using system colors to create gradients : Color « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. Color

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="SystemColorsAndBrushes_csharp.Window1"
    Title="System Colors" >
   <Window.Resources>
    <Style TargetType="{x:Type Rectangle}">
      <Setter Property="Margin" Value="10,0,10,0"/>
      <Setter Property="HorizontalAlignment" Value="Left"/>
      <Setter Property="Height" Value="20"/>
      <Setter Property="Width" Value="120"/>
      <Setter Property="Stroke" Value="Black"/>
      <Setter Property="StrokeThickness" Value="1"/>
    </Style>
    <Style TargetType="{x:Type TextBlock}">
      <Setter Property="Margin" Value="10,20,10,0"/>
    </Style>
    <Style TargetType="{x:Type Button}">
      <Setter Property="Margin" Value="10,0,10,0"/>
      <Setter Property="HorizontalAlignment" Value="Left"/>
    </Style>
    </Window.Resources>
    <ScrollViewer>

    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition Width="5" />
        <ColumnDefinition />
      </Grid.ColumnDefinitions>
      <Grid.RowDefinitions>
        <RowDefinition />
      </Grid.RowDefinitions>
      <Rectangle Grid.Column="1" Grid.Row="0" 
        HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Fill="Black"
        RadiusX="10" RadiusY="10" />
    
      <StackPanel Name="systemBrushesPanel" Background="White" Grid.Row="0" Grid.Column="0"/> 
      <StackPanel Name="gradientExamplePanel" Background="White" Grid.Row="0" Grid.Column="2"/>

  </Grid>
  
  </ScrollViewer>
</Window>


//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Data;

namespace SystemColorsAndBrushes_csharp
{
    public partial class Window1 : Window
    {
        public Window1() {
            InitializeComponent();
            System.Windows.Controls.TextBlock t = new System.Windows.Controls.TextBlock();
            t.Text = "System Color Gradient Examples";
            t.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
            t.FontWeight = System.Windows.FontWeights.Bold;
            gradientExamplePanel.Children.Add(t);

            t = new System.Windows.Controls.TextBlock();
            t.Text = "ControlDark to ControlLight";
            System.Windows.Shapes.Rectangle r = new System.Windows.Shapes.Rectangle();
            r.Fill = new System.Windows.Media.RadialGradientBrush(
                System.Windows.SystemColors.ControlDarkColor, System.Windows.SystemColors.ControlLightColor);
            gradientExamplePanel.Children.Add(t);
            gradientExamplePanel.Children.Add(r);

            t = new System.Windows.Controls.TextBlock();
            t.Text = "ControlDarkDark to ControlLightLight";
            r = new System.Windows.Shapes.Rectangle();
            r.Fill = new System.Windows.Media.LinearGradientBrush(System.Windows.SystemColors.ControlDarkDarkColor, System.Windows.SystemColors.ControlLightLightColor, 45);
            gradientExamplePanel.Children.Add(t);
            gradientExamplePanel.Children.Add(r);
            
            // Try it out on a button.
            t = new System.Windows.Controls.TextBlock();
            t.Text = "Desktop to AppWorkspace";
            System.Windows.Controls.Button b = new System.Windows.Controls.Button();
            b.Width = 120;
            b.Height = 20;
            b.Background = new System.Windows.Media.RadialGradientBrush(System.Windows.SystemColors.DesktopColor, System.Windows.SystemColors.AppWorkspaceColor);
            gradientExamplePanel.Children.Add(t);
            gradientExamplePanel.Children.Add(b);

            t = new System.Windows.Controls.TextBlock();
            t.Text = "Desktop to Control";
            b = new System.Windows.Controls.Button();
            b.Width = 120;
            b.Height = 20;
            b.Background = new System.Windows.Media.RadialGradientBrush(System.Windows.SystemColors.DesktopColor, System.Windows.SystemColors.ControlColor);
            gradientExamplePanel.Children.Add(t);
            gradientExamplePanel.Children.Add(b);

        }

    }
}

24.82.Color
	24.82.1.	Color Animation
	24.82.2.	Highlights the gradient origin and the gradient circle
	24.82.3.	using Color structures
	24.82.4.	Use System Color to draw Line
	24.82.5.	This text uses a gradient
	24.82.6.	Diagonal Linear Gradient
	24.82.7.	A Partially Transparent Button
	24.82.8.	A Radial Gradient
	24.82.9.	A Radial Gradient with an Offset Center
	24.82.10.	GradientStop with Transparent color
	24.82.11.	Simulating lighting effects with linear fills
	24.82.12.	Color Converter With String Format
	24.82.13.	Colors and Brushes
	24.82.14.	From a Hex string using ColorConverter
	24.82.15.	From ScRGB values in the Color structure
	24.82.16.	From sRGB values in the Color strutcure
	24.82.17.	From predefined color name in the Colors class
	24.82.18.	Fills the polylines with a light gray color
	24.82.19.	Using SystemColors in Code
	24.82.20.	using system colors to create gradients
	24.82.21.	Using Colors.Red, Colors.Indigo and Colors.Violet to create rainbow