请注意，下面的代码将创建多边形check here，在这里我想用一些颜色填充我需要做的事情。请在这里协助。我尝试下面的代码它对我来说工作正常，我只需要用一些颜色填充创建的多边形，所以它看起来与谷歌地球相同。
var ge;
google.load("earth", "1");
function init() {
google.earth.createInstance('map3d', initCB, failureCB);
}
function initCB(instance) {
ge = instance;
ge.getWindow().setVisibility(true);
ge.getNavigationControl().setVisibility(ge.VISIBILITY_SHOW);
var alt = 10;
var icons = ['http://maps.google.com/mapfiles/kml/pushpin/wht-pushpin.png', 'http://maps.google.com/mapfiles/kml/pushpin/ltblu-pushpin.png', 'http://maps.google.com/mapfiles/kml/pushpin/blue-pushpin.png'];
var latitude = 40.30010;
var longitude = -94.98570;
for (var i = 0; i < 3; i++) {
// Create the placemark and add it to Earth.
var placemark = ge.createPlacemark('');
// Set the placemark's location.
var point = ge.createPoint('');
point.setLatitude(latitude);
point.setLongitude(longitude);
point.setAltitudeMode(ge.ALTITUDE_ABSOLUTE);
point.setAltitude(alt + i * 7000);
placemark.setGeometry(point);
placemark.setName("From Surface: " + (alt + i * 7000));
// Define a custom icon.
var icon = ge.createIcon('');
icon.setHref(icons[i]);
var style = ge.createStyle(''); //create a new style
style.getIconStyle().setIcon(icon); //apply the icon to the style
placemark.setStyleSelector(style); //apply the style to the placemark
// Add the placemark to Earth.
ge.getFeatures().appendChild(placemark);
}
var la = ge.createLookAt('');
la.set(latitude, longitude, alt, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 0, 200000);
//@latitude,@longitude,@centerPointlatitude,@centerPointlongitude,@polygonType
pm = new Polygon(latitude, longitude, 39.76010, -94.92555, 5);
ge.getView().setAbstractView(la);
}
var pi = Math.PI;
function Polygon(lat, lon, lata, lona, sides) {
var me = this;
me.numsides = sides;
me.cent = new PM(lat, lon, 'centre', 'ff00ffff');
me.rad = new PM(lata, lona, 'outer', 'ff8080ff');
me.setBearDist();
var lineStringPlacemark = ge.createPlacemark('');
me.lineString = ge.createLineString('');
lineStringPlacemark.setGeometry(me.lineString);
// me.lineString.setTessellate(true);
me.lineString.setExtrude(true);
me.lineString.setAltitudeMode(ge.ALTITUDE_RELATIVE_TO_GROUND);
me.drawPolygon();
lineStringPlacemark.setStyleSelector(ge.createStyle(''));
me.lineStyle = lineStringPlacemark.getStyleSelector().getLineStyle();
me.lineStyle.setWidth(3);
me.lineStyle.getColor().set('9900ffff'); // aabbggrr format
//fill color to polygon boundry
var polyStyle = lineStringPlacemark.getStyleSelector().getPolyStyle();
polyStyle.getColor().set('9900ffff');
polyStyle.setFill(1);
polyStyle.setOutline(1);
lineStringPlacemark.getStyleSelector().getPolyStyle().getColor().set('9900ffff');
//end
ge.getFeatures().appendChild(lineStringPlacemark);
google.earth.addEventListener(ge.getGlobe(), "mousemove", function (event) { me.movePMLoc(event); });
google.earth.addEventListener(ge.getGlobe(), "mousedown", function (event) { me.completelyNewLoc(event); });
}
Polygon.prototype.setBearDist = function () {
this.bear = bearing(this.cent.lat, this.cent.lon, this.rad.lat, this.rad.lon);
this.dist = distance(this.cent.lat, this.cent.lon, this.rad.lat, this.rad.lon);
document.getElementById('rad').innerHTML = this.dist.toPrecision(6).toString() + ' km';
document.getElementById('bear').innerHTML = this.bear.toDeg().toPrecision(5).toString() + ' deg';
}
Polygon.prototype.setRad = function () {
var latlon = destination(this.cent.lat, this.cent.lon, this.dist, this.bear);
this.rad.setLoc(latlon[0], latlon[1]);
}
Polygon.prototype.colour = function (col) {
this.lineStyle.getColor().set(col);
}
Polygon.prototype.drawPolygon = function () { // Draw our Polygon
var latlon;
this.lineString.getCoordinates().clear();
for (i = 0; i <= this.numsides; i++) {
latlon = destination(this.cent.lat, this.cent.lon, this.dist, this.bear + i * 2 * pi / this.numsides);
this.lineString.getCoordinates().pushLatLngAlt(latlon[0], latlon[1], 9000);
//here we add altidue
}
this.areaCircum();
}
function PM(lat, lon, name, colour) { // Create Placemark
var me = this;
me.active = false;
me.name = name;
me.placemark = ge.createPlacemark('');
ge.getFeatures().appendChild(me.placemark);
me.point = ge.createPoint('');
me.placemark.setStyleSelector(ge.createStyle(''));
var IconStyle = me.placemark.getStyleSelector().getIconStyle();
IconStyle.getColor().set(colour);
IconStyle.getHotSpot().setXUnits(ge.UNITS_FRACTION);
IconStyle.getHotSpot().setYUnits(ge.UNITS_FRACTION);
IconStyle.getHotSpot().setX(0.5);
IconStyle.getHotSpot().setY(0.5);
me.setLoc(lat, lon);
me.placemark.setGeometry(me.point);
google.earth.addEventListener(me.placemark, "mousedown", function (event) { me.draw(event); });
google.earth.addEventListener(me.placemark, "mouseup", function (event) { me.undraw(event); });
}
PM.prototype.setLoc = function (lat, lon) { // set location of placemark.
