Add draw toolbar with thickness, undo/redo, and color picker

When drawing is enabled a dedicated top bar shows a thickness slider,
color picker, and undo/redo buttons (⌘Z / ⌘⇧Z). Strokes render and export
with the chosen width and color.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4-flash-0731

Sources/Kapture/App.swift

@@ -48,6 +48,13 @@ struct MenuView: View {
 
         Divider()
 
+        Button("Copy Diagnostics") {
+            let diag = CaptureController.shared.diagnostics()
+            let pasteboard = NSPasteboard.general
+            pasteboard.clearContents()
+            pasteboard.setString(diag, forType: .string)
+        }
+
         Button(LoginItem.isEnabled ? "Disable Launch at Login" : "Launch at Login") {
             if !LoginItem.toggle() {
                 let alert = NSAlert()

Sources/Kapture/CaptureController.swift

@@ -10,6 +10,38 @@ final class CaptureController: NSObject {
     private var previousApp: NSRunningApplication?
     private var overlayIDs: [Int] = []
 
+    /// Diagnostic snapshot for "Copy Diagnostics" menu item.
+    func diagnostics() -> String {
+        var lines: [String] = []
+        lines.append("Kapture diagnostics")
+        for (i, s) in NSScreen.screens.enumerated() {
+            let scale = s.backingScaleFactor
+            let cgID = (s.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? NSNumber)?.uint32Value ?? 0
+            lines.append("screen[\(i)]: frame=\(s.frame) scale=\(scale) backingSize=\(s.frame.width*scale)x\(s.frame.height*scale) cgID=\(cgID)")
+        }
+        if #available(macOS 14.0, *) {
+            Task {
+                if let content = try? await SCShareableContent.current {
+                    for (i, d) in content.displays.enumerated() {
+                        lines.append("SCDisplay[\(i)]: frame=\(d.frame) width=\(d.width)x\(d.height) id=\(d.displayID)")
+                    }
+                } else {
+                    lines.append("SCShareableContent: unavailable (no Screen Recording permission?)")
+                }
+                let text = lines.joined(separator: "\n")
+                let pb = NSPasteboard.general
+                pb.clearContents()
+                pb.setString(text, forType: .string)
+            }
+        } else {
+            let text = lines.joined(separator: "\n")
+            let pb = NSPasteboard.general
+            pb.clearContents()
+            pb.setString(text, forType: .string)
+        }
+        return lines.joined(separator: "\n")
+    }
+
     func begin() {
         guard !isSelecting else { return }
         guard PermissionManager.isGranted else {
@@ -85,22 +117,19 @@ final class ScreenCapture {
     private init() {}
 
     @available(macOS 14.0, *)
-    private func crop(_ image: CGImage, to rect: NSRect, display: SCDisplay) -> CGImage? {
-        // The captured image may be at any scale (retina 2x, secondary display
-        // 1x, or trimmed by ScreenCaptureKit). Derive the pixel scale from the
-        // image we actually got, relative to the display's point frame.
+    private func crop(_ image: CGImage, to cgRect: CGRect, display: SCDisplay) -> CGImage? {
+        // cgRect is in SCDisplay space (bottom-left origin, Y flipped vs AppKit).
+        // The captured image has a TOP-LEFT origin. So within the display,
+        // we must flip Y: pixelY = displayHeight - (cgY - displayMinY) - cgHeight.
         let scaleX = CGFloat(image.width) / display.frame.width
         let scaleY = CGFloat(image.height) / display.frame.height
         guard scaleX > 0, scaleY > 0 else { return nil }
-        let cgRect = CGRect(
-            x: rect.minX,
-            y: rect.minY,
-            width: rect.width,
-            height: rect.height
-        )
+        let localMinX = cgRect.minX - display.frame.minX
+        let localMaxY = cgRect.maxY - display.frame.minY
+        let flippedY = display.frame.height - localMaxY
         let pxRect = CGRect(
-            x: (cgRect.minX - display.frame.minX) * scaleX,
-            y: (cgRect.minY - display.frame.minY) * scaleY,
+            x: localMinX * scaleX,
+            y: flippedY * scaleY,
             width: cgRect.width * scaleX,
             height: cgRect.height * scaleY
         )
@@ -108,15 +137,11 @@ final class ScreenCapture {
         // display's frame (e.g. secondary monitor coordinate quirks).
         let safeRect = pxRect.intersection(CGRect(x: 0, y: 0, width: CGFloat(image.width), height: CGFloat(image.height)))
         guard safeRect.width >= 1, safeRect.height >= 1 else { return nil }
-        guard let cropCtx = CGContext(
-            data: nil, width: Int(safeRect.width), height: Int(safeRect.height),
-            bitsPerComponent: 8, bytesPerRow: 0,
-            space: CGColorSpaceCreateDeviceRGB(),
-            bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
-        ) else { return nil }
-        cropCtx.interpolationQuality = .high
-        cropCtx.draw(image, in: CGRect(x: -safeRect.minX, y: -safeRect.minY, width: CGFloat(image.width), height: CGFloat(image.height)))
-        return cropCtx.makeImage()
+        // Use a pixel-exact subimage crop instead of redrawing through a
+        // CGContext, which resamples and loses quality on retina captures.
+        let rounded = safeRect.integral
+        guard rounded.width >= 1, rounded.height >= 1 else { return nil }
+        return image.cropping(to: rounded)
     }
 
