ArcObjects MapControl上での画面座標（pixel）と地図座標の相互変換

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// 地図のEPSGが2451の場合

地図座標をピクセルに変換

ESRI.ArcGIS.Geometry.IPoint pt = new ESRI.ArcGIS.Geometry.Point();
pt.PutCoords(-35708, -53655);
ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = axMapControl1.ActiveView.ScreenDisplay;
int x;
int y;
screenDisplay.DisplayTransformation.FromMapPoint(pt, out x, out y);

ピクセルを地図座標に変換

ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = axMapControl1.ActiveView.ScreenDisplay;
ESRI.ArcGIS.Geometry.IPoint point = screenDisplay.DisplayTransformation.ToMapPoint(100, 100);