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warp-nypl.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Canvas Warp NYPL</title>
<script src="modestmaps.js" type="text/javascript" language="javascript1.5"></script>
<script src="delaunay.js" type="text/javascript" language="javascript1.5"></script>
<script src="wms.js" type="text/javascript" language="javascript1.5"></script>
<style type="text/css" title="text/css">
<!--
body { background-color: #bbb; margin: 15px; }
.map
{
border: 1px solid black;
background-color: #ccc;
width: 550px;
height: 450px;
position: absolute !important;
left: 15px;
top: 45px;
}
#combine { left: 580px; }
#output
{
position: absolute !important;
left: 15px;
top: 510px;
white-space: pre-wrap;
font: 11px/13px monospace;
}
-->
</style>
</head>
<body>
<p>
There's a <a href="http://mike.teczno.com/notes/canvas-warp.html">blog post that explains all this</a>.
</p>
<div id="picture" class="map"></div>
<!--<div id="basemap" class="map"></div>-->
<div id="combine" class="map"></div>
<div id="output"></div>
<script type="text/javascript" language="javascript1.5">
<!--
var mm = com.modestmaps;
var Marker = function(geo, img)
{
this.geo = geo;
this.img = img;
}
var Follower = function(mesh, map, location, index)
{
this.map = map;
this.mesh = mesh;
this.location = location;
this.coord = map.provider.locationCoordinate(location);
var follower = this;
var zoomedCallback = function(m, a) { return follower.zoomed(m); };
map.addCallback('zoomed', zoomedCallback);
map.addCallback('centered', zoomedCallback);
map.addCallback('extentset', zoomedCallback);
map.addCallback('panned', function(m, a) { return follower.draw(); });
this.div = document.createElement('div');
this.div.style.position = 'absolute';
this.div.style.width = '32px';
this.div.style.height = '32px';
this.div.style.cursor = 'pointer';
this.div.style.background = 'url("marker-centered.png")';
this.div.style.textAlign = 'center';
this.div.style.font = '11px/40px sans-serif';
//this.div.innerHTML = index.toString();
this.div.onmousedown = function(e) { follower.onmousedown(e); };
map.parent.appendChild(this.div);
this.draw();
}
Follower.prototype = {
map: null,
div: null,
mesh: null,
coord: null,
location: null,
zoomed: function(map)
{
this.coord = this.coord.zoomTo(map.coordinate.zoom);
this.draw(map);
},
draw: function()
{
try {
var point = this.map.coordinatePoint(this.coord);
} catch(e) {
// too soon?
return;
}
if(point.x < 0) {
// too far left
this.div.style.display = 'none';
} else if(point.y < 0) {
// too far up
this.div.style.display = 'none';
} else if(point.x > this.map.dimensions.x) {
// too far right
this.div.style.display = 'none';
} else if(point.y > this.map.dimensions.y) {
// too far down
this.div.style.display = 'none';
} else {
this.div.style.display = 'block';
this.div.style.left = point.x - 16 + 'px';
this.div.style.top = point.y - 16 + 'px';
}
},
onmousedown: function(e)
{
e.cancelBubble = true;
if (e.stopPropagation) e.stopPropagation();
var follower = this;
this.div.ondragstart = function(e) { return false; };
document.onmousemove = function(e) { follower.onmousemove(e) };
document.onmouseup = function(e) { follower.onmouseup(e) };
},
onmousemove: function(e)
{
e.cancelBubble = true;
if (e.stopPropagation) e.stopPropagation();
var x = e.clientX;
var y = e.clientY - 8;
for(var node = this.map.parent; node; node = node.offsetParent)
{
x -= node.offsetLeft;
y -= node.offsetTop;
}
var loc = this.map.pointLocation(new mm.Point(x, y));
this.coord = this.map.provider.locationCoordinate(loc);
this.location.lat = loc.lat;
this.location.lon = loc.lon;
this.draw();
this.mesh.draw(true);
},
onmouseup: function(e)
{
e.cancelBubble = true;
if (e.stopPropagation) e.stopPropagation();
document.onmousemove = null;
document.onmouseup = null;
}
};
//var zoomify = new WMSProvider('http://localhost/~migurski/Canvas%20Warp/pages-12-13_img', 11946, 5670);
var zoomify = new WMSProvider('http://dev.maps.nypl.org/warper/mapscans/wms/7371', 5099, 4071);
var picture = new mm.Map('picture', zoomify, new mm.Point(550, 450))
