C# 在WP8.1中缩放图像
我有一个使用以下代码的全屏图像:C# 在WP8.1中缩放图像,c#,xaml,windows-phone,windows-phone-8.1,C#,Xaml,Windows Phone,Windows Phone 8.1,我有一个使用以下代码的全屏图像: <phone:PhoneApplicationPage x:Class="solution.FullScreenViewer" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-na
<phone:PhoneApplicationPage
x:Class="solution.FullScreenViewer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="PortraitOrLandscape" Orientation="Portrait"
mc:Ignorable="d"
shell:SystemTray.IsVisible="True">
<Image Name="img" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"Stretch="Uniform"/>
</phone:PhoneApplicationPage>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
string context = this.NavigationContext.QueryString["context"];
img.Source = new BitmapImage(new Uri(context, UriKind.RelativeOrAbsolute));
base.OnNavigatedTo(e);
}
现在我想添加一个选项来缩放图片,但我不知道怎么做。我也尝试过用谷歌搜索它,但我发现的唯一一件事是在ScroolViewer中使用ZoomMode,这对我不起作用(它说ZoomMode的成员无法识别)
是否有其他放大解决方案?您应该能够以如下方式放大应用程序:
public static void ZoomToRatio(double ratio)
{
ScaleTransform transform = new ScaleTransform()
{
ScaleX = ratio,
ScaleY = ratio,
};
double height = 0.0;
double width = 0.0;
if (ratio < 1.0)
{
height = Application.Current.Host.Content.ActualHeight * ratio;
width = Application.Current.Host.Content.ActualWidth * ratio;
}
else
{
height = Application.Current.Host.Content.ActualHeight / ratio;
width = Application.Current.Host.Content.ActualWidth / ratio;
}
Application.Current.RootVisual.SetValue(Canvas.HeightProperty, height);
Application.Current.RootVisual.SetValue(Canvas.WidthProperty, width);
Application.Current.RootVisual.RenderTransform = transform;
}
publicstaticvoidzoomtoratio(双倍比率)
{
ScaleTransform转换=新的ScaleTransform()
{
ScaleX=比率,
ScaleY=比率,
};
双倍高度=0.0;
双倍宽度=0.0;
如果(比率<1.0)
{
高度=Application.Current.Host.Content.ActualHeight*比率;
宽度=Application.Current.Host.Content.ActualWidth*比率;
}
其他的
{
高度=Application.Current.Host.Content.ActualHeight/比率;
宽度=Application.Current.Host.Content.ActualWidth/比率;
}
Application.Current.RootVisual.SetValue(Canvas.HeightProperty,height);
Application.Current.RootVisual.SetValue(Canvas.WidthProperty,width);
Application.Current.RootVisual.RenderTransform=转换;
}
您可以使用一个内部有另一个网格的网格,而不是正在使用的图像。在第二个网格上,使用grid.RenderTransform
通过缩放变换调整网格内容(网格内的图像)的大小。
您可以使用operationdelta
事件跟踪何时放大或缩小
使用它,你可以把图片放大,但这并不是很好,因为你聚焦在图片的左上角。为了避免这种情况,您可以通过在“图像渲染变换”标记中添加“平移变换”,使用户能够滚动图像。您可以在下面的代码中看到如何做到这一点:
<Grid x:Name="LayoutRoot" ManipulationDelta="LayoutRoot_ManipulationDelta">
<Grid x:Name="ContentPanel">
<Grid x:Name="imageGrid">
<Grid.RenderTransform>
<ScaleTransform x:Name="ImageTransform" />
</Grid.RenderTransform>
<Image x:Name="img" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Stretch="Uniform" Source="/Resources/Logo/CTK .png"
ManipulationDelta="img_ManipulationDelta"
ManipulationCompleted="img_ManipulationCompleted">
<Image.RenderTransform>
<TranslateTransform x:Name="PanTransform"/>
</Image.RenderTransform>
<Image.Resources>
<Storyboard x:Name="Pan">
<DoubleAnimation x:Name="PanAnimation"
Storyboard.TargetName="PanTransform"
Storyboard.TargetProperty="X" Duration="0:0:1">
<DoubleAnimation.EasingFunction>
<CircleEase EasingMode="EaseOut" />
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
