PSC daily candle history and pixel candlestick chart

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Decentralized/CandleChart.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Decentralized.Domain;
+using UnityEngine;
+
+namespace Decentralized
+{
+    /// <summary>
+    /// 日 K 图：运行时画到一张小 Texture2D 上（一根蜡烛 5 像素宽、间隔 1），点采样放大 2 倍显示，和游戏的像素风格一致。
+    /// 上面是价格（涨绿跌红、影线、7 日均线、可选阈值虚线），下面是成交量（玩家青色叠在大户灰色上）。纹理按用途缓存复用。
+    /// </summary>
+    public static class CandleChart
+    {
+        public const int Days = 30, Step = 6, Body = 5, PriceH = 70, Gap = 3, VolH = 16, Pad = 2;
+        public const int W = Days * Step + Pad * 2, H = PriceH + Gap + VolH + Pad * 2;
+        public const float Scale = 2f;
+
+        private static readonly Color32 Bg = new Color32(30, 31, 34, 255), Grid = new Color32(48, 50, 54, 255);
+        private static readonly Color32 Up = new Color32(108, 190, 112, 255), Down = new Color32(214, 94, 88, 255);
+        private static readonly Color32 Ma = new Color32(226, 196, 92, 255), Thr = new Color32(150, 170, 230, 255);
+        private static readonly Color32 VolNpc = new Color32(92, 96, 104, 255), VolMe = new Color32(96, 200, 210, 255);
+
+        private sealed class Slot { public Texture2D Tex; public Sprite Sprite; public Color32[] Px; }
+        private static readonly Dictionary<string, Slot> Slots = new Dictionary<string, Slot>();
+
+        /// <summary>画一张图，返回可以交给 AddImage 的 Sprite。threshold &gt; 0 时画一条水平虚线（预测盘的阈值）。</summary>
+        public static Sprite Render(string key, IList<Candle> all, double threshold = 0)
+        {
+            if (!Slots.TryGetValue(key, out var s) || s.Tex == null)
+            {
+                var tex = new Texture2D(W, H, TextureFormat.RGBA32, false) { filterMode = FilterMode.Point, wrapMode = TextureWrapMode.Clamp };
+                s = Slots[key] = new Slot { Tex = tex, Px = new Color32[W * H], Sprite = Sprite.Create(tex, new Rect(0, 0, W, H), new Vector2(0.5f, 0.5f), 100f) };
+            }
+            var px = s.Px;
+            for (int i = 0; i < px.Length; i++) px[i] = Bg;
+            var c = all.Skip(Math.Max(0, all.Count - Days)).ToList();
+            int volY0 = Pad, priceY0 = Pad + VolH + Gap;
+            // 网格：价格区四等分
+            for (int g = 1; g < 4; g++) HLine(px, Pad, W - Pad - 1, priceY0 + PriceH * g / 4, Grid);
+            if (c.Count > 0)
+            {
+                var ma = CandleBook.Ma(all, 7).Skip(Math.Max(0, all.Count - Days)).ToList();
+                double lo = Math.Min(c.Min(x => x.L), ma.Min()), hi = Math.Max(c.Max(x => x.H), ma.Max());
+                if (threshold > 0) { lo = Math.Min(lo, threshold); hi = Math.Max(hi, threshold); }
+                double span = Math.Max(hi - lo, hi * 0.02);
+                lo -= span * 0.05; hi += span * 0.05; span = hi - lo;
+                Func<double, int> y = p => priceY0 + (int)Math.Round((p - lo) / span * (PriceH - 1));
+                double vmax = Math.Max(1, c.Max(x => x.VolPlayer + x.VolNpc));
+                int x0 = Pad + (Days - c.Count) * Step;   // 不足 30 根时靠右
+                for (int i = 0; i < c.Count; i++)
+                {
+                    var k = c[i];
+                    int left = x0 + i * Step, mid = left + Body / 2;
+                    var col = k.C >= k.O ? Up : Down;
