slangin/menu.ino

/*
Slangin'
Menu Helpers
Author: Rudis Muiznieks
License: WTFPL
*/

const uint8_t PROGMEM spriteMenuCursor[] = {
  3, 5,
  0x1f, 0x0e, 0x04,
};

void computeMenuSizes(const bool small, const bool cols,
    const int itemCount, const String items[],
    int& x1, int& x2, int& y) {
  const int charWidth = small ? 4 : 5;
  const int charHeight = small ? 8 : 9;

  if (cols) { // two colums
    int col1Count = round(itemCount / 2.0);
    int col2Count = itemCount - col1Count;
    int col1Width = 0;
    int col2Width = 0;
    for (int i = 0; i < col1Count; i++) {
      const int newLen = items[i].length();
      if (newLen > col1Width) col1Width = newLen;
    }
    for (int i = 0; i < col2Count; i++) {
      const int newLen = items[i + col1Count].length();
      if (newLen > col2Width) col2Width = newLen;
    }
    x1 = 66 - round((col1Width + col2Width + 1.75) * (charWidth / 2.0));
    x2 = x1 + round((col1Width + 1.75) * charWidth);
    y = 42 - round(col1Count * (charHeight / 2.0));
  } else { // one column
    int colWidth = 0;
    for (int i = 0; i < itemCount; i++) {
      const int newLen = items[i].length();
      if (newLen > colWidth) colWidth = newLen;
    }
    x1 = 66 - round(colWidth * (charWidth / 2.0));
    x2 = -1;
    y = 42 - round(itemCount * (charHeight / 2.0));
  }
}

void drawMenu(const bool small, const bool cols,
    const int itemCount, const String items[]) {
  const int charWidth = small ? 4 : 5;
  const int charHeight = small ? 8 : 9;
  int x1, x2, y;
  computeMenuSizes(small, cols, itemCount, items, x1, x2, y);
  const int col1Count = round(itemCount / 2.0);
  for (int i = 0; i < itemCount; i++) {
    int cx, cy;
    if (cols) { // two columns
      const bool col1 = i < col1Count;
      cx = col1 ? x1 : x2;
      cy = col1
        ? i * charHeight + y
        : (i - col1Count) * charHeight + y;
    } else { // one column
      cx = x1;
      cy = i * charHeight + y;
    }
    if (small) {
      font3x5.setCursor(cx, cy);
      font3x5.print(items[i]);
    } else {
      font4x6.setCursor(cx, cy);
      font4x6.print(items[i]);
    }
  }
}

void drawMenuIndicator(const int menuSelected, const bool small,
    const bool cols, const int itemCount, const String items[],
    const bool clear) {
  const int charWidth = small ? 4 : 5;
  const int charHeight = small ? 8 : 9;
  int x1, x2, y;
  computeMenuSizes(small, cols, itemCount, items, x1, x2, y);
  int cx, cy;
  if (cols) { // two columns
    const int col1Count = round(itemCount / 2.0);
    const bool col1 = menuSelected < col1Count;
    cx = col1 ? x1 : x2;
    cy = col1
      ? menuSelected * charHeight + y
      : (menuSelected - col1Count) * charHeight + y;
  } else { // one column
    cx = x1;
    cy = menuSelected * charHeight + y;
  }
  if (clear) {
    arduboy.fillRect(cx - 4, cy + (small ? 1 : 2), 3, 5, BLACK);
  } else {
    Sprites::drawOverwrite(cx - 4, cy + (small ? 1 : 2), spriteMenuCursor, 0);
  }
}