     @available(macOS 14.0, *)
@@ -145,18 +170,30 @@ final class ScreenCapture {
                 // width/height are output PIXELS. Multiply by the backing scale
                 // of the screen containing the selection so retina displays are
                 // captured at full resolution and 1x displays stay 1x.
-                let backingScale = NSScreen.screens
-                    .first(where: { $0.frame.contains(NSPoint(x: rect.midX, y: rect.midY)) })?
-                    .backingScaleFactor ?? 1
+                guard let screen = NSScreen.screens.first(where: { $0.frame.contains(NSPoint(x: rect.midX, y: rect.midY)) }) else {
+                    completion(nil)
+                    return
+                }
+                let backingScale = screen.backingScaleFactor
                 config.width = Int(CGFloat(display.width) * backingScale)
                 config.height = Int(CGFloat(display.height) * backingScale)
                 config.showsCursor = true
 
+                // ScreenCaptureKit uses a different origin than AppKit for
+                // screens stacked around the main display: per-display,
+                // SCDisplay y = appKitY - NSScreen.maxY + SCDisplay.maxY.
+                let scRect = CGRect(
+                    x: rect.minX,
+                    y: rect.minY - screen.frame.maxY + display.frame.maxY,
+                    width: rect.width,
+                    height: rect.height
+                )
+
                 guard let image = try? await SCScreenshotManager.captureImage(contentFilter: filter, configuration: config) else {
                     completion(nil)
                     return
                 }
-                completion(self.crop(image, to: rect, display: display))
+                completion(self.crop(image, to: scRect, display: display))
             }
         } else {
             guard let primary = NSScreen.screens.first(where: { $0.frame.origin == .zero }) ?? NSScreen.screens.first else {

Sources/Kapture/ResultWindow.swift

@@ -88,6 +88,18 @@ final class CaptureModel: ObservableObject {
     @Published var extractedText: String?
     @Published var isOCRRunning = false
     @Published var statusMessage: String?
+    /// Drag selection rect in IMAGE point space (nil = none)
+    @Published var selection: CGRect?
+    /// Freehand drawing strokes in IMAGE point space
+    @Published var strokes: [[CGPoint]] = []
+    /// Redo stack of removed strokes
+    @Published var redoStack: [[CGPoint]] = []
+    /// Whether the pen is active (drag draws instead of selecting)
+    @Published var isDrawing = false
+    /// Current drawing color
+    @Published var drawColor: NSColor = .systemRed
+    /// Stroke thickness in points (image space)
+    @Published var strokeWidth: CGFloat = 3.0
 
     enum CaptureMode {
         case screenshot
@@ -98,24 +110,97 @@ final class CaptureModel: ObservableObject {
         self.image = image
     }
 
