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import type {Point, SplinePoint} from '../types/geometric.js';
/**
* @private
*/
export function _pointInLine(p1: Point, p2: Point, t: number, mode?) { // eslint-disable-line @typescript-eslint/no-unused-vars
return {
x: p1.x + t * (p2.x - p1.x),
y: p1.y + t * (p2.y - p1.y)
};
}
/**
* @private
*/
export function _steppedInterpolation(
p1: Point,
p2: Point,
t: number, mode: 'middle' | 'after' | unknown
) {
return {
x: p1.x + t * (p2.x - p1.x),
y: mode === 'middle' ? t < 0.5 ? p1.y : p2.y
: mode === 'after' ? t < 1 ? p1.y : p2.y
: t > 0 ? p2.y : p1.y
};
}
/**
* @private
*/
export function _bezierInterpolation(p1: SplinePoint, p2: SplinePoint, t: number, mode?) { // eslint-disable-line @typescript-eslint/no-unused-vars
const cp1 = {x: p1.cp2x, y: p1.cp2y};
const cp2 = {x: p2.cp1x, y: p2.cp1y};
const a = _pointInLine(p1, cp1, t);
const b = _pointInLine(cp1, cp2, t);
const c = _pointInLine(cp2, p2, t);
const d = _pointInLine(a, b, t);
const e = _pointInLine(b, c, t);
return _pointInLine(d, e, t);
}
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