/// <summary>
/// Simply grab a 1*1 pixel from the current color image, and
/// use that and copy the new 1*1 image pixels to a byte array and
/// then construct a Color from that.
/// </summary>
private void CanvImage_MouseMove(object sender, MouseEventArgs e)
{
if (!IsMouseDown)
{
return;
}
try
{
CroppedBitmap cb = new CroppedBitmap(ColorImage.Source as BitmapSource,
new Int32Rect((int)Mouse.GetPosition(CanvImage).X,
(int)Mouse.GetPosition(CanvImage).Y, 1, 1));
byte[] pixels = new byte[4];
try
{
cb.CopyPixels(pixels, 4, 0);
}
catch (Exception)
{
//Ooops
}
//Ok now, so update the mouse cursor position and the SelectedColor
ellipsePixel.SetValue(Canvas.LeftProperty, (double)(Mouse.GetPosition(CanvImage).X - 5));
ellipsePixel.SetValue(Canvas.TopProperty, (double)(Mouse.GetPosition(CanvImage).Y - 5));
CanvImage.InvalidateVisual();
SelectedColor = Color.FromArgb((byte)AlphaSlider.Value, pixels[2], pixels[1], pixels[0]);
}
catch (Exception)
{
//not much we can do
}
}
private void CanvasPanel_MouseMove(object sender, MouseEventArgs e)
{
if (!isMouseDown)
{
return;
}
else if (Mouse.GetPosition(CanvasPanel).X < 5 || Mouse.GetPosition(CanvasPanel).X > 165 ||
Mouse.GetPosition(CanvasPanel).Y < 5 || Mouse.GetPosition(CanvasPanel).Y > 165)
{
isMouseDown = false;
}
else if (Mouse.GetPosition(CanvImage).X < CanvImage.Width && Mouse.GetPosition(CanvImage).X >= 0 &&
Mouse.GetPosition(CanvImage).Y < CanvImage.Height && Mouse.GetPosition(CanvImage).Y >= 0)
{
CroppedBitmap cb = new CroppedBitmap(ColorImage.Source as BitmapSource,
new Int32Rect((int)Mouse.GetPosition(CanvImage).X,
(int)Mouse.GetPosition(CanvImage).Y, 1, 1));
byte[] pixels = new byte[4];
cb.CopyPixels(pixels, 4, 0);
MoveEllipse(Mouse.GetPosition(CanvImage).X, Mouse.GetPosition(CanvImage).Y, Color.FromArgb(255, pixels[2], pixels[1], pixels[0]));
CanvImage.InvalidateVisual();
SelectedColor = Color.FromArgb(255, pixels[2], pixels[1], pixels[0]);
UpdateTextBox();
}
}