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Merge pull request #3343 from fredj/line-arrows

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Line arrows example
This commit is contained in:
Frédéric Junod
2015-03-16 14:30:08 +01:00
parent d3f246518b b9aba8babd
commit 3a7b9751d7
5 changed files with 144 additions and 4 deletions
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examples/line-arrows.html Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<link rel="stylesheet" href="../css/ol.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="../resources/layout.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
<title>LineString arrows example</title>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
<div class="row-fluid">
<div class="span12">
<h4 id="title">LineString arrows example</h4>
<p id="shortdesc">Example of drawing arrows for each line string segment.</p>
<div id="docs">
<p>See the <a href="line-arrows.js" target="_blank">line-arrows.js source</a> to see how this is done.</p>
</div>
<div id="tags">draw, vector, arrow</div>
</div>
</div>
</div>
<script src="../resources/jquery.min.js" type="text/javascript"></script>
<script src="../resources/example-behaviour.js" type="text/javascript"></script>
<script src="loader.js?id=line-arrows" type="text/javascript"></script>
</body>
</html>

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examples/line-arrows.js Normal file
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goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.geom.Point');
goog.require('ol.interaction.Draw');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.MapQuest');
goog.require('ol.source.Vector');
goog.require('ol.style.Icon');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
var raster = new ol.layer.Tile({
source: new ol.source.MapQuest({layer: 'sat'})
});
var source = new ol.source.Vector();
var styleFunction = function(feature, resolution) {
var geometry = feature.getGeometry();
var styles = [
// linestring
new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#ffcc33',
width: 2
})
})
];
geometry.forEachSegment(function(start, end) {
var dx = end[0] - start[0];
var dy = end[1] - start[1];
var rotation = Math.atan2(dy, dx);
// arrows
styles.push(new ol.style.Style({
geometry: new ol.geom.Point(end),
image: new ol.style.Icon({
src: 'data/arrow.png',
anchor: [0.75, 0.5],
rotateWithView: false,
rotation: -rotation
})
}));
});
return styles;
};
var vector = new ol.layer.Vector({
source: source,
style: styleFunction
});
var map = new ol.Map({
layers: [raster, vector],
renderer: exampleNS.getRendererFromQueryString(),
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
map.addInteraction(new ol.interaction.Draw({
source: source,
type: /** @type {ol.geom.GeometryType} */ ('LineString')
}));

10
src/ol/geom/flat/segmentsflatgeom.js
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@@ -9,20 +9,22 @@ goog.provide('ol.geom.flat.segments');
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @param {function(ol.Coordinate, ol.Coordinate): T} callback Function
* @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
* called for each segment.
* @param {S=} opt_this The object to be used as the value of 'this'
* within callback.
* @return {T|boolean} Value.
* @template T
* @template T,S
*/
ol.geom.flat.segments.forEach =
function(flatCoordinates, offset, end, stride, callback) {
function(flatCoordinates, offset, end, stride, callback, opt_this) {
var point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];
var point2 = [];
var ret;
for (; (offset + stride) < end; offset += stride) {
point2[0] = flatCoordinates[offset + stride];
point2[1] = flatCoordinates[offset + stride + 1];
ret = callback(point1, point2);
ret = callback.call(opt_this, point1, point2);
if (ret) {
return ret;
}

20
src/ol/geom/linestring.js
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@@ -11,6 +11,7 @@ goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.interpolate');
goog.require('ol.geom.flat.intersectsextent');
goog.require('ol.geom.flat.length');
goog.require('ol.geom.flat.segments');
goog.require('ol.geom.flat.simplify');
@@ -107,6 +108,25 @@ ol.geom.LineString.prototype.closestPointXY =
};
/**
* Iterate over each segment, calling the provided callback.
* If the callback returns a truthy value the function returns that
* value immediately. Otherwise the function returns `false`.
*
* @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
* called for each segment.
* @param {S=} opt_this The object to be used as the value of 'this'
* within callback.
* @return {T|boolean} Value.
* @template T,S
* @api
*/
ol.geom.LineString.prototype.forEachSegment = function(callback, opt_this) {
return ol.geom.flat.segments.forEach(this.flatCoordinates, 0,
this.flatCoordinates.length, this.stride, callback, opt_this);
};
/**
* Returns the coordinate at `m` using linear interpolation, or `null` if no
* such coordinate exists.