package com.pau101.util;

/**
 * @author Paul Fulham (pau101)
 */
public class CubicBezier
{
    private float[][] controlPoints;
    
    public CubicBezier(float a1, float b1, float a2, float b2)
    {
        controlPoints = new float[4][];
        controlPoints[0] = new float[]{0, 0};
        controlPoints[1] = new float[]{a1, b1};
        controlPoints[2] = new float[]{a2, b2};
        controlPoints[3] = new float[]{1, 1};
    }
    
    public float eval(float t)
    {
        float[] scalars = new float[4];
        BezierUtils.allBernstein(3, t, scalars);
        float p = 0;
        for(int i = 0; i < 4; i++)
            p += scalars[i] * controlPoints[i][1];
        return p;
    }
}