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Use more accurate data to get continent name from lat and lng #31

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Use more accurate data to get continent name from lat and lng #31

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f44ad19
Update continents data
Low-power Oct 10, 2017
46faced
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Low-power Oct 10, 2017
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90 changes: 64 additions & 26 deletions src/Boardroom.js
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Original file line number Diff line number Diff line change
Expand Up @@ -489,32 +489,70 @@ function updateSliders(animateTime){
}

function findArea(lat, lng){
if(lat <= -40){
return "antarctica";
}
if(lat > 12 && lng > -180 && lng < -45){
return "northamerica";
}
if(lat <= 12 && lat > -40 && lng > -90 && lng < -30){
return "southamerica";
}
if(lat < -10 && lng >= 105 && lng <=155){
return "australia";
}
if(lat > 20 && lng >= 60 && lng <=160){
return "asia";
}
if(lat > 10 && lat < 40 && lng >= 35 && lng <=60){
return "asia";
}
if(lat > -40 && lat < 35 && lng >= -20 && lng <=50){
return "africa";
}
if(lat >= 35 && lng >= -10 && lng <=40){
return "europe";
}

return "other";
// Data are from Daniel Pereira
// Polygon code from https://wrf.ecse.rpi.edu/Research/Short_Notes/pnpoly.html

const LatNAm = [90, 90, 78.13, 57.5, 15, 15, 1.25, 1.25, 51, 60, 60];
const LonNAm = [-168.75, -10, -10, -37.5, -30, -75, -82.5, -105, -180, -180, -168.75];
const LatNA2 = [51, 51, 60];
const LonNA2 = [166.6, 180, 180];

const LatSAm = [1.25, 1.25, 15, 15, -60, -60];
const LonSAm = [-105, -82.5, -75, -30, -30, -105];

const LatEur = [90, 90, 42.5, 42.5, 40.79, 41, 40.55, 40.40, 40.05, 39.17, 35.46, 33, 38, 35.42, 28.25, 15, 57.5,78.13];
const LonEur = [-10, 77.5, 48.8, 30, 28.81, 29, 27.31, 26.75, 26.36, 25.19, 27.91, 27.5, 10, -10, -13, -30, -37.5, -10]

const LatAfr = [15, 28.25, 35.42, 38, 33, 31.74, 29.54, 27.78, 11.3, 12.5, -60, -60];
const LonAfr = [-30, -13, -10, 10, 27.5, 34.58, 34.92, 34.46, 44.3, 52, 75, -30];

const LatAus = [-11.88, -10.27, -10, -30, -52.5, -31.88];
const LonAus = [110, 140, 145, 161.25, 142.5, 110];

const LatAsi = [90, 42.5, 42.5, 40.79, 41, 40.55, 40.4, 40.05, 39.17, 35.46, 33, 31.74, 29.54, 27.78, 11.3, 12.5, -60, -60, -31.88, -11.88, -10.27, 33.13, 51, 60, 90];
const LonAsi = [77.5, 48.8, 30, 28.81, 29, 27.31, 26.75, 26.36, 25.19, 27.91, 27.5, 34.58, 34.92, 34.46, 44.3, 52, 75, 110, 110, 110, 140, 140, 166.6, 180, 180];
const LatAs2 = [90, 90, 60, 60];
const LonAs2 = [-180, -168.75, -168.75, -180];

const LatAnt = [-60, -60, -90, -90];
const LonAnt = [-180, 180, 180, -180];

var is_in_polygon = function(lat, lng, plats, plngs) {
var i, j;
var r = false;
// assert(plats.length == plngs.length)
for(i = 0, j = plats.length - 1; i < plats.length; j = i++) {
if(((plats[i] > lat) != (plats[j] > lat)) &&
(lng < (plngs[j] - plngs[i]) * (lat - plats[i]) / (plats[j] - plats[i]) + plngs[i])) {
r = !r;
}
}
return r;
};

if(is_in_polygon(lat, lng, LatSAm, LonSAm)) {
return "southamerica";
}
if(is_in_polygon(lat, lng, LatNAm, LonNAm)) {
return "northamerica";
}
if(is_in_polygon(lat, lng, LatEur, LonEur)) {
return "europe";
}
if(is_in_polygon(lat, lng, LatAsi, LonAsi) || is_in_polygon(lat, lng, LatAs2, LonAs2)) {
return "asia";
}
if(is_in_polygon(lat, lng, LatAus, LonAus)) {
return "australia";
}
if(is_in_polygon(lat, lng, LatAfr, LonAfr)) {
return "africa";
}
if(is_in_polygon(lat, lng, LatAnt, LonAnt)) {
return "antarctica";
}

return "other";
}


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