土方量计算，或者叫填挖方计算，体积计算，Skyline在很早的版本中就提供了这个的功能。

目前的软件版本，不仅仅可以对地形修改对象进行土方量计算，还可以在FLY工程中导入DEM数字高程模型数据，计算不同DEM数据之间的土方量变化情况。

这里摘取了针对地形修改对象的土方量计算代码，请大家鉴赏。

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title>剖切指定位置的三维模型</title>

    <script type="text/javascript">

        // ------------------------------------------------------

        // 若加载其他工程文件，可以修改下面一行中fly文件地址

        var flyurl = "E:\\2018\\DEMO\\Default0726.fly";

        // ------------------------------------------------------

        function LoadFly() {

            var sg = CreateSGObj();

            sg.Open(flyurl);

        }

        window.setTimeout("LoadFly()", 1000);

        function StartCal() {

            var SGWorld = CreateSGObj();

            var oid = SGWorld.ProjectTree.FindItem("New Modify Terrain ##5175551");

            CalculateList(oid, null);

        }

        function CalculateList(value, geometry) {

            var SGWorld = CreateSGObj();

            var volumeGeometry;

            var ModifyObj = SGWorld.ProjectTree.GetObject(value);

            if (geometry == null)

                volumeGeometry = ModifyObj.Geometry;

            else

                volumeGeometry = geometry;

            var origVisability = SGWorld.ProjectTree.GetVisibility(value);

            SGWorld.ProjectTree.SetVisibility(value, false);

            calculateVolume(volumeGeometry, 2, 3, 0, ModifyObj.TreeItem.Name);

            SGWorld.ProjectTree.SetVisibility(value, true);

            calculateVolume(volumeGeometry, 2, 3, 1, ModifyObj.TreeItem.Name);

            SGWorld.ProjectTree.SetVisibility(value, origVisability);

        }

        var gAreaUnitFactor = 1;

        var gVolumeUnitFactor = 1;

        var gAreaUnit = "";

        var gVolumeUnit = "";

        var gQuaryResolution = 1024;

        var gVolumeResultHTML = "";

        //-------------

        // calculateVolume

        function calculateVolume(geometry, type, altitudeType, phase, ObjName) {

            var SGWorld = CreateSGObj();

            //debugger

            //var htmlStr;

            //htmlStr = SGLang.i18n("PrepareClaculation");

            //SGWorld.Window.ShowMessageBarText(htmlStr, 1, -1);

            //var qualityStep = ResolutionsArray[$("#DensityID").val()];

            var qualityStep = 10;

            var polygonGeometry = geometry.Clone(); // to enable edit geometry (ref) when geometry type is RelativeToPivot. Navon.

            var envelope = polygonGeometry.Envelope; // Multi polygon evnelope (min/max)

            var MinX = Math.min(envelope.Rings(0).Points(0).x, envelope.Rings(0).Points(2).x);

            var MaxX = Math.max(envelope.Rings(0).Points(0).x, envelope.Rings(0).Points(2).x);

            var MinY = Math.min(envelope.Rings(0).Points(0).y, envelope.Rings(0).Points(2).y);

            var MaxY = Math.max(envelope.Rings(0).Points(0).y, envelope.Rings(0).Points(2).y);

            var stepX = Math.abs(MaxX - MinX) / gQuaryResolution;

            var stepY = Math.abs(MaxY - MinY) / gQuaryResolution;

            // calculate cell 2D size

            var cellPos0 = SGWorld.Creator.CreatePosition(MinX, MaxY, 0, 3, 0, 0, 0, 1);

            var cellPos1 = SGWorld.Creator.CreatePosition(MinX, MaxY - stepY, 0, 3, 0, 0, 0, 1);

            var cellPos2 = SGWorld.Creator.CreatePosition(MinX + stepX, MaxY, 0, 3, 0, 0, 0, 1);

            var cellWidth = cellPos0.DistanceTo(cellPos1) * qualityStep;

            var cellArea = cellPos0.DistanceTo(cellPos1) * cellPos0.DistanceTo(cellPos2) * qualityStep * qualityStep * gAreaUnitFactor;

            if (phase == 0) {

                // For now we call this query several times because of an engine bug!!!

                gElevationBufferBefore = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

                gElevationBufferBefore = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

                gElevationBufferBefore = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

            }

            else {

                // For now we call this query several times because of an engine bug!!!

                gElevationBufferAfter = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

                gElevationBufferAfter = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

                gElevationBufferAfter = SGWorld.Analysis.QueryElevationBuffer(MinX, MaxY, stepX, stepY, gQuaryResolution, gQuaryResolution).toArray();  // MaxX - MinX, MaxY - MinY);

                //// var group;

                //var drawObjects = $("#showObjectsID").is(':checked') ? true : false;

