package wordcram;

import processing.core.PApplet;
import processing.core.PVector;

public class SpiralWordNudger implements WordNudger {

    // Who knows? this seems to be good, but it seems to depend on the font --
    // bigger fonts need a bigger thetaIncrement.
    private float thetaIncrement = (float) (Math.PI * 0.03);

    @Override
    public PVector nudgeFor(Word w, int attempt) {
        float rad = powerMap(0.6f, attempt, 0, 600, 1, 100);

        thetaIncrement = powerMap(1, attempt, 0, 600, 0.5f, 0.3f);
        float theta = thetaIncrement * attempt;
        float x = PApplet.cos(theta) * rad;
        float y = PApplet.sin(theta) * rad;
        return new PVector(x, y);
    }

    private float powerMap(float power, float v, float min1, float max1,
            float min2, float max2) {

        float val = PApplet.norm(v, min1, max1);
        val = PApplet.pow(val, power);
        return PApplet.lerp(min2, max2, val);
    }

}