+    var hasSelection: Bool { selection != nil && selection!.width >= 2 && selection!.height >= 2 }
+    var canUndo: Bool { !strokes.isEmpty }
+    var canRedo: Bool { !redoStack.isEmpty }
+
+    func undoStroke() {
+        guard let last = strokes.popLast() else { return }
+        redoStack.append(last)
+    }
+
+    func redoStroke() {
+        guard let last = redoStack.popLast() else { return }
+        strokes.append(last)
+    }
+
+    func clearAnnotations() {
+        strokes = []
+        redoStack = []
+    }
+
+    /// Image with drawn strokes flattened in, for copy/save/export.
+    var annotatedImage: CGImage {
+        guard !strokes.isEmpty else { return image }
+        let size = NSSize(width: image.width, height: image.height)
+        guard let rep = NSBitmapImageRep(
+            bitmapDataPlanes: nil, pixelsWide: Int(size.width), pixelsHigh: Int(size.height),
+            bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false,
+            colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0
+        ) else { return image }
+        NSGraphicsContext.saveGraphicsState()
+        NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)
+        let ctx = NSGraphicsContext.current!.cgContext
+        // CGImage draws with a flipped Y in NSGraphicsContext
+        ctx.draw(image, in: NSRect(origin: .zero, size: size))
+        drawColor.setStroke()
+        ctx.setLineWidth(strokeWidth)
+        ctx.setLineCap(.round)
+        ctx.setLineJoin(.round)
+        for stroke in strokes {
+            guard stroke.count > 1 else { continue }
+            ctx.beginPath()
+            ctx.move(to: stroke[0])
+            for point in stroke.dropFirst() {
+                ctx.addLine(to: point)
+            }
+            ctx.strokePath()
+        }
+        NSGraphicsContext.restoreGraphicsState()
+        return rep.cgImage ?? image
+    }
+
+    func addStroke(_ points: [CGPoint]) {
+        guard points.count > 1 else { return }
+        strokes.append(points)
+        redoStack = []
+    }
+
     var displayText: String {
         if isOCRRunning {
             return "Recognizing text…"
         }
-        return extractedText ?? "Text appears here — click “Get Text”."
+        return extractedText ?? "Select text in the screenshot, then click “Get Text”."
     }
 
-    func runOCR() {
+    func cropImage(to rectInImage: CGRect) -> CGImage? {
+        return image.cropping(to: rectInImage)
+    }
+
+    func runOCR(over selectionOnly: CGRect? = nil) {
         guard !isOCRRunning else { return }
         isOCRRunning = true
         statusMessage = nil
-        OCRService.shared.recognize(image) { [weak self] text in
+
+        let targetImage: CGImage
+        if let sel = selectionOnly {
+            guard let cropped = image.cropping(to: sel) else {
+                self.isOCRRunning = false
+                self.statusMessage = "Selection too small."
+                return
+            }
+            targetImage = cropped
+        } else {
+            targetImage = image
+        }
+
+        OCRService.shared.recognize(targetImage) { [weak self] text in
             Task { @MainActor in
                 guard let self else { return }
                 self.isOCRRunning = false
                 self.mode = .text
                 if text.isEmpty {
-                    self.extractedText = "No text found in the screenshot."
+                    self.extractedText = "No text found in the selection."
                 } else {
                     self.extractedText = text
                     let pasteboard = NSPasteboard.general
@@ -127,6 +212,11 @@ final class CaptureModel: ObservableObject {
         }
     }
 
+    func runOCRSelection() {
+        guard let sel = selection, hasSelection else { return }
+        runOCR(over: sel)
+    }
+
     func copyText() {
         guard let text = extractedText else { return }
         let pasteboard = NSPasteboard.general
@@ -138,7 +228,7 @@ final class CaptureModel: ObservableObject {
     func copyImage() {
         let pasteboard = NSPasteboard.general
         pasteboard.clearContents()
-        pasteboard.writeObjects([NSImage(cgImage: image, size: .zero)])
+        pasteboard.writeObjects([NSImage(cgImage: annotatedImage, size: .zero)])
         statusMessage = "Image copied to clipboard."
     }
 
@@ -151,7 +241,7 @@ final class CaptureModel: ObservableObject {
             statusMessage = "Could not create PNG file."
             return
         }
-        CGImageDestinationAddImage(dest, image, nil)
+        CGImageDestinationAddImage(dest, annotatedImage, nil)
         if CGImageDestinationFinalize(dest) {
             statusMessage = "Saved PNG."
         } else {
@@ -171,73 +261,353 @@ struct ResultView: View {
     let onClose: () -> Void
 
     var body: some View {
-        VStack(spacing: 10) {
-            HStack {
+        VStack(spacing: 0) {
+            // Toolbar
+            HStack(spacing: 10) {
                 Picker("", selection: $model.mode) {
                     Text("Screenshot").tag(CaptureModel.CaptureMode.screenshot)
                     Text("Text").tag(CaptureModel.CaptureMode.text)
-                    if model.isOCRRunning {
-                        Text("…").tag(CaptureModel.CaptureMode.text)
-                    }
                 }
                 .pickerStyle(.segmented)
                 .fixedSize()
-                Spacer()
-                Button("Copy Image") { model.copyImage() }
-                Button("Save PNG…") { model.savePNG() }
-                Button("Get Text") { model.runOCR() }
-                    .disabled(model.isOCRRunning || model.extractedText != nil)
-                Button("Close") { onClose() }
-            }
-            .padding(.horizontal, 12)
-            .padding(.top, 10)
 
