Add Chinese side label and click-to-zoom review charts.

Crop thumbnails around entry/exit so short trades are visible; lightbox uses a tighter window.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/static/js/charts.js

@@ -1,6 +1,7 @@
-/** 复盘四周期：按「包含成交时刻」的 K 线落点，避免偏到下一根 */
+/** 复盘四周期：进出场落在包含时刻的 K 线；点击可放大 */
 (function () {
   var TF_MAX = { M1: 500, M5: 200, M15: 100, H1: 50 };
+  var TF_ZOOM = { M1: 90, M5: 48, M15: 32, H1: 20 };
   var TF_SEC = { M1: 60, M5: 300, M15: 900, H1: 3600 };
 
   function num(v) {
@@ -9,7 +10,7 @@
     return Number.isFinite(n) ? n : null;
   }
 
-  /** 找到覆盖 ts 的那根 K 线：barOpen <= ts < barOpen+period（最后一根含右边界） */
+  /** 找到覆盖 ts 的那根 K 线：barOpen <= ts < barOpen+period */
   function barIndexAt(bars, ts, tf) {
     if (ts == null || !bars.length) return -1;
     var period = TF_SEC[tf] || 60;
@@ -23,15 +24,19 @@
         return i;
       }
     }
-    // 落在首根之前 / 末根之后：夹到边界
     if (t < Number(bars[0].ts)) return 0;
     return bars.length - 1;
   }
 
-  function cropBars(bars, markers, tf) {
+  /** 始终以成交为中心裁剪到 maxN，避免短单淹没在全天 K 线里 */
+  function cropBars(bars, markers, tf, maxN) {
     if (!bars.length) return bars;
-    var maxN = TF_MAX[tf] || 100;
-    if (bars.length <= maxN) return bars;
+    maxN = maxN || TF_MAX[tf] || 100;
+    markers = markers || {};
+
+    if (markers.openTs == null) {
+      return bars.length > maxN ? bars.slice(-maxN) : bars;
+    }
 
     var a = barIndexAt(bars, markers.openTs, tf);
     var b =
@@ -51,7 +56,6 @@
   function fmtBjt(ts) {
     if (ts == null) return "";
     var d = new Date(Number(ts) * 1000);
-    // 用 UTC+8 显示，与复盘页北京时间一致
     var utc = d.getTime() + d.getTimezoneOffset() * 60000;
     var bjt = new Date(utc + 8 * 3600000);
     var hh = String(bjt.getHours()).padStart(2, "0");
@@ -59,14 +63,23 @@
     return hh + ":" + mm;
   }
 
-  function drawCandleChart(canvas, bars, markers, tf) {
+  function sideLabel(side) {
+    var s = (side || "").toLowerCase();
+    if (s === "buy") return "买入（多）";
+    if (s === "sell") return "卖出（空）";
+    return side || "";
+  }
+
+  function drawCandleChart(canvas, bars, markers, tf, opts) {
     if (!canvas || !bars || !bars.length) return;
-    bars = cropBars(bars, markers || {}, tf);
+    opts = opts || {};
+    var maxN = opts.maxN || TF_MAX[tf] || 100;
+    bars = cropBars(bars, markers || {}, tf, maxN);
     markers = markers || {};
 
     var dpr = window.devicePixelRatio || 1;
-    var cssW = canvas.clientWidth || 400;
-    var cssH = canvas.clientHeight || 220;
+    var cssW = canvas.clientWidth || opts.width || 400;
+    var cssH = canvas.clientHeight || opts.height || 220;
     canvas.width = cssW * dpr;
     canvas.height = cssH * dpr;
     var ctx = canvas.getContext("2d");
@@ -75,7 +88,7 @@
     var padL = 4;
     var padR = 4;
     var padT = 4;
-    var padB = 16; // 底部时间轴
+    var padB = 16;
 
     var min = Infinity;
     var max = -Infinity;
@@ -112,7 +125,7 @@
       return padL + i * slot + slot * 0.5;
     };
 
-    var bodyW = Math.max(1, Math.min(6, slot * 0.6));
+    var bodyW = Math.max(1, Math.min(opts.zoom ? 10 : 6, slot * 0.6));
     bars.forEach(function (b, i) {
       var x = xOf(i);
       var up = b.close >= b.open;
@@ -130,7 +143,6 @@
       ctx.fillRect(x - bodyW / 2, top, bodyW, bh);
     });
 
-    // 底部左右时间（北京时间），方便对照成交时刻
     ctx.fillStyle = "#888899";
     ctx.font = "10px Microsoft YaHei UI, sans-serif";
     ctx.textBaseline = "top";
@@ -154,7 +166,7 @@
       var x = xOf(i);
       var y = yOf(price);
       ctx.beginPath();
-      ctx.arc(x, y, 4.5, 0, Math.PI * 2);
+      ctx.arc(x, y, opts.zoom ? 6 : 4.5, 0, Math.PI * 2);
       ctx.fillStyle = color;
       ctx.fill();
       ctx.lineWidth = 1.5;
@@ -176,7 +188,7 @@
           y = pe.y - 8;
         }
         ctx.beginPath();
-        ctx.arc(x, y, 4.5, 0, Math.PI * 2);
+        ctx.arc(x, y, opts.zoom ? 6 : 4.5, 0, Math.PI * 2);
         ctx.fillStyle = exitColor;
         ctx.fill();
         ctx.lineWidth = 1.5;
@@ -202,15 +214,18 @@
       ctx.fillText("出", px.x, px.y - 6);
     }
 
