feat(selection): show gold brick chart below volume in stock detail panel

Add an optional brick_chart series to the selection chart API, computed
from the shared gold-brick formula when strategy=gold_brick, and render
a fourth grid with red/green brick bars between the volume and J grids.

zhixing-server/src/zhixing_server/modules/selection/application/chart.py

@@ -9,7 +9,9 @@ from typing import Literal, cast
 
 import pandas as pd
 
+from ..domain.gold_brick import prepare_gold_brick_indicators
 from ..domain.indicators import compute_kdj, compute_zhixing_lines
+from ..domain.models import SelectionBar
 from ..domain.ports import MarketDataReader
 
 SELECTION_CHART_LIMIT = 250
@@ -21,7 +23,7 @@ class SelectionChartNotFound(LookupError):
 
 @dataclass(frozen=True, slots=True)
 class SelectionChartPoint:
-    """One date-aligned OHLCV, KDJ, and Zhixing-line point."""
+    """One date-aligned OHLCV, KDJ, Zhixing-line, and gold-brick point."""
 
     trade_date: date
     open: float | None
@@ -34,6 +36,7 @@ class SelectionChartPoint:
     j: float | None
     trend_white: float | None
     trend_yellow: float | None
+    brick_chart: float | None = None
 
 
 @dataclass(frozen=True, slots=True)
@@ -55,12 +58,18 @@ class GetSelectionChart:
 
         self.reader = reader
 
-    def execute(self, ts_code: str, target_trade_date: date) -> SelectionChart:
+    def execute(
+        self,
+        ts_code: str,
+        target_trade_date: date,
+        include_brick_chart: bool = False,
+    ) -> SelectionChart:
         """Return at most 250 points without changing full-history indicator state.
 
         Args:
             ts_code: Tushare stock identifier selected by the user.
             target_trade_date: Inclusive historical boundary for the chart.
+            include_brick_chart: Compute the gold-brick series for the request.
 
         Returns:
             An ascending qfq chart series aligned by trade date.
@@ -86,6 +95,7 @@ class GetSelectionChart:
         )
         kdj = compute_kdj(frame)
         white, yellow = compute_zhixing_lines(frame["close"])
+        brick_chart = self._compute_brick_chart(ts_code, bars) if include_brick_chart else None
         start = max(0, len(bars) - SELECTION_CHART_LIMIT)
         points = tuple(
             SelectionChartPoint(
@@ -100,6 +110,9 @@ class GetSelectionChart:
                 j=_finite_or_none(kdj.iloc[index]["J"]),
                 trend_white=_finite_or_none(white.iloc[index]),
                 trend_yellow=_finite_or_none(yellow.iloc[index]),
+                brick_chart=(
+                    None if brick_chart is None else _finite_or_none(brick_chart.iloc[index])
+                ),
             )
             for index, bar in enumerate(bars)
             if index >= start
@@ -112,6 +125,25 @@ class GetSelectionChart:
             points=points,
         )
 
+    def _compute_brick_chart(
+        self,
+        ts_code: str,
+        bars: tuple[SelectionBar, ...],
+    ) -> pd.Series:
+        """Run the gold-brick formula on full history for stable warmup values."""
+
+        frame = pd.DataFrame(
+            {
+                "trade_date": [bar.trade_date for bar in bars],
+                "open": [bar.open for bar in bars],
+                "high": [bar.high for bar in bars],
+                "low": [bar.low for bar in bars],
+                "close": [bar.close for bar in bars],
+                "volume": [bar.volume for bar in bars],
+            }
+        )
+        return prepare_gold_brick_indicators(frame, ts_code)["brick_chart"]
+
 
 def _finite_or_none(value: object) -> float | None:
     """Convert one Pandas scalar to a finite JSON-safe float or ``None``."""

zhixing-server/src/zhixing_server/modules/selection/presentation/http.py

@@ -153,7 +153,7 @@ class SelectionStockResponse(BaseModel):
 
 
 class SelectionChartPointResponse(BaseModel):
-    """One date-aligned qfq OHLCV, KDJ, and Zhixing-line point."""
+    """One date-aligned qfq OHLCV, KDJ, Zhixing-line, and gold-brick point."""
 
