OpenTK.BezierCurveQuadric Struct Reference

Represents a quadric bezier curve with two anchor and one control point. More...

List of all members.

Public Member Functions
	BezierCurveQuadric (Vector2 startAnchor, Vector2 endAnchor, Vector2 controlPoint)
	Constructs a new BezierCurveQuadric.
	BezierCurveQuadric (float parallel, Vector2 startAnchor, Vector2 endAnchor, Vector2 controlPoint)
	Constructs a new BezierCurveQuadric.
Vector2	CalculatePoint (float t)
	Calculates the point with the specified t.
float	CalculateLength (float precision)
	Calculates the length of this bezier curve.
Public Attributes
Vector2	StartAnchor
	Start anchor point.
Vector2	EndAnchor
	End anchor point.
Vector2	ControlPoint
	Control point, controls the direction of both endings of the curve.
float	Parallel
	The parallel value.

---

Detailed Description

Represents a quadric bezier curve with two anchor and one control point.

Definition at line 21 of file BezierCurveQuadric.cs.

---

Constructor & Destructor Documentation

OpenTK.BezierCurveQuadric.BezierCurveQuadric	(	Vector2	startAnchor,
		Vector2	endAnchor,
		Vector2	controlPoint
	)

Constructs a new BezierCurveQuadric.

Parameters:

	startAnchor	The start anchor.
	endAnchor	The end anchor.
	controlPoint	The control point.

Definition at line 59 of file BezierCurveQuadric.cs.

        {
            this.StartAnchor = startAnchor;
            this.EndAnchor = endAnchor;
            this.ControlPoint = controlPoint;
            this.Parallel = 0.0f;
        }

OpenTK.BezierCurveQuadric.BezierCurveQuadric	(	float	parallel,
		Vector2	startAnchor,
		Vector2	endAnchor,
		Vector2	controlPoint
	)

Constructs a new BezierCurveQuadric.

Parameters:

	parallel	The parallel value.
	startAnchor	The start anchor.
	endAnchor	The end anchor.
	controlPoint	The control point.

Definition at line 74 of file BezierCurveQuadric.cs.

        {
            this.Parallel = parallel;
            this.StartAnchor = startAnchor;
            this.EndAnchor = endAnchor;
            this.ControlPoint = controlPoint;
        }

---

Member Function Documentation

float OpenTK.BezierCurveQuadric.CalculateLength

(

float

precision

)

Calculates the length of this bezier curve.

Parameters:

precision

The precision.

Returns:

Length of curve.

The precision gets better when the precision value gets smaller.

Definition at line 134 of file BezierCurveQuadric.cs.

        {
            float length = 0.0f;
            Vector2 old = CalculatePoint(0.0f);

            for (float i = precision; i < (1.0f + precision); i += precision)
            {
                Vector2 n = CalculatePoint(i);
                length += (n - old).Length;
                old = n;
            }

            return length;
        }

Vector2 OpenTK.BezierCurveQuadric.CalculatePoint

(

float

t

)

Calculates the point with the specified t.

Parameters:

t

The t value, between 0.0f and 1.0f.

Returns:

Resulting point.

Definition at line 91 of file BezierCurveQuadric.cs.

        {
            Vector2 r = new Vector2();
            float c = 1.0f - t;

            r.X = (c * c * StartAnchor.X) + (2 * t * c * ControlPoint.X) + (t * t * EndAnchor.X);
            r.Y = (c * c * StartAnchor.Y) + (2 * t * c * ControlPoint.Y) + (t * t * EndAnchor.Y);

            if (Parallel == 0.0f)
                return r;

            Vector2 perpendicular = new Vector2();

            if (t == 0.0f)
                perpendicular = ControlPoint - StartAnchor;
            else
                perpendicular = r - CalculatePointOfDerivative(t);

            return r + Vector2.Normalize(perpendicular).PerpendicularRight * Parallel;
        }

---

Member Data Documentation

Vector2 OpenTK.BezierCurveQuadric.ControlPoint

Control point, controls the direction of both endings of the curve.

Definition at line 38 of file BezierCurveQuadric.cs.

Vector2 OpenTK.BezierCurveQuadric.EndAnchor

End anchor point.

Definition at line 33 of file BezierCurveQuadric.cs.

float OpenTK.BezierCurveQuadric.Parallel

The parallel value.

This value defines whether the curve should be calculated as a parallel curve to the original bezier curve. A value of 0.0f represents the original curve, 5.0f i.e. stands for a curve that has always a distance of 5.f to the orignal curve at any point.

Definition at line 47 of file BezierCurveQuadric.cs.

Vector2 OpenTK.BezierCurveQuadric.StartAnchor

Start anchor point.

Definition at line 28 of file BezierCurveQuadric.cs.