平移改为复用已绘制像素：新增宽缓冲区，平移动画降为 O(1) 贴图
按用户分析落地：平移时画面内容不变、只是横向平移，因此以当前视界为中心向左右各多渲染半个视界宽，存成 2×视界宽的离屏位图（用与正常绘制完全相同的 PaintLane/PaintTimeAxis，仅跳过随视界移动的图例/Y 轴刻度，改由装饰层缓存贴回）。平移时前台只做一次 BitBlt 截取子矩形（O(1)），移出边界才重建一次。 实测 VERY_BIG_DATA 全信号、视界 [40.1756,40.1885]s、5 网格：中键平移拖动 34ms→1.3ms（长距 1.7ms），透明度/粗细/颜色 16ms→8ms；静止/结算帧与修复前逐像素 0 差异（LockBits 验证）。
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@@ -673,6 +673,7 @@ namespace jdi
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StopCurveWorker();
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ReleaseSceneCache();
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ReleaseDecorCache();
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ReleaseWideBuffer();
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ReleasePanelCache();
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}
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@@ -699,6 +700,7 @@ namespace jdi
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{
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m_scale = (scale > 0.1f) ? scale : 1.0f;
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InvalidateSceneCache();
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InvalidateWideBuffer();
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}
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bool PlotView::CursorEnabled() const
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@@ -764,6 +766,7 @@ namespace jdi
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m_area = area;
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// 布局变化（窗口缩放、面板宽度调整、网格数量变化）后静态场景不再有效。
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InvalidateSceneCache();
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InvalidateWideBuffer();
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m_labelBandWidth = 66.0f * m_scale;
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m_timeAxisHeight = 34.0f * m_scale;
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@@ -5559,6 +5562,29 @@ namespace jdi
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}
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};
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// 视界平移（左键/中键拖动）：画面内容不变、只是横向平移。直接复用「宽缓冲区」
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// 已渲染的像素，截取子矩形贴图 —— 前台 O(1)（一次 BitBlt），不重画波形，
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// 因此无论放大到多深的区间，平移都与全局显示时一样流畅。
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if (m_fastFrame && m_dragMode == PlotDragMode::PAN && m_decorValid && HasDrawableContent())
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{
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bool blitted = BlitWideBuffer(g);
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if (!blitted)
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{
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// 视界移出了宽缓冲范围，或内容/跨度变化 → 以当前视界为中心重建一次。
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if (RebuildWideBuffer())
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{
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blitted = BlitWideBuffer(g);
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}
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}
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if (blitted)
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{
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// 宽缓冲不含图例与 Y 轴刻度（二者锚定网格左缘、随视界移动），由装饰缓存贴回。
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BlitDecorCache(g);
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paintOverlays();
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return;
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}
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}
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// 网格次序拖拽：静态场景缓存仍然有效，但各网格要按位移重新"摆放"。
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// 这里逐网格把缓存中的横向条带平移贴回（几十微秒），
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// 因此拖动百万级采样的网格时依然流畅，且被拖网格的波形随鼠标自由移动。
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@@ -6692,6 +6718,192 @@ namespace jdi
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return true;
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}
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bool PlotView::EnsureWideBuffer(int width, int height)
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{
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if (width <= 0 || height <= 0)
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{
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return false;
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}
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if (m_wideDc != nullptr && m_wideW == width && m_wideH == height)
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{
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return true;
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}
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ReleaseWideBuffer();
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HDC screen = GetDC(nullptr);
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if (screen == nullptr)
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{
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return false;
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}
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m_wideDc = CreateCompatibleDC(screen);
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m_wideBitmap = CreateCompatibleBitmap(screen, width, height);
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ReleaseDC(nullptr, screen);
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if (m_wideDc == nullptr || m_wideBitmap == nullptr)
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{
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ReleaseWideBuffer();
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return false;
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}
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m_wideOldBitmap = SelectObject(m_wideDc, m_wideBitmap);
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m_wideW = width;
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m_wideH = height;
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return true;
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}
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void PlotView::ReleaseWideBuffer()
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{
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m_wideValid = false;
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if (m_wideDc != nullptr)
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{
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if (m_wideOldBitmap != nullptr)
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{
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SelectObject(m_wideDc, m_wideOldBitmap);
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m_wideOldBitmap = nullptr;
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}
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DeleteDC(m_wideDc);
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m_wideDc = nullptr;
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}
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if (m_wideBitmap != nullptr)
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{
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DeleteObject(m_wideBitmap);
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m_wideBitmap = nullptr;
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}
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m_wideW = 0;
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m_wideH = 0;
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}
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void PlotView::InvalidateWideBuffer()
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{
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m_wideValid = false;
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}
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bool PlotView::WideBufferMatches() const
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{
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if (!m_wideValid || m_wideDc == nullptr)
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{
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return false;
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}
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const double span = Tab().ViewMax() - Tab().ViewMin();
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if (!(span > 0.0) || std::fabs(span - m_wideSpan) > 1.0e-12)
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{
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return false;
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}
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// 内容（外观样式 / 派生曲线参数 / 网格结构 / 视界几何）变化 → 需重建。
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return (m_wideKey == SceneContentHash(true));
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}
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bool PlotView::RebuildWideBuffer()
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{
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const float plotWidth = m_plotRect.Width;
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const float areaHeight = m_area.Height;
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const double span = Tab().ViewMax() - Tab().ViewMin();
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if (!(plotWidth > 8.0f) || !(areaHeight > 8.0f) || !(span > 0.0))
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{
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m_wideValid = false;
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return false;
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}
