' Copyright 2010 ESRI
' 
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' 
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' 
' See the use restrictions.
' 

Imports Microsoft.VisualBasic
Imports System
Namespace ESRI.ADF.Samples.Renderers
  ''' <summary>
  ''' Renders point graphic features with the image specified by the features' attribute data
  ''' </summary>
  <System.Serializable> _
  Public Class SimplePointRenderer
    Inherits ESRI.ADF.Samples.Renderers.RendererBase
    Private imagePathColumn_Renamed As String = "ImagePath"

    ''' <summary>
    ''' Name of the column containing the path to the image that will be used to symbolize the feature
    ''' </summary>
    Public Property ImagePathColumn() As String
      Get
        Return imagePathColumn_Renamed
      End Get
      Set
        imagePathColumn_Renamed = Value
      End Set
    End Property

    #Region "IRenderer Members"

    ''' <summary>
    ''' Main part of the IRenderer interface, within which a feature encapsulating the specified DataRow is to be 
    ''' rendered on the specified graphics surface. The geometry instance has already been transformed to screen 
    ''' coordinate, so we don't have to worry about that here.
    ''' </summary>
    ''' <param name="row">row containing the feature's data</param>
    ''' <param name="graphics">GDI+ surface on which to render the feature</param>
    ''' <param name="geometryColumn">column containing the feature's geometry</param>
    Public Overrides Sub Render(ByVal row As System.Data.DataRow, ByVal graphics As System.Drawing.Graphics, ByVal geometryColumn As System.Data.DataColumn)
      ' Validate method input
      If row Is Nothing OrElse graphics Is Nothing OrElse geometryColumn Is Nothing Then
        Return
      End If

      ' Validate input geometry.  This renderer only supports points.
      Dim geometry As ESRI.ArcGIS.ADF.Web.Geometry.Geometry = TryCast(row(geometryColumn), ESRI.ArcGIS.ADF.Web.Geometry.Geometry)
      If geometry Is Nothing OrElse Not(TypeOf geometry Is ESRI.ArcGIS.ADF.Web.Geometry.Point) Then
        Return
      End If

      ' Get the input point
      Dim p As ESRI.ArcGIS.ADF.Web.Geometry.Point = TryCast(geometry, ESRI.ArcGIS.ADF.Web.Geometry.Point)

      ' Make sure the feature contains the image path column specified on the renderer
      If row.Table.Columns.Contains(Me.ImagePathColumn) Then
        ' Get the path to the image
        Dim imagePath As String = row(Me.ImagePathColumn).ToString()

        ' Convert the relative path to its absolute equivalent
        imagePath = System.Web.HttpContext.Current.Server.MapPath(imagePath)

        ' Make sure the image exists
        If (Not System.IO.File.Exists(imagePath)) Then
          System.Diagnostics.Debug.Fail("Image path '" & imagePath & "' not found")
          Return
        End If

        ' Get the image and draw it at the location specified by the input point
        Using image As System.Drawing.Image = System.Drawing.Image.FromFile(imagePath)
          graphics.DrawImageUnscaled(image, System.Convert.ToInt32(p.X), System.Convert.ToInt32(p.Y))
        End Using
      End If
    End Sub

    ''' <summary>
    ''' Creates swatches used for the Table of Contents / Legend.
    ''' This is automatically called by IMapTocFunctionality when generating the TOC.
    ''' </summary>
    ''' <param name="swatchInfo"></param>
    ''' <param name="fileName"></param>
    ''' <param name="minScale"></param>
    ''' <param name="maxScale"></param>
    ''' <returns></returns>
    Public Overrides Function GenerateSwatches(ByVal swatchInfo As ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchInfo, ByVal fileName As String, ByVal minScale As String, ByVal maxScale As String) As ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchCollection
      Dim swatches As ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchCollection = New ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchCollection()
      Dim swatchUtility As ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchUtility = New ESRI.ArcGIS.ADF.Web.Display.Swatch.SwatchUtility(swatchInfo)

      ' Create the swatches and add them to the swatch collection.  The code assumes three images placed in a
      ' website folder named "images" and named 1.gif, 2.gif, and 3.gif.
      For i As Integer = 1 To 3
        ' Get the absolute path to the current image
        Dim swatchPath As String = String.Format("~/images/{0}.gif", i)
        swatchPath = System.Web.HttpContext.Current.Server.MapPath(swatchPath)

        ' Create a symbol from the image
        Dim swatchSymbol As ESRI.ArcGIS.ADF.Web.Display.Symbol.RasterMarkerSymbol = New ESRI.ArcGIS.ADF.Web.Display.Symbol.RasterMarkerSymbol(swatchPath)

        ' Generate the swatch image and add it to the collection
        Dim swatchImage As ESRI.ArcGIS.ADF.Web.CartoImage = swatchUtility.DrawNewSwatch(swatchSymbol, Nothing)
        swatches.Add(New ESRI.ArcGIS.ADF.Web.Display.Swatch.Swatch(swatchImage, "Marker #" & i.ToString(), Nothing, Nothing))
      Next i
      Return swatches
    End Function

    #End Region
  End Class
End Namespace