Create an arc like shape by specifying two points and drawing the points between them using HTML canvas
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June 21, 2016 22:15
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Great Circle
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| var initMap = function() { | |
| var provider = new com.modestmaps.TemplatedLayer('http://tile.openstreetmap.org/{Z}/{X}/{Y}.png'); | |
| var map = new com.modestmaps.Map('map', provider); | |
| var canvas = document.createElement('canvas'); | |
| canvas.style.position = 'absolute'; | |
| canvas.style.left = '0'; | |
| canvas.style.top = '0'; | |
| canvas.width = map.dimensions.x; | |
| canvas.height = map.dimensions.y; | |
| map.parent.appendChild(canvas); | |
| var locations = []; | |
| var sf = new com.modestmaps.Location(37.7749295, -122.4194155); | |
| var london = new com.modestmaps.Location(51.5001524, -0.1262362); | |
| for (var i = 0; i <= 100; i++) { | |
| var f = i/100.0; | |
| locations.push(com.modestmaps.Location.interpolate(sf, london, f)); | |
| } | |
| map.setExtent(locations); | |
| function redraw() { | |
| var ctx = canvas.getContext('2d'); | |
| ctx.clearRect(0,0,canvas.width,canvas.height); | |
| ctx.strokeStyle = '#404040'; | |
| ctx.beginPath(); | |
| var p = map.locationPoint(locations[0]); | |
| ctx.moveTo(p.x,p.y); | |
| for (var i = 1; i < locations.length; i++) { | |
| p = map.locationPoint(locations[i]); | |
| ctx.lineTo(p.x,p.y); | |
| } | |
| ctx.stroke(); | |
| } | |
| map.addCallback('drawn', redraw); | |
| map.addCallback('resized', function() { | |
| canvas.width = map.dimensions.x; | |
| canvas.height = map.dimensions.y; | |
| redraw(); | |
| }); | |
| redraw(); | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>Modest Maps JS Demo | Great Circle</title> | |
| <link rel='stylesheet' href='style.css'> | |
| </head> | |
| <body onload='initMap()'> | |
| <div id='map' /> | |
| <script src='https://rawgithub.com/stamen/modestmaps-js/master/modestmaps.min.js'></script> | |
| <script src='app.js'></script> | |
| </body> | |
| </html> |
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| body { | |
| font: 13px/22px 'Helvetica Neue', Helvetica, sans; | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #map { | |
| position: absolute; | |
| top: 0; left: 0; | |
| width: 100%; | |
| height: 100%; | |
| } |
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