openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
254 lines (228 loc) • 7.95 kB
JavaScript
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.format.GeoJSON');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.OSM');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
goog.require('ol.style.Text');
var openSansAdded = false;
var myDom = {
points: {
text: document.getElementById('points-text'),
align: document.getElementById('points-align'),
baseline: document.getElementById('points-baseline'),
rotation: document.getElementById('points-rotation'),
font: document.getElementById('points-font'),
weight: document.getElementById('points-weight'),
size: document.getElementById('points-size'),
offsetX: document.getElementById('points-offset-x'),
offsetY: document.getElementById('points-offset-y'),
color: document.getElementById('points-color'),
outline: document.getElementById('points-outline'),
outlineWidth: document.getElementById('points-outline-width'),
maxreso: document.getElementById('points-maxreso')
},
lines: {
text: document.getElementById('lines-text'),
align: document.getElementById('lines-align'),
baseline: document.getElementById('lines-baseline'),
rotation: document.getElementById('lines-rotation'),
font: document.getElementById('lines-font'),
weight: document.getElementById('lines-weight'),
placement: document.getElementById('lines-placement'),
maxangle: document.getElementById('lines-maxangle'),
overflow: document.getElementById('lines-overflow'),
size: document.getElementById('lines-size'),
offsetX: document.getElementById('lines-offset-x'),
offsetY: document.getElementById('lines-offset-y'),
color: document.getElementById('lines-color'),
outline: document.getElementById('lines-outline'),
outlineWidth: document.getElementById('lines-outline-width'),
maxreso: document.getElementById('lines-maxreso')
},
polygons: {
text: document.getElementById('polygons-text'),
align: document.getElementById('polygons-align'),
baseline: document.getElementById('polygons-baseline'),
rotation: document.getElementById('polygons-rotation'),
font: document.getElementById('polygons-font'),
weight: document.getElementById('polygons-weight'),
placement: document.getElementById('polygons-placement'),
maxangle: document.getElementById('polygons-maxangle'),
overflow: document.getElementById('polygons-overflow'),
size: document.getElementById('polygons-size'),
offsetX: document.getElementById('polygons-offset-x'),
offsetY: document.getElementById('polygons-offset-y'),
color: document.getElementById('polygons-color'),
outline: document.getElementById('polygons-outline'),
outlineWidth: document.getElementById('polygons-outline-width'),
maxreso: document.getElementById('polygons-maxreso')
}
};
var getText = function(feature, resolution, dom) {
var type = dom.text.value;
var maxResolution = dom.maxreso.value;
var text = feature.get('name');
if (resolution > maxResolution) {
text = '';
} else if (type == 'hide') {
text = '';
} else if (type == 'shorten') {
text = text.trunc(12);
} else if (type == 'wrap' && dom.placement.value != 'line') {
text = stringDivider(text, 16, '\n');
}
return text;
};
var createTextStyle = function(feature, resolution, dom) {
var align = dom.align.value;
var baseline = dom.baseline.value;
var size = dom.size.value;
var offsetX = parseInt(dom.offsetX.value, 10);
var offsetY = parseInt(dom.offsetY.value, 10);
var weight = dom.weight.value;
var placement = dom.placement ? dom.placement.value : undefined;
var maxAngle = dom.maxangle ? parseFloat(dom.maxangle.value) : undefined;
var overflow = dom.overflow ? (dom.overflow.value == 'true') : undefined;
var rotation = parseFloat(dom.rotation.value);
if (dom.font.value == '\'Open Sans\'' && !openSansAdded) {
var openSans = document.createElement('link');
openSans.href = 'https://fonts.googleapis.com/css?family=Open+Sans';
openSans.rel = 'stylesheet';
document.getElementsByTagName('head')[0].appendChild(openSans);
openSansAdded = true;
}
var font = weight + ' ' + size + ' ' + dom.font.value;
var fillColor = dom.color.value;
var outlineColor = dom.outline.value;
var outlineWidth = parseInt(dom.outlineWidth.value, 10);
return new ol.style.Text({
textAlign: align == '' ? undefined : align,
textBaseline: baseline,
font: font,
text: getText(feature, resolution, dom),
fill: new ol.style.Fill({color: fillColor}),
stroke: new ol.style.Stroke({color: outlineColor, width: outlineWidth}),
offsetX: offsetX,
offsetY: offsetY,
placement: placement,
maxAngle: maxAngle,
overflow: overflow,
rotation: rotation
});
};
// Polygons
function polygonStyleFunction(feature, resolution) {
return new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'blue',
width: 1
}),
fill: new ol.style.Fill({
color: 'rgba(0, 0, 255, 0.1)'
}),
text: createTextStyle(feature, resolution, myDom.polygons)
});
}
var vectorPolygons = new ol.layer.Vector({
source: new ol.source.Vector({
url: 'data/geojson/polygon-samples.geojson',
format: new ol.format.GeoJSON()
}),
style: polygonStyleFunction
});
// Lines
function lineStyleFunction(feature, resolution) {
return new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'green',
width: 2
}),
text: createTextStyle(feature, resolution, myDom.lines)
});
}
var vectorLines = new ol.layer.Vector({
source: new ol.source.Vector({
url: 'data/geojson/line-samples.geojson',
format: new ol.format.GeoJSON()
}),
style: lineStyleFunction
});
// Points
function pointStyleFunction(feature, resolution) {
return new ol.style.Style({
image: new ol.style.Circle({
radius: 10,
fill: new ol.style.Fill({color: 'rgba(255, 0, 0, 0.1)'}),
stroke: new ol.style.Stroke({color: 'red', width: 1})
}),
text: createTextStyle(feature, resolution, myDom.points)
});
}
var vectorPoints = new ol.layer.Vector({
source: new ol.source.Vector({
url: 'data/geojson/point-samples.geojson',
format: new ol.format.GeoJSON()
}),
style: pointStyleFunction
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorPolygons,
vectorLines,
vectorPoints
],
target: 'map',
view: new ol.View({
center: [-8161939, 6095025],
zoom: 8
})
});
document.getElementById('refresh-points')
.addEventListener('click', function() {
vectorPoints.setStyle(pointStyleFunction);
});
document.getElementById('refresh-lines')
.addEventListener('click', function() {
vectorLines.setStyle(lineStyleFunction);
});
document.getElementById('refresh-polygons')
.addEventListener('click', function() {
vectorPolygons.setStyle(polygonStyleFunction);
});
/**
* @param {number} n The max number of characters to keep.
* @return {string} Truncated string.
*/
String.prototype.trunc = String.prototype.trunc ||
function(n) {
return this.length > n ? this.substr(0, n - 1) + '...' : this.substr(0);
};
// http://stackoverflow.com/questions/14484787/wrap-text-in-javascript
function stringDivider(str, width, spaceReplacer) {
if (str.length > width) {
var p = width;
while (p > 0 && (str[p] != ' ' && str[p] != '-')) {
p--;
}
if (p > 0) {
var left;
if (str.substring(p, p + 1) == '-') {
left = str.substring(0, p + 1);
} else {
left = str.substring(0, p);
}
var right = str.substring(p + 1);
return left + spaceReplacer + stringDivider(right, width, spaceReplacer);
}
}
return str;
}