/// <summary>
/// 画面を回転
/// </summary>
/// <param name="increment">回転量</param>
/// <returns></returns>
public int Rotate(int increment)
{
var deviceMode = this.Mode.Mode;
//奇数量回転の場合は高さと幅を入れ替える
if (increment % 2 == 1)
{
// swap width and height
int temp = deviceMode.dmPelsHeight;
deviceMode.dmPelsHeight = deviceMode.dmPelsWidth;
deviceMode.dmPelsWidth = temp;
}
var newOrientation = (deviceMode.dmDisplayOrientation + increment) % 4;
deviceMode.dmDisplayOrientation = newOrientation;
var result = DisplayDevice.ChangeDisplaySettingsEx
(this.Mode.Name, ref deviceMode, IntPtr.Zero, DisplayDevice.CDS_UPDATEREGISTRY, IntPtr.Zero);
//DISP_CHANGE_SUCCESSFUL = 0: Indicates that the function succeeded.
//DISP_CHANGE_BADMODE = -2: The graphics mode is not supported.
//DISP_CHANGE_FAILED = -1: The display driver failed the specified graphics mode.
//DISP_CHANGE_RESTART = 1: The computer must be restarted for the graphics mode to work.
/*
* if (NativeMethods.DISP_CHANGE_SUCCESSFUL != iRet)
* {
* // add exception handling here
* }*/
if (increment != 0)
{
DisplayDevice.ChangeDisplaySettingsEx
(this.Mode.Name, ref deviceMode, IntPtr.Zero, 0, IntPtr.Zero);
}
return(result);
}
