Function curveInit

examples/js/processing.js:7805–7836

()

    //internal curveInit
    //used by curveDetail, curveTightness
    var curveInit = function() {
      // allocate only if/when used to save startup time
      if (!curveDrawMatrix) {
        curveBasisMatrix = new PMatrix3D();
        curveDrawMatrix = new PMatrix3D();
        curveInited = true;
      }

      var s = curTightness;
      curveBasisMatrix.set(((s - 1) / 2).toFixed(2), ((s + 3) / 2).toFixed(2),
                           ((-3 - s) / 2).toFixed(2), ((1 - s) / 2).toFixed(2),
                           (1 - s), ((-5 - s) / 2).toFixed(2), (s + 2), ((s - 1) / 2).toFixed(2),
                           ((s - 1) / 2).toFixed(2), 0, ((1 - s) / 2).toFixed(2), 0, 0, 1, 0, 0);

      splineForward(curveDet, curveDrawMatrix);

      if (!bezierBasisInverse) {
        //bezierBasisInverse = bezierBasisMatrix.get();
        //bezierBasisInverse.invert();
        curveToBezierMatrix = new PMatrix3D();
      }

      // TODO only needed for PGraphicsJava2D? if so, move it there
      // actually, it's generally useful for other renderers, so keep it
      // or hide the implementation elsewhere.
      curveToBezierMatrix.set(curveBasisMatrix);
      curveToBezierMatrix.preApply(bezierBasisInverse);

      // multiply the basis and forward diff matrices together
      // saves much time since this needn't be done for each curve
      curveDrawMatrix.apply(curveBasisMatrix);
    };

    p.bezierVertex = function bezierVertex() {
      isBezier = true;