// Setup rectangle for the hotspot mark's location.
ImGearRectangle igRectangle = new ImGearRectangle(10, 10, 300, 100);
// Setup color for the hotspot.
ImGearRGBQuad igRGBQuad = new ImGearRGBQuad(40, 200, 40);
// Create hotspot with an opacity of 75%.
ImGearARTHotSpot igARTHotSpot = new ImGearARTHotSpot(
    igRectangle, igRGBQuad, (int)(0.75 * 255)
);
// Add the annotation to the ARTPage.
igARTPage.AddMark(igARTHotSpot, ImGearARTCoordinatesType.IMAGE_COORD);

' Setup rectangle for the hotspot mark's location.
Dim igRectangle As New ImGearRectangle(10, 10, 300, 100)
' Setup color for the hotspot.
Dim igRGBQuad As New ImGearRGBQuad(40, 200, 40)
' Create hotspot with an opacity of 75%.
Dim igARTHotSpot As New ImGearARTHotSpot( _
 igRectangle, igRGBQuad, CInt(0.75 * 255))
' Add the annotation to the ARTPage.
igARTPage.AddMark(igARTHotSpot, ImGearARTCoordinatesType.IMAGE_COORD)