     trade_date: date
     open: float | None
@@ -166,6 +166,7 @@ class SelectionChartPointResponse(BaseModel):
     j: float | None
     trend_white: float | None
     trend_yellow: float | None
+    brick_chart: float | None = None
 
 
 class SelectionChartResponse(BaseModel):
@@ -276,11 +277,16 @@ def get_selection_chart(
     ts_code: str,
     target_trade_date: date,
     service: Annotated[GetSelectionChart, Depends(get_selection_chart_service)],
+    strategy: StrategyValue = "zhixing_b1",
 ) -> SelectionChartResponse:
     """Return one stock's bounded qfq OHLCV, KDJ, and Zhixing-line history."""
 
     try:
-        chart = service.execute(ts_code, target_trade_date)
+        chart = service.execute(
+            ts_code,
+            target_trade_date,
+            include_brick_chart=strategy == "gold_brick",
+        )
     except SelectionChartNotFound as exc:
         raise _http_error(404, "chart_data_not_found", str(exc)) from exc
     except MarketDataReaderError as exc:
@@ -503,6 +509,7 @@ def _chart_response(chart: SelectionChart) -> SelectionChartResponse:
                 j=point.j,
                 trend_white=point.trend_white,
                 trend_yellow=point.trend_yellow,
+                brick_chart=point.brick_chart,
             )
             for point in chart.points
         ],

zhixing-server/tests/test_selection_http.py

@@ -109,10 +109,15 @@ class FakeChartService:
 
     def __init__(self) -> None:
         self.mode = "ok"
-        self.request: tuple[str, date] | None = None
+        self.request: tuple[str, date, bool] | None = None
 
-    def execute(self, ts_code: str, target_trade_date: date) -> SelectionChart:
+    def execute(
-        self.request = (ts_code, target_trade_date)
+        self,
+        ts_code: str,
+        target_trade_date: date,
+        include_brick_chart: bool = False,
+    ) -> SelectionChart:
+        self.request = (ts_code, target_trade_date, include_brick_chart)
         if self.mode == "missing":
             raise SelectionChartNotFound("chart unavailable")
         if self.mode == "storage_error":
@@ -135,6 +140,7 @@ class FakeChartService:
                     j=60.0,
                     trend_white=10.2,
                     trend_yellow=10.4,
+                    brick_chart=5.0 if include_brick_chart else None,
                 ),
             ),
         )
@@ -436,7 +442,7 @@ def test_chart_returns_bounded_qfq_contract() -> None:
     )
 
     assert response.status_code == 200
-    assert chart_service.request == ("000001.SZ", TARGET)
+    assert chart_service.request == ("000001.SZ", TARGET, False)
     assert response.json() == {
         "ts_code": "000001.SZ",
         "name": "平安银行",
@@ -455,11 +461,25 @@ def test_chart_returns_bounded_qfq_contract() -> None:
                 "j": 60.0,
                 "trend_white": 10.2,
                 "trend_yellow": 10.4,
+                "brick_chart": None,
             }
         ],
     }
 
 
+def test_chart_requests_brick_series_for_gold_brick_strategy() -> None:
+    chart_service = FakeChartService()
+
+    response = _client(FakeSelectionService(), chart_service).get(
+        "/api/v1/selection/stocks/000001.SZ/chart",
+        params={"target_trade_date": "2026-08-08", "strategy": "gold_brick"},
+    )
+
+    assert response.status_code == 200
+    assert chart_service.request == ("000001.SZ", TARGET, True)
+    assert response.json()["points"][0]["brick_chart"] == 5.0
+
+
 @pytest.mark.parametrize(
     ("mode", "status_code", "error_code"),
     [

zhixing-server/tests/unit/selection/test_chart.py

@@ -9,6 +9,9 @@ from zhixing_server.modules.selection.application.chart import (
     GetSelectionChart,
     SelectionChartNotFound,
 )
+from zhixing_server.modules.selection.domain.gold_brick import (
+    prepare_gold_brick_indicators,
+)
 from zhixing_server.modules.selection.domain.indicators import (
     compute_kdj,
     compute_zhixing_lines,
@@ -100,6 +103,36 @@ def test_chart_filters_future_rows_and_preserves_nullable_points() -> None:
     assert chart.points[3].j is None
 
