/// <summary>
/// Returns an array of points representing a graph in polar coordinates
/// </summary>
/// <param name="expression">What to graph</param>
/// <param name="start">Theta value to begin at</param>
/// <param name="stop">Theta value to end at</param>
/// <param name="step">Theta resolution</param>
/// <returns></returns>
public static double[,] GraphPolar(ExpressionD expression, double start, double stop, double step)
{
if (start >= stop || step <= 0)
{
throw new Exception("Cannot graph polar, invalid arguments");
}
double[,] result;
ArrayList points = new ArrayList();
//Perform calculations
ExpressionD.AddSymbol("i", 0);
int index = 0;
double theta;
for (double i = start; i < stop; i += step)
{
ExpressionD.SetSymbolValue("i", i * Math.PI / 180.0);
theta = i * Math.PI / 180.0;
points.Add(new Point3(
expression.Evaluate() * Math.Sin(theta),
expression.Evaluate() * Math.Cos(theta),
0
));
index++;
}
ExpressionD.RemoveSymbol("i");
//Convert
result = new double[3, points.Count];
int count = 0;
foreach (Point3 p in points)
{
result[0, count] = p.x;
result[1, count] = p.y;
result[2, count] = p.z;
count++;
}
return(result);
}
public override void Recalculate()
{
//base.Recalculate();
//Setup expression values
ExpressionD.AddSymbol("dist", 0);
ExpressionD.AddSymbol("length", length);
ExpressionD.AddSymbol("xslope", 0);
ExpressionD.AddSymbol("yslope", 0);
ExpressionD.AddSymbol("zslope", 0);
//Set the properties of the child objects
foreach (PenVertex penVert in vertecies)
{
//Set variables
ExpressionD.SetSymbolValue("dist", penVert.distance);
ExpressionD.SetSymbolValue("xslope", penVert.slope[0]);
ExpressionD.SetSymbolValue("yslope", penVert.slope[1]);
ExpressionD.SetSymbolValue("zslope", penVert.slope[2]);
//Calculate
color.Recalculate();
//Set
((SimpleObject3)penVert.obj).Recalculate();
((SimpleObject3)penVert.obj).SetColor(color.Values());
((SimpleObject3)penVert.obj).ScaleGeo(scale.Evaluate());
((SimpleObject3)penVert.obj).TranslateGeo(penVert.x, penVert.y, penVert.z);
}
//Remove them as the program leaves scope
ExpressionD.RemoveSymbol("dist");
ExpressionD.RemoveSymbol("length");
ExpressionD.RemoveSymbol("xslope");
ExpressionD.RemoveSymbol("yslope");
ExpressionD.RemoveSymbol("zslope");
}
