/*
 * Copyright (c) 2015 Camil Staps
 */
package com.camilstaps.mandelbrot;

import fractals.Grid;
import fractals.Mandelbrot;

/**
 *
 * @author camilstaps
 */
public class MandelbrotController {
    
    private final MandelbrotProvider mandelbrotProvider;
    private final Grid grid;
    
    public MandelbrotController(MandelbrotProvider mp, Grid grid) {
        mandelbrotProvider = mp;
        this.grid = grid;
    }
    
    public void redraw() {
        double centerX = mandelbrotProvider.getCenterX();
        double centerY = mandelbrotProvider.getCenterY();
        double scale = mandelbrotProvider.getScale();
        int repetitions = mandelbrotProvider.getRepetitions();
        
        int grid_w = grid.getWidth(), grid_h = grid.getHeight();
        
        double min_x = centerX - grid_w / scale / 2,
                max_x = centerX + grid_w / scale / 2,
                min_y = centerY - grid_h / scale / 2,
                max_y = centerX + grid_h / scale / 2;
        
        for (float i = 0; i < grid_w; i++) {
            for (float j = 0; j < grid_h; j++) {
                int grayscale = Mandelbrot.mandelNumber(
                        min_x + (i / grid_w) * (max_x - min_x), 
                        min_y + (j / grid_h) * (max_y - min_y),
                        repetitions
                ) * 255 / repetitions;
                int[] color = {grayscale, grayscale, grayscale};
                grid.setPixel((int) i, (int) j, color);
            }               
        }
    }
    
    public interface MandelbrotProvider {
        public double getCenterX();
        public double getCenterY();
        public double getScale();
        public int getRepetitions();
    }
    
}