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Fix true wind computation bug, add swipe gesture to pause GPS

pull/1770/head
marko 2022-04-28 17:57:39 -04:00
parent a8392e34f5
commit 1dbcbd47f8
4 changed files with 53 additions and 26 deletions
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1
apps/openwind/ChangeLog
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@ -1 +1,2 @@
0.01: New App!
0.02: Fix true wind computation, add swipe gesture to pause GPS

4
apps/openwind/README.md
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@ -14,7 +14,9 @@ additionally displayed in red. In this mode, the speed over ground in knots is
## Controls
There are no controls in the main app, but there are two settings in the settings app that can be changed:
In the main app, when true wind mode is enabled (see below), swiping left on the screen will temporarily disable GPS (to preserve battery); a small
red satellite symbol will appear on the bottom right. Swiping right will turn GPS back on.
The settings app provides the following two settings:
* True wind: enables or disables true wind calculations; enabling this will turn on GPS inside the app
* Mounting angle: mounting relative to the boat of the wind instrument (in degrees)

70
apps/openwind/app.js
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@ -1,16 +1,20 @@
OW_CHAR_UUID = '0000cc91-0000-1000-8000-00805f9b34fb';
require("Font7x11Numeric7Seg").add(Graphics);
gatt = {};
cx = g.getWidth()/2;
cy = 24+(g.getHeight()-24)/2;
w = (g.getWidth()-24)/2;
gps_course = { spd: 0 };
var gatt = {};
var cx = g.getWidth()/2;
var cy = 24+(g.getHeight()-24)/2;
var w = (g.getWidth()-24)/2;
var y1 = 24;
var y2 = g.getHeight()-1;
var gps_course = { spd: 0 };
var course_marker_len = g.getWidth()/4;
var settings = require("Storage").readJSON('openwindsettings.json', 1) || {};
i = 0;
hullpoly = [];
var pause_gps = false;
var i = 0;
var hullpoly = [];
for (y=-1; y<=1; y+=0.1) {
hullpoly[i++] = cx - (y<0 ? 1+y*0.15 : (Math.sqrt(1-0.7*y*y)-Math.sqrt(0.3))/(1-Math.sqrt(0.3)))*w*0.3;
hullpoly[i++] = cy - y*w*0.7;
@ -22,17 +26,18 @@ for (y=1; y>=-1; y-=0.1) {
function wind_updated(ev) {
if (ev.target.uuid == "0xcc91") {
awa = settings.mount_angle-ev.target.value.getInt16(1, true)*0.1;
awa = settings.mount_angle+ev.target.value.getInt16(1, true)*0.1;
if (awa<0) awa += 360;
aws = ev.target.value.getInt16(3, true)*0.01;
// console.log(awa, aws);
//console.log(awa, aws);
if (gps_course.spd > 0) {
wv = { // wind vector (in fixed reference frame)
lon: Math.sin(Math.PI*(gps_course.course+awa)/180)*aws,
lat: Math.cos(Math.PI*(gps_course.course+awa)/180)*aws
wv = { // wind vector (in "earth" reference frame)
vlon: Math.sin(Math.PI*(gps_course.course+(awa+180))/180)*aws,
vlat: Math.cos(Math.PI*(gps_course.course+(awa+180))/180)*aws
};
twv = { lon: wv.lon+gps_course.lon, lat: wv.lat+gps_course.lat };
tws = Math.sqrt(Math.pow(twv.lon,2)+Math.pow(twv.lat, 2));
