OpenTK.BezierCurveCubic Struct Reference

Represents a cubic bezier curve with two anchor and two control points. More...

List of all members.

Public Member Functions
	BezierCurveCubic (Vector2 startAnchor, Vector2 endAnchor, Vector2 firstControlPoint, Vector2 secondControlPoint)
	Constructs a new BezierCurveCubic.
	BezierCurveCubic (float parallel, Vector2 startAnchor, Vector2 endAnchor, Vector2 firstControlPoint, Vector2 secondControlPoint)
	Constructs a new BezierCurveCubic.
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	FirstControlPoint
	First control point, controls the direction of the curve start.
Vector2	SecondControlPoint
	Second control point, controls the direction of the curve end.
float	Parallel
	Gets or sets the parallel value.

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Detailed Description

Represents a cubic bezier curve with two anchor and two control points.

Definition at line 21 of file BezierCurveCubic.cs.

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Constructor & Destructor Documentation

OpenTK.BezierCurveCubic.BezierCurveCubic	(	Vector2	startAnchor,
		Vector2	endAnchor,
		Vector2	firstControlPoint,
		Vector2	secondControlPoint
	)

Constructs a new BezierCurveCubic.

Parameters:

	startAnchor	The start anchor point.
	endAnchor	The end anchor point.
	firstControlPoint	The first control point.
	secondControlPoint	The second control point.

Definition at line 65 of file BezierCurveCubic.cs.

        {
            this.StartAnchor = startAnchor;
            this.EndAnchor = endAnchor;
            this.FirstControlPoint = firstControlPoint;
            this.SecondControlPoint = secondControlPoint;
            this.Parallel = 0.0f;
        }

OpenTK.BezierCurveCubic.BezierCurveCubic	(	float	parallel,
		Vector2	startAnchor,
		Vector2	endAnchor,
		Vector2	firstControlPoint,
		Vector2	secondControlPoint
	)

Constructs a new BezierCurveCubic.

Parameters:

	parallel	The parallel value.
	startAnchor	The start anchor point.
	endAnchor	The end anchor point.
	firstControlPoint	The first control point.
	secondControlPoint	The second control point.

Definition at line 82 of file BezierCurveCubic.cs.

        {
            this.Parallel = parallel;
            this.StartAnchor = startAnchor;
            this.EndAnchor = endAnchor;
            this.FirstControlPoint = firstControlPoint;
            this.SecondControlPoint = secondControlPoint;
        }

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Member Function Documentation

float OpenTK.BezierCurveCubic.CalculateLength

(

float

precision

)

Calculates the length of this bezier curve.

Parameters:

precision

The precision.

Returns:

Length of the curve.

The precision gets better when the precision value gets smaller.

Definition at line 146 of file BezierCurveCubic.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.BezierCurveCubic.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 100 of file BezierCurveCubic.cs.

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

            r.X = (StartAnchor.X * c * c * c) + (FirstControlPoint.X * 3 * t * c * c) + (SecondControlPoint.X * 3 * t * t * c)
                + EndAnchor.X * t * t * t;
            r.Y = (StartAnchor.Y * c * c * c) + (FirstControlPoint.Y * 3 * t * c * c) + (SecondControlPoint.Y * 3 * t * t * c)
                + EndAnchor.Y * t * t * t;

            if (Parallel == 0.0f)
                return r;

            Vector2 perpendicular = new Vector2();

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

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

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Member Data Documentation

Vector2 OpenTK.BezierCurveCubic.EndAnchor

End anchor point.

Definition at line 33 of file BezierCurveCubic.cs.

Vector2 OpenTK.BezierCurveCubic.FirstControlPoint

First control point, controls the direction of the curve start.

Definition at line 38 of file BezierCurveCubic.cs.

float OpenTK.BezierCurveCubic.Parallel

Gets or sets 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 52 of file BezierCurveCubic.cs.

Vector2 OpenTK.BezierCurveCubic.SecondControlPoint

Second control point, controls the direction of the curve end.

Definition at line 43 of file BezierCurveCubic.cs.

Vector2 OpenTK.BezierCurveCubic.StartAnchor

Start anchor point.

Definition at line 28 of file BezierCurveCubic.cs.