+                    VLine(px, mid, y(k.L), y(k.H), col);
+                    int b0 = y(Math.Min(k.O, k.C)), b1 = Math.Max(b0, y(Math.Max(k.O, k.C)));
+                    for (int xx = left; xx < left + Body; xx++)
+                    {
+                        // 当天还没收盘的蜡烛画成空心
+                        if (!k.Closed && xx > left && xx < left + Body - 1 && b1 - b0 > 1) { Set(px, xx, b0, col); Set(px, xx, b1, col); continue; }
+                        VLine(px, xx, b0, b1, col);
+                    }
+                    int hn = (int)Math.Round(k.VolNpc / vmax * VolH), hm = (int)Math.Round(k.VolPlayer / vmax * VolH);
+                    for (int xx = left; xx < left + Body; xx++)
+                    {
+                        if (hn > 0) VLine(px, xx, volY0, volY0 + hn - 1, VolNpc);
+                        if (hm > 0) VLine(px, xx, volY0 + hn, volY0 + hn + hm - 1, VolMe);
+                    }
+                }
+                for (int i = 1; i < ma.Count; i++) Line(px, x0 + (i - 1) * Step + Body / 2, y(ma[i - 1]), x0 + i * Step + Body / 2, y(ma[i]), Ma);
+                if (threshold > 0) { int ty = y(threshold); for (int xx = Pad; xx < W - Pad; xx++) if ((xx / 3) % 2 == 0) Set(px, xx, ty, Thr); }
+            }
+            s.Tex.SetPixels32(px);
+            s.Tex.Apply(false);
+            return s.Sprite;
+        }
+
+        /// <summary>图上方的一行说明：最高、最低、最新收盘，涨跌。</summary>
+        public static string Caption(IList<Candle> all)
+        {
+            var c = all.Skip(Math.Max(0, all.Count - Days)).ToList();
+            if (c.Count == 0) return L.T("chart.empty");
+            var last = c[c.Count - 1];
+            double prev = c.Count > 1 ? c[c.Count - 2].C : last.O, chg = prev > 0 ? last.C / prev - 1 : 0;
+            return L.T("chart.caption", c.Count, Fmt.Num(c.Max(x => x.H)), Fmt.Num(c.Min(x => x.L)), Fmt.Num(last.C), (chg * 100).ToString("+0.0;-0.0;0.0", CultureInfo.InvariantCulture));
+        }
+
+        private static void Set(Color32[] px, int x, int y, Color32 c) { if (x >= 0 && x < W && y >= 0 && y < H) px[y * W + x] = c; }
+        private static void HLine(Color32[] px, int x0, int x1, int y, Color32 c) { for (int x = x0; x <= x1; x++) Set(px, x, y, c); }
+        private static void VLine(Color32[] px, int x, int y0, int y1, Color32 c) { if (y1 < y0) (y0, y1) = (y1, y0); for (int y = y0; y <= y1; y++) Set(px, x, y, c); }
+
+        private static void Line(Color32[] px, int x0, int y0, int x1, int y1, Color32 c)
+        {
+            int dx = Math.Abs(x1 - x0), dy = -Math.Abs(y1 - y0), sx = x0 < x1 ? 1 : -1, sy = y0 < y1 ? 1 : -1, err = dx + dy;
+            while (true)
+            {
+                Set(px, x0, y0, c);
+                if (x0 == x1 && y0 == y1) break;
+                int e2 = 2 * err;
+                if (e2 >= dy) { err += dy; x0 += sx; }
+                if (e2 <= dx) { err += dx; y0 += sy; }
+            }
+        }
+
+        /// <summary>把图放进界面：说明一行、图、图例一行。</summary>
+        public static void Add(CustomUIBuilder b, string key, IList<Candle> all, double threshold = 0)
+        {
+            b.AddLabel(Caption(all));
+            b.AddImage(Render(key, all, threshold), W * Scale, H * Scale);
+            b.AddLabel(L.T(threshold > 0 ? "chart.legend.thr" : "chart.legend"));
+        }
+    }
+}