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80 lines
3.4 KiB
Swift
80 lines
3.4 KiB
Swift
// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import SwiftUI
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/// Displays the source image with bounding box polygon overlays drawn on a Canvas.
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///
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/// Polygon coordinates from `OCRResult.polygon` are in original image pixel space.
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/// This view computes the scale factor and offset to map them to the displayed
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/// image area, accounting for `.aspectFit` rendering within the available frame.
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struct ResultImageView: View {
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let image: UIImage
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let results: [OCRResult]
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var body: some View {
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GeometryReader { geo in
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let imageSize = image.size
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let imageAspect = imageSize.width / imageSize.height
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let viewAspect = geo.size.width / geo.size.height
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// Compute the actual rendered image rect within the GeometryReader frame
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let fitSize: CGSize = imageAspect > viewAspect
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? CGSize(width: geo.size.width, height: geo.size.width / imageAspect)
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: CGSize(width: geo.size.height * imageAspect, height: geo.size.height)
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let offset = CGPoint(
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x: (geo.size.width - fitSize.width) / 2,
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y: (geo.size.height - fitSize.height) / 2
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)
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let scale = fitSize.width / imageSize.width
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ZStack {
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Image(uiImage: image)
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.resizable()
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.aspectRatio(contentMode: .fit)
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Canvas { context, size in
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for result in results {
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let points = result.polygon.compactMap { coords -> CGPoint? in
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guard coords.count >= 2 else { return nil }
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return CGPoint(
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x: CGFloat(coords[0]) * scale + offset.x,
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y: CGFloat(coords[1]) * scale + offset.y
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)
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}
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guard points.count >= 4 else { continue }
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var path = Path()
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path.move(to: points[0])
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for pt in points.dropFirst() {
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path.addLine(to: pt)
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}
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path.closeSubpath()
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let strokeColor = Color.accentColor.opacity(0.9)
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let fillColor = Color.accentColor.opacity(0.12)
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context.stroke(path, with: .color(strokeColor), lineWidth: 2)
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context.fill(path, with: .color(fillColor))
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}
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}
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}
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.frame(width: geo.size.width, height: geo.size.height)
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}
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.aspectRatio(image.size.width / image.size.height, contentMode: .fit)
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.frame(maxHeight: 400)
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.accessibilityElement(children: .combine)
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.accessibilityLabel("Image preview with \(results.count) detected text regions")
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}
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}
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