this.lat = lat.toRad();
this.lon = lon.toRad();
this.point.setLatLng(lat, lon.fixLon());
document.getElementById(this.name).innerHTML = lat.toPrecision(7).toString() + ' , ' + lon.toPrecision(7).toString();
}
Polygon.prototype.movePMLoc = function (kmlEvent) {
if (!this.rad.active && !this.cent.active) {
this.colour('9900ffff');
}
else {
kmlEvent.preventDefault();
this.colour('9900ffff');
if (this.rad.active) {
this.rad.setLoc(kmlEvent.getLatitude(), kmlEvent.getLongitude());
this.setBearDist();
this.drawPolygon();
}
else { // only pick up centre placemark if vertex placemark not selected
this.cent.setLoc(kmlEvent.getLatitude(), kmlEvent.getLongitude());
this.setRad();
this.drawPolygon();
}
}
}
Polygon.prototype.completelyNewLoc = function (kmlEvent) {
if (kmlEvent.getAltKey()) {
this.cent.active = false;
this.rad.active = true;
this.cent.setLoc(kmlEvent.getLatitude(), kmlEvent.getLongitude());
this.rad.setLoc(kmlEvent.getLatitude(), kmlEvent.getLongitude());
this.colour('9900ffff');
}
}
PM.prototype.draw = function () {
this.active = true;
}
PM.prototype.undraw = function () {
this.active = false;
}
Polygon.prototype.fetchKML = function () {
var URL = "http://www.barnabu.co.uk/cgi-bin/polyplot.cgi"
+ "?lt=" + this.cent.lat.toDeg().toString()
+ "&ln=" + this.cent.lon.toDeg().toString()
+ "&b=" + this.bear.toDeg().toString()
+ "&d=" + this.dist.toString()
+ "&s=" + this.numsides.toString();
window.location = URL;
}
Polygon.prototype.areaCircum = function () { // compute area and circumference of Polygon
var area = 0;
var circum = 0;
var latlon;
if (this.numsides == 25) { // area of spherical circle = 2*pi*R^2*(1-cos(radius))
area = 2 * pi * 6371 * 6371 * (1 - Math.cos(this.dist / 6371));
circum = 2 * pi * 6371 * (Math.sin(this.dist / 6371));
}
else if (this.numsides != 2) { // Spherical Polygon of n sides, theta is sum of internal angles: area = (theta-(n-2)*pi)*R^2
var latlon = destinationr(0, 0, this.dist, pi);
var latlon2 = destinationr(0, 0, this.dist, pi - 2 * pi / this.numsides);
var ang = 2 * bearing(latlon[0], latlon[1], latlon2[0], latlon2[1]);
area = ((this.numsides * ang) - (this.numsides - 2) * pi) * 6371 * 6371;
circum = this.numsides * distance(latlon[0], latlon[1], latlon2[0], latlon2[1]);
}
document.getElementById('per').innerHTML = circum.toPrecision(6).toString() + ' km';
document.getElementById('are').innerHTML = area.toPrecision(8).toString() + ' km<sup>2</sup>';
}
Number.prototype.toRad = function () { // convert degrees to radians
return this * pi / 180;
}
Number.prototype.toDeg = function () { // convert radians to degrees
return this * 180 / pi;
}
Number.prototype.fixLon = function () { // keep longitude in range -180 to 180
lon = this;
while (lon < -180) { lon += 360; }
while (lon > 180) { lon -= 360; }
return parseFloat(lon);
}
///////////////////////////////////////
//
function distance(lata, lona, latb, lonb) { // great circle distance (km)
return Math.acos(Math.sin(lata) * Math.sin(latb) + Math.cos(lata) * Math.cos(latb) * Math.cos(lonb - lona)) * 6371;
}
function bearing(lata, lona, latb, lonb) { // initial great circle bearing (rad)
return Math.atan2(Math.sin(lonb - lona) * Math.cos(latb), Math.cos(lata) * Math.sin(latb) - Math.sin(lata) * Math.cos(latb) * Math.cos(lonb - lona))
}
function destination(lata, lona, dist, brng) { // destination along great circle. returns values in degrees
var latb = Math.asin(Math.sin(lata) * Math.cos(dist / 6371) + Math.cos(lata) * Math.sin(dist / 6371) * Math.cos(brng));
var lonb = lona + Math.atan2(Math.sin(brng) * Math.sin(dist / 6371) * Math.cos(lata), Math.cos(dist / 6371) - Math.sin(lata) * Math.sin(latb));
return [180 * latb / pi, 180 * lonb / pi]
}
function destinationr(lata, lona, dist, brng) { // destination along great circle. returns value in radians
var latb = Math.asin(Math.sin(lata) * Math.cos(dist / 6371) + Math.cos(lata) * Math.sin(dist / 6371) * Math.cos(brng));
var lonb = lona + Math.atan2(Math.sin(brng) * Math.sin(dist / 6371) * Math.cos(lata), Math.cos(dist / 6371) - Math.sin(lata) * Math.sin(latb));
return [latb, lonb]
}
答案 0 :(得分：0)