Method curveTangent

core/src/processing/core/PGraphics.java:3481–3493

( begin auto-generated from curveTangent.xml ) Calculates the tangent of a point on a curve. There's a good definition of tangent on Wikipedia . ( end auto-generated ) Advanced Code thanks to Dave Bollinger (Bug #715

(float a, float b, float c, float d, float t)

   * @see PGraphics#bezierTangent(float, float, float, float, float)
   */
  public float curveTangent(float a, float b, float c, float d, float t) {
    curveInitCheck();

    float tt3 = t * t * 3;
    float t2 = t * 2;
    PMatrix3D cb = curveBasisMatrix;

    // not optimized (and probably need not be)
    return (a * (tt3*cb.m00 + t2*cb.m10 + cb.m20) +
            b * (tt3*cb.m01 + t2*cb.m11 + cb.m21) +
            c * (tt3*cb.m02 + t2*cb.m12 + cb.m22) +
            d * (tt3*cb.m03 + t2*cb.m13 + cb.m23) );
  }


  /**