public override char GetChar (LineChar charCenter, LineChar charLeft, LineChar charTop, LineChar charRight, LineChar charBottom)
{
if (charCenter.IsEmpty())
return '\0';
// 0 connections
if (charLeft.IsNone() && charTop.IsNone() && charRight.IsNone() && charBottom.IsNone())
return GetSimpleChar(charCenter, MapSimple);
bool connectLeft = charCenter.IsHorizontal() && charLeft.IsHorizontal();
bool connectTop = charCenter.IsVertical() && charTop.IsVertical();
bool connectRight = charCenter.IsHorizontal() && charRight.IsHorizontal();
bool connectBottom = charCenter.IsVertical() && charBottom.IsVertical();
// 1 connection
if ((connectLeft ? 1 : 0) + (connectTop ? 1 : 0) + (connectRight ? 1 : 0) + (connectBottom ? 1 : 0) <= 1)
return GetSimpleChar(charCenter, MapSimple);
// 4 connections
if (connectLeft && connectTop && connectRight && connectBottom)
return GetChar(charCenter, MapLeftTopRightBottom);
// 3 connections
if (connectLeft && connectTop && connectRight)
return GetChar(charCenter, MapLeftTopRight);
if (connectLeft && connectTop && connectBottom)
return GetChar(charCenter, MapLeftTopBottom);
if (connectLeft && connectRight && connectBottom)
return GetChar(charCenter, MapLeftRightBottom);
if (connectTop && connectRight && connectBottom)
return GetChar(charCenter, MapTopRightBottom);
// 2 connections
if (connectTop && connectLeft)
return GetChar(charCenter, MapTopLeft);
if (connectTop && connectRight)
return GetChar(charCenter, MapTopRight);
if (connectBottom && connectRight)
return GetChar(charCenter, MapBottomRight);
if (connectBottom && connectLeft)
return GetChar(charCenter, MapBottomLeft);
if ((connectLeft && connectRight) || (connectTop && connectBottom))
return GetSimpleChar(charCenter, MapSimple);
throw GetCharException(charCenter, charLeft, charTop, charRight, charBottom);
}
private static char GetSimpleChar (LineChar charCenter, char[] map)
{
Debug.Assert(map.Length == 8);
switch (charCenter) {
case LineChar.Horizontal:
return map[0];
case LineChar.Horizontal | LineChar.HorizontalWide:
return map[1];
case LineChar.Vertical:
return map[2];
case LineChar.Vertical | LineChar.VerticalWide:
return map[3];
case LineChar.Horizontal | LineChar.Vertical:
return map[4];
case LineChar.Horizontal | LineChar.Vertical | LineChar.HorizontalWide:
return map[5];
case LineChar.Horizontal | LineChar.Vertical | LineChar.VerticalWide:
return map[6];
case LineChar.Horizontal | LineChar.Vertical | LineChar.HorizontalWide | LineChar.VerticalWide:
return map[7];
default:
throw new ArgumentOutOfRangeException(nameof(charCenter));
}
}
protected static Exception GetCharException (LineChar charCenter, LineChar charLeft, LineChar charTop, LineChar charRight, LineChar charBottom)
{
return new NotSupportedException($"Line joint not supported: {charCenter} ({charLeft} {charTop} {charRight} {charBottom}).");
}
public abstract char GetChar (LineChar charCenter, LineChar charLeft, LineChar charTop, LineChar charRight, LineChar charBottom);
public override char GetChar (LineChar charCenter, LineChar charLeft, LineChar charTop, LineChar charRight, LineChar charBottom)
{
return _c;
}
public override char GetChar (LineChar charCenter, LineChar charLeft, LineChar charTop, LineChar charRight, LineChar charBottom)
{
if (charCenter.IsEmpty())
return '\0';
if (charCenter.IsHorizontal() && charCenter.IsVertical())
return '+';
if (charCenter.IsHorizontal())
return charCenter.IsHorizontalWide() ? '=' : '-';
if (charCenter.IsVertical())
return '|';
throw GetCharException(charCenter, charLeft, charTop, charRight, charBottom);
}
private static char GetChar (LineChar charCenter, char[] map)
{
Debug.Assert(map.Length == 4);
if (!charCenter.IsHorizontalWide() && !charCenter.IsVerticalWide())
return map[0];
if (charCenter.IsHorizontalWide() && !charCenter.IsVerticalWide())
return map[1];
if (!charCenter.IsHorizontalWide() && charCenter.IsVerticalWide())
return map[2];
if (charCenter.IsHorizontalWide() && charCenter.IsVerticalWide())
return map[3];
throw new ArgumentOutOfRangeException(nameof(charCenter));
}