 
+def test_chart_skips_brick_series_by_default_and_computes_on_request() -> None:
+    history = _history(260)
+    reader = FakeReader(history)
+    target = history.bars[-1].trade_date
+
+    default_chart = GetSelectionChart(reader).execute(history.ts_code, target)
+    assert all(point.brick_chart is None for point in default_chart.points)
+
+    brick_chart = GetSelectionChart(reader).execute(
+        history.ts_code,
+        target,
+        include_brick_chart=True,
+    )
+
+    frame = pd.DataFrame(
+        {
+            "trade_date": [bar.trade_date for bar in history.bars],
+            "open": [bar.open for bar in history.bars],
+            "high": [bar.high for bar in history.bars],
+            "low": [bar.low for bar in history.bars],
+            "close": [bar.close for bar in history.bars],
+            "volume": [bar.volume for bar in history.bars],
+        }
+    )
+    expected = prepare_gold_brick_indicators(frame, history.ts_code)["brick_chart"]
+    assert brick_chart.points[-1].brick_chart == pytest.approx(float(expected.iloc[-1]))
+    assert brick_chart.points[0].trade_date == history.bars[10].trade_date
+    assert brick_chart.points[0].brick_chart == pytest.approx(float(expected.iloc[10]))
+
+
 def test_chart_rejects_empty_history() -> None:
     reader = FakeReader(StockHistory(ts_code="000001.SZ", name="平安银行"))
 

zhixing-web/src/features/selection/api/selection.api.ts

@@ -13,11 +13,13 @@ import {
 export function getSelectionChart(
   tsCode: string,
   targetTradeDate: string,
+  strategy?: SelectionStrategy,
   signal?: AbortSignal,
 ) {
   const params = new URLSearchParams({
     target_trade_date: targetTradeDate,
   })
+  if (strategy) params.set("strategy", strategy)
   return requestJson<SelectionChart>(
     `/api/v1/selection/stocks/${encodeURIComponent(tsCode)}/chart?${params.toString()}`,
     { signal },

zhixing-web/src/features/selection/api/selection.query.ts

@@ -31,8 +31,15 @@ const defaultListQuery: SelectionResultsListQuery = {
 export const selectionChartQueryKey = (
   tsCode?: string,
   targetTradeDate?: string,
+  strategy?: SelectionStrategy,
 ) =>
-  ["selection", "chart", tsCode ?? "none", targetTradeDate ?? "none"] as const
+  [
+    "selection",
+    "chart",
+    tsCode ?? "none",
+    targetTradeDate ?? "none",
+    strategy ?? "none",
+  ] as const
 
 export const selectionResultsQueryKey = (
   strategy: SelectionStrategy,
@@ -100,12 +107,16 @@ export function useSelectionResults(
   })
 }
 
-export function useSelectionChart(tsCode?: string, targetTradeDate?: string) {
+export function useSelectionChart(
+  tsCode?: string,
+  targetTradeDate?: string,
+  strategy?: SelectionStrategy,
+) {
   return useQuery({
     enabled: Boolean(tsCode && targetTradeDate),
     queryFn: ({ signal }) =>
-      getSelectionChart(tsCode ?? "", targetTradeDate ?? "", signal),
+      getSelectionChart(tsCode ?? "", targetTradeDate ?? "", strategy, signal),
-    queryKey: selectionChartQueryKey(tsCode, targetTradeDate),
+    queryKey: selectionChartQueryKey(tsCode, targetTradeDate, strategy),
   })
 }
 

zhixing-web/src/features/selection/api/selection.types.ts

@@ -75,6 +75,7 @@ export interface SelectionChartPoint {
   j: number | null
   trend_white: number | null
   trend_yellow: number | null
+  brick_chart: number | null
 }
 
 export interface SelectionChart {

zhixing-web/src/features/selection/components/selection-chart-option.test.ts

@@ -5,6 +5,7 @@ import { buildSelectionChartOption } from "./selection-chart-option"
 
