mirror of https://github.com/espruino/BangleApps
90 lines
4.0 KiB
JavaScript
90 lines
4.0 KiB
JavaScript
function getLogo() {
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return require("heatshrink").decompress(atob("mUcggHE1QADCY3L3cA5gCBAAoXEDI0M3YVChe8BYmgDAwZE4AYDAAOwAYUKDAMKC4mgBgUL2AYFAgYQBDA4yC3e8MYRhIhQYFAoJ6DhYYHCoQRCDApMC3fA5gwHDAxqBG4R7BGQJ3DDA8KGIY7BAYUMO4pJDDAgXDQQYYBhmw5bgBDBY6EMgMLPYIxBQAPADAimDDYIhDPogYC3hOCLwT5D0ASCDAhIBcobMCCgYRDVwg6ChnLMIPA3cMDAgqEfIgxCCIIzB2BLBToIYMKAW7JYSYC4GwH4YYGJYJfCLoLHFDAIVBMY5hCSowWBgG8BYI/CCoY5EFYcLDAIXBPoYaCAgTNBAQQYEGgfMhYxBOIYwEJoRkDM4vLDAYJBDAj4FJghLBcIRYCCQRhCPogAEMAO8fgIuCDAg2EDAz5BS4YWBCQZgDJIUMB4TDCDAJiBAAT1FZwQLCCAm8DAIgEGIZNFDI27hhTGDIQYCPA28FgIvBGAQ"));
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}
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g.clear(1);
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g.drawImage(getLogo(),g.getWidth()-50, g.getHeight()-(28+24));
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Bangle.loadWidgets();
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Bangle.drawWidgets();
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function onGPS(fix) {
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var os = {northing:"---", easting:"---"}
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var state = "";
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if (fix.fix) {
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os = OsGridRef.latLongToOsGrid(fix);
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state = "GPS Fix";
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} else {
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state = "No Fix ";
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}
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var y = 30, h=48, d1 = 18, d2 = 80;
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g.reset();
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g.setFont("6x8",2).setFontAlign(-1,-1);
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g.drawString("Northing", 10,y);
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g.drawString("Easting", 10,y+d2);
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g.drawString(state,10,g.getHeight()-48,true/*erase bg*/)
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g.setFont("6x8",1);
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g.drawString(fix.satellites+" Satellites ",10,g.getHeight()-32,true/*erase bg*/)
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g.setFont("Vector",h).setFontAlign(1,-1);
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g.clearRect(0,y+d1,g.getWidth()-1,y+d1+h);
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g.drawString(os.northing, g.getWidth()-1,y+d1);
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g.clearRect(0,y+d1+d2,g.getWidth()-1,y+d1+d2+h);
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g.drawString(os.easting, g.getWidth()-1,y+d1+d2);
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}
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Bangle.setGPSPower(1);
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Bangle.on('GPS', onGPS);
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Number.prototype.toRad = function() { return this*Math.PI/180; };
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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/* Ordnance Survey Grid Reference functions (c) Chris Veness 2005-2014 */
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/* - www.movable-type.co.uk/scripts/gridref.js */
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/* - www.movable-type.co.uk/scripts/latlon-gridref.html */
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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function OsGridRef(easting, northing) {
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this.easting = 0|easting;
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this.northing = 0|northing;
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}
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OsGridRef.latLongToOsGrid = function(point) {
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var lat = point.lat.toRad();
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var lon = point.lon.toRad();
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var a = 6377563.396, b = 6356256.909; // Airy 1830 major & minor semi-axes
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var F0 = 0.9996012717; // NatGrid scale factor on central meridian
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var lat0 = (49).toRad(), lon0 = (-2).toRad(); // NatGrid true origin is 49<34>N,2<>W
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var N0 = -100000, E0 = 400000; // northing & easting of true origin, metres
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var e2 = 1 - (b*b)/(a*a); // eccentricity squared
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var n = (a-b)/(a+b), n2 = n*n, n3 = n*n*n;
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var cosLat = Math.cos(lat), sinLat = Math.sin(lat);
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var nu = a*F0/Math.sqrt(1-e2*sinLat*sinLat); // transverse radius of curvature
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var rho = a*F0*(1-e2)/Math.pow(1-e2*sinLat*sinLat, 1.5); // meridional radius of curvature
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var eta2 = nu/rho-1;
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var Ma = (1 + n + (5/4)*n2 + (5/4)*n3) * (lat-lat0);
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var Mb = (3*n + 3*n*n + (21/8)*n3) * Math.sin(lat-lat0) * Math.cos(lat+lat0);
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var Mc = ((15/8)*n2 + (15/8)*n3) * Math.sin(2*(lat-lat0)) * Math.cos(2*(lat+lat0));
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var Md = (35/24)*n3 * Math.sin(3*(lat-lat0)) * Math.cos(3*(lat+lat0));
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var M = b * F0 * (Ma - Mb + Mc - Md); // meridional arc
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var cos3lat = cosLat*cosLat*cosLat;
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var cos5lat = cos3lat*cosLat*cosLat;
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var tan2lat = Math.tan(lat)*Math.tan(lat);
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var tan4lat = tan2lat*tan2lat;
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var I = M + N0;
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var II = (nu/2)*sinLat*cosLat;
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var III = (nu/24)*sinLat*cos3lat*(5-tan2lat+9*eta2);
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var IIIA = (nu/720)*sinLat*cos5lat*(61-58*tan2lat+tan4lat);
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var IV = nu*cosLat;
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var V = (nu/6)*cos3lat*(nu/rho-tan2lat);
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var VI = (nu/120) * cos5lat * (5 - 18*tan2lat + tan4lat + 14*eta2 - 58*tan2lat*eta2);
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var dLon = lon-lon0;
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var dLon2 = dLon*dLon, dLon3 = dLon2*dLon, dLon4 = dLon3*dLon, dLon5 = dLon4*dLon, dLon6 = dLon5*dLon;
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var N = I + II*dLon2 + III*dLon4 + IIIA*dLon6;
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var E = E0 + IV*dLon + V*dLon3 + VI*dLon5;
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return new OsGridRef(E, N);
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};
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