private void GetColor()
{
while (true)
{
x = Cursor.Position.X;
y = Cursor.Position.Y;
// BEGIN COORDINATE CORRECTION CODE
// still haven't taken the time to figure this out.
// it calculates the position different on different computers (different screens)
// the problem is the value that gets sent to Win32.GetPixelColor. it wants them in "logical units" https://docs.microsoft.com/en-us/windows/desktop/api/wingdi/nf-wingdi-getpixel
// apparently you can get that with dptolp but the code is gibirish to me (and i think wrong) https://www.pinvoke.net/default.aspx/gdi32/DPtoLP.html
// the magic google was "c# convert to logical units" https://stackoverflow.com/questions/30424985/how-to-convert-a-wpf-inch-unit-to-winforms-pixels-and-vice-versa
// additional reading https://stackoverflow.com/questions/422296/how-do-i-determine-the-true-pixel-size-of-my-monitor-in-net
// why the * 2? well that is a GREAT question.
try
{
this.Invoke(new Action(() =>
{
PointF dpi = PointF.Empty;
using (Graphics g = this.CreateGraphics())
{
dpi.X = g.DpiX;
dpi.Y = g.DpiY;
x = Convert.ToInt32(x * 72 / dpi.X) * 2;
y = Convert.ToInt32(y * 72 / dpi.Y) * 2;
}
}));
}
catch { }
// END COORDINATE CORRECTION CODE
color = Win32.GetPixelColor(x, y);
panColor.BackColor = color;
panNamedColor.BackColor = namedColorRGB;
namedColor = ColorSpaceConverter.RGBToNamedColor(color.R, color.G, color.B, true);
panNamedColor.BackColor = System.Drawing.Color.FromArgb(color.R, color.G, color.B);
try
{
this.Invoke(updateFormDelegate);
}
catch { }
Thread.Sleep(50);
}
}
