announcement method

void announcement({ required String msg, required String preformat, required Color tl, required Color tr, required Color bl, required Color br, bool clip = false, bool thick = false, bool fringes = false, })

Implementation

void announcement(
    {required String msg,
    required String preformat,
    required Color tl,
    required Color tr,
    required Color bl,
    required Color br,
    bool clip = false,
    bool thick = false,
    bool fringes = false}) {
  List<String> message = msg.split("\n");

  if (message.last.trim().isEmpty) {
    message.removeLast();
  }

  message = message.map((String s) => s.trim()).toList();

  int vpad = 1 + (thick ? 1 : 0);
  int h = message.length + vpad * 2;
  int w = message.fold(
          0, (int prev, String element) => max(prev, element.length)) +
      6;
  w = w % 2 == 0 ? w + 1 : w;

  double d1len = 1 / h;
  double d1wid = 1 / w;
  HsvColor hsvtl = tl.toHsvColor();
  HsvColor hsvtr = tr.toHsvColor();
  HsvColor hsvbl = bl.toHsvColor();
  HsvColor hsvbr = br.toHsvColor();
  String m = "";
  print("");
  for (int i = 0; i < h; i++) {
    double ht = i * d1len;

    StringBuffer sb = StringBuffer();

    if (i > vpad - 1 && i < h - vpad) {
      m = "${" " * ((w - message[i - vpad].length) ~/ 2)}${message[i - vpad]}";
    }

    for (int j = 0; j < w; j++) {
      double wt = j * d1wid;

      HsvColor left = HsvColor(
        _lerp(hsvtl.h.toDouble(), hsvbl.h.toDouble(), ht),
        _lerp(hsvtl.s.toDouble(), hsvbl.s.toDouble(), ht),
        _lerp(hsvtl.v.toDouble(), hsvbl.v.toDouble(), ht),
      );

      HsvColor right = HsvColor(
        _lerp(hsvtr.h.toDouble(), hsvbr.h.toDouble(), ht),
        _lerp(hsvtr.s.toDouble(), hsvbr.s.toDouble(), ht),
        _lerp(hsvtr.v.toDouble(), hsvbr.v.toDouble(), ht),
      );

      HexColor c = HsvColor(
        _lerp(left.h.toDouble(), right.h.toDouble(), wt) % 360,
        _lerp(left.s.toDouble(), right.s.toDouble(), wt),
        _lerp(left.v.toDouble(), right.v.toDouble(), wt),
      ).toHexColor();

      if (fringes && (i == 0 || i + 1 == h) && j % 2 == 0) {
        c = Color.hex("#000000").toHexColor();
      }

      if (clip && ((i == 0 || i + 1 == h) && (j == 0 || j + 1 == w))) {
        c = Color.hex("#000000").toHexColor();
      }

      sb.write(
          "$_bgc(${c.toCssString()})${i > vpad - 1 && i < h - vpad && j < m.length ? m[j] == " " ? m[j] : "$preformat${m[j]}${j + 1 == m.length ? "&r" : ""}" : " "}");
    }

    print(sb.toString().chatColor);
  }
  print("");
}