Silverlight开发历程—(利用C#代码制作取色器)

第一个例子是，利用C#代码绘制画刷，例子很简单直接上代码：

<StackPanel x:Name="LayoutRoot" Background="White" Orientation="Vertical">        <Ellipse x:Name="ellipse" Width="260" Height="260" Fill="GreenYellow"/>        <TextBlock x:Name="txb_txb" FontSize="30" Text="使用C#绘制Brush" />    </StackPanel>

C#:

    public partial class DrawBruseWithCSharp : UserControl    {        public DrawBruseWithCSharp()        {            InitializeComponent();            //绘制单色填充，            ellipse.Stroke = new SolidColorBrush(Colors.Black);            ellipse.StrokeThickness = 3;            //绘制渐变填充            LinearGradientBrush lgb = new LinearGradientBrush();            lgb.GradientStops.Add(new GradientStop() {  Color=Colors.Green, Offset=0});            lgb.GradientStops.Add(new GradientStop() {  Color=Colors.Yellow,Offset=1});            txb_txb.Foreground = lgb;            ellipse.Fill = lgb;        }    }

运行结果：

第二个例子。利用C#代码绘制取色器

XAML：

 <Grid x:Name="LayoutRoot" Background="White">        <!-- 添加圆角边框-->        <Border BorderBrush="Black" Margin="5" BorderThickness="3"  Background="AliceBlue" CornerRadius="10">            <!--添加网络边矩-->            <Grid Margin="5" ShowGridLines="False">                <Grid.RowDefinitions>                    <RowDefinition  />                    <RowDefinition  />                    <RowDefinition  />                    <RowDefinition  />                </Grid.RowDefinitions>                <Grid.ColumnDefinitions>                    <ColumnDefinition />                    <ColumnDefinition />                </Grid.ColumnDefinitions>                <!--添加颜色滚动条-->                <Slider x:Name="sliderR" Maximum="255" Value="255" Grid.Row="0" Grid.Column="1" />                <Slider x:Name="sliderG" Maximum="255" Value="255" Grid.Row="1" Grid.Column="1" />                <Slider x:Name="sliderB" Maximum="255" Value="255" Grid.Row="2" Grid.Column="1" />                <Slider x:Name="sliderA" Maximum="255" Value="255" Grid.Row="3" Grid.Column="1" />                <!--添加说明文字-->                <TextBlock x:Name="txb_R" Text="R:" Width="50" Height="20" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" />                <TextBlock x:Name="txb_G" Text="G:" Width="50" Height="20" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" />                <TextBlock x:Name="txb_B" Text="B:" Width="50" Height="20" Grid.Row="2" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" />                <TextBlock x:Name="txb_A" Text="透明度:" Width="50" Height="20" Grid.Row="3" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" />                <!--显示颜色-->                <Rectangle x:Name="rect" Fill="Green" Stroke="Black" Width="150" Height="120" Grid.Row="1" Grid.RowSpan="2" Grid.Column="0" />                <!--显示颜色值-->                <TextBlock x:Name="txb_Color" Width="140" Height="26" Grid.Row="3" Grid.Column="0" />                <!--标题说明文字-->                <TextBlock Text="色值"  Grid.Row="3" Grid.Column="0" />                <TextBlock Text="Silverlight取色器"  FontSize="20" Width="200" HorizontalAlignment="Left" VerticalAlignment="Top" Grid.Row="0" Grid.Column="0" Height="30" />            </Grid>        </Border>    </Grid>

C#：

public partial class DrawGetColorControl : UserControl    {        public DrawGetColorControl()        {            InitializeComponent();            //设置颜色            setColor();            sliderA.ValueChanged += new RoutedPropertyChangedEventHandler<double>(SliderValueChanged);            sliderB.ValueChanged += new RoutedPropertyChangedEventHandler<double>(SliderValueChanged);            sliderR.ValueChanged += new RoutedPropertyChangedEventHandler<double>(SliderValueChanged);            sliderG.ValueChanged += new RoutedPropertyChangedEventHandler<double>(SliderValueChanged);        }        void SliderValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)        {            setColor();        }        private void setColor()        {            SolidColorBrush scb = new SolidColorBrush(                Color.FromArgb(                (byte)sliderA.Value,                (byte)sliderR.Value,                 (byte)sliderG.Value,                 (byte)sliderB.Value));            rect.Fill = scb;            txb_Color.Text = scb.Color.ToString();        }    }

运行结果：