65 lines
2.0 KiB
C#
65 lines
2.0 KiB
C#
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using LensSimulatorCore.Shapes;
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using static System.Double;
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namespace LensSimulatorCore.Optical;
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/// <summary>
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/// Contains the function to find intersection of two Lines.
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/// </summary>
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class FlatSurface : Surface
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{
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public override void UpdateSurfacePositions()
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{
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SideSign = IsFront ? -1 : 1;
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_face = new Line(0, SideSign * Parent.Depth / 2);
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}
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//This line is defined as x = by+c. It will need converting to y = bx+c.
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private Line _face;
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/// <summary>
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/// This function takes a PointVector and checks if there a collision between itself and a Line.
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/// </summary>
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/// <param name="pointVector">A PointVector where (1,0) is 0 rad.</param>
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/// <returns></returns>
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public override Point FindIntersection(PointVector pointVector)
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{
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//Converts point vector to a line.
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Line line = pointVector.ToLine();
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//This is where the conversion takes place to make it y = bx + c.
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Line surfaceLine = new Line(1 / _face.B, (1 / _face.B) * _face.C);
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double x, y, t, u;
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//If C is infinity it means the line is vertical and can be solved by inserting x into the equation.
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if (IsInfinity(surfaceLine.C))
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{
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y = (line.B * _face.C) + line.C;
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x = _face.C;
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}
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else //If not it means it is angled and therefore needs solving by substitution.
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{
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t = line.B + surfaceLine.B;
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u = line.C + surfaceLine.C;
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x = t / u;
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y = (line.B * x) + line.C;
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}
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return new Point(x, y);
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}
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/// <summary>
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/// Generates a PolyLine, which can be merged with another to make a full element shape.
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/// </summary>
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public override void GeneratePolyLine()
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{
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PolyLine.Add(new Point(-SideSign * Parent.Depth / 2, SideSign * -Parent.Diameter / 2));
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PolyLine.Add(new Point(-SideSign * Parent.Depth / 2, SideSign * Parent.Diameter / 2));
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}
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protected FlatSurface(Element parent) : base(parent)
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{
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}
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}
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