'获取CAD屏幕像素的比值
Function ViewScreen() As Double
Dim ScreenSize As Variant
ScreenSize = ThisDrawing.GetVariable("screensize") '当前视口的屏幕宽度和高度
Dim H As Variant
H = ThisDrawing.GetVariable("viewsize") '当前视图图形的实际高度
ViewScreen = Abs(H / ScreenSize(1))
End Function
Public Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
获取屏幕中某个点的RGB值
public static Color GetColor()
{
POINT _Point = new POINT();
GetCursorPos(ref _Point);
IntPtr _Hwnd = WindowFromPoint((uint)_Point.x, (uint)_Point.y);
IntPtr _DC = GetDC(_Hwnd);
ScreenToClient(_Hwnd, ref _Point);
uint _ColorLong = GetPixel(_DC, _Point.x, _Point.y);
Color _Color = Color.FromArgb((int)_ColorLong & 0xFF, (int)(_ColorLong & 0xFF00) / 256, (int)(_ColorLong & 0xFF0000) / 65536);
ReleaseDC(_Hwnd, _DC);
return _Color;
}
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int x;
public int y;
}
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern uint GetPixel(IntPtr hDC, int XPos, int YPos);
[DllImport("user32.dll")]
public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p_Point);
[DllImport("user32.dll")]
public static extern bool GetCursorPos(ref POINT p_Point);
[DllImport("user32.dll")]
public static extern IntPtr WindowFromPoint(uint x_point, uint y_point);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetDC(IntPtr hWnd);
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