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天际线效果：
示例代码：
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>ToolTitle</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="StyleSheet" href="../Style.css" type="text/css"> <style> </style> </head> <body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" style="border: 0px" id="Body" class="hideUntillTranslated" onload="Init()"> <!--oncontextmenu="return false;"> onclick="bHide=true;HideOptionsNow()" > --> <table border="0" width="100%" cellspacing="0" cellpadding="2"> <tr> <td class="ToolTopArea" id="TopAreaTD" width="100%" valign="middle" > <table border="0" width="100%" cellspacing="0" cellpadding="0"> <tr> <td width="55px"><img style="margin-left:5px;" src="ToolIcon.png" alt="" /></td> <td id="TitleTD" align="center" class="s12w i18n">ToolName</td> <td align="right" id="CloseHelpTd"><img style="margin-right:5px;" alt="" src="../CommonImg/help.png" border="0" class="i18n" alt="help" title="help" onclick="DisplayHelpPopup6(SGLang.i18nFile(‘help.html‘),SGLang.i18n(‘help‘))" style="cursor: pointer;"></td> </tr> </table> </td> </tr> <tr> <td class="ToolTopSeperator"></td> </tr> <tr class="s8"> <td > <table class="PropertiesSheet" cellspacing="0" cellpadding="2" > <tr class=‘TableOtherLine‘> <td class="s8b"> <label class="i18n">Text7</label> </td> <td align="left"> <select id="OutputTypeID" onchange="TypeChanged();" > <option class="i18n" value=0 selected="selected">Text8</option> <option class="i18n" value=1 >Text9</option> <option class="i18n" value=2 >Text10</option> </select> </td> </tr> <tr > <td class="s8b"> <label class="i18n">Text4</label> </td> <td align="left"> <select id="AccuracyID" > <option class="i18n" value=0 selected="selected">Text5</option> <option class="i18n" value=1 >Text6</option> </select> </td> </tr> <tr class=‘TableOtherLine‘> <!--Radius--> <td class="s8b"> <label class="i18n">Text12</label> </td> <td align="left"> <input id="radiusID" type="text" value="1000" onchange="ValidateInput();" /> <span class="i18n">Text13</span> </td> </tr> <tr> <!--Viewer Altitude--> <td class="s8b"> <label class="i18n">Text16</label> </td> <td align="left"> <input id="ViewerAltitudeID" type="text" value="5" /> <span class="i18n">Text13</span> </td> </tr> <tr class=‘TableOtherLine‘> <!-- Elevation Angle--> <td class="s8b"> <label class="i18n">Text22</label> </td> <td align="left"> <input id="ElevationAngleID" type="text" value="0" onchange="ValidateInput();" /> <span class="i18n">Text34</span> </td> </tr> </table> </td> </tr> <tr > <td colspan="2" align="center" class="ToolButtonsArea"> <button id="Draw" class="MenuButton" onclick="CreateObjects(1);"> <img src="img/SetPoint.png" /><br /> <span class="i18n">Text20</span></button> <button id="groupButton" class="MenuButton" onclick="SelectGroupClipboard(0)"><img src="../commonimg/group.png" /><br /><span class="i18n">Text14</span></button> <button id="clipboardButton" class="MenuButton" onclick="SelectGroupClipboard(1)"><img src="../commonimg/Clipboard.png" /><br /><span class="i18n">Text15</span></button> <div id="ProfileID" style="display:none;"> <button class="MenuButton MenuButtonLast" onclick="ShowProfile();"><img src="img/profile.png" /><br /><span class="i18n">Text18</span></button> </div> </td> </tr> </table> <object