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Add FEET_PER_MILE macro and use it throughout

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The macro replaces uses of the float value 5280.0 (being the
number of feet in a mile).

This improves readability, particularly for readers from metric
backgrounds.
This commit is contained in:
albert
2017-08-24 13:06:50 +02:00
parent 01b1cbe624
commit 3059e1a6a6
4 changed files with 21 additions and 20 deletions
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10
outputs.cc
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@@ -1335,7 +1335,7 @@ void PathReport(struct site source, struct site destination, char *name,
azimuth = rint(Azimuth(source, destination));
for (y = 2; y < (path.length - 1); y++) { /* path.length-1 avoids LR error */
distance = 5280.0 * path.distance[y];
distance = FEET_PER_MILE * path.distance[y];
source_alt = four_thirds_earth + source.alt + path.elevation[0];
dest_alt = four_thirds_earth + destination.alt +
@@ -1357,7 +1357,7 @@ void PathReport(struct site source, struct site destination, char *name,
for (x = 2, block = 0; x < y && block == 0; x++) {
distance =
5280.0 * (path.distance[y] -
FEET_PER_MILE * (path.distance[y] -
path.distance[x]);
test_alt =
four_thirds_earth +
@@ -1769,7 +1769,7 @@ void SeriesData(struct site source, struct site destination, char *name,
if (fresnel_plot) {
lambda = 9.8425e8 / (LR.frq_mhz * 1e6);
d = 5280.0 * path.distance[path.length - 1];
d = FEET_PER_MILE * path.distance[path.length - 1];
}
if (normalised) {
@@ -1812,7 +1812,7 @@ void SeriesData(struct site source, struct site destination, char *name,
terrain += destination.alt; /* RX antenna spike */
a = terrain + earthradius;
cangle = 5280.0 * Distance(destination, remote) / earthradius;
cangle = FEET_PER_MILE * Distance(destination, remote) / earthradius;
c = b * sin(refangle * DEG2RAD + HALFPI) / sin(HALFPI -
refangle *
DEG2RAD -
@@ -1830,7 +1830,7 @@ void SeriesData(struct site source, struct site destination, char *name,
if ((LR.frq_mhz >= 20.0) && (LR.frq_mhz <= 100000.0)
&& fresnel_plot) {
d1 = 5280.0 * path.distance[x];
d1 = FEET_PER_MILE * path.distance[x];
f_zone = -1.0 * sqrt(lambda * d1 * (d - d1) / d);
fpt6_zone = f_zone * fzone_clearance;
}