/* * A program to paint, centered on the canvas, a circle of randomly colored, hirst dots with spaces of specific colors. Black if none chosen */ package npw; import painter.SPainter; import shapes.SCircle; import javax.swing.*; import java.awt.*; import java.util.Random; import java.util.Scanner; public class SimpleDots { private void paintTheImage(){ // Get the input information int radius = getNumber("circle radius"); int dotRadius = getNumber("dot radius"); Color userColor = getColor("Please type a color that is either red, blue, or green"); // Establish the painter SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50); painter.setBrushWidth(3); SCircle circle = new SCircle(radius); SCircle dot = new SCircle(dotRadius); // Paint the dots paintCircleOfdots(painter, circle, dot, userColor); } private void paintCircleOfdots(SPainter painter, SCircle circle, SCircle dot, Color userColor){ // Position the painter to begin drawing the rows painter.mfd(circle.radius()); painter.tr(); // Paint the circle of dots double moved = 0; while (moved < circle.diameter()) { double chord = chordLength(circle.radius() - moved, circle); int dots = dotsOnLineCount(chord, dot.diameter()); paintRow(painter, dot, dots, userColor); nextRow(painter, dot.diameter()); moved = moved + dot.diameter(); } // Make the method invariant with respect to painter position painter.tl(); painter.mfd(circle.radius()); } // Move to the next row private void nextRow(SPainter painter, double rowHeight){ painter.tr(); painter.mfd(rowHeight); painter.tl(); } // Assumes the painter is at the center of the row to paint, facing right. private void paintRow(SPainter painter, SCircle dot, int dotsToPaint, Color userColor){ // Move backward 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 the row of dots. int painted = 0; while (painted < dotsToPaint){ paintOneDot(painter, dot, userColor); painter.mfd(dot.diameter()); painted = painted + 1; } // Make the method invariant with respect to painter position. painter.mbk(centerOffset + dot.diameter()); } private void paintOneDot(SPainter painter, SCircle dot, Color userColor){ dot.s2(); //shrink twice to get size appropriate painter.setColor(userColor); painter.paint(dot); dot.x2(); } private static int dotsOnLineCount(double lineLength, double diameter){ int dots = ( (int)Math.ceil( ( lineLength - diameter ) / diameter ) + 1); return dots; } private double chordLength(double yOffset, SCircle circle){ double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 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(); } private Color getColor(String prompt) { String nss = JOptionPane.showInputDialog(null, prompt+":"); Scanner scanner = new Scanner(nss); String color = scanner.next(); if (color.equalsIgnoreCase("red")) { return Color.red; } else if (color.equalsIgnoreCase("blue")) { return Color.blue; } else if (color.equalsIgnoreCase("green")) { return Color.green; } else { return Color.black; } } private static Color randomColor() { Random rgen = new Random(); int r = rgen.nextInt(256); int g = rgen.nextInt(256); int b = rgen.nextInt(256); return new Color(r,g,b); } public SimpleDots() { paintTheImage(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new SimpleDots(); } }); } }