arcgis 点线面操作
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Label Points</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.9/js/dojo/dijit/themes/tundra/tundra.css" />
<link rel="stylesheet" href="http://js.arcgis.com/3.9/js/esri/css/esri.css" />
<style>
html, body{
padding: 0;
margin: 0;
width: 100%;
height: 100%;
}
</style>
<script>
var dojoConfig = {
packages: [{
name: "myApp",
location: location.pathname.replace(/\/[^/]+$/, "") + "/js/myApp"
}]
};
</script>
<script src="http://js.arcgis.com/3.9/"></script>
<script type="text/javascript">
var map, tb, markerSymbol, lineSymbol, fillSymbol;
var bMapIsDegrees = true;
var geometryService = null;
var displayDistUnits = "Kilometers", displayDistUnitsAbbr = "km";
var displayAreaUnits = "Kilometers", displayAreaUnitsAbbr = "sq km";
var fontFace = "Arial"; require(["dojo/parser", "dijit/registry", "esri/geometry/Point",
"esri/map", "esri/layers/ArcGISTiledMapServiceLayer", "esri/toolbars/draw", "esri/graphic", "esri/SpatialReference",
"esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol",
"esri/symbols/TextSymbol",
"esri/Color", "esri/tasks/ProjectParameters", "esri/tasks/AreasAndLengthsParameters",
"esri/tasks/GeometryService", "myApp/measure",
"dojo/domReady!"],
function (parser, registry, Point, Map, ArcGISTiledMapServiceLayer, Draw, Graphic, SpatialReference,
SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol, TextSymbol, Color, ProjectParameters,
AreasAndLengthsParameters, GeometryService, measure) {
parser.parse(); map = new Map("mapDiv");
var agoServiceURL = "http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer";
var agoLayer = new ArcGISTiledMapServiceLayer(agoServiceURL);
map.addLayer(agoLayer); markerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_X, 25,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_DOT,
new Color([0, 0, 255]), 2)); lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT,
new Color([255, 0, 0]), 2); fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([0, 0, 0]), 2),
new Color([0, 0, 255, 0.5])
); var geometryUrl = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer";
geometryService = new GeometryService(geometryUrl); map.on("load", createToolbar); registry.forEach(function (d) {
if (d.declaredClass === "dijit.form.Button") {
d.on("click", activateTool);
}
}); function createToolbar(themap) {
toolbar = new Draw(map);
toolbar.on("draw-end", addToMap);
} function activateTool() {
var tool = null;
switch (this.label) {
case "点":
tool = "POINT";
break;
case "多点":
tool = "MULTIPOINT";
break;
case "线":
tool = "POLYLINE";
break;
case "徒手线":
tool = "FREEHAND_POLYLINE";
break;
case "多边形":
tool = "POLYGON";
break;
}
toolbar.activate(Draw[tool]);
map.hideZoomSlider();
} function addToMap(evt) {
map.graphics.clear(); var geometry = evt.geometry;
var symbol;
// 将用户绘制的几何对象加入到地图中
switch (geometry.type) {
case "point":
symbol = markerSymbol;
break;
case "multipoint":
symbol = markerSymbol;
break;
case "polyline":
symbol = lineSymbol;
break;
case "polygon":
symbol = fillSymbol;
break;
} var graphic = new Graphic(geometry, symbol);
map.graphics.add(graphic); // 增加标注
addLabel(geometry);
} function addLabel(geometry) {
var x, y, g;
switch (geometry.type) {
case "point":
x = measure.round(geometry.x, 2);
y = measure.round(geometry.y, 2);
g = getPointLabel(x + ", " + y, geometry);
map.graphics.add(g);
break; case "multipoint":
for (var i in geometry.points) {
var coords = geometry.points[i];
x = measure.round(coords[0], 2);
y = measure.round(coords[1], 2);
