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A small console animation library

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package me.legrange.console;

import static java.lang.Math.floor;
import static java.lang.Math.round;

final class ProgressBar extends Animator  {

    private final int size;
    private final BarStyle style;
    private final double base;

     ProgressBar(int size, BarStyle style) {
        this.size = size;
        this.style = style;
        base = 1D/style.chars().length;
    }

    @Override
    public String draw(N min, N max, N value) {
        return generateProgressBar(value.doubleValue(), min.doubleValue(), max.doubleValue(), size);
    }

    private  String generateProgressBar(double value, double vmin, double vmax, int length) {
        // normalize value
        value = Math.min(Math.max(value, vmin), vmax);
        value = (value - vmin) / (vmax - vmin);

        double v = value * length;
        int x = (int) floor(v); // integer part
        double y = v - x;       // fractional part
        // round(base*math.floor(float(y)/base),prec)/base
        int i = (int) ((round((base * floor(y / base)) * 1000D) / base) / 1000D);
        String bar = style.chars()[style.chars().length-1].repeat(x) + style.chars()[i];
        int n = length - bar.length();
        return bar + style.chars()[0].repeat(n);
    }
}