我渲染一個WPF視覺(用戶控件)的位圖,但問題是,所呈現的圖像之前縮放/轉換的用戶控件的大小縮放大小。所以我們假設UserControl設計爲200x200像素。當我渲染到BMP時,我使用的是分別報告200和200的UserControl的ActualWidth和ActualHeightt。問題是UserControl是在畫布中並且自動調整大小(設置爲縮放/填充窗口大小)到更接近1200 x 1200(更改)如何獲取一個WPF視覺元素
我已經完成了一些閱讀和搜索,不知道如何確定有效尺寸,即控制器在屏幕上的尺寸。
我遇到了這個問題聽起來充滿希望,但變換返回不包含縮放數據。好吧,但它們都是1. Get element position after transform
任何關於在哪裏尋找渲染縮放的建議都會很棒!
[更新]作爲建議,我包括相關代碼:
public static Bitmap PngBitmap(this Visual visual)
{
// Get height and width
int width = (int)(double)visual.GetValue(
FrameworkElement.ActualWidthProperty);
int height = (int)(double)visual.GetValue(
FrameworkElement.ActualHeightProperty);
// Render
RenderTargetBitmap rtb =
new RenderTargetBitmap(
width,
height,
96,
96,
PixelFormats.Default);
rtb.Render(visual);
// Encode
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(rtb));
System.IO.MemoryStream stream = new System.IO.MemoryStream();
encoder.Save(stream);
// Create Bitmap
Bitmap bmp = new Bitmap(stream);
stream.Close();
return bmp;
}
public static BitmapSource BitmapSource(this Visual visual)
{
Bitmap bmp = visual.PngBitmap();
IntPtr hBitmap = bmp.GetHbitmap();
BitmapSizeOptions sizeOptions = BitmapSizeOptions.FromEmptyOptions();
return Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
Int32Rect.Empty,
sizeOptions);
}
[更新#2]添加了XAML - Grid元素被刪除,因爲它是巨大的,從我的讀取包含鍵盤UserControl的Canvas並不是Grid元素的一部分。
<UserControl 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:PMD.HECAT.DashboardModule"
xmlns:PMD_HECAT_DashboardModule_VirtualKeyboard="clr-namespace:PMD.HECAT.DashboardModule.VirtualKeyboard"
xmlns:System_Windows_Controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit"
xmlns:PMD_HECAT_DashboardModule_Input="clr-namespace:PMD.HECAT.DashboardModule.Input"
xmlns:control="clr-namespace:PMD.HECAT.DashboardModule.Controls"
x:Class="PMD.HECAT.DashboardModule.CandidateElectrodeView"
x:Name="UserControl"
mc:Ignorable="d"
d:DesignWidth="1024" d:DesignHeight="768" Width="640" Height="360">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../Themes/DashboardStyles.xaml" />
<ResourceDictionary Source="../Themes/ImageButtons.xaml" />
<ResourceDictionary Source="CandidateViewResources.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<UserControl.Triggers>
<EventTrigger RoutedEvent="PMD_HECAT_DashboardModule_VirtualKeyboard:VirtualKeyboardView.KeyboardClose" SourceName="virtualKeyboardView">
<BeginStoryboard Storyboard="{StaticResource OnKeyboardClose1}"/>
</EventTrigger>
</UserControl.Triggers>
<Canvas Width="100" HorizontalAlignment="Left">
<PMD_HECAT_DashboardModule_VirtualKeyboard:VirtualKeyboardView x:Name="virtualKeyboardView" Height="222" Width="550" RenderTransformOrigin="0.5,0.5" Opacity="0" Active="False">
<PMD_HECAT_DashboardModule_VirtualKeyboard:VirtualKeyboardView.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform X="40" Y="400"/>
</TransformGroup>
</PMD_HECAT_DashboardModule_VirtualKeyboard:VirtualKeyboardView.RenderTransform>
</PMD_HECAT_DashboardModule_VirtualKeyboard:VirtualKeyboardView>
<Rectangle Stroke="White" Opacity="0.7" Fill="White" Height="370" Width="654.851" Canvas.Left="687" Canvas.Top="0" />
</Canvas>
</UserControl>
什麼樣的轉換應用於控制? LayoutTransform或/和RenderTransform? 「汽車大小」是什麼意思? –
@Erno - 老實說我不完全確定。我是新來的,我比WPF新,而且還沒有掌握佈局工具。看起來UserControl是在一個Canvas裏面的,它被配置爲在寬度和高度上伸展 –
然後向我們顯示代碼,這樣我們可以提供幫助。 –