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feat/dataset-detail-chart #5

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gaozheng merged 74 commits from feat/dataset-detail-chart into main 2026-06-13 17:30:37 +08:00
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1 changed files with 6 additions and 8 deletions
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14
src/app/panels/chart/ContourPlotItem.cpp
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@ -19,7 +19,6 @@ constexpr int kFillUpsample = 4; // 填充图像每网格格细分 K（
constexpr int kMaxFillDim = 2400; // 填充图像单边像素上限（防极端网格爆内存） constexpr int kMaxFillDim = 2400; // 填充图像单边像素上限（防极端网格爆内存）
constexpr int kLabelFontPx = 10; // 等值线标注字号 constexpr int kLabelFontPx = 10; // 等值线标注字号
constexpr double kLabelMinLenPx = 24.0; // 整条线像素长度小于此不标注（极短碎线） constexpr double kLabelMinLenPx = 24.0; // 整条线像素长度小于此不标注（极短碎线）
constexpr double kLabelSpacingPx = 220.0; // 沿线每隔此像素重复一个标注（对齐原版密度）
constexpr double kRad2Deg = 57.29577951308232; // 180/π（避免依赖 M_PI） constexpr double kRad2Deg = 57.29577951308232; // 180/π（避免依赖 M_PI）
} // namespace } // namespace
@ -195,7 +194,7 @@ void ContourPlotItem::draw(QPainter* painter, const QwtScaleMap& xMap, const Qwt
} }
painter->restore(); painter->restore();
// 3) 标注：沿线中段画 level 数值（小字黑，随相邻两点方向旋转）。 // 3) 标注：每条等值线只标一个（对齐原版），放弧长中点，随该处方向旋转。
if (showLabels_) { if (showLabels_) {
painter->save(); painter->save();
painter->setRenderHint(QPainter::Antialiasing, true); painter->setRenderHint(QPainter::Antialiasing, true);
@ -216,14 +215,13 @@ void ContourPlotItem::draw(QPainter* painter, const QwtScaleMap& xMap, const Qwt
if (total < kLabelMinLenPx) continue; // 极短碎线不标注 if (total < kLabelMinLenPx) continue; // 极短碎线不标注
const QString txt = QString::number(ln.level, 'g', 4); const QString txt = QString::number(ln.level, 'g', 4);
const double halfW = fm.horizontalAdvance(txt) * 0.5; const double halfW = fm.horizontalAdvance(txt) * 0.5;
// 沿线每隔 kLabelSpacingPx 放一个标注；首个在半间距处（短线即中点附近）。 const double targetAt = total * 0.5; // 弧长中点
double nextAt = std::min(kLabelSpacingPx * 0.5, total * 0.5);
double acc = 0.0; double acc = 0.0;
for (std::size_t i = 1; i < px.size() && nextAt <= total; ++i) { for (std::size_t i = 1; i < px.size(); ++i) {
const double seg = const double seg =
std::hypot(px[i].x() - px[i - 1].x(), px[i].y() - px[i - 1].y()); std::hypot(px[i].x() - px[i - 1].x(), px[i].y() - px[i - 1].y());
while (nextAt <= acc + seg && nextAt <= total) { if (acc + seg >= targetAt || i == px.size() - 1) {
const double t = seg > 1e-6 ? (nextAt - acc) / seg : 0.0; const double t = seg > 1e-6 ? (targetAt - acc) / seg : 0.0;
const QPointF pos(px[i - 1].x() + (px[i].x() - px[i - 1].x()) * t, const QPointF pos(px[i - 1].x() + (px[i].x() - px[i - 1].x()) * t,
px[i - 1].y() + (px[i].y() - px[i - 1].y()) * t); px[i - 1].y() + (px[i].y() - px[i - 1].y()) * t);
double ang = double ang =
@ -236,7 +234,7 @@ void ContourPlotItem::draw(QPainter* painter, const QwtScaleMap& xMap, const Qwt
painter->rotate(ang); painter->rotate(ang);
painter->drawText(QPointF(-halfW, -2), txt); painter->drawText(QPointF(-halfW, -2), txt);
painter->restore(); painter->restore();
nextAt += kLabelSpacingPx; break; // 只标一个
} }
acc += seg; acc += seg;
} }