twa = Math.atan2(twv.lat, twv.lon)*180/Math.PI-gps_course.course;
twv = { vlon: wv.vlon+gps_course.vlon, vlat: wv.vlat+gps_course.vlat };
tws = Math.sqrt(Math.pow(twv.vlon,2)+Math.pow(twv.vlat, 2));
twa = 180+Math.atan2(twv.vlon, twv.vlat)*180/Math.PI-gps_course.course;
if (twa<0) twa += 360;
if (twa>360) twa -=360;
}
@ -57,15 +62,18 @@ function draw_compass(awa, aws, twa, tws) {
a = i*Math.PI/2+Math.PI/4;
g.drawLineAA(cx+Math.cos(a)*w*0.85, cy+Math.sin(a)*w*0.85, cx+Math.cos(a)*w*0.99, cy+Math.sin(a)*w*0.99);
}
g.setColor(0, 1, 0).fillCircle(cx+Math.sin(Math.PI*awa/180)*w*0.9, cy+Math.cos(Math.PI*awa/180)*w*0.9, w*0.1);
g.setColor(0, 1, 0).fillCircle(cx+Math.sin(Math.PI*awa/180)*w*0.9, cy-Math.cos(Math.PI*awa/180)*w*0.9, w*0.1);
if (tws>0) g.setColor(1, 0, 0).fillCircle(cx+Math.sin(Math.PI*twa/180)*w*0.9, cy+Math.cos(Math.PI*twa/180)*w*0.9, w*0.1);
g.setColor(0, 1, 0).setFont("7x11Numeric7Seg",w*0.06);
g.setFontAlign(0, 0, 0).drawString(aws.toFixed(1), cx, cy-0.32*w);
if (tws>0) g.setColor(1, 0, 0).drawString(tws.toFixed(1), cx, cy+0.32*w);
if (settings.truewind && typeof gps_course.spd!=='undefined') {
spd = gps_course.spd/1.852;
g.setColor(g.theme.fg).setFont("7x11Numeric7Seg", w*0.03).setFontAlign(-1, 1, 0).drawString(spd.toFixed(1), 1, g.getHeight()-1);
if (!pause_gps) {
if (tws>0) g.setColor(1, 0, 0).drawString(tws.toFixed(1), cx, cy+0.32*w);
if (settings.truewind && gps_course.spd!=-1) {
spd = gps_course.spd/1.852;
g.setColor(g.theme.fg).setFont("7x11Numeric7Seg", w*0.03).setFontAlign(-1, 1, 0).drawString(spd.toFixed(1), 1, g.getHeight()-1);
}
}
if (pause_gps) g.setColor("#f00").drawImage(atob("DAwBEAKARAKQE4DwHkPqPRGKAEAA"),g.getWidth()-15, g.getHeight()-15);
}
function parseDevice(d) {
@ -96,8 +104,10 @@ if (settings.truewind) {
Bangle.on('GPS',function(fix) {
if (fix.fix && fix.satellites>3 && fix.speed>2) { // only uses fixes w/ more than 3 sats and speed > 2kph
gps_course =
{ lon: Math.sin(Math.PI*fix.course/180)*fix.speed/1.852,
lat: Math.cos(Math.PI*fix.course/180)*fix.speed/1.852,
{ vlon: Math.sin(Math.PI*fix.course/180)*fix.speed/1.852,
vlat: Math.cos(Math.PI*fix.course/180)*fix.speed/1.852,
lat: fix.lat,
lon: fix.lon,
spd: fix.speed,
course: fix.course
};
@ -107,6 +117,20 @@ if (settings.truewind) {
Bangle.setGPSPower(1, "app");
}
if (settings.truewind) {
Bangle.on("swipe", (d)=>{
if (d==-1 && !pause_gps) {
pause_gps = true;
Bangle.setGPSPower(0);
draw_compass(0, 0, 0, 0);
}
else if (d==1 && pause_gps) {
pause_gps = false;
Bangle.setGPSPower(1, "app");
draw_compass(0, 0, 0, 0);
}
});
}
Bangle.loadWidgets();
Bangle.drawWidgets();
draw_compass(0, 0, 0, 0);

2
apps/openwind/metadata.json
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@ -1,7 +1,7 @@
{ "id": "openwind",
"name": "OpenWind",
"shortName":"OpenWind",
"version":"0.01",
"version":"0.02",
"description": "OpenWind",
"icon": "openwind.png",
"readme": "README.md",