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/***************** NCore Softwares Pvt. Ltd., India **************************
ColorBox
Copyright (C) 2013 NCore Softwares Pvt. Ltd.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://colorbox.codeplex.com/license
***********************************************************************************/
using System;
using System.Windows.Media;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Collections.ObjectModel;
using System.Windows.Media.Imaging;
namespace Tango.BrushPicker
{
class GradientStopAdder : Button
{
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseLeftButtonDown(e);
if (e.Source is GradientStopAdder && this.ColorBox != null)
{
Button btn = e.Source as Button;
GradientStop _gs = new GradientStop();
_gs.Offset = Mouse.GetPosition(btn).X / btn.ActualWidth;
//_gs.Color = this.ColorBox.Color;
_gs.Color = GetColorFromImage(e.GetPosition(this));
this.ColorBox.Gradients.Insert(this.ColorBox.Gradients.Count - 1, _gs);
this.ColorBox.SelectedGradient = _gs;
this.ColorBox.Color = _gs.Color;
this.ColorBox.SetBrush();
}
}
Color GetColorFromImage(Point p)
{
try
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(this);
RenderTargetBitmap rtb = new RenderTargetBitmap((Int32)bounds.Width, (Int32)bounds.Height, 96, 96, PixelFormats.Default);
rtb.Render(this);
byte[] arr;
PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(rtb));
using (var stream = new System.IO.MemoryStream())
{
png.Save(stream);
arr = stream.ToArray();
}
BitmapSource bitmap = BitmapFrame.Create(new System.IO.MemoryStream(arr));
byte[] pixels = new byte[4];
CroppedBitmap cb = new CroppedBitmap(bitmap, new Int32Rect((int)p.X, (int)p.Y, 1, 1));
cb.CopyPixels(pixels, 4, 0);
return Color.FromArgb(pixels[3], pixels[2], pixels[1], pixels[0]);
}
catch (Exception)
{
return this.ColorBox.Color;
}
}
public BrushPicker ColorBox
{
get { return (BrushPicker)GetValue(ColorBoxProperty); }
set { SetValue(ColorBoxProperty, value); }
}
public static readonly DependencyProperty ColorBoxProperty =
DependencyProperty.Register("ColorBox", typeof(BrushPicker), typeof(GradientStopAdder));
}
}
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