id="SGWorld" classid="CLSID:3a4f9199-65a8-11d5-85c1-0001023952c1"> </object> <script language="javascript" src="../ToolsCommon65.js"></script> <script language="JavaScript"> var gCircle = null; var gViewshed = null; var gLayer; var gType = 0; //var gPositionsArray = []; var gDomePoints=[]; var gLineArray = []; var gRingArray = []; var gRingList = []; //var gElevationRingArray = []; var gYawArray = []; var gRingObj = null; var gColorArray = ["#ff0000", "#00ff00", "#0000FF", "#FF00FF", "#C0FFFF", "#FFFF00", "#FFC119", "#B16CF8", "#D2FF01", "#AD8943"]; var gPopupCaption = ""; var gLineIndex = 0; var gMainGroup = null; var gGroup = null; var gVisibilityDistance; var gInEdit = 0; var gOriginalPosition = null; var yawStep ; var pitchStep; var gNumDome = 1; //-------------- // Init function Init() { if (GetParamValue("inSG", "") == "1") { $("#TopAreaTD").attr("height", "57"); $("#TitleTD").attr("align", "left"); $("#CloseHelpTd").attr("display", "none"); } } //------------------ // Reset //------------------ function Reset(FirstTime, FromMouseInputMode) { try { if (gCircle != null) SGWorld.Creator.DeleteObject(gCircle.ID); if (gViewshed != null) SGWorld.Creator.DeleteObject(gViewshed.ID); } catch (e) { } gType = 0; gCircle = null; gViewshed = null; gLayer = null; gGroup = null; gOriginalPosition = null; //gPositionsArray = []; gLineArray = []; gRingArray = []; // gElevationRingArray = []; gYawArray = []; gLineIndex = 0; $("#Draw").removeClass("MenuButtonHighlight"); $("#groupButton").removeClass("MenuButtonHighlight"); $("#clipboardButton").removeClass("MenuButtonHighlight"); SGWorld.ProjectTree.EnableRedraw(1); SGWorld.Window.HideMessageBarText(); if (gInEdit>0) { SGWorld.DetachEvent("OnLButtonClicked", OnLButtonClicked); SGWorld.DetachEvent("OnRButtonUp", OnRButtonUp); SGWorld.DetachEvent("OnFrame", OnFrame); SGWorld.DetachEvent("OnInputModeChanged", OnInputModeChanged); } gInEdit = 0; if (FirstTime != 1 && FromMouseInputMode == 0) SGWorld.Window.SetInputMode(0); } //-------------- // CreateObjects //-------------- function CreateObjects(method) { if (gInEdit==0) { gInEdit = 1; gNumDome = 1; gRingArray = []; gRingList = []; SGWorld.AttachEvent("OnLButtonClicked", OnLButtonClicked); SGWorld.AttachEvent("OnRButtonUp", OnRButtonUp); SGWorld.AttachEvent("OnFrame", OnFrame); SGWorld.AttachEvent("OnInputModeChanged", OnInputModeChanged); SGWorld.Window.SetInputMode(1, abspath() + "/cursor_m.cur", true); SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text23")); $(event.srcElement).addClass("MenuButtonHighlight"); try { var a = SGWorld.ProjectTree.GetItemName(gMainGroup); } catch (e) { gMainGroup = SGWorld.ProjectTree.CreateGroup(SGLang.i18n("ToolName"), SGWorld.ProjectTree.RootID); } var pos = SGWorld.Creator.CreatePosition(0, 0, 0, 0, 0, 0, 0, 0); gCircle = SGWorld.Creator.CreateCircle(pos, $("#radiusID").val(), SGWorld.Creator.CreateColor(255, 0, 0, 255), SGWorld.Creator.CreateColor(255, 255, 255, 100), gMainGroup, SGLang.i18n("Text24")); gCircle.NumberOfSegments = 50; gCircle.LineStyle.Width = -5; } else { Reset (false,false); } } //----------- // SelectGroupClipboard function SelectGroupClipboard(searchType) { if (searchType == 0) { var node = SGWorld.ProjectTree.GetNextItem("", 10); if (node == 0 || !