define(["esri/geometry/Point", "esri/geometry/Extent"], function (Point, Extent) {
var measure = {};
measure.getMidPoint = function (p1, p2) {
var theReturn = null;
if (p1 && p1.type && p1.type == "point" && p2 && p2.type && p2.type == "point") {
var x = (p1.x + p2.x) / 2;
var y = (p1.y + p2.y) / 2;
theReturn = new Point(x, y, p1.spatialReference);
}
return theReturn;
};
measure.getAngle = function (p1, p2) {
var theReturn = 0;
if (p1 && p1.type && p1.type == "point" && p2 && p2.type && p2.type == "point") {
var dx = (p1.x - p2.x);
var dy = (p1.y - p2.y);
var rad = Math.PI / 2;
if (dx !== 0) {
rad = Math.atan(dy / dx) * -1;
}
theReturn = measure.radiansToDegrees(rad);
}
return theReturn;
};
measure.radiansToDegrees = function (radians) {
return radians * 180 / Math.PI;
};
measure.getRingExtent = function (polygon, ringIndex) {
var ext = null;
if (polygon && polygon.type && polygon.type == "polygon") {
var minX = null;
var maxX = null;
var minY = null;
var maxY = null;
for (var j = 0; j < polygon.rings[ringIndex].length; j++) {
x = polygon.rings[ringIndex][j][0];
y = polygon.rings[ringIndex][j][1];
if (minX) {
minX = Math.min(minX, x);
}
else {
minX = x;
}
if (minY) {
minY = Math.min(minY, y);
}
else {
minY = y;
}
if (maxX) {
maxX = Math.max(maxX, x);
}
else {
maxX = x;
}
if (maxY) {
maxY = Math.max(maxY, y);
}
else {
maxY = y;
}
}
ext = new Extent(minX, minY, maxX, maxY, polygon.spatialReference);
}
return ext;
};
measure.calculateLength = function (polyline, isGeographic) {
var length = [];
if (polyline && polyline.type && polyline.type == "polyline") {
for (var i in polyline.paths) {
var l = 0;
for (var j = 0; j < polyline.paths[i].length - 1; j++) {
var x1 = polyline.paths[i][j][0];
var y1 = polyline.paths[i][j][1];
var x2 = polyline.paths[i][j + 1][0];
var y2 = polyline.paths[i][j + 1][1];
var d;
if (isGeographic) {
d = measure.getGreatCircleDistance2(y1, x1, y2, x2);
}
else {
d = measure.getDistanceXYXY(x1, y1, x2, y2);
}
l += d;
}
length.push(l);
}
}
return length;
};
measure.getDistanceXYXY = function (x1, y1, x2, y2) {
return Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
};
measure.getGreatCircleDistance2 = function (/*Number*/lat1, /*Number*/lon1, /*Number*/lat2, /*Number*/lon2) {
try {
var rlat1 = measure.degreesToRadians(lat1);
var rlon1 = measure.degreesToRadians(lon1);
var rlat2 = measure.degreesToRadians(lat2);
var rlon2 = measure.degreesToRadians(lon2);
var ellipse = {
name: "WGS80",
a: 6378.137 / 1.852,
invf: 298.257223563
};
// Some util functions
var mod = function (x, y) {
return x - y * Math.floor(x / y);
};
var modcrs = function (x) {
return mod(x, 2 * Math.PI);
};
var a = ellipse.a;
var f = 1 / ellipse.invf;
var r, tu1, tu2, cu1, su1, cu2, s1, b1, f1;
var x, sx, cx, sy, cy, y, sa, c2a, cz, e, c, d;
var EPS = 0.00000000005;
var faz, baz, s;
var iter = 1;
var MAXITER = 100;
if ((rlat1 + rlat2 === 0.0) && (Math.abs(rlon1 - rlon2) == Math.PI)) {
alert("Course and distance between antipodal points is undefined");
rlat1 = rlat1 + 0.00001; // allow algorithm to complete
}
if (rlat1 == rlat2 && (rlon1 == rlon2 || Math.abs(Math.abs(rlon1 - rlon2) - 2 * Math.PI) < EPS)) {
//console.warn("Points 1 and 2 are identical- course undefined");
return 0;
}
r = 1 - f;
tu1 = r * Math.tan(rlat1);
tu2 = r * Math.tan(rlat2);
cu1 = 1.0 / Math.sqrt(1.0 + tu1 * tu1);
su1 = cu1 * tu1;
cu2 = 1.0 / Math.sqrt(1.0 + tu2 * tu2);
s1 = cu1 * cu2;
b1 = s1 * tu2;
f1 = b1 * tu1;
x = rlon2 - rlon1;
d = x + 1; // force one pass
while ((Math.abs(d - x) > EPS) && (iter < MAXITER)) {
iter = iter + 1;
sx = Math.sin(x);
cx = Math.cos(x);
tu1 = cu2 * sx;
tu2 = b1 - su1 * cu2 * cx;
sy = Math.sqrt(tu1 * tu1 + tu2 * tu2);
cy = s1 * cx + f1;
y = measure.atan2(sy, cy);
sa = s1 * sx / sy;
c2a = 1 - sa * sa;
cz = f1 + f1;
if (c2a > 0.0) {
cz = cy - cz / c2a;
}
e = cz * cz * 2.0 - 1.0;
c = ((-3.0 * c2a + 4.0) * f + 4.0) * c2a * f / 16.0;
d = x;
x = ((e * cy * c + cz) * sy * c + y) * sa;
x = (1.0 - c) * x * f + rlon2 - rlon1;
}
faz = modcrs(measure.atan2(tu1, tu2));
baz = modcrs(measure.atan2(cu1 * sx, b1 * cx - su1 * cu2) + Math.PI);
x = Math.sqrt((1 / (r * r) - 1) * c2a + 1);
x += 1;
x = (x - 2.0) / x;
c = 1.0 - x;
c = (x * x / 4.0 + 1.0) / c;
d = (0.375 * x * x - 1.0) * x;
x = e * cy;
