public TriangleVertices GetVerticesForCoordinate(TriangleCoordinate coordinate)
{
//Check if coordinate is valid:
if (coordinate == null || CharToNum(coordinate.Row) > RowCount() || coordinate.Column > ColumnCount() ||
coordinate.Column < 0)
{
return(null);
}
//Odds are at the bottom of the sqr
var isTop = coordinate.Column % 2 == 0;
//top-left vertex:
int topLeftX = (int)(Math.Ceiling(coordinate.Column / 2d) - 1) * _sqrSize;
var topLeftY = _imgSize - ((CharToNum(coordinate.Row) - 1) * _sqrSize);
//bottom-right vertex
var bottomRightX = (int)Math.Ceiling(coordinate.Column / 2d) * _sqrSize;
var bottomRightY = _imgSize - (CharToNum(coordinate.Row) * _sqrSize);
//right-angle vertex
var midX = isTop ? bottomRightX : topLeftX;
var midY = isTop ? topLeftY : bottomRightY;
return(new TriangleVertices(
topLeftX, topLeftY,
bottomRightX, bottomRightY,
midX, midY));
}
