Пример #1
0
        /**
         *  Calculates a Bezier interpolated path for the given points.
         */
        public void Interpolate(Point3DList segmentPoints, double scale)
        {
            controlPoints.Clear();

            if (segmentPoints.Count < 2)
            {
                return;
            }

            for (int i = 0; i < segmentPoints.Count; i++)
            {
                if (i == 0) // is first
                {
                    Point3D p1 = segmentPoints[i];
                    Point3D p2 = segmentPoints[i + 1];

                    controlPoints.Add(p1);
                    controlPoints.Add(Point3DList.Interpolate(p1, p2, scale));
                }
                else if (i == segmentPoints.Count - 1) //last
                {
                    Point3D p0 = segmentPoints[i - 1];
                    Point3D p1 = segmentPoints[i];

                    controlPoints.Add(Point3DList.Interpolate(p0, p1, scale));
                    controlPoints.Add(p1);
                }
                else
                {
                    Point3D  p0 = segmentPoints[i - 1];
                    Point3D  p1 = segmentPoints[i];
                    Point3D  p2 = segmentPoints[i + 1];
                    Vector3d tp = (p2.Position - p0.Position).Normalized();

                    Vector3d pos0 = p1.Position - scale * tp * (p1.Position - p0.Position).Length;
                    Vector3d pos1 = p1.Position + scale * tp * (p2.Position - p1.Position).Length;


                    Vector3d tn    = (p2.Normal - p0.Normal).Normalized();
                    Vector3d norm0 = p1.Normal - scale * tn * (p1.Normal - p0.Normal).Length;
                    Vector3d norm1 = p1.Normal + scale * tn * (p2.Normal - p1.Normal).Length;



                    controlPoints.Add(new Point3D(pos0, norm0, p0.Color.GetStepColor(p1.Color, scale)));
                    controlPoints.Add(p1);
                    controlPoints.Add(new Point3D(pos1, norm1, p1.Color.GetStepColor(p2.Color, scale)));
                }
            }

            curveCount = (controlPoints.Count - 1) / 3;
        }
Пример #2
0
        /**
         *  Sample the given points as a Bezier path.
         */
        public void SamplePoints(Point3DList sourcePoints, double minSqrDistance, double maxSqrDistance, double scale)
        {
            if (sourcePoints.Count < 2)
            {
                return;
            }

            Stack <Point3D> samplePoints = new Stack <Point3D>();

            samplePoints.Push(sourcePoints[0]);

            Point3D potentialSamplePoint = sourcePoints[1];

            int i = 2;

            for (i = 2; i < sourcePoints.Count; i++)
            {
                if (
                    ((potentialSamplePoint.Position - sourcePoints[i].Position).LengthSquared > minSqrDistance) &&
                    ((samplePoints.Peek().Position - sourcePoints[i].Position).LengthSquared > maxSqrDistance))
                {
                    samplePoints.Push(potentialSamplePoint);
                }

                potentialSamplePoint = sourcePoints[i];
            }

            //now handle last bit of curve
            Point3D p1 = samplePoints.Pop();  //last sample point
            Point3D p0 = samplePoints.Peek(); //second last sample point


            Vector3d posT      = (p0.Position - potentialSamplePoint.Position).Normalized();
            double   pos_d2    = (potentialSamplePoint.Position - p1.Position).Length;
            double   pos_d1    = (p1.Position - p0.Position).Length;
            double   pos_scale = ((pos_d1 - pos_d2) / 2f);
            Vector3d pos_      = p1.Position + posT * pos_scale;

            Vector3d normT   = (p0.Normal - potentialSamplePoint.Normal).Normalized();
            double   norm_d2 = (potentialSamplePoint.Normal - p1.Normal).Length;
            double   norm_d1 = (p1.Normal - p0.Normal).Length;
            Vector3d norm_   = p1.Normal + normT * ((norm_d1 - norm_d2) / 2);


            samplePoints.Push(new Point3D(pos_, norm_, p1.Color.GetStepColor(p0.Color, pos_scale)));
            samplePoints.Push(potentialSamplePoint);
            Point3DList l = new Point3DList(samplePoints.Count);

            l.AddRange(samplePoints);
            Interpolate(l, scale);
        }
Пример #3
0
        Point3DList FindDrawingPoints(int curveIndex)
        {
            Point3DList pointList = new Point3DList();

