import { Transform } from "../transforms";
import * as p from "../../core/properties";
export class Scale extends Transform {
    constructor(attrs) {
        super(attrs);
    }
    static init_Scale() {
        this.internal({
            source_range: [p.Any],
            target_range: [p.Any],
        });
    }
    r_compute(x0, x1) {
        if (this.target_range.is_reversed)
            return [this.compute(x1), this.compute(x0)];
        else
            return [this.compute(x0), this.compute(x1)];
    }
    r_invert(sx0, sx1) {
        if (this.target_range.is_reversed)
            return [this.invert(sx1), this.invert(sx0)];
        else
            return [this.invert(sx0), this.invert(sx1)];
    }
    // These are needed by both LinearScale and CategoricalScale and this is the
    // only common ancestor. TODO: Proper MI/Mixin would be better.
    _linear_compute(x) {
        const [factor, offset] = this._linear_compute_state();
        return factor * x + offset;
    }
    _linear_v_compute(xs) {
        const [factor, offset] = this._linear_compute_state();
        const result = new Float64Array(xs.length);
        for (let i = 0; i < xs.length; i++)
            result[i] = factor * xs[i] + offset;
        return result;
    }
    _linear_invert(xprime) {
        const [factor, offset] = this._linear_compute_state();
        return (xprime - offset) / factor;
    }
    _linear_v_invert(xprimes) {
        const [factor, offset] = this._linear_compute_state();
        const result = new Float64Array(xprimes.length);
        for (let i = 0; i < xprimes.length; i++)
            result[i] = (xprimes[i] - offset) / factor;
        return result;
    }
    /*protected*/ _linear_compute_state() {
        //
        //  (t1 - t0)       (t1 - t0)
        //  --------- * x - --------- * s0 + t0
        //  (s1 - s0)       (s1 - s0)
        //
        // [  factor  ]     [    offset    ]
        //
        const source_start = this.source_range.start;
        const source_end = this.source_range.end;
        const target_start = this.target_range.start;
        const target_end = this.target_range.end;
        const factor = (target_end - target_start) / (source_end - source_start);
        const offset = -(factor * source_start) + target_start;
        return [factor, offset];
    }
}
Scale.__name__ = "Scale";
Scale.init_Scale();
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