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画像が境界線を含む境界内に完全に収まるように、パンを制限する方法を見つけようとしています。この点について何か助けていただければ幸いです。ありがとう....

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="MapTest.Window1"
    Title="PanTest"
    Width="484"
    Height="400"
    WindowStartupLocation="CenterScreen">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <TextBlock Margin="8,8,8,0"
               TextWrapping="Wrap">
        To pan the image, simply click on it then drag.  I'd like to 
        constrain the pan so that the image remains entirely within 
        the border, but without resorting to ClipToBounds.  Any help 
        in this regard would be greatly appreciated.  Thanks....</TextBlock>
    <Border x:Name="border"
            Margin="8"
            BorderBrush="Black"
            BorderThickness="1"
            Grid.Row="1">
        <Image x:Name="image"
               Source="Penguins.jpg"
               Opacity="1"
               Width="300"
               Height="300"
               Stretch="Uniform"
               RenderTransformOrigin="0.5,0.5" />
    </Border>
</Grid>


using System.Linq;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace MapTest
{
    public partial class Window1 : Window
    {
        private Point origin;
        private Point start;

        public Window1()
        {
            InitializeComponent();

            var group = new TransformGroup();

            group.Children.Add(new TranslateTransform());

            image.RenderTransform = group;

            image.MouseLeftButtonDown += image_MouseLeftButtonDown;
            image.MouseMove += image_MouseMove;
            image.MouseLeftButtonUp += image_MouseLeftButtonUp;
        }

        private void image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            image.ReleaseMouseCapture();
        }

        private void image_MouseMove(object sender, MouseEventArgs e)
        {
            if (!image.IsMouseCaptured) 
                return;

            var tt = (TranslateTransform)((TransformGroup)image.RenderTransform).
                Children.First(tr => tr is TranslateTransform);

            var vector = start - e.GetPosition(border);

            tt.X = origin.X - vector.X;
            tt.Y = origin.Y - vector.Y;
        }

        private void image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            image.CaptureMouse();

            var tt = (TranslateTransform)((TransformGroup)image.RenderTransform).
                Children.First(tr => tr is TranslateTransform);

            start = e.GetPosition(border);

            origin = new Point(tt.X, tt.Y);
        }
    }
}
4

1 に答える 1

3

次のコードは、変換された Image コントロールの境界を、Border コントロールを基準とした座標で示します。境界が Border コントロール内にあるかどうかを簡単に確認できます。

var rect = new Rect(image.RenderSize);
var bounds = image.TransformToAncestor(border).TransformBounds(rect);
于 2013-04-30T22:31:32.367 に答える