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Split up pathTransform

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This commit is contained in:
Ansis Brammanis
2013-01-22 12:03:23 -05:00
parent 397372b505
commit 00e5ca25ee
1 changed files with 56 additions and 65 deletions
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js/id/svg/labels.js
+56 -65
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@@ -60,68 +60,47 @@ iD.svg.Labels = function(projection) {
return texts;
}
function getPathTransform(projection) {
var nodeCache = {};
return function pathTransform(entity) {
var length = 0,
w = entity.tags.name.length * width;
function reverse(p) {
var angle = Math.atan2(p[1][1] - p[0][1], p[1][0] - p[0][0]),
reverse = !(p[0][0] < p[p.length - 1][0] && angle < Math.PI/2 && angle > - Math.PI/2);
return reverse;
}
var nodes = nodeCache[entity.id];
if (typeof nodes === 'undefined') {
nodes = nodeCache[entity.id] = _.pluck(entity.nodes, 'loc')
.map(iD.svg.RoundProjection(projection));
}
function segmentLength(i) {
var dx = nodes[i][0] - nodes[i + 1][0];
var dy = nodes[i][1] - nodes[i + 1][1];
return Math.sqrt(dx * dx + dy * dy);
}
for (var i = 0; i < nodes.length - 1; i++) {
length += segmentLength(i);
}
if (length < w + 20) return null;
var ends = (length - w) / 2,
sofar = 0,
start, end,
n1, n2;
for (var i = 0; i < nodes.length - 1; i++) {
var current = segmentLength(i);
if (!start && sofar + current > ends) {
var portion = (ends - sofar) / current;
start = [
nodes[i][0] + portion * (nodes[i + 1][0] - nodes[i][0]),
nodes[i][1] + portion * (nodes[i + 1][1] - nodes[i][1])
];
n1 = nodes[i + 1];
}
if (!end && sofar + current > length - ends) {
var portion = (length - ends - sofar) / current;
end = [
nodes[i][0] + portion * (nodes[i + 1][0] - nodes[i][0]),
nodes[i][1] + portion * (nodes[i + 1][1] - nodes[i][1])
];
n2 = nodes[i];
}
sofar += current;
}
var angle = Math.atan2(n1[1] - start[1], n1[0] - start[0]);
var reverse = !(start[0] < end[0] && angle < Math.PI/2 && angle > - Math.PI/2);
return {
length: length,
width: Math.abs(start[0] - end[0]),
height: Math.abs(start[1] - end[1]),
start: start,
end: end,
reverse: reverse
};
function subpath(nodes, from, to) {
function segmentLength(i) {
var dx = nodes[i][0] - nodes[i + 1][0];
var dy = nodes[i][1] - nodes[i + 1][1];
return Math.sqrt(dx * dx + dy * dy);
}
var sofar = 0,
start, end, i0, i1;
for (var i = 0; i < nodes.length - 1; i++) {
var current = segmentLength(i);
if (!start && sofar + current > from) {
var portion = (from - sofar) / current;
start = [
nodes[i][0] + portion * (nodes[i + 1][0] - nodes[i][0]),
nodes[i][1] + portion * (nodes[i + 1][1] - nodes[i][1])
];
i0 = i + 1;
}
if (!end && sofar + current > to) {
var portion = (to - sofar) / current;
end = [
nodes[i][0] + portion * (nodes[i + 1][0] - nodes[i][0]),
nodes[i][1] + portion * (nodes[i + 1][1] - nodes[i][1])
];
i1 = i;
}
sofar += current;
}
var ret = nodes.slice(i0, i1);
ret.unshift(start);
ret.push(end);
return ret;
}
@@ -145,7 +124,6 @@ iD.svg.Labels = function(projection) {
}
var entities = roads.concat(buildings).concat(points);
var pathTransform = getPathTransform(projection);
var positions = {
point: [],
@@ -189,10 +167,23 @@ iD.svg.Labels = function(projection) {
}
function getLineLabel(entity) {
var p = pathTransform(entity);
if (!p) return;
var rect = new RTree.Rectangle(Math.min(p.start[0], p.end[0]) - 5, Math.min(p.start[1], p.end[1]) - 5, p.width + 10, p.height + 10);
if (tryInsert(rect)) return p;
var nodes = _.pluck(entity.nodes, 'loc').map(projection),
length = iD.util.geo.pathLength(nodes),
w = width * entity.tags.name.length;
if (length < w + 20) return;
var ends = (length - w) / 2,
sub = subpath(nodes, ends, length - ends),
rev = reverse(sub),
rect = new RTree.Rectangle(
Math.min(sub[0][0], sub[sub.length - 1][0]) - 5,
Math.min(sub[0][1], sub[sub.length - 1][1]) - 5,
Math.abs(sub[0][0] - sub[sub.length - 1][0]) + 10,
Math.abs(sub[0][1] - sub[sub.length - 1][1]) + 10
);
if (tryInsert(rect)) return {
reverse: rev
};
}
function getAreaLabel(entity) {