/* 
 * A program to create a circle comprised of dots of a single color, size and color determined by dialog box. 
 */

package npw;

import painter.SPainter;
import shapes.SCircle;

import javax.swing.*;
import java.awt.*;
import java.util.Scanner;

public class SimpleDots {

    private void paintTheImage() {
        // input info
        int radius = getNumber("circle radius");
        int radiusB = getNumber("dot radius");
        String color = getColor("change color?");

        SPainter painter = new SPainter("Simple Dots", radius * 2 + 50, radius * 2 + 50);
        painter.setBrushWidth(3);
        SCircle circle = new SCircle(radius);
        SCircle dot = new SCircle(radiusB);

        if (color == null) {
            color = "exit";
        } // user clicked on Cancel
        if (color.equalsIgnoreCase("blue")) {
            painter.setColor(Color.BLUE);
        } else if (color.equalsIgnoreCase("red")) {
            painter.setColor(Color.RED);
        } else if (color.equalsIgnoreCase("green")) {
            painter.setColor(Color.GREEN);
        } else {
            painter.setColor(Color.BLACK);
        }

        paintSimpleDots(painter, circle, dot);
    }

    private String getColor(String color) {
        String nss = JOptionPane.showInputDialog(null,color+"?");
        Scanner scanner = new Scanner(nss);
        return scanner.nextLine();
    }

    private void paintSimpleDots(SPainter painter, SCircle circle, SCircle dot){
        //position painter
        painter.mfd(circle.radius());
        painter.tr();
        double moved = 0;
        while (moved < circle.diameter()) {
            double chord = chordLength(circle.radius()-moved, circle);
            int dots = dotsOnLineCount(chord, dot.diameter());
            paintRow(painter, dot, dots);
            nextRow(painter, dot.diameter());
            moved = moved + dot.diameter();
        }
        //make invariant to painter position
        painter.tl();
        painter.mfd(circle.radius());
    }
    private void nextRow(SPainter painter, double rowHeight){
        painter.tr();
        painter.mfd(rowHeight);
        painter.tl();
    }
    //painter is at the center of the row to paint, facing right
    private void paintRow(SPainter painter, SCircle dot, int dotsToPaint) {
        //move back 1/2 of the length we're painting to get ready to paint the row
        double centerOffset = ((dotsToPaint * dot.diameter()) /2) - dot.diameter() /2;
        painter.mbk(centerOffset);

        //paint rows
        int painted = 0;
        while (painted < dotsToPaint) {
            paintOneDot(painter, dot);
            painter.mfd(dot.diameter());
            painted = painted + 1;
        }

        //method invariant to painter position
        painter.mbk(centerOffset + dot.diameter());
    }
    private void paintOneDot(SPainter painter, SCircle dot){
        dot.s2();
        painter.paint(dot);
        dot.x2();
    }

    private static int dotsOnLineCount(double lineLength, double sideLength){
        int dots = ( (int)Math.ceil( ( lineLength - sideLength) / sideLength) + 1);
        return dots;
    }

    private double chordLength(double yOffest, SCircle circle){
        double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffest, 2));
        double chordLength = xLength * 2;
        return chordLength;
    }
    private static int getNumber(String prompt) {
        String nss = JOptionPane.showInputDialog(null,prompt+"?");
        Scanner scanner = new Scanner(nss);
        return scanner.nextInt();
    }

    public SimpleDots() {
        paintTheImage();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new SimpleDots();
            }
        });
    }

}