 function point(index: number): SelectionChartPoint {
   return {
+    brick_chart: null,
     close: index + 10.5,
     d: index + 20,
     high: index + 11,
@@ -106,4 +107,51 @@ describe("selection chart option", () => {
       expect(indicator.data).toEqual([null])
     }
   })
+
+  it("inserts a brick grid below volume when brick values exist", () => {
+    const brickPoints = Array.from({ length: 250 }, (_, index) => ({
+      ...point(index),
+      brick_chart: index % 2,
+    }))
+    const option = buildSelectionChartOption(brickPoints)
+    const grids = option.grid as Array<Record<string, unknown>>
+    const series = option.series as Array<{
+      data: Array<{ itemStyle: { color: string }; value: number }>
+      name: string
+      xAxisIndex: number
+      yAxisIndex: number
+    }>
+    const legends = option.legend as Array<{ data: string[] }>
+    const titles = option.title as Array<{ text: string; top: unknown }>
+    const dataZoom = option.dataZoom as Array<{ xAxisIndex: number[] }>
+    const valueAxes = option.yAxis as Array<Record<string, unknown>>
+
+    expect(grids).toHaveLength(4)
+    expect(grids[1]).toMatchObject({ bottom: "37%" })
+    expect(grids[2]).toMatchObject({ bottom: "24%" })
+    expect(grids[3]).toMatchObject({ bottom: 48 })
+    expect(dataZoom[0].xAxisIndex).toEqual([0, 1, 2, 3])
+    expect(legends[1]?.data).toEqual(["金砖", "J"])
+    expect(titles.map((item) => item.text)).toEqual([
+      "日线",
+      "成交量",
+      "金砖",
+      "J",
+    ])
+    expect(valueAxes).toHaveLength(4)
+
+    const brick = series.find((item) => item.name === "金砖")
+    expect(brick).toMatchObject({ xAxisIndex: 2, yAxisIndex: 2 })
+    expect(brick?.data[1]).toMatchObject({
+      itemStyle: { color: "#dc2626" },
+      value: 1,
+    })
+    expect(brick?.data[2]).toMatchObject({
+      itemStyle: { color: "#16a34a" },
+      value: 0,
+    })
+
+    const jLine = series.find((item) => item.name === "J")
+    expect(jLine).toMatchObject({ xAxisIndex: 3, yAxisIndex: 3 })
+  })
 })

zhixing-web/src/features/selection/components/selection-chart-option.ts

@@ -16,6 +16,9 @@ import type { SelectionChartPoint } from "../api/selection.types"
 
 const DEFAULT_VISIBLE_POINTS = 120
 
+const BRICK_UP_COLOR = "#dc2626"
+const BRICK_DOWN_COLOR = "#16a34a"
+
 const zhixingLineSeries = [
   { color: "#a8a8a8", key: "trend_white", name: "知行白线" },
   { color: "#eab308", key: "trend_yellow", name: "知行黄线" },
@@ -33,9 +36,12 @@ export type SelectionChartOption = ComposeOption<
 >
 
 /**
- * Build the three-grid financial chart configuration from aligned API points.
+ * Build the financial chart configuration from aligned API points.
  *
- * @param points Ascending qfq OHLCV, J, and Zhixing-line points from the API.
+ * When any point carries gold-brick values, a brick grid is inserted below
+ * the volume grid; otherwise the original three-grid layout is kept.
+ *
+ * @param points Ascending qfq OHLCV, J, Zhixing-line, and brick points.
  * @returns One ECharts option with synchronized axes and an exact 120-point window.
  */
 export function buildSelectionChartOption(
@@ -46,6 +52,10 @@ export function buildSelectionChartOption(
   const startValue = dates[startIndex]
   const endValue = dates.at(-1)
   const zoomRange = { endValue, startValue }
+  const showBrickChart = points.some(
+    (point) => point.brick_chart !== null && point.brick_chart !== undefined,
+  )
+  const axisCount = showBrickChart ? 4 : 3
 
