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https://github.com/photonstorm/phaser
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25 lines
717 B
JavaScript
25 lines
717 B
JavaScript
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var GetAngle = require('./GetAngle');
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var FindT = require('./FindT');
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/**
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* Calculate and return the angle, in radians, of the curves tangent at the given pixel distance along the curves length.
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*
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* @param {number} [distance=0] - The distance along the curve to get the angle from, in pixels.
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* @return {number} The angle of the line at the specified distance along the curve. The value is in radians.
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*/
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var GetAngleWithDistance = function (curve, distance)
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{
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if (distance === undefined) { distance = 0; }
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if (distance <= 0)
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{
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return Math.atan2(this._v1y, this._v1x);
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}
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else
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{
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return GetAngle(curve, FindT(curve, distance));
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}
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};
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module.exports = GetAngleWithDistance;
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