Function writeLabelImage

server.js:326–347

(text, targetPath)

}

async function writeLabelImage(text, targetPath) {
  const paddingX = 16;
  const paddingY = 12;
  const lineGap = 8;
  const maxWidth = 1232;
  let scale = 4;
  let wrapped = wrapLabelText(text, maxWidth - paddingX * 2, scale);
  while (wrapped.truncated && scale > 2) {
    scale -= 1;
    wrapped = wrapLabelText(text, maxWidth - paddingX * 2, scale);
  }

  const textWidth = Math.max(...wrapped.lines.map(line => textPixelWidth(line, scale)));
  const width = Math.min(maxWidth, Math.max(1, textWidth + paddingX * 2));
  const height = paddingY * 2 + wrapped.lines.length * 7 * scale + (wrapped.lines.length - 1) * lineGap;
  const rgba = Buffer.alloc(width * height * 4);
  fillRect(rgba, width, 0, 0, width, height, [0, 0, 0, 174]);
  wrapped.lines.forEach((line, index) => {
    drawBitmapText(rgba, width, paddingX, paddingY + index * (7 * scale + lineGap), line, scale);
  });
  await fsp.writeFile(targetPath, encodePng(width, height, rgba));
}

function stitchLabel(options, tone) {
  const parts = [];