                //if (drawObjects) {

                //    CreateLayer(cellWidth * 100, ObjName);

                //    var result = featureLayerStyles["ImageLabel"](cellWidth / 40, abspath() + "/img/point.png"); // ,"[Color]");

                //}

                //group = SGWorld.ProjectTree.CreateGroup( SGLang.i18n("ToolName"), "");

                var VolumeAdded = 0;

                var VolumeRemoved = 0;

                for (i = qualityStep / 2; i < gQuaryResolution; i = i + qualityStep) {

                    for (j = qualityStep / 2; j < gQuaryResolution; j = j + qualityStep) {

                        var x = MinX + i * stepX;

                        var y = MaxY - j * stepY;

                        var objColor = "#000000";

                        var volumeType = 0;

                        var pointGeometry = SGWorld.Creator.GeometryCreator.CreatePointGeometry([x, y, 0]);

                        if (polygonGeometry.SpatialRelation.Intersects(pointGeometry)) {

                            var elevationDiff = gElevationBufferAfter[j * gQuaryResolution + i] - gElevationBufferBefore[j * gQuaryResolution + i];

                            var volumeDiff = cellArea * elevationDiff * gVolumeUnitFactor;

                            if (elevationDiff > 0) { // Added

                                volumeType = 1;

                                VolumeAdded += Math.abs(volumeDiff);

                                objColor = 65280; //  "#00ff00"; // green

                            }

                            else if (elevationDiff < 0) { // Removed

                                volumeType = 2;

                                VolumeRemoved += Math.abs(volumeDiff);

                                objColor = 255; //  "#ff0000";    // red

                            }

                            else {

                                volumeType = 0;

                                objColor = 0; //  "#000000"; // black

                            }

                            //if (drawObjects) { // && i % ObjInterval == 0 && j % ObjInterval == 0) {

                            //    var pos = SGWorld.Creator.CreatePosition(x, y, gElevationBufferAfter[j * gQuaryResolution + i], 3, 0, 0, 0, 1);

                            //    gLayer.FeatureGroups.Point.CreateFeature([pos.X, pos.Y, pos.Altitude], volumeType + ";" + cellArea.toFixed(3) + ";" + volumeDiff.toFixed(3) + ";" + objColor);

                            //    //SGWorld.Creator.CreateSphere(pos, 2, 0, objColor, objColor, 2, group, "sphere");

                            //}

                        } // if intersect

                    } // for j

                    if (i % 10 == 0) {

                        var progress = (i / gQuaryResolution) * 100;

                        htmlStr = SGLang.i18n("calculatingVolume") + ObjName + ": " + progress.toFixed(0) + "%";

                        SGWorld.Window.ShowMessageBarText(htmlStr, 1, -1);

                    }

                } // for i

                SGWorld.Window.HideMessageBarText();

                gVolumeResultHTML += "<br/><u>" + ObjName + ":</u><br/>" + "objectVolumeAdded" + "<b>" + VolumeAdded.toFixed(3) + "</b> " + gVolumeUnit + "  <br/> " + "objectVolumeRemoved" + "<b>" + VolumeRemoved.toFixed(3) + "</b> " + gVolumeUnit + "<br/>";

                //gTotalVolumeAdded += VolumeAdded;

                //gTotalVolumeRemoved += VolumeRemoved;

                alert(gVolumeResultHTML);

                //if (drawObjects)

                //    gLayer.Save();

            } // phase

            return true;

        }

        // SGWorld70

        function CreateSGObj() {

            try {

                var obj = document.getElementById("SGWorld");

                if (obj == null) {

                    obj = document.createElement('object');

                    obj.setAttribute("name", "SGWorld");

                    obj.setAttribute("id", "SGWorld");

                    obj.style.height = "1px";

                    obj.style.width = "1px";

                    obj.setAttribute("classid", "CLSID:3A4F919C-65A8-11D5-85C1-0001023952C1");

                    document.body.appendChild(obj);

                }

                return obj;

            }

            catch (e) {

                alert(e);

            }

        }

    </script>

</head>

<body style="margin: 0px; border: 0px;">

    <div id="top">

        <div>

            <input id="Button1" type="button" value="分析" style="position:absolute;top:6px;right:100px;" onclick="StartCal()" />

        </div>

    </div>

    <div style="position: absolute; top: 50px; bottom: 0px; width: 100%; background-color: black; margin: 0px; border: 0px; margin-top: 3px;">

        <object id="TerraExplorerInformationWindow" classid="CLSID:3a4f9193-65a8-11d5-85c1-0001023952c1" style="margin-left: 3px; width: 19%; height: 99%;"></object>

        <object id="TerraExplorer3DWindow" classid="CLSID:3a4f9192-65a8-11d5-85c1-0001023952c1" style="width: 80%; height: 99%;"></object>

    </div>

</body>

</html>

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