picture.setCenterZoom(new mm.Location(1500, 2500), 2);
picture.draw();
var combine = new mm.Map('combine', new mm.MapProvider(function(c) { return 'http://tile.openstreetmap.org/'+c.zoom+'/'+c.column+'/'+c.row+'.png'; }), new mm.Point(550, 450))
combine.setCenterZoom(new mm.Location(43.349, -76.152), 9);
combine.draw();
var canvas = document.createElement('canvas');
canvas.style.position = 'absolute';
canvas.style.opacity = 0.65;
canvas.width = 550;
canvas.height = 450;
combine.parent.appendChild(canvas);
var Mesh = function(picture, basemap, canvas, markers)
{
this.canvas = canvas;
this.picture = picture;
this.basemap = basemap;
this.markers = markers;
this.revision = 1;
var canvas = document.createElement('canvas');
canvas.style.position = 'absolute';
canvas.width = 550;
canvas.height = 450;
picture.parent.appendChild(canvas);
var mesh = this;
this.picture.addCallback('zoomed', function(m, a) { return mesh.draw(false); });
this.picture.addCallback('centered', function(m, a) { return mesh.draw(false); });
this.picture.addCallback('extentset', function(m, a) { return mesh.draw(false); });
this.picture.addCallback('panned', function(m, a) { return mesh.draw(false); });
this.basemap.addCallback('zoomed', function(m, a) { return mesh.draw(true); });
this.basemap.addCallback('centered', function(m, a) { return mesh.draw(true); });
this.basemap.addCallback('extentset', function(m, a) { return mesh.draw(true); });
this.basemap.addCallback('panned', function(m, a) { return mesh.draw(true); });
for(var i in markers)
{
var f1 = new Follower(this, picture, markers[i].img, parseInt(i) + 1);
var f2 = new Follower(this, basemap, markers[i].geo, parseInt(i) + 1);
}
}
Mesh.prototype = {
picture: null,
basemap: null,
markers: null,
draw: function(updatePicture)
{
if(updatePicture)
{
this.revision += 1;
this.canvas.getContext('2d').clearRect(0, 0, this.canvas.width, this.canvas.height);
}
var triangles = this.makeTriangles(this.markers);
var c;
for(var node = this.picture.parent.lastChild; node; node = node.previousSibling)
{
if(node.tagName.toLowerCase() == 'canvas')
{
c = node.getContext('2d');
c.clearRect(0, 0, node.width, node.height);
break;
}
}
for(var i in triangles)
{
if(updatePicture)
{
this.warpTo(triangles[i][0], triangles[i][1], triangles[i][2], this.revision);
}
if(c)
{
var p1 = this.picture.locationPoint(triangles[i][0].img);
var p2 = this.picture.locationPoint(triangles[i][1].img);
var p3 = this.picture.locationPoint(triangles[i][2].img);
c.save();
c.setTransform(1, 0, 0, 1, 0, 0);
c.beginPath();
c.moveTo(p1.x, p1.y);
c.lineTo(p2.x, p2.y);
c.lineTo(p3.x, p3.y);
c.lineTo(p1.x, p1.y);
c.closePath();
c.strokeStyle = 'red';
c.stroke();
c.restore();
}
}
var output = document.getElementById('output');
if(output)
{
var ms = [];
for(var i in this.markers)
{
var m = this.markers[i];
ms.push(' {"img": [' + m.img.lon.toFixed(0) + ', ' + m.img.lat.toFixed(0) + '], "geo": [' + m.geo.lat.toFixed(7) + ', ' + m.geo.lon.toFixed(7) + ']}');
}
output.innerHTML = '// markers\n[\n' + ms.join(',\n') + '\n]';
}
},
makeTriangles: function(markers)
{
var w = this.picture.provider.bottomright.column;
var h = this.picture.provider.bottomright.row;
var supertriangle = [new mm.Point(-w/2, 0), new mm.Point(w * 3/2, 0), new mm.Point(w/2, h*2)];
var triangles = [supertriangle];
for(var i in markers)
{
var loc = markers[i].img;
addPoint(new mm.Point(loc.lon, loc.lat), triangles);
}
// delete triangles that touch the outside supertriangle
for(var i in triangles)
{
var trim = false;
for(var j in triangles[i])
{
for(var k in supertriangle)
{
if(supertriangle[k] == triangles[i][j])
{
trim = true;
break;
}
}
if(trim)
{
delete triangles[i];
break;
}
}
}
// replace each of the points in each triangle with an original marker
for(var i = 0; i < triangles.length; i += 1)
{
if(triangles[i] == undefined)
{
triangles.splice(i, 1);
i -= 1;
continue;
}
for(var j in triangles[i])
{
for(var k in markers)
{
if(markers[k].img.lat == triangles[i][j].y && markers[k].img.lon == triangles[i][j].x)
{
triangles[i][j] = markers[k];
}
}
}
}
return triangles;
},