            Point3D left  = CalculateBezierPoint(curveIndex, 0);
            Point3D right = CalculateBezierPoint(curveIndex, 1);

            pointList.Add(left);
            pointList.Add(right);

            FindDrawingPoints(curveIndex, 0, 1, pointList, 1);

            return(pointList);
        }
Пример #4
0
        /**
         *  This gets the drawing points of a bezier curve, using recursive division,
         *  which results in less points for the same accuracy as the above implementation.
         */
        public Point3DList GetDrawingPoints2()
        {
            Point3DList drawingPoints = new Point3DList();

            for (int curveIndex = 0; curveIndex < curveCount; curveIndex++)
            {
                Point3DList bezierCurveDrawingPoints = FindDrawingPoints(curveIndex);

                if (curveIndex != 0)
                {
                    //remove the fist point, as it coincides with the last point of the previous Bezier curve.
                    bezierCurveDrawingPoints.RemoveAt(0);
                }

                drawingPoints.AddRange(bezierCurveDrawingPoints);
            }

            return(drawingPoints);
        }
Пример #5
0
        /// <summary>
        /// Get a interpolated list of this list composed od "count" point based on the Y position of another list of points
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        public Point3DList GetYInterpolated(Point3DList reflist)
        {
            int         count = reflist.Count;
            Point3DList ret   = new Point3DList(count);

            if (count == 0)
            {
                return(ret);
            }

            for (int i = 0; i < count; i++)
            {
                double  y = reflist[i].Position.Y;
                Point3D p = GetInterpolateByY(reflist[i].Position.Y, i == 0);

                ret.Add(p);
            }

            return(ret);
        }
Пример #6
0
        /**
         *  Gets the drawing points. This implementation simply calculates a certain number
         *  of points per curve.
         */
        public Point3DList GetDrawingPoints0()
        {
            Point3DList drawingPoints = new Point3DList();

            for (int curveIndex = 0; curveIndex < curveCount; curveIndex++)
            {
                if (curveIndex == 0) //Only do this for the first end point.
                //When i != 0, this coincides with the
                //end point of the previous segment,
                {
                    drawingPoints.Add(CalculateBezierPoint(curveIndex, 0));
                }

                for (int j = 1; j <= SEGMENTS_PER_CURVE; j++)
                {
                    double t = j / (double)SEGMENTS_PER_CURVE;
                    drawingPoints.Add(CalculateBezierPoint(curveIndex, t));
                }
            }

            return(drawingPoints);
        }
Пример #7
0
        /// <summary>
        /// Get a interpolated list of this list composed od "count" point
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        public Point3DList GetInterpolatedList(int count)
        {
            Point3DList ret = new Point3DList(count);

            if (count == 0)
            {
                return(ret);
            }
            else if (count == Count)
            {
                ret.AddRange(this);
            }
            else
            {
                double max = Max.Y;
                double d   = (max - Min.Y) / count;
                for (int i = 0; i < count; i++)
                {
                    Point3D p = GetInterpolateByY(max - i * d, i == 0);
                    ret.Add(p);
                }
            }
            return(ret);
        }
Пример #8
0
 /**
  *  Sets the control points of this Bezier path.
  *  Points 0-3 forms the first Bezier curve, points
  *  3-6 forms the second curve, etc.
  */
 public void SetControlPoints(Point3DList newControlPoints)
 {
     controlPoints.Clear();
     controlPoints.AddRange(newControlPoints);
     curveCount = (controlPoints.Count - 1) / 3;
 }
Пример #9
0
        private int curveCount; //how many bezier curves in this path?

        /**
         *  Constructs a new empty Bezier curve. Use one of these methods
         *  to add points: SetControlPoints, Interpolate, SamplePoints.
         */
        public BezierBuilder(int segmentPerCurve = 10, double minSquareDistance = 0.01f)
        {
            controlPoints        = new Point3DList();
            SEGMENTS_PER_CURVE   = segmentPerCurve;
            MINIMUM_SQR_DISTANCE = minSquareDistance;
        }