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使用像素尺寸，避免DPI不同导致DIP尺寸与实际像素不一致

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This commit is contained in:
李伟
2026-04-23 16:52:10 +08:00
parent 3aa64843c8
commit d5b421b811
2 changed files with 40 additions and 43 deletions
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XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+31 -26
View File
@@ -7,6 +7,7 @@ using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace XP.ImageProcessing.RoiControl.Controls
@@ -120,11 +121,17 @@ namespace XP.ImageProcessing.RoiControl.Controls
private static void OnImageSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = (PolygonRoiCanvas)d;
if (e.NewValue is ImageSource imageSource)
if (e.NewValue is BitmapSource bitmap)
{
// 使用像素尺寸，避免 DPI 不同导致 DIP 尺寸与实际像素不一致
control.CanvasWidth = bitmap.PixelWidth;
control.CanvasHeight = bitmap.PixelHeight;
control.ResetView();
}
else if (e.NewValue is ImageSource imageSource)
{
control.CanvasWidth = imageSource.Width;
control.CanvasHeight = imageSource.Height;
// 图像加载后自动适应窗口居中显示
control.ResetView();
}
}
@@ -411,35 +418,33 @@ namespace XP.ImageProcessing.RoiControl.Controls
public void ResetView()
{
// 自动适应显示窗口 (类似 PictureBox SizeMode.Zoom)
ZoomScale = 1.0;
PanOffsetX = 0;
PanOffsetY = 0;
if (imageDisplayGrid != null && CanvasWidth > 0 && CanvasHeight > 0)
if (imageDisplayGrid == null || CanvasWidth <= 0 || CanvasHeight <= 0)
{
// 使用 Dispatcher 延迟执行，确保布局已完成
Dispatcher.BeginInvoke(new Action(() =>
{
// 获取图像显示区域的实际尺寸
double viewportWidth = imageDisplayGrid.ActualWidth;
double viewportHeight = imageDisplayGrid.ActualHeight;
if (viewportWidth > 0 && viewportHeight > 0)
{
// 计算宽度和高度的缩放比例
double scaleX = viewportWidth / CanvasWidth;
double scaleY = viewportHeight / CanvasHeight;
// 选择较小的缩放比例，确保图像完全显示在窗口内（保持宽高比）
ZoomScale = Math.Min(scaleX, scaleY);
// 居中显示由 Grid 的 HorizontalAlignment 和 VerticalAlignment 自动处理
PanOffsetX = 0;
PanOffsetY = 0;
}
}), System.Windows.Threading.DispatcherPriority.Loaded);
ZoomScale = 1.0;
return;
}
// 延迟到布局完成后计算，确保 ActualWidth/Height 准确
Dispatcher.BeginInvoke(new Action(() =>
{
double viewW = imageDisplayGrid.ActualWidth;
double viewH = imageDisplayGrid.ActualHeight;
if (viewW > 0 && viewH > 0)
{
ZoomScale = Math.Min(viewW / CanvasWidth, viewH / CanvasHeight);
}
else
{
ZoomScale = 1.0;
}
PanOffsetX = 0;
PanOffsetY = 0;
}), System.Windows.Threading.DispatcherPriority.Render);
}
private void BtnZoomIn_Click(object sender, RoutedEventArgs e)