我有这个特殊的问题。我有一个用户控件。我正在为Windows 8.1制作一个应用程序,我会从我的图片库中选择一个图像。图像将在我的应用程序中打开,Stretch是Uniform and Horizontal和垂直对齐到中心。
我的用户控件将出现在我点按图片的位置。现在的问题是,当图像Stretch为none时,我能够放大正确的区域(在我的点击周围),但现在当我将拉伸变为 Uniform 时将水平和垂直对齐设置为中心,我在用户控件中获取其他像素信息。
我想知道如何修复它。无论如何,图像也可以是2 *全高清,或者它们可以是高清甚至更低。 其次,我想知道图像的边界。有了边界我想说,我的用户控件不应该超出图像的边界。 如何实现。如果需要我的代码,我会粘贴它,如果需要的话。
请将此video作为参考。这就是我必须要发展的!我准备好了用户控件,我得到 Stretch = NONE的精确像素,并且没有设置水平和垂直对齐。
这是我的app
的代码答案 0 :(得分:0)
我认为问题在于你如何使用控件,而不是图像。如果你避免进行位图裁剪和替换,它会显着加速,并且可能适用于所有拉伸类型。
我修改了源代码以显示此信息 - 完全删除了Cropping。如果由于其他原因需要裁剪,则应考虑使用unsafe关键字(以及允许的属性设置),以便大大加快其使用。
另外,为了避免滞后/跳跃,我添加了IsHitTestVisible =“False”,这样您的delta就不会被悬停在图像上而中断。
我看到你已经拥有了45度的代码 - 因为它不在你的源头,我只添加了一个90度旋转的例子,当你到达两侧时 - 所以你可以看到如何设置一个RenderTransformOrigin点。
MainPage.xaml中:
<Page x:Name="page1"
x:Class="controlMagnifier.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:controlMagnifier"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid x:Name="ParentGrid" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" PointerReleased="ParentGrid_OnPointerReleased" >
<Canvas x:Name="InkPresenter" Height="auto" Width="auto">
<Image Stretch="Uniform" x:Name="image2" >
<Image.Source >
<BitmapImage UriSource="/Assets/wallpaper.jpg" />
</Image.Source>
</Image>
</Canvas>
<local:MagnifierUsercontrol x:Name="MagnifyTip" Visibility="Collapsed" ManipulationMode="All"
IsHitTestVisible="False" Height="227" Width="171"
VerticalContentAlignment="Bottom" HorizontalContentAlignment="Center">
</local:MagnifierUsercontrol>
</Grid>
</Page>
MainPage.xaml.cs中:
using System;
using Windows.Foundation;
using Windows.Storage;
using Windows.UI.Input;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
namespace controlMagnifier
{
public sealed partial class MainPage : Page
{
public const int XAxis = 200;
public const int YAxis = 435;
private readonly RotateTransform myRotateTransform = new RotateTransform {CenterX = 0.5, CenterY = 1};
private readonly ScaleTransform myScaleTransform = new ScaleTransform {ScaleX = 1, ScaleY = 1};
private readonly TransformGroup myTransformGroup = new TransformGroup();
private readonly TranslateTransform myTranslateTransform = new TranslateTransform();
public WriteableBitmap CurrentBitmapObj, CurrentCroppedImage = null;
public Point currentContactPt, GridPoint;
public Thickness margin;
public PointerPoint pt;
public double xValue, yValue;
public MainPage()
{
InitializeComponent();
ParentGrid.Holding += Grid_Holding;
image2.PointerMoved += InkCanvas_PointerMoved;
image2.PointerReleased += ParentGrid_OnPointerReleased;
margin = MagnifyTip.Margin;
image2.CacheMode = new BitmapCache();
myTransformGroup.Children.Add(myScaleTransform);
myTransformGroup.Children.Add(myRotateTransform);
myTransformGroup.Children.Add(myTranslateTransform);
MagnifyTip.RenderTransformOrigin = new Point(0.5, 1);
MagnifyTip.RenderTransform = myTransformGroup;
}
private void Grid_Holding(object sender, HoldingRoutedEventArgs e)
{
try
{
GridPoint = e.GetPosition(image2);
myTranslateTransform.X = xValue - XAxis;
