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) / (precisionU - 1);
_dv = (VMax - VMin) / (precisionV - 1);
_positions = new Point3D[_lengthX, _lengthY];
var v = VMin;
for (var y = 0; y < _lengthY; y++)
{
var u = UMin;
if (y == _lengthY - 1)
{
v = VMax;
}
for (var 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");
var 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);
}
