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Set scale to be 5 for bc lat/lon converisons

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This commit is contained in:
Miles Alan 2020-06-27 17:59:50 -05:00
parent 00e09e6897
commit 6cbd8670c5
1 changed files with 12 additions and 8 deletions
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20
scripts/core/sxmo_gpsutil.sh
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@ -11,6 +11,7 @@ CPI=3.14159265358979323846
lat2px() { lat2px() {
DEGREES="$1"; ZOOM="$2" DEGREES="$1"; ZOOM="$2"
echo " echo "
scale=5;
define atanh(x) { return((l(1 + x) - l(1 - x))/2) }; define atanh(x) { return((l(1 + x) - l(1 - x))/2) };
-( \ -( \
atanh(s(($DEGREES * $CPI / 180))) * \ atanh(s(($DEGREES * $CPI / 180))) * \
@ -21,15 +22,17 @@ lat2px() {
lon2px() { lon2px() {
DEGREES="$1"; ZOOM="$2" DEGREES="$1"; ZOOM="$2"
echo " echo "
( \ scale=5;
($DEGREES * $CPI / 180) * $CTILESIZE * \ ( \
e($ZOOM * $CLN2) / (2 * $CPI) \ ($DEGREES * $CPI / 180) * $CTILESIZE * \
) + (e($ZOOM * $CLN2) * ($CTILESIZE / 2)) e($ZOOM * $CLN2) / (2 * $CPI) \
) + (e($ZOOM * $CLN2) * ($CTILESIZE / 2))
" | bc -l " | bc -l
} }
px2lat() { px2lat() {
PX="$1"; ZOOM="$2" PX="$1"; ZOOM="$2"
echo " echo "
scale=5;
define asin(x) { define asin(x) {
if(x==1) return($CPI/2); if(x==-1) return(-$CPI/2); return(a(x/sqrt(1-(x^2)))); if(x==1) return($CPI/2); if(x==-1) return(-$CPI/2); return(a(x/sqrt(1-(x^2))));
} }
@ -43,10 +46,11 @@ px2lat() {
px2lon() { px2lon() {
PX="$1"; ZOOM="$2" PX="$1"; ZOOM="$2"
echo " echo "
( \ scale=5;
($PX - (e($ZOOM * $CLN2) * ($CTILESIZE / 2))) * 2 * $CPI / \ ( \
($CTILESIZE * e($ZOOM * $CLN2)) \ ($PX - (e($ZOOM * $CLN2) * ($CTILESIZE / 2))) * 2 * $CPI / \
) / $CPI * 180 ($CTILESIZE * e($ZOOM * $CLN2)) \
) / $CPI * 180
" | bc -l " | bc -l
} }