//
// (a - b) + c
// a + (b - c) = (b - c) + a
//
// First subtraction x = (a - b)...then append (x + c).
//
private static List <FigSynthProblem> ConstructParenSubtractionThenAppend(List <ShapeType> shapes)
{
//
// Construct a - b
//
Figure defaultLargeFigure = Figure.ConstructDefaultShape(shapes[0]);
List <FigSynthProblem> aMinusB = SubtractShape(defaultLargeFigure, shapes[1]);
//
// For each of the aMinusB problems, the outer bounds is defined by a shape; append the new shape.
//
List <FigSynthProblem> newSynths = new List <FigSynthProblem>();
foreach (FigSynthProblem top in aMinusB)
{
List <FigSynthProblem> bMinusC = AddShape(((top as BinarySynthOperation).leftProblem as UnarySynth).figure, shapes[2]);
foreach (FigSynthProblem bc in bMinusC)
{
newSynths.Add(FigSynthProblem.AppendAddition(top, bc));
}
}
return(newSynths);
}
//
// Append to an existent problem.
//
public static List <FigSynthProblem> AddShape(FigSynthProblem problem, ShapeType type)
{
// Create a polygon based only on exterior segments.
Polygon outer = Polygon.MakePolygon(problem.GetExteriorSegments());
// Append the shapes
List <FigSynthProblem> newSynths = AddShape(outer, type);
// Create the new problems by appending.
List <FigSynthProblem> appended = new List <FigSynthProblem>();
foreach (FigSynthProblem synth in newSynths)
{
appended.Add(FigSynthProblem.AppendAddition(problem, synth));
}
return(appended);
}
