Created
March 2, 2017 19:43
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//changed clat, now lat / lon is in wrong place | |
var mapimg, | |
clat = 10, | |
clon = 0, | |
ww = 1024, | |
hh = 512, | |
zoom = 1, | |
earthquakes; | |
//hardcoding lat/lon for demo | |
var lat = 30, | |
lon = -90.1207; | |
function preload() { | |
mapimg = loadImage('https://api.mapbox.com/styles/v1/mapbox/dark-v9/static/' + | |
clat + ',' + clon + ',' + zoom + '/' + ww + 'x' + hh + | |
'?access_token=pk.eyJ1IjoidGFjYXJzb24iLCJhIjoiY2l6NHY2dDA5MDR0czMycGd4ajMzdGsxZyJ9.gar4fJVs8Yk8HcRo9oG2ng') | |
katrina = loadStrings('katrina.csv'); | |
} | |
//for map projection | |
function mercX(lon) { | |
lon = radians(lon); | |
var a = (256 / PI) * pow(2, zoom), | |
b = lon + PI; | |
return a * b; | |
} | |
function mercY(lat) { | |
lat = radians(lat); | |
var a = (256 / PI) * pow(2, zoom), | |
b = tan(PI / 4 + lat / 2), | |
c = PI - log(b); | |
return a * c; | |
} | |
function setup() { | |
createCanvas(ww, hh); | |
translate(width / 2, height / 2); | |
imageMode(CENTER); | |
image(mapimg, 0, 0); | |
var cx = mercX(clon), | |
cy = mercY(clat); | |
for (var i = 2; i < katrina.length; i++) { | |
var data = katrina[i].split(/,/); | |
// var lat = data[1], | |
// lon = -data[2]; | |
// do projection | |
var x = mercX(lon) - cx, | |
y = mercY(lat) - cy; | |
//draw | |
stroke(255, 0, 255); | |
fill(255, 0, 255, 200); | |
ellipse(x, y, 5, 5); | |
} | |
} |
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