src/app/SliceExport.cpp

@@ -2,12 +2,15 @@
 
 #include <fstream>
 
+#include <vtkCamera.h>
 #include <vtkDataArray.h>
 #include <vtkImageData.h>
 #include <vtkNew.h>
 #include <vtkPNGWriter.h>
 #include <vtkPointData.h>
 #include <vtkRenderWindow.h>
+#include <vtkRenderer.h>
+#include <vtkRendererCollection.h>
 #include <vtkWindowToImageFilter.h>
 
 namespace geopro::app {
@@ -41,6 +44,68 @@ bool captureRenderWindowPng(vtkRenderWindow* win, const std::string& path, int&
     return writer->GetErrorCode() == 0;
 }
 
+bool captureFramedRegionPng(vtkRenderWindow* win, const double regionBounds[6], double padFactor,
+                            double minExtent, const std::string& path, int& outW, int& outH) {
+    outW = outH = 0;
+    if (win == nullptr || path.empty()) return false;
+    vtkRenderer* ren =
+        win->GetRenderers() ? win->GetRenderers()->GetFirstRenderer() : nullptr;
+    vtkCamera* cam = ren ? ren->GetActiveCamera() : nullptr;
+    if (ren == nullptr || cam == nullptr)
+        return captureRenderWindowPng(win, path, outW, outH);  // 无渲染器 → 退回整窗
+
+    // 1) 区域包围盒：minExtent 兜底(点零体积/共面零厚度) → padFactor 以中心外扩留边距。
+    double b[6];
+    for (int i = 0; i < 3; ++i) {
+        const double lo = regionBounds[2 * i], hi = regionBounds[2 * i + 1];
+        const double c = 0.5 * (lo + hi);
+        double half = 0.5 * (hi - lo);
+        if (2.0 * half < minExtent) half = 0.5 * minExtent;  // 退化轴兜底
+        half *= padFactor;                                   // 外扩边距
+        b[2 * i] = c - half;
+        b[2 * i + 1] = c + half;
+    }
+
+    // 2) 存相机现场（ResetCamera 改 position/focalPoint/clipping/parallelScale）。
+    double pos[3], fp[3], up[3], clip[2];
+    cam->GetPosition(pos);
+    cam->GetFocalPoint(fp);
+    cam->GetViewUp(up);
+    cam->GetClippingRange(clip);
+    const double va = cam->GetViewAngle();
+    const double ps = cam->GetParallelScale();
+
+    // 3) 重构图：保持视角方向，仅推近/缩放框住外扩区域。
+    ren->ResetCamera(b);
+
+    // 4) 截图（后台缓冲 + 关交换 → 屏幕不闪）。
+    vtkNew<vtkWindowToImageFilter> w2i;
+    w2i->SetInput(win);
+    w2i->ReadFrontBufferOff();
+    w2i->Update();
+    if (auto* img = w2i->GetOutput()) {
+        int dims[3];
+        img->GetDimensions(dims);
+        outW = dims[0];
+        outH = dims[1];
+    }
+    vtkNew<vtkPNGWriter> writer;
+    writer->SetFileName(path.c_str());
+    writer->SetInputConnection(w2i->GetOutputPort());
+    writer->Write();
+    const bool ok = writer->GetErrorCode() == 0;
+
+    // 5) 还原相机 + 重绘回原视图。
+    cam->SetPosition(pos);
+    cam->SetFocalPoint(fp);
+    cam->SetViewUp(up);
+    cam->SetViewAngle(va);
+    cam->SetParallelScale(ps);
+    cam->SetClippingRange(clip);
+    win->Render();
+    return ok;
+}
+
 bool exportSliceDat(vtkImageData* slice, const std::string& path) {
     if (slice == nullptr || path.empty()) return false;
     vtkDataArray* arr = slice->GetPointData() ? slice->GetPointData()->GetScalars() : nullptr;

src/app/SliceExport.hpp

@@ -12,6 +12,15 @@ bool exportSliceImagePng(vtkImageData* colorImage, const std::string& path);
 // 截整个渲染窗口为 PNG（异常标识截图，需求 R88）；成功返回 true，并填回截图像素宽高。
 bool captureRenderWindowPng(vtkRenderWindow* win, const std::string& path, int& outW, int& outH);
 
