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This article will explain in detail how to use API for Polygon dynamic plotting in the secondary development of TE. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

In the secondary development of TE, API is used for dynamic plotting of Polygon. In the CS program, when Polyon intersects itself, the program will throw an exception, but in the development of bs web pages, this error will not occur. However, CS development dynamic painting Polygon also has a solution to ensure that there are no exceptions in the process of painting. Share the detailed implementation code below.

Define the left mouse button, right button, real-time events in the secondary development of te to add their own, the code is mainly the detailed implementation of each event, the detailed CS code is as follows.

/ / left mouse button event

Protected bool sgworld_OnLButtonUp (int Flags, int X, int Y)

{

Try

{

Var ptw = sgworld.Window.PixelToWorld (X, Y, WorldPointType.WPT_TERRAIN)

/ / in order to achieve real-time dynamic effect, draw a line first, because the face needs at least 3 points

If (tPolyline = = null)

{

Double [] pointarray = {ptw.Position.X, ptw.Position.Y, ptw.Position.Altitude, ptw.Position.X, ptw.Position.Y, ptw.Position.Altitude + 0.1}

ILineString cPolygonGeometry = sgworld.Creator.GeometryCreator.CreateLineStringGeometry (pointarray)

TPolyline = sgworld.Creator.CreatePolyline (cPolygonGeometry, sgworld.Creator.CreateColor (lineColor.R, lineColor.G, lineColor.B, lineColor.A), AltitudeTypeCode.ATC_TERRAIN_RELATIVE, string.Empty, "tempPolyline")

/ / start editing lines

TPolyline.Geometry.StartEdit ()

}

Else

{

If (tPolygon = = null)

{

/ / get the coordinates of the line and prepare to draw polygon

Var _ temGeo = tPolyline.Geometry as ILineString

Dynamic _ temPoint = _ temGeo.Points [0]

Double [] arrr = new double [] {_ temPoint.X, _ temPoint.Y, _ temPoint.Z, ptw.Position.X, ptw.Position.Y, ptw.Position.Altitude, ptw.Position.X, ptw.Position.Y, ptw.Position.Altitude + 0.1}

Var myGeometry = sgworld.Creator.GeometryCreator.CreateLinearRingGeometry (arrr)

TPolyline.Geometry.EndEdit ()

Sgworld.Creator.DeleteObject (tPolyline.ID)

/ / draw polygon

TPolygon = sgworld.Creator.CreatePolygon (myGeometry, sgworld.Creator.CreateColor (lineColor.R, lineColor.G, lineColor.B, lineColor.A), sgworld.Creator.CreateColor (fillColor.R, fillColor.G, fillColor.B, fillColor.A), AltitudeTypeCode.ATC_ON_TERRAIN, groupid, "Polygon")

/ / set the polygon property and edit the polygon

TPolygon.FillStyle.Color.SetAlpha (fOpacity)

TPolygon.Geometry.StartEdit ()

}

Else

{

/ / Edit the coordinates of polyon

Polygon = tPolygon.Geometry as IPolygon

If (polygon! = null)

{

IRings1 = polygon.ExteriorRing as ILinearRing

IPoint Ipint = IRings1.Points [IRings1.Points.Count-1] as IPoint

Ipint.X = ptw.Position.X

Ipint.Y = ptw.Position.Y

Ipint.Z = ptw.Position.Altitude

IRings1.Points.AddPoint (ptw.Position.X, ptw.Position.Y, ptw.Position.Altitude)

}

}

}

}

Catch (Exception ex1)

{

Throw new Exception (ex1.Message)

}

Return false

}

/ / Real-time rendering of events

Protected void sgworld_OnFrame ()

{

Try

{

/ / obtain the mouse information and convert the spatial coordinate information

Var mouseinfo = sgworld.Window.GetMouseInfo ()

Var ptwtwo = sgworld.Window.PixelToWorld (mouseinfo.X, mouseinfo.Y)

If (tPolygon! = null)

{

Polygon = tPolygon.Geometry as IPolygon;// cast

If (polygon! = null)

{

/ / Editing coordinate information in polygon

IRings1 = polygon.ExteriorRing as ILinearRing

Var Ipint = IRings1.Points [IRings1.Points.Count-1] as IPoint

Ipint.X = ptwtwo.Position.X

Ipint.Y = ptwtwo.Position.Y

Ipint.Z = ptwtwo.Position.Altitude

}

}

Else if (tPolyline! = null)

{

/ / Editing coordinate information in Polyline

Var tLineStr = tPolyline.Geometry as ILineString

Var Ipint = tLineStr.Points [tLineStr.Points.Count-1] as IPoint as IPoint

Ipint.X = ptwtwo.Position.X

Ipint.Y = ptwtwo.Position.Y

Ipint.Z = ptwtwo.Position.Altitude

}

}

Catch (Exception ex2)

{

Throw new Exception (ex2.Message)

}

}

/ / right to end the event

Protected bool sgworld_OnRButtonUp (int Flags, int X, int Y)

{

If (tPolygon! = null)

{

TPolyline = null

Polygon = tPolygon.Geometry as IPolygon

If (polygon! = null)

{

IRings1 = polygon.ExteriorRing as ILinearRing

/ / end editing. If there are not enough coordinate points, delete the object.

If (IRings1.Points.Count > 3)

{

IRings1.Points.DeletePoint (IRings1.Points.Count-1)

TPolygon.Geometry.EndEdit ()

Polygon = null

}

Else

{

Sgworld.Creator.DeleteObject (tPolygon.ID)

TPolygon = null

}

}

}

Return false

}

This is the end of the article on "how to use API for dynamic plotting of Polygon in te secondary development". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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