// 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.
// 

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Timers;

using ESRI.ArcGIS.ADF;
using ESRI.ArcGIS.ADF.Connection.Local;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.SystemUI;

namespace MyDynamicDisplayApp
{
  public sealed class MyDynamicLayer : BaseDynamicLayer
  {
    public bool m_bOnce = true;
    private IDynamicGlyph m_myGlyph = null;
    private IDynamicSymbolProperties2 m_dynamicSymbolProps = null;
    private IPoint m_point = null;
    private double m_stepX = 0;
    private double m_stepY = 0;
    private Timer m_updateTimer = null;

    public MyDynamicLayer() : base()
    {
      base.m_sName = "My Dynamic layer";
      m_updateTimer = new Timer(15);
      m_updateTimer.Enabled = false;
      m_updateTimer.Elapsed += new ElapsedEventHandler(OnTimerElapsed);
    }

    public override void DrawDynamicLayer(esriDynamicDrawPhase DynamicDrawPhase, IDisplay Display, IDynamicDisplay DynamicDisplay)
    {
      if (DynamicDrawPhase != esriDynamicDrawPhase.esriDDPImmediate)
        return;

      if (!m_bValid || !m_visible)
        return;

      IEnvelope visibleExtent = Display.DisplayTransformation.FittedBounds;

      if (m_bOnce)
      {
        IDynamicGlyphFactory dynamicGlyphFactory = DynamicDisplay.DynamicGlyphFactory;
        m_dynamicSymbolProps = DynamicDisplay as IDynamicSymbolProperties2;


        ICharacterMarkerSymbol markerSymbol = new CharacterMarkerSymbolClass();
        markerSymbol.Font = ESRI.ArcGIS.ADF.Connection.Local.Converter.ToStdFont(new Font("ESRI Default Marker", 25.0f, FontStyle.Bold));
        markerSymbol.Size = 25.0;
        // set the symbol color to white
        markerSymbol.Color = (IColor)ESRI.ArcGIS.ADF.Connection.Local.Converter.ToRGBColor(Color.FromArgb(255, 255, 255));
        markerSymbol.CharacterIndex = 92;

        // create the dynamic glyph
        m_myGlyph = dynamicGlyphFactory.CreateDynamicGlyph((ISymbol)markerSymbol);


        Random r = new Random();
        double X = visibleExtent.XMin + r.NextDouble() * visibleExtent.Width;
        double Y = visibleExtent.YMin + r.NextDouble() * visibleExtent.Height;
        m_point = new PointClass();
        m_point.PutCoords(X, Y);

        m_stepX = visibleExtent.Width / 250;
        m_stepY = visibleExtent.Height / 250;

        // start the update timer
        m_updateTimer.Enabled = true;

        m_bOnce = false;
      }

      // draw the marker
      m_dynamicSymbolProps.set_DynamicGlyph(esriDynamicSymbolType.esriDSymbolMarker, m_myGlyph);
      m_dynamicSymbolProps.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 1.0f, 0.0f, 0.0f, 1.0f);
      m_dynamicSymbolProps.SetScale(esriDynamicSymbolType.esriDSymbolMarker, 1.0f, 1.0f);
      DynamicDisplay.DrawMarker(m_point);

      // update the point location for the next draw cycle
      m_point.X += m_stepX;
      m_point.Y += m_stepY;

      // make sure that the point fall within the visible extent
      if (m_point.X > visibleExtent.XMax) m_stepX = -Math.Abs(m_stepX);
      if (m_point.X < visibleExtent.XMin) m_stepX = Math.Abs(m_stepX);
      if (m_point.Y > visibleExtent.YMax) m_stepY = -Math.Abs(m_stepY);
      if (m_point.Y < visibleExtent.YMin) m_stepY = Math.Abs(m_stepY);

      // set the dirty flag to false since drawing is done.
      base.m_bIsImmediateDirty = false;
    }

    void OnTimerElapsed(object sender, ElapsedEventArgs e)
    {
      // set the dirty flag to true in order to assure the next drawing cycle
      base.m_bIsImmediateDirty = true;
    }
  }
}