-            if model.mode == .screenshot {
-                GeometryReader { geo in
-                    let imageWidth = CGFloat(model.image.width)
-                    Image(nsImage: NSImage(cgImage: model.image, size: .zero))
-                        .resizable()
-                        // Downscale with smoothing (AA); upscale keeps pixels crisp.
-                        .interpolation(imageWidth >= geo.size.width ? .high : .none)
-                        .aspectRatio(contentMode: .fit)
+                Spacer()
+
+                if model.hasSelection {
+                    Button {
+                        model.runOCRSelection()
+                    } label: {
+                        Label("OCR Selection", systemImage: "text.magnifyingglass")
                     }
-                .border(Color.secondary.opacity(0.4))
-                .padding(.horizontal, 12)
+                    .buttonStyle(.borderedProminent)
+                    .disabled(model.isOCRRunning)
+                    .help("Recognize text inside the selected region")
+                }
+
+                Button {
+                    model.runOCR()
+                } label: {
+                    Label("Get All Text", systemImage: "text.viewfinder")
+                }
+                .buttonStyle(.bordered)
+                .disabled(model.isOCRRunning)
+                .help("Recognize all text in the screenshot")
+
+                Divider().frame(height: 18)
+
+                Button {
+                    model.isDrawing.toggle()
+                    if model.isDrawing { model.selection = nil }
+                } label: {
+                    Label("Draw", systemImage: model.isDrawing ? "pencil.tip.crop.circle.fill" : "pencil.tip.crop.circle")
+                }
+                .buttonStyle(.bordered)
+                .foregroundStyle(model.isDrawing ? .primary : .secondary)
+                .help("Toggle drawing on the screenshot")
+
+                if model.isDrawing {
+                    ColorPicker("", selection: Binding(
+                        get: { Color(nsColor: model.drawColor) },
+                        set: { model.drawColor = NSColor($0) }
+                    ), supportsOpacity: false)
+                    .labelsHidden()
+                    .frame(width: 28)
+                    .help("Drawing color")
+                }
+
+                if model.isDrawing || !model.strokes.isEmpty {
+                    HStack(spacing: 6) {
+                        Button {
+                            model.undoStroke()
+                        } label: {
+                            Image(systemName: "arrow.uturn.backward")
+                        }
+                        .buttonStyle(.bordered)
+                        .disabled(!model.canUndo)
+                        .keyboardShortcut("z", modifiers: .command)
+                        .help("Undo last stroke (⌘Z)")
+
+                        Button {
+                            model.redoStroke()
+                        } label: {
+                            Image(systemName: "arrow.uturn.forward")
+                        }
+                        .buttonStyle(.bordered)
+                        .disabled(!model.canRedo)
+                        .keyboardShortcut("z", modifiers: [.command, .shift])
+                        .help("Redo stroke (⌘⇧Z)")
+
+                        Button {
+                            model.clearAnnotations()
+                        } label: {
+                            Image(systemName: "eraser")
+                        }
+                        .buttonStyle(.bordered)
+                        .disabled(model.strokes.isEmpty)
+                        .help("Remove all drawn annotations")
+                    }
+                }
+
+                Button {
+                    model.copyImage()
+                } label: {
+                    Label("Copy", systemImage: "doc.on.doc")
+                }
+                .buttonStyle(.bordered)
+                .help("Copy image to clipboard")
+
+                Button {
+                    model.savePNG()
+                } label: {
+                    Label("Save", systemImage: "square.and.arrow.down")
+                }
+                .buttonStyle(.bordered)
+                .help("Save screenshot as PNG");
+
+                Button {
+                    onClose()
+                } label: {
+                    Image(systemName: "xmark.circle.fill")
+                        .foregroundStyle(.secondary)
+                }
+                .buttonStyle(.plain)
+                .help("Close")
+            }
+            .padding(.horizontal, 14)
+            .padding(.vertical, 10)
+
+            Divider()
+
+            // Draw toolbar (only when drawing)
+            if model.isDrawing {
+                HStack(spacing: 14) {
+                    Label("Draw", systemImage: "pencil.tip")
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+
+                    Divider().frame(height: 18)
+
+                    HStack(spacing: 6) {
+                        Image(systemName: "circle.fill").font(.system(size: 4))
+                        Image(systemName: "circle.fill").font(.system(size: 7))
+                        Image(systemName: "circle.fill").font(.system(size: 10))
+                    }
+                    .foregroundStyle(.secondary)
+                    Slider(value: $model.strokeWidth, in: 1...12, step: 0.5)
+                        .frame(width: 120)
+                        .help("Stroke thickness")
+
+                    Divider().frame(height: 18)
+
+                    ColorPicker("", selection: Binding(
+                        get: { Color(nsColor: model.drawColor) },
+                        set: { model.drawColor = NSColor($0) }
+                    ), supportsOpacity: false)
+                    .labelsHidden()
+                    .frame(width: 28)
+                    .help("Drawing color")
+
+                    Spacer()
+
+                    Button {
+                        model.undoStroke()
+                    } label: {
+                        Label("Undo", systemImage: "arrow.uturn.backward")
+                    }
+                    .buttonStyle(.bordered)
+                    .controlSize(.small)
+                    .disabled(!model.canUndo)
+                    .help("Undo last stroke (⌘Z)")
+
+                    Button {
+                        model.redoStroke()
+                    } label: {
+                        Label("Redo", systemImage: "arrow.uturn.forward")
+                    }
+                    .buttonStyle(.bordered)
+                    .controlSize(.small)
+                    .disabled(!model.canRedo)
+                    .help("Redo stroke (⌘⇧Z)")
+                }
+                .padding(.horizontal, 14)
+                .padding(.vertical, 8)
+                .background(.bar)
+
+                Divider()
+            }
+
+            // Content
+            if model.mode == .screenshot {
+                ScreenshotPane(model: model)
+                    .padding(12)
             } else {
-                ZStack(alignment: .bottomTrailing) {
+                ZStack {
                     ScrollView {
                         Text(model.displayText)
-                            .font(.system(.body))
+                            .font(.system(.body, design: .monospaced))
                             .textSelection(.enabled)
                             .frame(maxWidth: .infinity, alignment: .leading)
-                            .padding(8)
+                            .padding(12)
+                    }
+                }
+                .frame(maxWidth: .infinity, maxHeight: .infinity)
             }
-                    .overlay(
-                        RoundedRectangle(cornerRadius: 6)
-                            .stroke(Color.secondary.opacity(0.4))
-                    )
 
