microting/ngx-charts

/**
 * Generates a rounded rectanglar path
 *
 * @export
 * @param {*} x, y, w, h, r, tl, tr, bl, br
 * @returns {string}
 */
export function roundedRect(x, y, w, h, r, [tl, tr, bl, br]: boolean[]) {
  let retval = '';

  w = Math.floor(w);
  h = Math.floor(h);

  w = w === 0 ? 1 : w;
  h = h === 0 ? 1 : h;

  retval = `M${[x + r, y]}`;
  retval += `h${w - 2 * r}`;

  if (tr) {
    retval += `a${[r, r]} 0 0 1 ${[r, r]}`;
  } else {
    retval += `h${r}v${r}`;
  }

  retval += `v${h - 2 * r}`;

  if (br) {
    retval += `a${[r, r]} 0 0 1 ${[-r, r]}`;
  } else {
    retval += `v${r}h${-r}`;
  }

  retval += `h${2 * r - w}`;

  if (bl) {
    retval += `a${[r, r]} 0 0 1 ${[-r, -r]}`;
  } else {
    retval += `h${-r}v${-r}`;
  }

  retval += `v${2 * r - h}`;

  if (tl) {
    retval += `a${[r, r]} 0 0 1 ${[r, -r]}`;
  } else {
    retval += `v${-r}h${r}`;
  }

  retval += `z`;

  return retval;
}