public Cone( double radius, double height )
{
IExpression fx = new MultExpression(
new MultExpression(
new SubExpression(
new ConstantExpression( height ),
new VariableExpression( "v" ) ),
new ConstantExpression( radius/height ) ),
new CosineExpression(
new VariableExpression( "u" ) ) );
IExpression fy = new VariableExpression( "v" );
IExpression fz = new MultExpression(
new MultExpression(
new SubExpression(
new ConstantExpression( height ),
new VariableExpression( "v" ) ),
new ConstantExpression( radius/height ) ),
new SineExpression(
new NegateExpression(
new VariableExpression( "u" ) ) ) );
Init( fx, fy, fz, -Math.PI, Math.PI, 0.0, height );
}
public Cone(double radius, double height)
{
IExpression fx = new MultExpression(
new MultExpression(
new SubExpression(
new ConstantExpression(height),
new VariableExpression("v")),
new ConstantExpression(radius / height)),
new CosineExpression(
new VariableExpression("u")));
IExpression fy = new VariableExpression("v");
IExpression fz = new MultExpression(
new MultExpression(
new SubExpression(
new ConstantExpression(height),
new VariableExpression("v")),
new ConstantExpression(radius / height)),
new SineExpression(
new NegateExpression(
new VariableExpression("u"))));
Init(fx, fy, fz, -Math.PI, Math.PI, 0.0, height);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
private static IExpression ParseFactor()
{
IExpression exp = null;
do
{
IExpression right = null;
switch ( CurrentToken.type )
{
case TokenType.Variable:
right = new VariableExpression( CurrentToken.value );
Eat( TokenType.Variable );
break;
case TokenType.Sine:
case TokenType.Cosine:
case TokenType.Tangent:
right = ParseFunction();
break;
case TokenType.OpenParen:
Eat( TokenType.OpenParen );
right = ParseAddExpression();
Eat( TokenType.CloseParen );
break;
default:
throw new UnexpectedBehaviorException( "Unexpected token in Factor: " + CurrentToken.type );
}
exp = ( exp == null ) ? right : new MultExpression( exp, right );
} while ( Check( FirstFactor ) );
return exp;
}
/// <summary>
/// Creates a mesh with a horizontal and vertical resolution indicated
/// by the input parameters. It will generate
/// (precisionU-1)*(precisionV-1) quads.
/// </summary>
public Model3DGroup CreateWireframeModel(int precisionU, int precisionV)
{
lengthX = precisionU;
lengthY = precisionV;
du = (uMax - uMin) / (double)(precisionU - 1);
dv = (vMax - vMin) / (double)(precisionV - 1);
positions = new Point3D[lengthX, lengthY];
double v = vMin;
for (int y = 0; y < lengthY; y++)
{
double u = uMin;
if (y == lengthY - 1)
{
v = vMax;
}
for (int x = 0; x < lengthX; x++)
{
if (x == lengthX - 1)
{
u = uMax;
}
VariableExpression.Define("u", u);
VariableExpression.Define("v", v);
positions[x, y] = Evaluate();
u += du;
}
v += dv;
}
VariableExpression.Undefine("u");
VariableExpression.Undefine("v");
Model3DGroup group = new Model3DGroup();
// TODO: Remove
//ScreenSpaceLines3D lines;
/*
* // Create Horizontal lines
* for ( int y = 0; y < lengthY; y++ )
* {
* lines = new ScreenSpaceLines3D();
* lines.Color = Colors.Black;
* lines.Thickness = 1;
* for ( int x = 0; x < lengthX; x++ )
* {
* lines.Points.Add( positions[ x,y ] );
* }
* group.Children.Add( lines );
* }
*
* // Create Vertical lines
* for ( int x = 0; x < lengthX; x++ )
* {
* lines = new ScreenSpaceLines3D();
* lines.Color = Colors.Black;
* lines.Thickness = 1;
* for ( int y = 0; y < lengthY; y++ )
* {
* lines.Points.Add( positions[ x,y ] );
* }
* group.Children.Add( lines );
* }
*/
return(group);
}