checking-image-bounds-transform

# WPF Image Bounds Checking (With Transforms) A pattern for checking if mouse coordinates are within the image area and clamping coordinates to image bounds when Pan, Zoom, Rotate transforms are applied. ## 1. Problem Scenario ### Requirements - Measurement tools, annotation tools in image viewers should only work **within the image area** - Need accurate boundary detection even when image is zoomed, panned, or rotated ### Complexity - `Image` control position varies based on `Stretch="None"`, `HorizontalAlignment="Center"` settings - When `RenderTransform` applies Pan, Zoom, Rotate, calculating actual image position becomes complex --- ## 2. Solution Pattern ### 2.1 Image Bounds Check Method ```csharp namespace MyApp.Controls; using System.Windows; using System.Windows.Controls; using System.Windows.Media; public class ImageViewer : Control { // DependencyProperties (omitted) public ImageSource? ImageSource { get; set; } public double ZoomFactor { get; set; } = 1.0; public double PanX { get; set; } public double PanY { get; set; } public double RotationAngle { get; set; } /// <summary> /// Check if the given point is within the image area. /// </summary> /// <param name="point">Point in parent container coordinates</param> /// <returns>True if within image area</returns> public bool IsPointWithinImage(Point point) { if (ImageSource is null) return false; // 1. Original image size ...