protected virtual SLExpression VisitSideLengthAndPositionSquare(SideLengthAndPositionSquareExpression perimeterAndSidePositionSquareExpression)
{
var lines = perimeterAndSidePositionSquareExpression.Lines.Select(Visit).ToArray();
var sidePosition = (TwoPointsLineExpression)Visit(perimeterAndSidePositionSquareExpression.SidePosition);
if (HasChanged(lines, perimeterAndSidePositionSquareExpression.Lines) ||
sidePosition != perimeterAndSidePositionSquareExpression.SidePosition)
{
return(new SideLengthAndPositionSquareExpression
{
LinesLengthToSideLengthFactor = perimeterAndSidePositionSquareExpression.LinesLengthToSideLengthFactor,
Lines = lines.Cast <LineExpression>().ToArray(),
SideDirection = perimeterAndSidePositionSquareExpression.SideDirection,
SidePosition = sidePosition,
});
}
return(perimeterAndSidePositionSquareExpression);
}
protected override SLExpression VisitSideLengthAndPositionSquare(SideLengthAndPositionSquareExpression expression)
{
var sidePositionAxis = (TwoPointsLineExpression)Visit(expression.SidePosition);
var axisLength = GetDistance(
(CoordinatesPointExpression)sidePositionAxis.Point1,
(CoordinatesPointExpression)sidePositionAxis.Point2);
var lines = expression.Lines.Select(Visit).Cast <TwoPointsLineExpression>().ToArray();
var totalLinesLength = lines.Select(l => GetDistance((CoordinatesPointExpression)l.Point1, (CoordinatesPointExpression)l.Point2)).Sum();
var factor = GetFactor(expression.LinesLengthToSideLengthFactor);
var sideLength = factor * totalLinesLength;
var sideAxisPoint1 = (CoordinatesPointExpression)sidePositionAxis.Point1;
var sideAxisPoint2 = (CoordinatesPointExpression)sidePositionAxis.Point2;
var sideCenter = GetEquidistantPoint(sideAxisPoint1, sideAxisPoint2);
var axisPoint1RelativePositionToCenterOfSide = sideAxisPoint1 - sideCenter;
var axisPoint2RelativePositionToCenterOfSide = sideAxisPoint2 - sideCenter;
var squareSideToAxisLengthFactor = sideLength / axisLength;
var squareCorner1 = axisPoint1RelativePositionToCenterOfSide * squareSideToAxisLengthFactor + sideCenter;
var squareCorner2 = axisPoint2RelativePositionToCenterOfSide * squareSideToAxisLengthFactor + sideCenter;
var otherSideDirection = axisPoint1RelativePositionToCenterOfSide * squareSideToAxisLengthFactor * 2;
otherSideDirection = new CoordinatesPointExpression
{
X = otherSideDirection.Y,
Y = -otherSideDirection.X,
};
if (expression.SideDirection == "right" || expression.SideDirection == "bottom")
{
otherSideDirection = otherSideDirection * -1;
}
var squareCorner3 = squareCorner1 + otherSideDirection;
var squareCorner4 = squareCorner2 + otherSideDirection;
return(new PolygonFromPointsExpression
{
Points = new[]
{
squareCorner1,
squareCorner2,
squareCorner4,
squareCorner3,
}
});
//return new PolygonFromLinesExpression
//{
// Lines = lines//.Take(1)
// .Concat(new[]
// {
// sidePositionAxis,
// }).ToArray(),
//};
}
protected override SLExpression VisitSideLengthAndPositionSquare(SideLengthAndPositionSquareExpression perimeterAndSidePositionSquareExpression)
{
this.PolygonLines = perimeterAndSidePositionSquareExpression.Lines;
return(base.VisitSideLengthAndPositionSquare(perimeterAndSidePositionSquareExpression));
}