我在使用RenderTargetBitmap渲染画布并清除其子元素,并将渲染的位图作为画布背景时,遇到了问题,它会向右下方滑动。
在获得10个声望之前无法插入图片 :(。
WPF:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="500" Width="700"
KeyDown="Window_KeyDown">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="*"/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="50"/>
</Grid.ColumnDefinitions>
<Border BorderBrush="Black" BorderThickness="1" Grid.Row="1" Grid.Column="1">
<Canvas x:Name="Pad">
<Rectangle Height="100" Width="100" Fill="Red" Canvas.Left="10" Canvas.Top="10"></Rectangle>
</Canvas>
</Border>
</Grid>
</Window>
C# 代码:
namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_KeyDown(object sender, KeyEventArgs e)
{
RenderTargetBitmap rendrer = new RenderTargetBitmap(Convert.ToInt32(Pad.ActualWidth), Convert.ToInt32(Pad.ActualHeight), 96, 96, PixelFormats.Pbgra32);
rendrer.Render(Pad);
Pad.Background = new ImageBrush(rendrer);
Pad.Children.Clear();
}
}
}