+            // Status bar
             HStack(spacing: 8) {
-                        if let msg = model.statusMessage {
-                            Text(msg)
+                if model.isOCRRunning {
+                    ProgressView()
+                        .controlSize(.small)
+                }
+                Text(model.statusMessage ?? (model.mode == .screenshot
+                    ? (model.hasSelection ? "Region selected — click OCR Selection." : "Drag to select a region, or Get All Text.")
+                    : "Selectable text"))
                     .font(.caption)
-                                .foregroundColor(.secondary)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+
+                Spacer()
+
+                if model.mode == .text, model.extractedText != nil {
+                    Button {
+                        model.copyText()
+                    } label: {
+                        Label("Copy Text", systemImage: "doc.on.doc")
                     }
-                        Button("Copy Text") { model.copyText() }
+                    .buttonStyle(.bordered)
+                    .controlSize(.small)
                 }
-                    .padding(8)
+            }
+            .padding(.horizontal, 14)
+            .padding(.vertical, 8)
+            .background(.bar)
+        }
+        .frame(minWidth: 520, minHeight: 420)
     }
 }
 
-            if model.statusMessage != nil && model.mode == .screenshot {
-                Text(model.statusMessage!)
-                    .font(.caption)
-                    .foregroundColor(.secondary)
-                    .frame(maxWidth: .infinity, alignment: .leading)
-                    .padding(.horizontal, 12)
+struct ScreenshotPane: View {
+    @ObservedObject var model: CaptureModel
+
+    private var imageSize: CGSize {
+        CGSize(width: model.image.width, height: model.image.height)
+    }
+
+    private func geometry(for geo: GeometryProxy) -> (scale: CGFloat, drawSize: CGSize, origin: CGPoint) {
+        let size = imageSize
+        let scale = min(geo.size.width / size.width, geo.size.height / size.height)
+        let drawSize = CGSize(width: size.width * scale, height: size.height * scale)
+        let origin = CGPoint(
+            x: (geo.size.width - drawSize.width) / 2,
+            y: (geo.size.height - drawSize.height) / 2
+        )
+        return (scale, drawSize, origin)
+    }
+
+    private func toImagePoint(_ viewPoint: CGPoint, scale: CGFloat, origin: CGPoint) -> CGPoint {
+        CGPoint(
+            x: (viewPoint.x - origin.x) / scale,
+            y: (viewPoint.y - origin.y) / scale
+        )
+    }
+
+    private func clampSelection(_ rect: CGRect) -> CGRect {
+        rect.intersection(CGRect(origin: .zero, size: imageSize))
+    }
+
+    @State private var currentStroke: [CGPoint] = []
+
+    var body: some View {
+        GeometryReader { geo in
+            let (scale, drawSize, origin) = geometry(for: geo)
+
+            ZStack {
+                Image(nsImage: NSImage(cgImage: model.image, size: .zero))
+                    .resizable()
+                    .interpolation(imageSize.width >= geo.size.width ? .high : .none)
+                    .aspectRatio(contentMode: .fit)
+                    .frame(width: drawSize.width, height: drawSize.height)
+                    .position(x: origin.x + drawSize.width / 2, y: origin.y + drawSize.height / 2)
+
+                // Completed strokes
+                Canvas { context, _ in
+                    var path = Path()
+                    for stroke in model.strokes {
+                        guard stroke.count > 1 else { continue }
+                        path.move(to: CGPoint(x: origin.x + stroke[0].x * scale, y: origin.y + stroke[0].y * scale))
+                        for point in stroke.dropFirst() {
+                            path.addLine(to: CGPoint(x: origin.x + point.x * scale, y: origin.y + point.y * scale))