g = getPointLabel(x + ", " + y, new Point(coords, geometry.spatialReference));
map.graphics.add(g);
}
break; case "polyline":
if (displayDistUnits) {
var length = measure.calculateLength(geometry, bMapIsDegrees);
for (var i in geometry.paths) {
if (bMapIsDegrees) {
mapUnits = "Meters";
}
var len = measure.convertDistanceUnits(length[i], mapUnits, displayDistUnits);
var text = measure.significantDigits(len, 4) + " " + displayDistUnitsAbbr;
g = getPathLabel(text, geometry, i);
map.graphics.add(g);
}
}
break; case "polygon":
if (displayDistUnits || displayAreaUnits) {
var measureFunc = function (result) {
for (var i in result.areas) {
var perimeter = result.lengths[i];
var area = result.areas[i];
// 标注周长
if (displayDistUnits) {
var peri = measure.convertDistanceUnits(perimeter, mapUnits, displayDistUnits);
var text = measure.significantDigits(peri, 4) + " " + displayDistUnitsAbbr;
map.graphics.add(getPathLabel(text, geometry, i));
}
// 标注面积
if (displayAreaUnits) {
var a = measure.convertAreaUnits(area, mapUnits, displayAreaUnits);
text = measure.significantDigits(a, 6) + " " + displayAreaUnitsAbbr;
map.graphics.add(getAreaLabel(text, geometry, i));
}
}
}; var polyGraphic = new Graphic(geometry);
if (bMapIsDegrees) {
mapUnits = "Meters";
var outSR = new SpatialReference({
wkid: 54034 //World_Cylindrical_Equal_Area
});
var params = new ProjectParameters();
params.geometries = [geometry];
params.outSR = outSR; geometryService.project(params, function (geometries) {
var areasAndLengthParams = new AreasAndLengthsParameters();
areasAndLengthParams.lengthUnit = GeometryService.UNIT_METER;
areasAndLengthParams.areaUnit = GeometryService.UNIT_SQUARE_METERS;
areasAndLengthParams.polygons = geometries;
geometryService.areasAndLengths(areasAndLengthParams, measureFunc);
});
}
else {
geometryService.areasAndLengths([geometry], measureFunc);
}
}
break;
}
} function getFont() {
var size = 10;
var f = new esri.symbol.Font(size + "pt",
esri.symbol.Font.STYLE_NORMAL,
esri.symbol.Font.VARIANT_NORMAL,
esri.symbol.Font.WEIGHT_BOLD,
fontFace);
return f;
} function getPointLabel(text, point) {
var sym = new TextSymbol(text, getFont(), new Color([255, 0, 0]));
sym.setAlign(TextSymbol.ALIGN_START);
var g = new Graphic(point, sym);
return g;
} function getPathLabel(text, polyline, pathIndex) {
try {
var sym = new TextSymbol(text, getFont(), new Color([255, 0, 0]));
if (polyline.paths) {
var path = polyline.paths[pathIndex];
}
else {
var path = polyline.rings[pathIndex];
}
var idx = Math.floor(path.length / 2);
var p1 = polyline.getPoint(pathIndex, idx - 1);
var p2 = polyline.getPoint(pathIndex, idx);
var point = measure.getMidPoint(p1, p2);
var angle = measure.getAngle(p1, p2);
sym.setAngle(angle);
sym.setOffset(0, 2);
var g = new Graphic(point, sym);
return g;
}
catch (err) {
console.error("创建标注出错：", err);
}
} function getAreaLabel(text, polygon, ringIndex) {
try {
var sym = new TextSymbol(text, getFont(), new Color([255, 0, 0]));
var point = measure.getRingExtent(polygon, ringIndex).getCenter();
var g = new Graphic(point, sym);
return g;
}
catch (err) {
console.error("创建面积标注出错：", err);
}
}
}
);
</script>
</head> <body class="tundra">
<button data-dojo-type="dijit/form/Button">点</button>
<button data-dojo-type="dijit/form/Button">多点</button>
<button data-dojo-type="dijit/form/Button">线</button>
<button data-dojo-type="dijit/form/Button">徒手线</button>
<button data-dojo-type="dijit/form/Button">多边形</button>
<div id="mapDiv" style="width:900px; height:600px; border:1px solid #000;"></div>
</body>
</html>
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