C, calculation code of parameter points of two-dimensional Bezier curve

Bézier The algorithm is used for curve fitting and interpolation .

Interpolation is the numerical value calculated by a function or group of functions Completely through Given point .

Fitting is the numerical value calculated by a function or group of functions Try to pass Given point .

Here is given A two-dimensional Bézier Parameter point calculation code of curve fitting .

Different from another pronunciation close to Bessel interpolation algorithm （Bessel's interpolation） Ha ！ Germany , The French .

class Point
{
    double X;
    double Y;
}

public Point GetBezierPoint(double t, Point p0, Point p1, Point p2, Point
p3)
{
    double cx = 3 * (p1.X - p0.X);
    double bx = 3 * (p2.X - p1.X) - cx;
    double ax = p3.X - p0.X - cx - bx;
    double cy = 3 * (p1.Y - p0.Y);
    double by = 3 * (p2.Y - p1.Y) - cy;
    double ay = p3.Y - p0.Y - cy - by;
    double tCubed = t * t * t;
    double tSquared = t * t;
    double resultX = (ax * tCubed) + (bx * tSquared) + (cx * t) + p0.X;
    double resultY = (ay * tCubed) + (by * tSquared) + (cy * t) + p0.Y;
    return new Point((int)resultX, (int)resultY);
}

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