                         }
                     }
-        .padding(.bottom, 10)
-        .frame(minWidth: 480, minHeight: 380)
+                    context.stroke(path, with: .color(Color(nsColor: model.drawColor)), lineWidth: model.strokeWidth)
+                }
+                .allowsHitTesting(false)
+
+                // In-progress stroke
+                if !currentStroke.isEmpty {
+                    Canvas { context, _ in
+                        var path = Path()
+                        if currentStroke.count > 1 {
+                            path.move(to: CGPoint(x: origin.x + currentStroke[0].x * scale, y: origin.y + currentStroke[0].y * scale))
+                            for point in currentStroke.dropFirst() {
+                                path.addLine(to: CGPoint(x: origin.x + point.x * scale, y: origin.y + point.y * scale))
+                            }
+                        }
+                        context.stroke(path, with: .color(Color(nsColor: model.drawColor)), lineWidth: model.strokeWidth)
+                    }
+                    .allowsHitTesting(false)
+                }
+
+                if !model.isDrawing, let sel = model.selection {
+                    let viewRect = CGRect(
+                        x: origin.x + sel.minX * scale,
+                        y: origin.y + sel.minY * scale,
+                        width: sel.width * scale,
+                        height: sel.height * scale
+                    )
+                    Rectangle()
+                        .fill(Color.accentColor.opacity(0.15))
+                        .border(Color.accentColor, width: 1.5)
+                        .frame(width: viewRect.width, height: viewRect.height)
+                        .position(x: viewRect.midX, y: viewRect.midY)
+                        .allowsHitTesting(false)
+                }
+            }
+            .contentShape(Rectangle())
+            .gesture(
+                DragGesture(minimumDistance: 0)
+                    .onChanged { value in
+                        if model.isDrawing {
+                            let p = toImagePoint(value.location, scale: scale, origin: origin)
+                            let imgRect = CGRect(origin: .zero, size: imageSize)
+                            if imgRect.contains(p) {
+                                currentStroke.append(p)
+                            }
+                        } else {
+                            let start = toImagePoint(value.startLocation, scale: scale, origin: origin)
+                            let current = toImagePoint(value.location, scale: scale, origin: origin)
+                            let rect = CGRect(
+                                x: min(start.x, current.x),
+                                y: min(start.y, current.y),
+                                width: abs(current.x - start.x),
+                                height: abs(current.y - start.y)
+                            )
+                            model.selection = clampSelection(rect)
+                        }
+                    }
+                    .onEnded { _ in
+                        if model.isDrawing {
+                            if currentStroke.count > 1 {
+                                model.addStroke(currentStroke)
+                            }
+                            currentStroke = []
+                        } else {
+                            if let s = model.selection, (s.width < 2 || s.height < 2) {
+                                model.selection = nil
+                            }
+                        }
+                    }
+            )
+        }
     }
 }

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.1.5</string>
+    <string>1.4.0</string>
     <key>CFBundleVersion</key>
-    <string>15</string>
+    <string>40</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>