</Storyboard>
</Image.Resources>
</Image>
</Grid>
</Grid>
</Grid>
这是用于缩放和转换的C代码:
private void LayoutRoot_ManipulationDelta(object sender, System.Windows.Input.ManipulationDeltaEventArgs e)
{
if (e.DeltaManipulation.Scale.X > 0.0 && e.DeltaManipulation.Scale.Y > 0.0)
{
// Scale in the X direction
double tmp = ImageTransform.ScaleX * ((e.DeltaManipulation.Scale.X + e.DeltaManipulation.Scale.Y) / 2);
if (tmp < 1.0)
tmp = 1.0;
else if (tmp > 4.0)
tmp = 4.0;
ImageTransform.ScaleX = tmp;
// Scale in the Y direction
tmp = ImageTransform.ScaleY * ((e.DeltaManipulation.Scale.X + e.DeltaManipulation.Scale.Y) / 2);
if (tmp < 1.0)
tmp = 1.0;
else if (tmp > 4.0)
tmp = 4.0;
ImageTransform.ScaleY = tmp;
}
}
private void img_ManipulationDelta(object sender, System.Windows.Input.ManipulationDeltaEventArgs e)
{
// First make sure we're translating and not scaling (one finger vs. two)
if (e.DeltaManipulation.Scale.X == 0.0 && e.DeltaManipulation.Scale.Y == 0.0)
{
Image photo = sender as Image;
TranslateTransform transform = photo.RenderTransform as TranslateTransform;
// Compute the new X component of the transform
double x = transform.X + e.DeltaManipulation.Translation.X;
double y = transform.Y + e.DeltaManipulation.Translation.Y;
// Apply the computed value to the transform
transform.X = x;
transform.Y = y;
}
}
private void img_ManipulationCompleted(object sender, System.Windows.Input.ManipulationCompletedEventArgs e)
{
if (e.IsInertial)
{
Image photo = sender as Image;
// Compute the inertial distance to travel
double dx = e.FinalVelocities.LinearVelocity.X / 10.0;
double dy = e.FinalVelocities.LinearVelocity.Y / 10.0;
TranslateTransform transform = photo.RenderTransform as TranslateTransform;
double x = transform.X + dx;
double y = transform.Y + dy;
// Apply the computed value to the animation
PanAnimation.To = x;
// Trigger the animation
Pan.Begin();
}
}
private void LayoutRoot\u操纵delta(对象发送方,System.Windows.Input.操纵deltaeventargs e)
{
if(e.DeltaManipulation.Scale.X>0.0&&e.DeltaManipulation.Scale.Y>0.0)
{
//在X方向上缩放
double tmp=ImageTransform.ScaleX*((e.DeltaManipulation.Scale.X+e.DeltaManipulation.Scale.Y)/2);
如果(tmp<1.0)
tmp=1.0;
否则如果(tmp>4.0)
tmp=4.0;
ImageTransform.ScaleX=tmp;
//在Y方向上缩放
tmp=ImageTransform.ScaleY*((e.DeltaManipulation.Scale.X+e.DeltaManipulation.Scale.Y)/2);
如果(tmp<1.0)
tmp=1.0;
否则如果(tmp>4.0)
tmp=4.0;
ImageTransform.ScaleY=tmp;
}
}
私有无效img_操纵增量(对象发送方,System.Windows.Input.ManipulationDeltaEventArgs e)
{
//首先确保我们正在平移,而不是缩放(一个手指与两个手指)
if(e.DeltaManipulation.Scale.X==0.0&&e.DeltaManipulation.Scale.Y==0.0)
{
图像照片=发送者作为图像;
TranslateTransform transform=photo.RenderTransform作为TranslateTransform;
//计算变换的新X分量
double x=transform.x+e.DeltaManipulation.Translation.x;
双y=transform.y+e.DeltaManipulation.Translation.y;
//将计算出的值应用于变换
变换X=X;
变换Y=Y;
}
}
私有无效img_操作已完成(对象发送方,System.Windows.Input.OperationCompletedEventArgs e)
{
如果(例如,IsInertial)
{
图像照片=发送者作为图像;
//计算行驶的惯性距离
双dx=e.finalvelocity.LinearVelocity.X/10.0;
双dy=e.finalvelocity.LinearVelocity.Y/10.0;
TranslateTransform transform=photo.RenderTransform作为TranslateTransform;
双x=变换.x+dx;
双y=transform.y+dy;
//将计算出的值应用于动画
PanAnimation.To=x;
//触发动画
Pan.Begin();
}
}
由于您的目标是SilverLight,您尝试过其中一种吗,谢谢你的详细回答,我现在就试试:)