+// 「相机重构图」截图（方案A）：把相机临时重新取景到 regionBounds（圈定范围）外扩后的区域，
+//   使异常框在画面中央带周边语境，再截图、还原相机。业界 frame/zoom-to-fit selection 范式。
+//   regionBounds: {xmin,xmax,ymin,ymax,zmin,zmax} 世界系圈定包围盒；
+//   padFactor: 以盒中心外扩的倍数（1.4≈异常占画面~70%）；
+//   minExtent: 退化兜底（点=零体积、线/面共面=某轴零厚度）时各轴的最小世界尺寸。
+//   视角方向不变（仅推近/缩放）；屏幕无闪（后台缓冲+关交换）。失败回退整窗截图。
+bool captureFramedRegionPng(vtkRenderWindow* win, const double regionBounds[6], double padFactor,
+                            double minExtent, const std::string& path, int& outW, int& outH);
+
 // 把切片重采样 2D 标量影像写为 .dat 文本网格（行=j、列=i，空格分隔，每格取标量首分量）；成功返回 true。
 bool exportSliceDat(vtkImageData* slice, const std::string& path);
 

src/app/main.cpp

@@ -538,7 +538,7 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                 anomalyDrawTool->start(
                     o, normal,
                     [&window, sceneView, scene3dRepo, renderWindowPtr, refreshAnomalies, refreshAnalysis,
-                     volId, savedSliceId, normal, o](const std::vector<ri::Vec3>& worldPts) {
+                     volId, savedSliceId, normal, o, p1, p2](const std::vector<ri::Vec3>& worldPts) {
                         // 草稿异常：先临时渲染（让用户在对话框前看到所画，且截图含异常）。
                         geopro::core::Anomaly a;
                         a.markType = geopro::core::AnomalyMarkType::Polygon;
@@ -558,7 +558,23 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                         const QString shot =
                             QDir(QDir::tempPath()).filePath(QStringLiteral("geopro_anomaly_shot.png"));
                         int sw = 0, sh = 0;
-                        geopro::app::captureRenderWindowPng(renderWindowPtr, shot.toStdString(), sw, sh);
+                        // 相机重构图(方案A)：框住圈定 worldPts 外扩区域(异常居中带语境)；
+                        //   点/共面退化用切片尺寸兜底框景半径。
+                        double rb[6] = {worldPts[0][0], worldPts[0][0], worldPts[0][1],
+                                        worldPts[0][1], worldPts[0][2], worldPts[0][2]};
+                        for (const auto& p : worldPts) {
+                            rb[0] = std::min(rb[0], p[0]); rb[1] = std::max(rb[1], p[0]);
+                            rb[2] = std::min(rb[2], p[1]); rb[3] = std::max(rb[3], p[1]);
+                            rb[4] = std::min(rb[4], p[2]); rb[5] = std::max(rb[5], p[2]);
+                        }
+                        auto vlen = [](double x, double y, double z) {
+                            return std::sqrt(x * x + y * y + z * z);
+                        };
+                        const double e1 = vlen(p1[0] - o[0], p1[1] - o[1], p1[2] - o[2]);
+                        const double e2 = vlen(p2[0] - o[0], p2[1] - o[1], p2[2] - o[2]);
+                        const double minExt = 0.25 * std::min(e1, e2);  // 点/线退化框景半径
+                        geopro::app::captureFramedRegionPng(renderWindowPtr, rb, 1.4, minExt,
+                                                            shot.toStdString(), sw, sh);
                         geopro::app::AnomalySaveDialog dlg(shot, sw, sh, &window);
                         if (dlg.exec() != QDialog::Accepted) {
                             sceneView->removeAnomaly(draftId);