public static int GetAngle()
{
int rotation = 0;
DisplaySettings set = DisplayManager.GetCurrentSettings();
switch (set.Orientation)
{
case Orientation.Default:
rotation = 0;
break;
case Orientation.Clockwise90:
rotation = 90;
break;
case Orientation.Clockwise180:
rotation = 180;
break;
case Orientation.Clockwise270:
rotation = 270;
break;
}
return(rotation);
}
/// <summary>
/// Rotates the screen from its current location by 90 degrees either clockwise or anti-clockwise.
/// </summary>
/// <param name="clockwise">Set to true to rotate the screen 90 degrees clockwise from its current location, or false to rotate it anti-clockwise.</param>
public static int RotateScreen(bool clockwise)
{
int rotation = 0;
DisplaySettings set = DisplayManager.GetCurrentSettings();
int tmp = set.Height;
set.Height = set.Width;
set.Width = tmp;
if (clockwise)
{
set.Orientation++;
}
else
{
set.Orientation--;
}
if (set.Orientation < Orientation.Default)
{
set.Orientation = Orientation.Clockwise270;
}
else if (set.Orientation > Orientation.Clockwise270)
{
set.Orientation = Orientation.Default;
}
SetDisplaySettings(set);
switch (set.Orientation)
{
case Orientation.Default:
rotation = 0;
break;
case Orientation.Clockwise90:
rotation = 90;
break;
case Orientation.Clockwise180:
rotation = 180;
break;
case Orientation.Clockwise270:
rotation = 270;
break;
}
return(rotation);
}
/// <summary>
/// Changes the current display settings with the new settings provided. May throw InvalidOperationException if failed. Check the exception message for more details.
/// </summary>
/// <param name="set">The new settings.</param>
/// <remarks>
/// Internally calls ChangeDisplaySettings() native function.
/// </remarks>
public static void SetDisplaySettings(DisplaySettings set)
{
SafeNativeMethods.DEVMODE mode = GetDeviceMode();
mode.dmPelsWidth = (uint)set.Width;
mode.dmPelsHeight = (uint)set.Height;
mode.dmDisplayOrientation = (uint)set.Orientation;
mode.dmBitsPerPel = (uint)set.BitCount;
mode.dmDisplayFrequency = (uint)set.Frequency;
DisplayChangeResult result = (DisplayChangeResult)SafeNativeMethods.ChangeDisplaySettings(ref mode, 0);
string msg = null;
Assembly asm = Assembly.GetExecutingAssembly();
switch (result)
{
case DisplayChangeResult.BadDualView:
msg = InvalidOperation_Disp_Change_BadDualView;
break;
case DisplayChangeResult.BadParam:
msg = InvalidOperation_Disp_Change_BadParam;
break;
case DisplayChangeResult.BadFlags:
msg = InvalidOperation_Disp_Change_BadFlags;
break;
case DisplayChangeResult.NotUpdated:
msg = InvalidOperation_Disp_Change_NotUpdated;
break;
case DisplayChangeResult.BadMode:
msg = InvalidOperation_Disp_Change_BadMode;
break;
case DisplayChangeResult.Failed:
msg = InvalidOperation_Disp_Change_Failed;
break;
case DisplayChangeResult.Restart:
msg = InvalidOperation_Disp_Change_Restart;
break;
}
if (msg != null)
{
throw new InvalidOperationException(msg);
}
}
public static int ReverseScreen()
{
int rotation = 0;
DisplaySettings set = DisplayManager.GetCurrentSettings();
set.Orientation += 2;
if (set.Orientation == Orientation.Clockwise270 + 2)
{
set.Orientation = Orientation.Clockwise90;
}
else if (set.Orientation == Orientation.Clockwise180 + 2)
{
set.Orientation = Orientation.Default;
}
SetDisplaySettings(set);
switch (set.Orientation)
{
case Orientation.Default:
rotation = 0;
break;
case Orientation.Clockwise90:
rotation = 90;
break;
case Orientation.Clockwise180:
rotation = 180;
break;
case Orientation.Clockwise270:
rotation = 270;
break;
}
return(rotation);
}
