mirror of https://github.com/espruino/BangleApps
156 lines
5.3 KiB
HTML
156 lines
5.3 KiB
HTML
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<html>
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<head>
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</head>
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<body>
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<script src="https://espruino.github.io/EspruinoWebTools/heatshrink.js"></script>
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<script src="https://espruino.github.io/EspruinoWebTools/imageconverter.js"></script>
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<!--<script src="https://espruino.github.io/EspruinoWebTools/uart.js"></script>-->
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<script src="file:///home/gw/workspace/EspruinoWebTools/uart.js"></script>
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<p>An online map loader for Espruino...</p>
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Scale <input type="text" id="scale" value="20000"></input><br/>
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Geo URI <input type="text" id="uri" value="geo:51.7079,-1.2926?z=16"></input><br/>
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<button id="geturl">Get URL</button><a name="url"></a><br/>
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<input type="file" id="fileLoader"/><br/>
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<img id="mapimg"/><br/>
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<canvas id="canvas" style="display:none;"></canvas>
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<button id="upload" style="display:none;">Upload</button>
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<pre id="log"></pre>
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<!--
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We can request this directly, eg:
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https://render.openstreetmap.org/cgi-bin/export?bbox=-1.27,51.64,-1.26,51.65&scale=20000&format=png
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https://render.openstreetmap.org/cgi-bin/export?bbox=-1.2731999999999999,51.6472,-1.2632,51.6572&scale=20000&format=png
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then we need:
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var map = {
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imgx : 361,
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imgy : 343,
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tilesize : 64,
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scale : 20000, // scale
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lat : 51.65270, // coords of center
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lon : -1.27052
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};
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find lat/lon? https://help.openstreetmap.org/questions/2702/extracting-coordinates-by-clicking-on-an-openstreetmap
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-->
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<script>
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TILESIZE = 64;
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var img;
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var tiles = [];
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function log(x) {
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document.getElementById("log").innerText += x+"\n";
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console.log(x);
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}
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function getURL() {
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var uri = document.getElementById("uri").value;
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var latlon = uri.match("geo:(-?[0-9\.]+),(-?[0-9\.]+)?");
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if (latlon==null) {
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log("Invalid URI!");
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return;
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}
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var map = {
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imgx :img?img.width:0,
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imgy : img?img.height:0,
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lat : parseFloat(latlon[1]),
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lon : parseFloat(latlon[2]),
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tilesize : TILESIZE,
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scale : parseInt(document.getElementById("scale").value)
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};
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log(JSON.stringify(map,null,2));
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var s = 0.005;
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var x1 = map.lon-s,
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x2 = map.lon+s,
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y1 = map.lat-s,
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y2 = map.lat+s;
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var url = "https://render.openstreetmap.org/cgi-bin/export?bbox="+x1+","+y1+","+x2+","+y2+"&scale="+map.scale+"&format=png"
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document.getElementById("url").href = url;
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document.getElementById("url").innerText = url;
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/*var mapimg = document.getElementById("mapimg");
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mapimg.src = url;
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mapimg.onload = function() {
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log("Image loaded!");
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}*/
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}
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function imageLoaded() {
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if (img === undefined) return;
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var options = { compression:true, mode:"web", output:"string"};
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var canvas = document.getElementById("canvas")
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canvas.width = TILESIZE*2;
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canvas.height = TILESIZE;
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canvas.style = "display:block;border:1px solid black;margin:8px;"
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var ctx = canvas.getContext("2d");
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console.log(img.width+"x"+img.height);
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var w = Math.round(img.width / TILESIZE);
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var h = Math.round(img.height / TILESIZE);
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console.log("->"+w+"x"+h);
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for (var y=0;y<h;y++) {
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for (var x=0;x<w;x++) {
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ctx.fillStyle = 'black';
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ctx.fillRect(0,0,TILESIZE,TILESIZE);
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ctx.drawImage(img,-x*TILESIZE,-y*TILESIZE);
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var imageData = ctx.getImageData(0, 0, TILESIZE, TILESIZE);
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var rgba = imageData.data;
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options.rgbaOut = rgba;
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options.width = TILESIZE;
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options.height = TILESIZE;
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var imgstr = imageconverter.RGBAtoString(rgba, options);
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ctx.putImageData(imageData,TILESIZE,0);
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var compress = 'require("heatshrink").decompress('
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if (!imgstr.startsWith(compress)) throw "Data in wrong format";
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imgstr = imgstr.slice(compress.length,-1);
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tiles.push({
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name:"t"+x+"x"+y,
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value:imgstr
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});
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}
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}
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log("Tiling finished. "+tiles.length+" tiles");
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document.getElementById("upload").style.display = "block";
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}
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function handleFileSelect(event) {
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if (event.target.files.length != 1) return;
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var reader = new FileReader();
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reader.onload = function(event) {
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img = new Image();
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img.onload = imageLoaded;
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img.src = event.target.result;
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};
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reader.readAsDataURL(event.target.files[0]);
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};
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document.getElementById('fileLoader').addEventListener('change', handleFileSelect, false);
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document.getElementById('geturl').addEventListener('click', getURL);
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document.getElementById('upload').addEventListener('click', function() {
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UART.write("\x03s=require('Storage');\n", function() {
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log("Connected");
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function upload() {
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if (!tiles.length) {
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log("Success!");
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return;
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}
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var tile = tiles.shift();
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log("Uploading "+tile.name);
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UART.eval('s.write('+JSON.stringify(tile.name)+','+tile.value+')',function(r) {
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log("Returned "+r);
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upload();
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});
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}
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upload();
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});
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}, false);
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</script>
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</body>
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</html>
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