@thi.ng/text-canvas/hvline.js

Text based canvas, drawing, plotting, tables with arbitrary formatting (incl. ANSI/HTML)

import { peek } from "@thi.ng/arrays/peek";
import { charCode } from "./utils.js";
const hline = (canvas, x, y, len, s, e, m, format = canvas.format) => {
  const { x1, y1, x2, y2 } = peek(canvas.clipRects);
  if (len < 1 || y < y1 || y >= y2 || x >= x2) return;
  _hvline(
    canvas.data,
    x,
    y,
    1,
    canvas.width,
    x1,
    x2,
    len,
    format,
    peek(canvas.styles).hl,
    s,
    e,
    m
  );
};
const vline = (canvas, x, y, len, s, e, m, format = canvas.format) => {
  const { x1, x2, y1, y2 } = peek(canvas.clipRects);
  if (len < 1 || x < x1 || x >= x2 || y >= y2) return;
  _hvline(
    canvas.data,
    y,
    x,
    canvas.width,
    1,
    y1,
    y2,
    len,
    format,
    peek(canvas.styles).vl,
    s,
    e,
    m
  );
};
const _hvline = (buf, a, b, astride, bstride, amin, amax, len, format, style, s, e, m) => {
  a |= 0;
  b |= 0;
  len |= 0;
  let idx;
  if (a < amin) {
    len += a - amin;
    a = amin;
    idx = a * astride + b * bstride;
  } else {
    idx = a * astride + b * bstride;
    buf[idx] = charCode(s !== void 0 && len > 1 ? s : style, format);
    idx += astride;
    a++;
    len--;
  }
  len--;
  m = charCode(m != void 0 ? m : style, format);
  for (let i = 0; i < len && a < amax; i++, a++, idx += astride) {
    buf[idx] = m;
  }
  if (len >= 0 && a < amax) {
    buf[idx] = charCode(e !== void 0 ? e : style, format);
  }
};
export {
  hline,
  vline
};