一緒に勉強するArcEngine(3)縮小

カスタムベースクラスToolBaseを継承し、コードは以下の通りで、以前よりずっと爽やかになりました!

   1:      /// <summary>

   2:      ///  

   3:      /// </summary>

   4:      public class ZoomOut : ToolBase

   5:      {

   6:          private INewEnvelopeFeedback m_feedBack;

   7:          private IPoint m_point;

   8:          private Boolean m_isMouseDown;

   9:   

  10:           #region  

  11:          public ZoomOut()

  12:              :base("ZoomOut")  

  13:          {

  14:              if (m_cursor == null) m_cursor = getCursor(esriSystemMouseCursor.esriSystemMouseCursorZoomOut);

  15:          }

  16:        

  17:          public ZoomOut(AxMapControl mapCtl) 

  18:              : base(mapCtl, "ZoomOut") 

  19:          {

  20:              if (m_cursor == null) m_cursor = getCursor(esriSystemMouseCursor.esriSystemMouseCursorZoomOut);

  21:          }

  22:   

  23:          public ZoomOut(AxPageLayoutControl plCtl)

  24:              : base(plCtl, "ZoomOut")

  25:          {

  26:              if (m_cursor == null) m_cursor = getCursor(esriSystemMouseCursor.esriSystemMouseCursorZoomOut);

  27:          }

  28:          #endregion

  29:   

  30:          protected override void initContextMenu()

  31:          {

  32:              ContextMenu cmenu = new ContextMenu();

  33:              MenuItem m = new MenuItem();

  34:              m.Text = " ";

  35:              m.Click += new EventHandler(m_Click);

  36:              cmenu.MenuItems.Add(m);

  37:              m_contextMenu = cmenu;

  38:   

  39:          }

  40:   

  41:          void m_Click(object sender, EventArgs e)

  42:          {

  43:              if (m_pControl is AxMapControl)

  44:              {

  45:                  AxMapControl am = m_pControl as AxMapControl;

  46:                  am.CurrentTool = null;

  47:              }

  48:          }

  49:   

  50:   

  51:          public override void OnMouseDown(int Button, int Shift, int X, int Y)

  52:          {

  53:              if (m_pActiveView == null) return;

  54:              if (Button == 2)

  55:              {

  56:                  ShowContextMenu(X, Y);

  57:                  return;

  58:              }

  59:   

  60:              m_point = m_pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);

  61:              m_cursor = getCursor(ESRI.ArcGIS.SystemUI.esriSystemMouseCursor.esriSystemMouseCursorZoomOut);

  62:              m_isMouseDown = true;

  63:   

  64:          }

  65:   

  66:          public override void OnMouseMove(int Button, int Shift, int X, int Y)

  67:          {

  68:              if (!m_isMouseDown) return;

  69:   

  70:              //Start an envelope feedback

  71:              if (m_feedBack == null)

  72:              {

  73:                  m_feedBack = new NewEnvelopeFeedbackClass();

  74:                  m_feedBack.Display = m_pActiveView.ScreenDisplay;

  75:                  m_feedBack.Start(m_point);

  76:              }

  77:              //Move the envelope feedback

  78:              m_feedBack.MoveTo(m_pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y));

  79:          }

  80:   

  81:          public override void OnMouseUp(int Button, int Shift, int X, int Y)

  82:          {

  83:              if (!m_isMouseDown) return;

  84:   

  85:              IEnvelope pEnvelope;

  86:              IEnvelope pFeedEnvelope;

  87:   

  88:              double newWidth, newHeight;

  89:   

  90:              //If an envelope has not been tracked

  91:              if (m_feedBack == null)

  92:              {

  93:                  //Zoom out from the mouse click

  94:                  pEnvelope = m_pActiveView.Extent;

  95:                  pEnvelope.Expand(2, 2, true);

  96:                  pEnvelope.CenterAt(m_point);

  97:              }

  98:              else

  99:              {

 100:                  //Stop the envelope feedback

 101:                  pFeedEnvelope = m_feedBack.Stop();

 102:   

 103:                  //Exit if the envelope height or width is 0

 104:                  if (pFeedEnvelope.Width == 0 || pFeedEnvelope.Height == 0)

 105:                  {

 106:                      m_feedBack = null;

 107:                      m_isMouseDown = false;

 108:                  }

 109:   

 110:                  newWidth = m_pActiveView.Extent.Width * (m_pActiveView.Extent.Width / pFeedEnvelope.Width);

 111:                  newHeight = m_pActiveView.Extent.Height * (m_pActiveView.Extent.Height / pFeedEnvelope.Height);

 112:   

 113:                  //Set the new extent coordinates

 114:                  pEnvelope = new EnvelopeClass();

 115:                  pEnvelope.PutCoords(m_pActiveView.Extent.XMin - ((pFeedEnvelope.XMin - m_pActiveView.Extent.XMin) * (m_pActiveView.Extent.Width / pFeedEnvelope.Width)),

 116:                      m_pActiveView.Extent.YMin - ((pFeedEnvelope.YMin - m_pActiveView.Extent.YMin) * (m_pActiveView.Extent.Height / pFeedEnvelope.Height)),

 117:                      (m_pActiveView.Extent.XMin - ((pFeedEnvelope.XMin - m_pActiveView.Extent.XMin) * (m_pActiveView.Extent.Width / pFeedEnvelope.Width))) + newWidth,

 118:                      (m_pActiveView.Extent.YMin - ((pFeedEnvelope.YMin - m_pActiveView.Extent.YMin) * (m_pActiveView.Extent.Height / pFeedEnvelope.Height))) + newHeight);

 119:              }

 120:   

 121:              //Set the new extent

 122:              m_pActiveView.Extent = pEnvelope;

 123:   

 124:              //Refresh the active view

 125:              m_pActiveView.Refresh();

 126:              m_feedBack = null;

 127:              m_isMouseDown = false;

 128:          }

 129:   

 130:          public void OnKeyDown(int keyCode, int shift)

 131:          {

 132:              if (m_isMouseDown)

 133:              {

 134:                  if (keyCode == 27) //ESC key

 135:                  {

 136:                      m_feedBack = null;

 137:                      m_isMouseDown = false;

 138:                      m_pHookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);

 139:                  }

 140:              }

 141:          }

 142:      }

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