   return {
     animation: false,
@@ -53,17 +63,24 @@ export function buildSelectionChartOption(
       {
         ...zoomRange,
         type: "inside",
-        xAxisIndex: [0, 1, 2],
+        xAxisIndex: [...Array(axisCount).keys()],
       },
       {
         ...zoomRange,
         bottom: 4,
         height: 20,
         type: "slider",
-        xAxisIndex: [0, 1, 2],
+        xAxisIndex: [...Array(axisCount).keys()],
       },
     ],
-    grid: [
+    grid: showBrickChart
+      ? [
+          { bottom: "52%", left: 64, right: 24, top: 36 },
+          { bottom: "37%", height: "12%", left: 64, right: 24 },
+          { bottom: "24%", height: "10%", left: 64, right: 24 },
+          { bottom: 48, height: "13%", left: 64, right: 24 },
+        ]
+      : [
           { bottom: "46%", left: 64, right: 24, top: 36 },
           { bottom: "28%", height: "14%", left: 64, right: 24 },
           { bottom: 48, height: "20%", left: 64, right: 24 },
@@ -75,9 +92,9 @@ export function buildSelectionChartOption(
         top: 8,
       },
       {
-        data: ["J"],
+        data: showBrickChart ? ["金砖", "J"] : ["J"],
         right: 20,
-        top: "73%",
+        top: showBrickChart ? "77%" : "73%",
       },
     ],
     series: [
@@ -126,6 +143,7 @@ export function buildSelectionChartOption(
         xAxisIndex: 1,
         yAxisIndex: 1,
       },
+      ...(showBrickChart ? [buildBrickSeries(points)] : []),
       {
         connectNulls: false,
         data: points.map((point) => point.j),
@@ -137,11 +155,18 @@ export function buildSelectionChartOption(
         showSymbol: false,
         smooth: false,
         type: "line",
-        xAxisIndex: 2,
+        xAxisIndex: axisCount - 1,
-        yAxisIndex: 2,
+        yAxisIndex: axisCount - 1,
       },
     ],
-    title: [
+    title: showBrickChart
+      ? [
+          { left: 12, text: "日线", textStyle: { fontSize: 12 }, top: 8 },
+          { left: 72, text: "成交量", textStyle: { fontSize: 12 }, top: "50%" },
+          { left: 72, text: "金砖", textStyle: { fontSize: 12 }, top: "65%" },
+          { left: 72, text: "J", textStyle: { fontSize: 12 }, top: "77%" },
+        ]
+      : [
           { left: 12, text: "日线", textStyle: { fontSize: 12 }, top: 8 },
           { left: 72, text: "成交量", textStyle: { fontSize: 12 }, top: "54%" },
           { left: 72, text: "J", textStyle: { fontSize: 12 }, top: "72%" },
@@ -151,18 +176,44 @@ export function buildSelectionChartOption(
       trigger: "axis",
     },
     xAxis: [
-      buildCategoryAxis(dates, 0, false),
+      ...Array.from({ length: axisCount - 1 }, (_, gridIndex) =>
-      buildCategoryAxis(dates, 1, false),
+        buildCategoryAxis(dates, gridIndex, false),
-      buildCategoryAxis(dates, 2, true),
+      ),
+      buildCategoryAxis(dates, axisCount - 1, true),
     ],
     yAxis: [
       buildValueAxis(0),
       buildValueAxis(1),
-      buildValueAxis(2, { max: 120, min: -20 }),
+      ...(showBrickChart ? [buildValueAxis(2)] : []),
+      showBrickChart
+        ? buildValueAxis(3, { max: 120, min: -20 })
+        : buildValueAxis(2, { max: 120, min: -20 }),
     ],
   }
 }
 
+function buildBrickSeries(points: SelectionChartPoint[]): BarSeriesOption {
+  return {
+    data: points.map((point, index) => {
+      const previous = points[index - 1]
+      const rising =
+        previous?.brick_chart != null &&
+        point.brick_chart != null &&
+        point.brick_chart > previous.brick_chart
+      return {
+        itemStyle: {
+          color: rising ? BRICK_UP_COLOR : BRICK_DOWN_COLOR,
+        },
+        value: point.brick_chart ?? 0,
+      }
+    }),
+    name: "金砖",
+    type: "bar",
+    xAxisIndex: 2,
+    yAxisIndex: 2,
+  }
+}
+
 function toCandlestickValue(point: SelectionChartPoint) {
   if (
     point.open === null ||

zhixing-web/src/features/selection/components/selection-chart.test.tsx

@@ -38,6 +38,7 @@ const chart: SelectionChartData = {
   name: "药明康德",
   points: [
     {
+      brick_chart: null,
       close: 10.5,
       d: 48,
       high: 11,

zhixing-web/src/features/selection/components/selection-chart.tsx

@@ -64,7 +64,9 @@ export function SelectionChart({ chart, className }: SelectionChartProps) {
 
   return (
     <div
-      aria-label={`${chart.name} 日线、知行黄白线、成交量和 J 线图表`}
+      aria-label={`${chart.name} 日线、知行黄白线、成交量${
+        chart.points.some((point) => point.brick_chart != null) ? "、金砖" : ""
+      }和 J 线图表`}
       className={cn("h-full min-h-70 w-full", className)}
       ref={containerRef}
       role="img"

zhixing-web/src/features/selection/components/signal-detail-panel.tsx

@@ -23,7 +23,11 @@ interface SignalDetailPanelProps {
 }
 
 export function SignalDetailPanel({ stock }: SignalDetailPanelProps) {
-  const chartQuery = useSelectionChart(stock?.ts_code, stock?.target_trade_date)
+  const chartQuery = useSelectionChart(
+    stock?.ts_code,
+    stock?.target_trade_date,
+    stock?.strategy,
+  )
 
   if (!stock) {
     return (

zhixing-web/src/features/selection/pages/selection-results-page.test.tsx

@@ -324,6 +324,7 @@ describe("SelectionResultsPage", () => {
     expect(useSelectionChart).toHaveBeenLastCalledWith(
       "000001.SZ",
       "2026-08-08",
+      "zhixing_b1",
     )
 
     useSelectionChart.mockReturnValue({