(SGWorld.ProjectTree.IsGroup(node) || SGWorld.ProjectTree.IsLayer(node))) { alert(SGLang.i18n("Text32")); return; } } $(event.srcElement).addClass("MenuButtonHighlight"); SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text31")); gNumDome = 1; gDomePoints = []; gRingArray = []; gRingList = []; if (searchType == 0) searchGeometries2(node, AddDomeToList); if (searchType == 1) searchGeometriesClipboard(AddDomeToList); var CreateTheObjects = true; if (gDomePoints.length > 10) CreateTheObjects = confirm(SGLang.i18n("Text35") + gDomePoints.length + SGLang.i18n("Text36")); if (CreateTheObjects) for (var i = 0; i < gDomePoints.length; i++) CalculateDome (gDomePoints[i].pos, gDomePoints[i].objType, gDomePoints[i].AltitudeType); Reset(0, 0); } //------------ // OnLButtonClicked function OnLButtonClicked(Flags, X, Y) { if (gInEdit == 0) return; var CursorCoord = SGWorld.Window.pixelToWorld(X, Y, 1 + 16 + 64 + 128 + 8192); if (CursorCoord == null) return false; if (gInEdit == 1) // First click, center point { var viewerAltitude = 1.0*$("#ViewerAltitudeID").val(); CursorCoord.Position.Altitude = CursorCoord.Position.Altitude + viewerAltitude; gCircle.Position = CursorCoord.Position.Copy(); if (gCircle != null) { CalculateDome(gCircle.Position, 18, 3); //supported types: 18 = label, 24 = image label } } } //------------ // OnRButtonUp function OnRButtonUp(Flags, X, Y) { if (gInEdit == 0) return; Reset(false, false); } //------------ // OnFrame function OnFrame() { if (gInEdit != 1) return; try { var mouseInfo = SGWorld.Window.GetMouseInfo(); var CursorCoord = SGWorld.Window.pixelToWorld(mouseInfo.X, mouseInfo.Y, 1 + 16 + 64 + 128 + 8192); if (CursorCoord == null) return false; var viewerAltitude = 1.0 * $("#ViewerAltitudeID").val(); CursorCoord.Position.Altitude = CursorCoord.Position.Altitude + viewerAltitude; gCircle.Position = CursorCoord.Position.Copy(); gCircle.Radius = $("#radiusID").val(); } catch (e) { } } //------------ // OnInputModeChanged function OnInputModeChanged(NewMode) { if (NewMode != 1) if (gInEdit != 0) Reset(0, 1); } //--------- //AddDomeToList function AddDomeToList(pos, objType, AltitudeType) { gDomePoints.push({ pos: pos, objType: objType, AltitudeType: AltitudeType }); return true; } //--------- //CalculateDome function CalculateDome(pos, objType, AltitudeType) { if (objType != 0 && objType != 18 && objType != 24) return true; try { ValidateInput(); // Houre glass cursor SGWorld.Window.SetInputMode(1, abspath() + "/hourglass.cur", true); var position = pos.Copy(); // to make sure we do not change the position of an object // Make sure the point altitude is not lower than the Viewer Altitude the user provided var viewerAltitude = 1.0 * $("#ViewerAltitudeID").val(); position.ChangeAltitudeType(3); var groundHeight = SGWorld.Terrain.GetGroundHeightInfo(position.X, position.Y, 1, true); position.Altitude = Math.max(groundHeight.Position.Altitude + viewerAltitude, position.Altitude); if (AnalyzePoints(position)) DrawPoints(position); if (gLayer != null) { gLayer.Save(); } Reset(false, false); gNumDome++; } catch (e) {alert(e.description);} return true; } //------------ // AnalyzePoints function AnalyzePoints(position) { var radius = $("#radiusID").val(); var ElevationAngle = 1.0 * $("#ElevationAngleID").val(); var pos = null; var pointIndex = 0; var lastVisiblePos; gType = $("#OutputTypeID").val(); gVisibilityDistance = radius*20; // Create the Viewshed SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text31") + " [" + gNumDome + "]", -1); gViewshed = SGWorld.Analysis.Create3DViewshed(position, 360, 180, radius*1.01, SGWorld.ProjectTree.HiddenGroupID, SGLang.i18n("Text25")); // HiddenGroupID gViewshed.Quality = 2; gViewshed.SaveInFlyFile = false; SGWorld.Analysis.StartViewshedVisibilityQuery(gViewshed.ID); // calculate ray accuracy var raySteps = Math.floor((Math.log(radius) * 5) / Math.LN10) + 4; if ($("#AccuracyID").val() == 0) { // Normal yawStep = 2; pitchStep = 0.1; } else { // high yawStep = 1; pitchStep = 0.05; } // dome or base if (gType == 0 || gType == 1 ) { // Dome || Base for (var yaw = 0; yaw < 360; yaw += yawStep ) { SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text26") + " [" + gNumDome + "] " + Math.floor((yaw * 100) / (360)) + "%", -1); pointIndex = 0; var numVisiblePoint = 0; gLineArray[gLineIndex] = []; var bFoundVisible = true; pointIndex = AddPoint(gLineIndex, pointIndex, position); // add point at the center gYawArray[gLineIndex] = yaw; for (var pitch = ElevationAngle; pitch <= 90; pitch += pitchStep) { pos = position.Move(radius, yaw, pitch); var PointVisible = SGWorld.Analysis.QueryVisibilityDistance(pos); // Returns the radius of the visibility from the viewer to the position point if (PointVisible >= radius ) { // visible if (numVisiblePoint > 1 && numVisiblePoint % 20 != 0) // reduce number of point on the outer dome pointIndex -= 1; pointIndex = AddPoint(gLineIndex, pointIndex, pos); if (bFoundVisible) AddRing(gLineIndex, pos); bFoundVisible = false; if (gType == 1) break; numVisiblePoint++; } else { pos = position.Move(PointVisible, yaw, pitch); pointIndex = AddPoint(gLineIndex, pointIndex, pos); numVisiblePoint = 0; } } gLineIndex++; } // yaw } // if dome|base else if (gType == 2) { // Skyline for (var yaw = 0; yaw < 360; yaw += yawStep/4 ) { SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text26") + " [" + gNumDome + "] " + Math.floor((yaw * 100) / (360)) + "%", -1); var bAllVisible = true; for (var pitch = 90; pitch >= -45; pitch -= pitchStep ) { pos = position.Move(radius, yaw, pitch); var PointVisible = SGWorld.Analysis.QueryVisibilityDistance(pos); // Returns the radius of the visibility from the viewer to the position point if (PointVisible < radius && PointVisible > -1) { // not visible bAllVisible = false; pos = position.Move(PointVisible, yaw, pitch); AddRing(gLineIndex, pos); break; } } // pitch if (bAllVisible) { // add point to the border line AddRing(gLineIndex, pos); } gLineIndex++; } // yaw } // close the ring var ringFirstPoint = SGWorld.Creator.CreatePosition(gRingArray[0], gRingArray[1], gRingArray[2], 0, 0, 0, 0, 0); AddRing(gLineIndex, ringFirstPoint); SGWorld.Analysis.EndVisibilityQuery(); return true; } //------------ // AddPoint function AddPoint(line, point, position) { gLineArray[line][point * 3] = position.X; gLineArray[line][point * 3 + 1] = position.Altitude; gLineArray[line][point * 3 + 2] = position.Y; point++; return point; } //------------- // AddRing function AddRing(point, position) { gRingArray[point * 3] = position.X; gRingArray[point * 3 + 1] = position.Y; gRingArray[point * 3 + 2] = position.Altitude; } //------------ // DrawPoints function DrawPoints(position) { var radius = $("#radiusID").val(); try { var a = SGWorld.ProjectTree.GetItemName(gMainGroup); } catch (e) { gMainGroup = SGWorld.ProjectTree.CreateGroup(SGLang.i18n("ToolName"), SGWorld.ProjectTree.RootID); } try { var layerName = $("#OutputTypeID option:selected").text()+" ["+gNumDome+"]"; gGroup = SGWorld.ProjectTree.CreateGroup(layerName, gMainGroup); // Viewer label var labelStyle = SGWorld.Creator.CreateLabelStyle(0); var CenterLabel = SGWorld.Creator.CreateImageLabel(position, abspath() + "./img/image11.gif", labelStyle, gGroup, SGLang.i18n("Text11")); CenterLabel.Action.Code = 11; CenterLabel.Style.Scale = radius/100; CenterLabel.Style.IconColor.FromHTMLColor (gColorArray[(gNumDome-1) % 10]); // Dome if (gType == 0 || gType == 1 ) { // dome || Base || elevation rings for (var i = 0; i < gLineIndex; i++) { DrawObject(gLineArray[i], radius, gYawArray[i], gType); } } /****** // Elevation Rings if (gType == 3) { // dome or Base for (var alt = -10; alt < 100; alt++) gElevationRingArray[alt] = []; for (var i = 0; i < gLineIndex; i++) { for (var j = 0; j < gLineArray[i].length / 3 - 1; j++) { var pointA = gLineArray[i][j * 3 + 1]; var pointB = gLineArray[i][(j + 1) * 3 + 1]; if (Math.floor(pointA / 100) != Math.floor(pointB / 100)) { var positionA = SGWorld.Creator.CreatePosition(gLineArray[i][j * 3 ], gLineArray[i][j * 3 + 2], gLineArray[i][j * 3 + 1], 3, 0, 0, 0, 0); var positionB = SGWorld.Creator.CreatePosition(gLineArray[i][(j + 1) * 3 ], gLineArray[i][(j + 1) * 3 + 2], gLineArray[i][(j + 1) * 3 + 1], 3, 0, 0, 0, 0); var l = positionA.DistanceTo(positionB); var l1 = (l * (Math.floor(pointB / 100) * 100 - pointA)) / (pointB - pointA); var positionC = positionA.MoveToward(positionB, l1); gElevationRingArray[Math.floor(pointB / 100)].push(positionC.X, positionC.Altitude, positionC.Y); } } } for (var alt = -10; alt < 100; alt++) { if (gElevationRingArray[alt].length > 3) // at least two points DrawObject(gElevationRingArray[alt], radius, alt); } } ******/ // Outer ring gRingObj = SGWorld.Creator.CreatePolylineFromArray(gRingArray, gColorArray[(gNumDome - 1) % 10], 3, gGroup, SGLang.i18n("Text21")); gRingObj.LineStyle.Width = -3; gRingObj.Visibility.MaxVisibilityDistance = radius * 50; gRingList.push(gRingObj); $("#ProfileID").show(); $("#ProfileID").css(‘display‘,‘inline‘); } catch (e) { alert(e.message); Reset(false, false); } return true; } //--------- // DrawObject function DrawObject(LineArray, range, Yaw, gType) { var node; var TEObj; var scale = range * 50; var ObjType; // = "ImageLabel"; if (gType == 0) ObjType = "Polygon"; else ObjType = "Polyline"; SGWorld.Window.ShowMessageBarText(SGLang.i18n("Text27")+" ["+gNumDome+"]"); if (gLayer == null) { CreateGroupOrLayer(ObjType); // style the feature group if (featureLayerStyles[ObjType] != null) { var result = featureLayerStyles[ObjType](scale); if (result === false) return false; } } if (ObjType == "Polygon") gLayer.FeatureGroups.Polygon.CreateFeature(LineArray, range + ";" + Yaw); if (ObjType == "Polyline") gLayer.FeatureGroups.Polyline.CreateFeature(LineArray, range + ";" + Yaw); return true; } //---------- // CreateGroupOrLayer function CreateGroupOrLayer(ObjType) { var radius = $("#radiusID").val(); if (gLayer == null) { var postfix = new Date().getTime(); var layerName = $("#OutputTypeID option:selected").text() + postfix; if (ObjType == "Polygon") gLayer = SGWorld.Creator.CreateNewFeatureLayer(layerName, LayerGeometryType.LGT_POLYGON, "FileName=ThreatDome" + postfix + ".shp;TEPlugName=OGR;", gGroup); if (ObjType == "Polyline") gLayer = SGWorld.Creator.CreateNewFeatureLayer(layerName, LayerGeometryType.LGT_POLYLINE, "FileName=ThreatDome" + postfix + ".shp;TEPlugName=OGR;", gGroup); // gLayer = SGWorld.Creator.CreateNewFeatureLayer(layerName, LayerGeometryType.LGT_POINT, "FileName=ThreatDome" + postfix + ".shp;TEPlugName=OGR;", gGroup); gLayer.Streaming = true; gLayer.BlockWidth = radius /4; gLayer.Refresh(); ///gLayer.DataSourceInfo.Attributes.CreateAttribute(SGLang.i18n("Text29"), 1, 20, 0); gLayer.DataSourceInfo.Attributes.CreateAttribute(SGLang.i18n("Text30"), 1, 20, 0); gLayer.DataSourceInfo.Attributes.CreateAttribute(SGLang.i18n("Text33"), 2, 20, 1); gLayer.DataSourceInfo.Attributes.ImportAll = true; gLayer.Visibility.MaxVisibilityDistance = gVisibilityDistance; } } var featureLayerStyles = { "Polygon": function (size) { gLayer.FeatureGroups.Polygon.SetProperty("Line Color", "#ffffff"); gLayer.FeatureGroups.Polygon.SetProperty("Line Opacity", 0.5); gLayer.FeatureGroups.Polygon.SetProperty("Fill Opacity", 0); gLayer.FeatureGroups.Polygon.SetProperty("Altitude Method", 11); gLayer.Visibility.MaxVisibilityDistance = size; }, "Polyline": function (size) { gLayer.FeatureGroups.Polyline.SetProperty("Line Color", "#ffffff"); gLayer.FeatureGroups.Polyline.SetProperty("Line Opacity", 0.5); gLayer.FeatureGroups.Polyline.SetProperty("Altitude Method", 11); gLayer.Visibility.MaxVisibilityDistance = size; } } //--------------- // TypeChanged function TypeChanged() { gType = $("#OutputTypeID").val(); if (gType == 2) // Skyline $("#ElevationAngleID").attr(‘disabled‘,‘disabled‘); else $("#ElevationAngleID").attr(‘disabled‘, ‘‘); } //--------------- // ValidateInput function ValidateInput() { var radius = $("#radiusID").val(); radius = Math.max(radius, 0.1); $("#radiusID").val(radius); var ElevationAngle = $("#ElevationAngleID").val(); ElevationAngle = Math.max(Math.min(ElevationAngle, 80), -90); $("#ElevationAngleID").val(ElevationAngle); return; } //-------------- // ShoeProfile function ShowProfile() { var objList = ""; if (gRingList.length == 0) return; try { for (var i =0 ; i<gRingList.length ; i++) objList += "&ObjID"+i+"=" + gRingList[i].ID ; } catch (e) { alert(SGLang.i18n("Text37")) ; return; } // Remove previos popup SGWorld.Window.RemovePopupByCaption(gPopupCaption); var a = new Date(); gPopupCaption = SGLang.i18n("Text19") + Date().toString(); var url = abspath() + "/../TerrainProfile/TerrainProfilePopup.html?Type=3" + objList + "&Density=1&Compare=0&Caption=" + gPopupCaption; var popupMsg = SGWorld.Creator.CreatePopupMessage(gPopupCaption, url, 1, -1000, 100, 100, -1); popupMsg.Flags = 2 + 32; SGWorld.Window.ShowPopup(popupMsg); } //-------------- // CheckNumberEx function CheckNumberEx(field, defVal, MinNum, MaxNum) { try { field.value = validateNumber(field.value); if (field.value < MinNum) field.value = MinNum; if (field.value > MaxNum) field.value = MaxNum; } catch (e) { field.value = defVal } } </script> </body> </html> <!--Sig:00000040mkMXNLI#5a52TFY#E1faqOyI2#t2mlbqFNlnWR51q3LTfVtdo4QjqwI2eWUFDXYNAnXSak1iWIC9XwWBaOUdMdJJ-->
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原文地址：http://www.cnblogs.com/yitianhe/p/4747616.html
