Exemple #1
0
        public bool Select(Shape parentShape, Shape componentShape, SemanticSelector selector)
        {
            var componentShapeType = componentShape.GetType();

            if (componentShapeType != typeof(Quad))
            {
                throw new ArgumentException($"'{nameof(Box)}' cannot have a '{componentShapeType.Name}' as a component");
            }
            var cN = componentShape.Transform.GetZAxis();

            switch (selector)
            {
            case SemanticSelector.BOTTOM:
            {
                var pY  = parentShape.Transform.GetYAxis();
                var dot = Vector3.Dot(pY, cN);
                return(dot <= -_DotThreshold);        /* Y and N are almost parallel and point to same direction */
            }

            case SemanticSelector.TOP:
            {
                var pY  = parentShape.Transform.GetYAxis();
                var dot = Vector3.Dot(pY, cN);
                return(dot >= _DotThreshold);        /* Y and N are almost parallel and point to opposite directions */
            }

            case SemanticSelector.BACK:
            {
                var pZ  = parentShape.Transform.GetZAxis();
                var dot = Vector3.Dot(pZ, cN);
                return(dot <= -_DotThreshold);        /* Z and N are almost parallel and point to same direction */
            }

            case SemanticSelector.FRONT:
            {
                var pZ  = parentShape.Transform.GetZAxis();
                var dot = Vector3.Dot(pZ, cN);
                return(dot >= _DotThreshold);        /* Z and N are almost parallel and point to opposite directions */
            }

            case SemanticSelector.RIGHT:
            {
                var pX  = parentShape.Transform.GetXAxis();
                var dot = Vector3.Dot(pX, cN);
                return(dot >= _DotThreshold);        /* X and N are almost parallel and point to same direction */
            }

            case SemanticSelector.LEFT:
            {
                var pX  = parentShape.Transform.GetXAxis();
                var dot = Vector3.Dot(pX, cN);
                return(dot <= -_DotThreshold);        /* X and N are almost parallel and point to opposite directions */
            }

            case SemanticSelector.HORIZONTAL:
            {
                var pY     = parentShape.Transform.GetYAxis();
                var absDot = Math.Abs(Vector3.Dot(pY, cN));
                return(absDot >= _DotThreshold);        /* Y and N are almost parallel */
            }

            case SemanticSelector.VERTICAL:
            case SemanticSelector.SIDE:
            {
                var pY     = parentShape.Transform.GetYAxis();
                var absDot = Math.Abs(Vector3.Dot(pY, cN));
                return(absDot <= _Epsilon);        /* Y and N are almost perpendicular */
            }

            case SemanticSelector.ALL:
                return(true);    /* permissive */

            default:
                throw new Exception($"Unknown {nameof(SemanticSelector)}: '{selector.ToString()}'");
            }
        }
Exemple #2
0
 public ComponentSplitArg(SemanticSelector selector, ISymbol successor)
 {
     Selector  = selector;
     Successor = successor ?? throw new ArgumentNullException(nameof(successor));
 }