warpTo: function(m1, m2, m3, revision)
{
// pixel positions of triangle corners
var p1 = this.basemap.locationPoint(m1.geo);
var p2 = this.basemap.locationPoint(m2.geo);
var p3 = this.basemap.locationPoint(m3.geo);
// coordinates of triangle corners
var c1 = new mm.Coordinate(m1.img.lat, m1.img.lon, this.picture.provider.bottomright.zoom);
var c2 = new mm.Coordinate(m2.img.lat, m2.img.lon, this.picture.provider.bottomright.zoom);
var c3 = new mm.Coordinate(m3.img.lat, m3.img.lon, this.picture.provider.bottomright.zoom);
// transformation from image pixel space to html pixel space
var t = mm.Transformation.prototype.deriveTransformation(c1.column, c1.row, p1.x, p1.y, c2.column, c2.row, p2.x, p2.y, c3.column, c3.row, p3.x, p3.y);
//alert([t.ax, t.bx, t.cx, t.ay, t.by, t.cy]);
// get the best resampled zoom level from the image pyramid
var sx = Math.sqrt(Math.pow(t.ax, 2) + Math.pow(t.bx, 2));
var sy = Math.sqrt(Math.pow(t.ay, 2) + Math.pow(t.by, 2));
var s = Math.max(sx, sy); //(sx + sy) / 2;
var z = this.picture.provider.bottomright.zoom + Math.min(0, Math.round(Math.log(s) / Math.LN2));
//alert(['native zoom level', z, Math.min(0, Math.round(Math.log(s) / Math.LN2)), this.picture.provider.bottomright.zoom].join('\n'));
// pixel space zoom-corrected coordinates of triangle corners
c1 = c1.zoomTo(z);
c2 = c2.zoomTo(z);
c3 = c3.zoomTo(z);
// do this again at the corrected zoom
var t = mm.Transformation.prototype.deriveTransformation(c1.column, c1.row, p1.x, p1.y, c2.column, c2.row, p2.x, p2.y, c3.column, c3.row, p3.x, p3.y);
//alert(['pixel space transform', t.ax, t.bx, t.cx, t.ay, t.by, t.cy].join('\n'));
// for later, in pixel space
var triangle = [c1.column, c1.row, c2.column, c2.row, c3.column, c3.row];
var transform = [t.ax, t.ay, t.bx, t.by, t.cx, t.cy];
// tile space zoom-corrected coordinates of triangle corners
c1 = c1.zoomBy(-8);
c2 = c2.zoomBy(-8);
c3 = c3.zoomBy(-8);
var minrow = Math.min(c1.row, c2.row, c3.row);
var maxrow = Math.max(c1.row, c2.row, c3.row);
var mincol = Math.min(c1.column, c2.column, c3.column);
var maxcol = Math.max(c1.column, c2.column, c3.column);
var ul = new mm.Coordinate(minrow, mincol, c1.zoom).container();
var br = new mm.Coordinate(maxrow, maxcol, c1.zoom).container();
//alert(['boundaries of triangle', minrow, mincol, maxrow, maxcol, ul, br].join('\n'));
var tiles = [];
for(var row = ul.row; row <= br.row; row += 1)
{
for(var col = ul.column; col <= br.column; col += 1)
{
var tile = new mm.Coordinate(row, col, ul.zoom);
var offset = new mm.Point(tile.zoomBy(8).column, tile.zoomBy(8).row);
var url = this.picture.provider.getTileUrl(tile);
tiles.push({tile: tile, offset: offset, url: url, transform: transform, triangle: triangle});
}
}
//alert('Drawing ' + tiles.length + ' tiles');
this.drawTiles(tiles, revision);
},
drawTiles: function(tiles, revision)
{
var mesh = this;
var c = this.canvas.getContext('2d');
if(tiles.length)
{
var tile = tiles.shift();
var img = new Image();
img.onload = function()
{
if(mesh.revision != revision)
{
return;
}
c.save();
c.setTransform(tile.transform[0], tile.transform[1], tile.transform[2], tile.transform[3], tile.transform[4], tile.transform[5]);
c.beginPath();
c.moveTo(tile.triangle[0], tile.triangle[1]);
c.lineTo(tile.triangle[2], tile.triangle[3]);
c.lineTo(tile.triangle[4], tile.triangle[5]);
c.lineTo(tile.triangle[0], tile.triangle[1]);
c.closePath();
c.clip();
c.drawImage(this, tile.offset.x, tile.offset.y, 256, 256);
c.restore();
mesh.drawTiles(tiles, revision);
}
img.src = tile.url;
}
}
};
// markers
var markers = [
{"img": [3076, 196], "geo": [43.5295365, -76.6413942]},
{"img": [1340, 2980], "geo": [43.1620200, -75.7254091]},
{"img": [3852, 2980], "geo": [43.7333019, -75.7295290]},
{"img": [3780, 1372], "geo": [43.7204007, -76.2403932]},
{"img": [1380, 196], "geo": [43.1860563, -76.6249147]}
];
for(var i in markers)
{
var m = markers[i];
markers[i] = new Marker(new mm.Location(m.geo[0], m.geo[1]), new mm.Location(m.img[1], m.img[0]));
}
var mesh = new Mesh(picture, combine, canvas, markers);
mesh.draw(true);
//-->
</script>
</body>
</html>