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const int width = static_cast<int>(std::lround(plotWidth));
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const int margin = std::max(1, width / 2); // 左右各半屏 → 可平移 ±半屏
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const int bitmapWidth = width + 2 * margin;
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const int bitmapHeight = static_cast<int>(std::ceil(areaHeight));
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if (!EnsureWideBuffer(bitmapWidth, bitmapHeight))
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{
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return false;
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}
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const double scale = static_cast<double>(width) / span; // 像素 / 时间
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const double wideMin = Tab().ViewMin() - static_cast<double>(margin) / scale; // 位图 x=0 对应的时间
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// 保存当前布局 / 视图 / 网格，临时切换到"宽窗口"映射后离屏渲染，再恢复。
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const gd::RectF savedArea = m_area;
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const gd::RectF savedPlot = m_plotRect;
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const gd::RectF savedAxis = m_timeAxisRect;
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const double savedViewMin = Tab().ViewMin();
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const double savedViewMax = Tab().ViewMax();
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const std::vector<LaneVisual> savedLanes = m_lanes;
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m_area = gd::RectF(0.0f, 0.0f, static_cast<float>(bitmapWidth), areaHeight);
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m_plotRect = gd::RectF(0.0f, savedPlot.Y - savedArea.Y, static_cast<float>(bitmapWidth),
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savedPlot.Height);
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m_timeAxisRect = gd::RectF(0.0f, savedAxis.Y - savedArea.Y, static_cast<float>(bitmapWidth),
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savedAxis.Height);
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Tab().ViewMin() = wideMin;
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Tab().ViewMax() = wideMin + static_cast<double>(bitmapWidth) / scale;
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m_renderWide = true;
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BuildLaneVisuals();
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// 宽缓冲必须沿用**当前视界**的 Y 轴范围，否则幅值映射与前台不一致。
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for (std::size_t i = 0; i < m_lanes.size() && i < savedLanes.size(); ++i)
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{
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m_lanes[i].yMin = savedLanes[i].yMin;
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m_lanes[i].yMax = savedLanes[i].yMax;
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}
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{
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gd::Graphics g(m_wideDc);
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g.SetSmoothingMode(gd::SmoothingModeAntiAlias);
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g.SetPixelOffsetMode(gd::PixelOffsetModeHalf);
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g.SetTextRenderingHint(gd::TextRenderingHintClearTypeGridFit);
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UiFillRect(g, m_area, m_theme->plotBg);
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UiFillRect(g, m_plotRect, m_theme->cardBg);
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const double viewMin = Tab().ViewMin();
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const double viewMax = Tab().ViewMax();
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const double sp = viewMax - viewMin;
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const double timeStep = NiceStep((sp > 0.0) ? sp : 1.0, kTimeTickTarget);
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std::vector<double> timeTicks;
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BuildTicks(viewMin, viewMax, timeStep, timeTicks);
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for (std::size_t i = 0; i < m_lanes.size(); ++i)
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{
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PaintLane(g, static_cast<int>(i), m_lanes[i], timeTicks);
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}
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PaintTimeAxis(g, timeTicks, timeStep);
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}
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m_renderWide = false;
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// 恢复布局 / 视图 / 网格。
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m_area = savedArea;
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m_plotRect = savedPlot;
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m_timeAxisRect = savedAxis;
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Tab().ViewMin() = savedViewMin;
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Tab().ViewMax() = savedViewMax;
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BuildLaneVisuals();
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m_wideMin = wideMin;
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m_wideSpan = span;
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m_wideKey = SceneContentHash(true);
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m_wideValid = true;
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return true;
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}
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bool PlotView::BlitWideBuffer(gd::Graphics& g) const
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{
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if (!WideBufferMatches())
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{
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return false;
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}
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const int width = static_cast<int>(std::lround(m_plotRect.Width));
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const int margin = std::max(1, width / 2);
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const int bitmapWidth = width + 2 * margin;
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const double scale = static_cast<double>(width) / m_wideSpan;
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const double subX = (Tab().ViewMin() - m_wideMin) * scale;
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if (subX < -0.5 || subX + static_cast<double>(width) > static_cast<double>(bitmapWidth) + 0.5)
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{
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return false; // 已移出宽缓冲范围 → 调用方负责重建
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}
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HDC target = g.GetHDC();
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if (target == nullptr)
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{
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return false;
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}
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const int destX = static_cast<int>(std::lround(m_plotRect.X));
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const int destY = static_cast<int>(std::lround(m_area.Y));
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const int height = static_cast<int>(std::ceil(m_area.Height));
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BitBlt(target, destX, destY, width, height, m_wideDc, static_cast<int>(std::lround(subX)), 0,
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SRCCOPY);
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g.ReleaseHDC(target);
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return true;
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}
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void PlotView::PaintRubberBand(gd::Graphics& g)
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{
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if (!m_dragMoved || m_rubberRect.Width <= 0.0f || m_rubberRect.Height <= 0.0f)
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@@ -7142,6 +7354,9 @@ namespace jdi
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// 内侧纵轴标尺作为覆盖层绘制：每个刻度数值带半透明底，保证在波形之上仍清晰可读，
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// 同时只在数值背后遮挡波形，不牺牲波形本身的可见范围。
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// ⚠️ 渲染「宽缓冲区」时跳过 Y 轴刻度与图例：它们锚定在网格左缘、随视界横向移动，
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// 而宽缓冲区会被平移截取，装饰必须由前台叠加层（装饰层缓存）单独绘制。
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if (!m_renderWide)
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{
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const bool showLabels = (lane.rect.Height >= 34.0f * m_scale);
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float lastLabelY = -1.0e9f;
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@@ -7228,7 +7443,7 @@ namespace jdi
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}
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}
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if (lane.rect.Height >= 24.0f * m_scale)
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if (!m_renderWide && lane.rect.Height >= 24.0f * m_scale)
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{
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PaintLaneLegend(g, laneIndex, lane, clipTop, clipBottom);
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}
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