Function binarySubdivide

src/bezier.js:29–41

(aX, aA, aB, mX1, mX2)

 function getSlope (aT, aA1, aA2) { return 3.0 * A(aA1, aA2) * aT * aT + 2.0 * B(aA1, aA2) * aT + C(aA1); }

 function binarySubdivide (aX, aA, aB, mX1, mX2) {
   var currentX, currentT, i = 0;
   do {
     currentT = aA + (aB - aA) / 2.0;
     currentX = calcBezier(currentT, mX1, mX2) - aX;
     if (currentX > 0.0) {
       aB = currentT;
     } else {
       aA = currentT;
     }
   } while (Math.abs(currentX) > SUBDIVISION_PRECISION && ++i < SUBDIVISION_MAX_ITERATIONS);
   return currentT;
 }

 function newtonRaphsonIterate (aX, aGuessT, mX1, mX2) {
  for (var i = 0; i < NEWTON_ITERATIONS; ++i) {