Function renderWordCloud

cy/cy.ts:300–318

(words: WordItem[], limit: number, validMessages: number)

}

function renderWordCloud(words: WordItem[], limit: number, validMessages: number): Buffer {
  ensureCjkFont();
  const canvas = createCanvas(WIDTH, HEIGHT);
  const ctx = canvas.getContext("2d");
  ctx.fillStyle = "#ffffff";
  ctx.fillRect(0, 0, WIDTH, HEIGHT);

  const placed = layoutWords(ctx, words);
  for (const item of placed) {
    ctx.font = `700 ${item.size}px ${CJK_FONT_STACK}`;
    ctx.fillStyle = item.color;
    ctx.fillText(item.word, item.x || 0, item.y || 0);
  }

  ctx.fillStyle = "#111827";
  ctx.font = `34px ${CJK_FONT_STACK}`;
  ctx.fillText(`最近 ${limit} 条热词云 | ${validMessages} 条有效消息`, 42, HEIGHT - 34);
  return canvas.toBuffer("image/png");
}

async function fetchRecentMessages(client: any, peer: any, limit: number): Promise<Api.Message[]> {
  if (!peer || !client) return [];