s = ((((sy * sy * 4.0 - 3.0) * (1.0 - e - e) * cz * d / 6.0 - x) * d / 4.0 + cz) * sy * d + y) * c * a * r;
var out = {};
out.d = s;
out.dist = s * 1852; // to meters
out.crs12 = faz;
out.crs21 = baz;
if (Math.abs(iter - MAXITER) < EPS) {
alert("Algorithm did not converge");
}
return out.dist;
}
catch (err) {
console.error("Error calculating great circle distance", err);
return 0;
}
};
measure.degreesToRadians = function (degrees) {
return Math.PI * degrees / 180;
};
measure.atan2 = function (y, x) {
var out;
if (x < 0) { out = Math.atan(y / x) + Math.PI; }
if ((x > 0) && (y >= 0)) { out = Math.atan(y / x); }
if ((x > 0) && (y < 0)) { out = Math.atan(y / x) + 2 * Math.PI; }
if ((x === 0) && (y > 0)) { out = Math.PI / 2; }
if ((x === 0) && (y < 0)) { out = 3 * Math.PI / 2; }
if ((x === 0) && (y === 0)) {
console.error("com.esri.solutions.jsviewer.util.atan2(0,0) undefined");
out = 0.0;
}
return out;
};
measure.convertDistanceUnits = function (distance, fromUnits, toUnits) {
if (fromUnits == "DecimalDegrees") {
console.error("convertDistanceUnits: DecimalDegrees are not a distance unit");
return 0;
}
// Number of meters in a unit
var cFactors = {
"Feet": 0.3048,
"Meters": 1,
"Miles": 1609.344,
"Kilometers": 1000,
"Yards": 0.9144
};
if (!cFactors[fromUnits]) {
console.error("convertDistanceUnits: Unknown units '" + fromUnits + "'");
return 0;
}
if (!cFactors[toUnits]) {
console.error("convertDistanceUnits: Unknown units '" + toUnits + "'");
return 0;
}
// Convert to meters
var dInMeters = distance * cFactors[fromUnits];
// Convert to output units
var convDistance = dInMeters / cFactors[toUnits];
return convDistance;
};
measure.convertAreaUnits = function (area, fromUnits, toUnits) {
if (fromUnits == "DecimalDegrees") {
console.error("convertDistanceUnits: DecimalDegrees are not an area unit");
return 0;
}
// Number of square meters in a unit
var cFactors = {
"Feet": 0.09290304,
"Meters": 1,
"Miles": 2589988.11,
"Kilometers": 1000000,
"Yards": 0.83612736,
"Acres": 4046.85642,
"Hectares": 10000
};
if (!cFactors[fromUnits]) {
console.error("convertAreaUnits: Unknown units '" + fromUnits + "'");
return 0;
}
if (!cFactors[toUnits]) {
console.error("convertAreaUnits: Unknown units '" + toUnits + "'");
return 0;
}
// Convert to meters
var aInMeters = area * cFactors[fromUnits];
// Convert to output units
var convArea = aInMeters / cFactors[toUnits];
return convArea;
};
measure.significantDigits = function (number, numSignificantDigits) {
var text = number + "";
//console.debug("significantDigits(" + text + ", " + numSignificantDigits + ")");
var output = "";
var bCounting = false;
var count = 0;
var bFoundDot = false;
for (var i = 0; i < text.length; i++) {
var char = text.substr(i, 1);
bFoundDot = bFoundDot || char == ".";
bCounting = bCounting || (char != "-" && char != "." && char != "0");
if (bCounting && char != ".") {
count++;
}
if (count == numSignificantDigits) {
if (char == ".") {
break;
}
if (i == text.length - 1) {
output += char;
}
else {
var next = text.substr(i + 1, 1);
if (next == ".") {
next = text.substr(i + 2, 1);
}
var frag = char + "." + next;
output += Math.round(parseFloat(frag));
}
}
else if (count > numSignificantDigits) {
if (bFoundDot) {
break;
}
else {
output += 0;
}
}
else {
output += char;
}
}
//console.debug(output);
if (output.length > 0) {
output = parseFloat(output);
}
return output;
};
measure.round = function (number, numPlaces) {
//console.debug("round(" + number + ", " + numPlaces + ")");
if (!numPlaces) { numPlaces = 0; }
if (numPlaces > 5) { numPlaces = 5; }
if (numPlaces < -5) { numPlaces = -5; }
numPlaces = Math.round(numPlaces);
//console.debug("rounding " + number + " to " + numPlaces + " places");
var factor = Math.pow(10, numPlaces);
return Math.round(number * factor) / factor;
};
return measure;
});
View Code
<!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_CIRCLE, 10, /**点符号**/
new SimpleLineSymbol(SimpleLineSymbol.STYLE_CIRCLE,
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 = 18;
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([0, 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([0, 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([0, 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="900px; height:600px; border:1px solid #000;"></div>
</body>
</html>
