mirror of
https://github.com/photonstorm/phaser
synced 2024-11-30 16:39:34 +00:00
24 lines
717 B
JavaScript
24 lines
717 B
JavaScript
var GetAngle = require('./GetAngle');
|
|
var FindT = require('./FindT');
|
|
|
|
/**
|
|
* Calculate and return the angle, in radians, of the curves tangent at the given pixel distance along the curves length.
|
|
*
|
|
* @param {number} [distance=0] - The distance along the curve to get the angle from, in pixels.
|
|
* @return {number} The angle of the line at the specified distance along the curve. The value is in radians.
|
|
*/
|
|
var GetAngleWithDistance = function (curve, distance)
|
|
{
|
|
if (distance === undefined) { distance = 0; }
|
|
|
|
if (distance <= 0)
|
|
{
|
|
return Math.atan2(this._v1y, this._v1x);
|
|
}
|
|
else
|
|
{
|
|
return GetAngle(curve, FindT(curve, distance));
|
|
}
|
|
};
|
|
|
|
module.exports = GetAngleWithDistance;
|