myTranslateTransform.Y = yValue - YAxis;
MagnifyTip.RenderTransform = myTransformGroup;
MagnifyTip.Visibility = Visibility.Visible;
}
catch (Exception)
{
throw;
}
}
private void InkCanvas_PointerMoved(object sender, PointerRoutedEventArgs e)
{
try
{
pt = e.GetCurrentPoint(image2);
currentContactPt = pt.Position;
xValue = currentContactPt.X;
yValue = currentContactPt.Y;
if (xValue > 300)
{
myRotateTransform.Angle = -90;
}
else if (xValue < 100)
{
myRotateTransform.Angle = 90;
}
else
{
myRotateTransform.Angle = 0;
}
MagnifyTip.RenderTransform = myRotateTransform;
myTranslateTransform.X = xValue - XAxis;
myTranslateTransform.Y = yValue - YAxis;
MagnifyTip.RenderTransform = myTransformGroup;
}
catch (Exception)
{
throw;
}
finally
{
e.Handled = true;
}
}
private async void StoreCrrentImage()
{
try
{
var storageFile =
await
StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/wallpaper.jpg",
UriKind.RelativeOrAbsolute));
using (
var fileStream =
await storageFile.OpenAsync(FileAccessMode.Read))
{
var bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(fileStream);
var writeableBitmap =
new WriteableBitmap(bitmapImage.PixelWidth, bitmapImage.PixelHeight);
fileStream.Seek(0);
await writeableBitmap.SetSourceAsync(fileStream);
CurrentBitmapObj = writeableBitmap;
writeableBitmap.Invalidate();
}
}
catch (Exception)
{
// Graphics g=new Graphics();
throw;
}
finally
{
}
}
private void ParentGrid_OnPointerReleased(object sender, PointerRoutedEventArgs e)
{
MagnifyTip.Visibility = Visibility.Collapsed;
}
}
}
MagnifierUsercontrol.xaml:
<UserControl
x:Class="controlMagnifier.MagnifierUsercontrol"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:controlMagnifier"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" Height="227" Width="171">
<Canvas x:Name="controlCanvas" x:FieldModifier="public" Height="Auto" Width="Auto" >
<Grid Height="227" Width="171" HorizontalAlignment="Center" Canvas.Left="0" Canvas.Top="0">
<Border x:FieldModifier="public" x:Name="imgBorder" Width="150" CornerRadius="50,50,50,50" Margin="13,25,13,97">
<Border.Background>
<ImageBrush x:FieldModifier="public" x:Name="image1" />
</Border.Background>
</Border>
<TextBlock x:Name="txtreading" Height="30" Width="80" Margin="0,-145,0,0" FontWeight="Bold" Foreground="Red" FontSize="20" Text="ABC" TextAlignment="Center" />
<!--<Image Height="120" Width="150" Margin="0,-50,0,0" Source="Assets/SmallLogo.scale-100.png" ></Image>-->
<Path x:Name="MagnifyTip" Data="M25.533,0C15.457,0,7.262,8.199,7.262,18.271c0,9.461,13.676,19.698,17.63,32.338 c0.085,0.273,0.34,0.459,0.626,0.457c0.287-0.004,0.538-0.192,0.619-0.467c3.836-12.951,17.666-22.856,17.667-32.33 C43.803,8.199,35.607,0,25.533,0z M25.533,32.131c-7.9,0-14.328-6.429-14.328-14.328c0-7.9,6.428-14.328,14.328-14.328 c7.898,0,14.327,6.428,14.327,14.328C39.86,25.702,33.431,32.131,25.533,32.131z" Fill="#FFF4F4F5" Stretch="Fill" Stroke="Black" UseLayoutRounding="False" Height="227" Width="171" />
</Grid>
</Canvas>
</UserControl>
请告诉我这是否有帮助,或者是否有进一步针对您的具体问题。