-    var meta = canvas.parentElement && canvas.parentElement.querySelector(".chart-meta");
+    var meta =
+      canvas.parentElement && canvas.parentElement.querySelector(".chart-meta");
     if (meta) {
+      var sideBit = markers.side ? " · " + sideLabel(markers.side) : "";
       meta.textContent =
         bars.length +
         " 根 · " +
         fmtBjt(bars[0].ts) +
         "–" +
         fmtBjt(bars[n - 1].ts) +
-        " 北京时间";
+        " 北京时间" +
+        sideBit;
     }
   }
 
@@ -224,18 +239,119 @@
     };
   }
 
+  function paintCanvas(el, opts) {
+    var bars = JSON.parse(el.dataset.bars || "[]");
+    var tf = el.dataset.tf || "M1";
+    drawCandleChart(el, bars, readMarkers(el), tf, opts);
+  }
+
   function paintAll() {
     document.querySelectorAll("canvas.chart-canvas").forEach(function (el) {
       try {
-        var bars = JSON.parse(el.dataset.bars || "[]");
-        var tf = el.dataset.tf || "M1";
-        drawCandleChart(el, bars, readMarkers(el), tf);
+        paintCanvas(el, {});
       } catch (e) {
         console.warn(e);
       }
     });
   }
 
+  function ensureLightbox() {
+    var box = document.getElementById("chart-lightbox");
+    if (box) return box;
+    box = document.createElement("div");
+    box.id = "chart-lightbox";
+    box.className = "chart-lightbox";
+    box.hidden = true;
+    box.innerHTML =
+      '<div class="chart-lightbox-panel">' +
+      '<div class="chart-lightbox-head">' +
+      '<span class="chart-lightbox-title"></span>' +
+      '<button type="button" class="chart-lightbox-close" aria-label="关闭">×</button>' +
+      "</div>" +
+      '<p class="muted chart-lightbox-hint">围绕进出场收紧显示 · Esc / 点击遮罩关闭</p>' +
+      '<canvas class="chart-lightbox-canvas"></canvas>' +
+      "</div>";
+    document.body.appendChild(box);
+
+    box.addEventListener("click", function (e) {
+      if (e.target === box) closeLightbox();
+    });
+    box
+      .querySelector(".chart-lightbox-close")
+      .addEventListener("click", closeLightbox);
+    document.addEventListener("keydown", function (e) {
+      if (e.key === "Escape" && !box.hidden) closeLightbox();
+    });
+    return box;
+  }
+
+  function closeLightbox() {
+    var box = document.getElementById("chart-lightbox");
+    if (box) box.hidden = true;
+  }
+
+  function openLightbox(srcCanvas) {
+    var box = ensureLightbox();
+    var tf = srcCanvas.dataset.tf || "M1";
+    var markers = readMarkers(srcCanvas);
+    var title = box.querySelector(".chart-lightbox-title");
+    title.textContent =
+      tf +
+      " · " +
+      (markers.side ? sideLabel(markers.side) + " · " : "") +
+      "点击放大";
+
+    var canvas = box.querySelector(".chart-lightbox-canvas");
+    canvas.dataset.tf = tf;
+    canvas.dataset.bars = srcCanvas.dataset.bars;
+    canvas.dataset.openTs = srcCanvas.dataset.openTs || "";
+    canvas.dataset.closeTs = srcCanvas.dataset.closeTs || "";
+    canvas.dataset.openPrice = srcCanvas.dataset.openPrice || "";
+    canvas.dataset.closePrice = srcCanvas.dataset.closePrice || "";
+    canvas.dataset.side = srcCanvas.dataset.side || "";
+
+    box.hidden = false;
+    // 等面板可见后再量宽高
+    requestAnimationFrame(function () {
+      try {
+        drawCandleChart(
+          canvas,
+          JSON.parse(canvas.dataset.bars || "[]"),
+          markers,
+          tf,
+          { zoom: true, maxN: TF_ZOOM[tf] || 60 }
+        );
+      } catch (e) {
+        console.warn(e);
+      }
+    });
+  }
+
+  document.addEventListener("click", function (e) {
+    var canvas = e.target.closest && e.target.closest("canvas.chart-canvas");
+    if (!canvas) return;
+    openLightbox(canvas);
+  });
+
   paintAll();
-  window.addEventListener("resize", paintAll);
+  window.addEventListener("resize", function () {
+    paintAll();
+    var box = document.getElementById("chart-lightbox");
+    if (box && !box.hidden) {
+      var canvas = box.querySelector(".chart-lightbox-canvas");
+      if (canvas && canvas.dataset.bars) {
+        try {
+          drawCandleChart(
+            canvas,
+            JSON.parse(canvas.dataset.bars || "[]"),
+            readMarkers(canvas),
+            canvas.dataset.tf || "M1",
+            { zoom: true, maxN: TF_ZOOM[canvas.dataset.tf] || 60 }
+          );
+        } catch (err) {
+          /* ignore */
+        }
+      }
+    }
+  });
 })();