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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | 52x 52x 52x 43x 5x 43x 41x 41x 41x 41x 55x 55x 55x 55x 2x 53x 53x 1x 52x 52x 52x 52x 1x 131x 52x 1x 1x 1x 1x 43x | import Frozen from "./Frozen.js";
import defined from "./defined.js";
import DeveloperError from "./DeveloperError.js";
import Quaternion from "./Quaternion.js";
import Spline from "./Spline.js";
function createEvaluateFunction(spline) {
const points = spline.points;
const times = spline.times;
// use slerp interpolation
return function (time, result) {
if (!defined(result)) {
result = new Quaternion();
}
const i = (spline._lastTimeIndex = spline.findTimeInterval(
time,
spline._lastTimeIndex,
));
const u = (time - times[i]) / (times[i + 1] - times[i]);
const q0 = points[i];
const q1 = points[i + 1];
return Quaternion.fastSlerp(q0, q1, u, result);
};
}
/**
* A spline that uses spherical linear (slerp) interpolation to create a quaternion curve.
* The generated curve is in the class C<sup>1</sup>.
*
* @alias QuaternionSpline
* @constructor
*
* @param {object} options Object with the following properties:
* @param {number[]} options.times An array of strictly increasing, unit-less, floating-point times at each point.
* The values are in no way connected to the clock time. They are the parameterization for the curve.
* @param {Quaternion[]} options.points The array of {@link Quaternion} control points.
*
* @exception {DeveloperError} points and times are required
* @exception {DeveloperError} points.length must be greater than or equal to 2.
* @exception {DeveloperError} times.length must be equal to points.length.
* @see ConstantSpline
* @see SteppedSpline
* @see HermiteSpline
* @see CatmullRomSpline
* @see LinearSpline
* @see MorphWeightSpline
*/
function QuaternionSpline(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const points = options.points;
const times = options.times;
//>>includeStart('debug', pragmas.debug);
if (!defined(points) || !defined(times)) {
throw new DeveloperError("points and times are required.");
}
Iif (points.length < 2) {
throw new DeveloperError(
"points.length must be greater than or equal to 2.",
);
}
if (times.length !== points.length) {
throw new DeveloperError("times.length must be equal to points.length.");
}
//>>includeEnd('debug');
this._times = times;
this._points = points;
this._evaluateFunction = createEvaluateFunction(this);
this._lastTimeIndex = 0;
}
Object.defineProperties(QuaternionSpline.prototype, {
/**
* An array of times for the control points.
*
* @memberof QuaternionSpline.prototype
*
* @type {number[]}
* @readonly
*/
times: {
get: function () {
return this._times;
},
},
/**
* An array of {@link Quaternion} control points.
*
* @memberof QuaternionSpline.prototype
*
* @type {Quaternion[]}
* @readonly
*/
points: {
get: function () {
return this._points;
},
},
});
/**
* Finds an index <code>i</code> in <code>times</code> such that the parameter
* <code>time</code> is in the interval <code>[times[i], times[i + 1]]</code>.
* @function
*
* @param {number} time The time.
* @returns {number} The index for the element at the start of the interval.
*
* @exception {DeveloperError} time must be in the range <code>[t<sub>0</sub>, t<sub>n</sub>]</code>, where <code>t<sub>0</sub></code>
* is the first element in the array <code>times</code> and <code>t<sub>n</sub></code> is the last element
* in the array <code>times</code>.
*/
QuaternionSpline.prototype.findTimeInterval = Spline.prototype.findTimeInterval;
/**
* Wraps the given time to the period covered by the spline.
* @function
*
* @param {number} time The time.
* @return {number} The time, wrapped around to the updated animation.
*/
QuaternionSpline.prototype.wrapTime = Spline.prototype.wrapTime;
/**
* Clamps the given time to the period covered by the spline.
* @function
*
* @param {number} time The time.
* @return {number} The time, clamped to the animation period.
*/
QuaternionSpline.prototype.clampTime = Spline.prototype.clampTime;
/**
* Evaluates the curve at a given time.
*
* @param {number} time The time at which to evaluate the curve.
* @param {Quaternion} [result] The object onto which to store the result.
* @returns {Quaternion} The modified result parameter or a new instance of the point on the curve at the given time.
*
* @exception {DeveloperError} time must be in the range <code>[t<sub>0</sub>, t<sub>n</sub>]</code>, where <code>t<sub>0</sub></code>
* is the first element in the array <code>times</code> and <code>t<sub>n</sub></code> is the last element
* in the array <code>times</code>.
*/
QuaternionSpline.prototype.evaluate = function (time, result) {
return this._evaluateFunction(time, result);
};
export default QuaternionSpline;
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