Update 2025-04-13_17:31:30

static/chart.js

@@ -0,0 +1,65 @@
+export async function drawLineChart() {
+  const res = await fetch("/api/stats");
+  const data = await res.json();
+
+  const canvas = document.getElementById("scoreChart");
+  const ctx = canvas.getContext("2d");
+  ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+  const allDays = Array.from(new Set(
+    Object.values(data).flat().map(d => d.day)
+  )).sort();
+
+  const maxScore = Math.max(
+    ...Object.values(data).flat().map(d => d.avg_score)
+  );
+
+  const padding = 50;
+  const chartW = canvas.width - padding * 2;
+  const chartH = canvas.height - padding * 2;
+
+  // Axes
+  ctx.strokeStyle = "#000";
+  ctx.beginPath();
+  ctx.moveTo(padding, padding);
+  ctx.lineTo(padding, canvas.height - padding);
+  ctx.lineTo(canvas.width - padding, canvas.height - padding);
+  ctx.stroke();
+
+  const colors = ["#007bff", "#28a745", "#dc3545", "#ffc107", "#6f42c1"];
+  let playerIndex = 0;
+
+  for (const [player, entries] of Object.entries(data)) {
+    ctx.strokeStyle = colors[playerIndex % colors.length];
+    ctx.beginPath();
+
+    entries.forEach((entry, i) => {
+      const x = padding + (i * (chartW / (allDays.length - 1)));
+      const y = canvas.height - padding - ((entry.avg_score / maxScore) * chartH);
+
+      if (i === 0) ctx.moveTo(x, y);
+      else ctx.lineTo(x, y);
+
+      // draw point
+      ctx.beginPath();
+      ctx.arc(x, y, 3, 0, 2 * Math.PI);
+      ctx.fillStyle = ctx.strokeStyle;
+      ctx.fill();
+    });
+
+    ctx.stroke();
+
+    // Legend
+    ctx.fillStyle = ctx.strokeStyle;
+    ctx.fillText(player, canvas.width - 100, padding + playerIndex * 20);
+    playerIndex++;
+  }
+
+  // X axis labels
+  ctx.fillStyle = "#000";
+  allDays.forEach((day, i) => {
+    const x = padding + (i * (chartW / (allDays.length - 1)));
+    ctx.fillText(day.slice(5), x - 10, canvas.height - padding + 15);
+  });
+}
+