calculateBoundaryWithSymbol method

MapRectangle calculateBoundaryWithSymbol(MapPositioning pos, double fontWidth, double fontHeight)

Implementation

MapRectangle calculateBoundaryWithSymbol(MapPositioning pos, double fontWidth, double fontHeight) {
  assert(fontWidth > 0, "fontWidth must be positive ($fontWidth)");
  assert(fontWidth < 10000, "fontWidth must be less than 10000 ($fontWidth)");
  assert(fontHeight > 0, "fontHeight must be positive ($fontHeight)");
  assert(fontHeight < 10000, "fontHeight must be less than 10000 ($fontHeight)");
  //    print("captoin: $pos $fontWidth $fontHeight $symbolBoundary for caption $textKey");
  MapRectangle? symBoundary = symbolBoundary;
  if (pos == MapPositioning.CENTER && symBoundary != null) {
    // sensible defaults: below if symbolContainer is present, center if not
    pos = MapPositioning.BELOW;
  }

  if (symBoundary == null) {
    // symbol not available, draw the text at the center
    pos = MapPositioning.CENTER;
    symBoundary = const MapRectangle.zero();
  }

  double halfWidth = fontWidth / 2;
  double halfHeight = fontHeight / 2;

  switch (pos) {
    case MapPositioning.AUTO:
    case MapPositioning.CENTER:
      boundary = MapRectangle(-halfWidth, -halfHeight + dy, halfWidth, halfHeight + dy);
      break;
    case MapPositioning.BELOW:
      boundary = MapRectangle(-halfWidth, symBoundary.bottom + 0 + gap + dy, halfWidth, symBoundary.bottom + fontHeight + gap + dy);
      break;
    case MapPositioning.BELOW_LEFT:
      boundary = MapRectangle(
        symBoundary.left - fontWidth - gap,
        symBoundary.bottom + 0 + gap + dy,
        symBoundary.left - 0 - gap,
        symBoundary.bottom + fontHeight + gap + dy,
      );
      break;
    case MapPositioning.BELOW_RIGHT:
      boundary = MapRectangle(
        symBoundary.right + 0 + gap,
        symBoundary.bottom + 0 + gap + dy,
        symBoundary.right + fontWidth + gap,
        symBoundary.bottom + fontHeight + gap + dy,
      );
      break;
    case MapPositioning.ABOVE:
      boundary = MapRectangle(-halfWidth, symBoundary.top - fontHeight - gap + dy, halfWidth, symBoundary.top - 0 - gap + dy);
      break;
    case MapPositioning.ABOVE_LEFT:
      boundary = MapRectangle(
        symBoundary.left - fontWidth - gap,
        symBoundary.top - fontHeight - gap + dy,
        symBoundary.left - 0 - gap,
        symBoundary.top + 0 - gap + dy,
      );
      break;
    case MapPositioning.ABOVE_RIGHT:
      boundary = MapRectangle(
        symBoundary.right + 0 + gap,
        symBoundary.top - fontHeight - gap + dy,
        symBoundary.right + fontWidth + gap,
        symBoundary.top + 0 - gap + dy,
      );
      break;
    case MapPositioning.LEFT:
      boundary = MapRectangle(symBoundary.left - fontWidth - gap, -halfHeight + dy, symBoundary.left - 0 - gap, halfHeight + dy);
      break;
    case MapPositioning.RIGHT:
      boundary = MapRectangle(symBoundary.right + 0 + gap, -halfHeight + dy, symBoundary.right + fontHeight + gap, halfHeight + dy);
      break;
  }
  return boundary!;
}