r*geopolyCosine(rAngle-0.5*GEOPOLY_PI);
p->a[i*2+1] = y + r*geopolyCosine(rAngle);
p->a[i*2] = x - r*geopolySine(rAngle-0.5*GEOPOLY_PI);
p->a[i*2+1] = y + r*geopolySine(rAngle);
}
sqlite3_result_blob(context, p->hdr, 4+8*n, SQLITE_TRANSIENT);
sqlite3_free(p);