/// <summary>
/// Constructor that initializes to ColorPicker to the specified color.
/// </summary>
/// <param name="initialColor"></param>
public ColorPicker(Color initialColor)
{
this.InitializeComponent();
this.SelectedColor = initialColor;
this.SelectedBrightness = 255;
}
/// <summary>
/// Sets a new Selected Color based on the color of the pixel under the mouse pointer.
/// </summary>
private void UpdateColor()
{
// Test to ensure we do not get bad mouse positions along the edges
int imageX = (int)Mouse.GetPosition(this.canvasImage).X;
int imageY = (int)Mouse.GetPosition(this.canvasImage).Y;
if ((imageX < 0) || (imageY < 0) || (imageX > this.ColorImage.Width - 1) || (imageY > this.ColorImage.Height - 1)) return;
// Get the single pixel under the mouse into a bitmap and copy it to a byte array
CroppedBitmap cb = new CroppedBitmap(this.ColorImage.Source as BitmapSource, new Int32Rect(imageX, imageY, 1, 1));
byte[] pixels = new byte[4];
cb.CopyPixels(pixels, 4, 0);
// Update the mouse cursor position and the Selected Color
this.ellipsePixel.SetValue(Canvas.LeftProperty, (double)(Mouse.GetPosition(this.canvasImage).X - (this.ellipsePixel.Width / 2.0)));
this.ellipsePixel.SetValue(Canvas.TopProperty, (double)(Mouse.GetPosition(this.canvasImage).Y - (this.ellipsePixel.Width / 2.0)));
this.canvasImage.InvalidateVisual();
// Set the Selected Color based on the cursor pixel and Alpha Slider value
this.SelectedColor = new Color(pixels[2], pixels[1], pixels[0]);
this.SelectedBrightness = (byte)this.AlphaSlider.Value;
}
/// <summary>
/// Update the mouse cursor ellipse position.
/// </summary>
private void UpdateCursorEllipse(Color searchColor)
{
// Scan the canvas image for a color which matches the search color
CroppedBitmap cb;
Color tempColor = new Color();
byte[] pixels = new byte[4];
int searchY = 0;
int searchX = 0;
for (searchY = 0; searchY <= this.canvasImage.Width - 1; searchY++)
{
for (searchX = 0; searchX <= this.canvasImage.Height - 1; searchX++)
{
cb = new CroppedBitmap(this.ColorImage.Source as BitmapSource, new Int32Rect(searchX, searchY, 1, 1));
cb.CopyPixels(pixels, 4, 0);
tempColor = new Color(pixels[2], pixels[1], pixels[0]);
if (tempColor == searchColor) break;
}
if (tempColor == searchColor) break;
}
// Default to the top left if no match is found
if (tempColor != searchColor)
{
searchX = 0;
searchY = 0;
}
// Update the mouse cursor ellipse position
this.ellipsePixel.SetValue(Canvas.LeftProperty, ((double)searchX - (this.ellipsePixel.Width / 2.0)));
this.ellipsePixel.SetValue(Canvas.TopProperty, ((double)searchY - (this.ellipsePixel.Width / 2.0)));
}
/// <summary>
/// Update SelectedColor Alpha based on Slider value.
/// </summary>
private void AlphaSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
this.SelectedBrightness = (byte)this.AlphaSlider.Value;
this.SelectedColor = new Color(this.SelectedColor.Red, this.SelectedColor.Green, this.SelectedColor.Blue);
}
