DrawPixels.java

    public static void main(String[] args) {
        int width = 1024;
        int height = 800;
        
        World earth = new World(width, height);
        Turtle t0 = new Turtle(earth);
        Random r = new Random();
        // Draws a random pixel for every pixel on th
        for(int i = 0; i < width*height; i++){
            int x = r.nextInt(width);
            int y = r.nextInt(height);
            Color color = new Color((float)Math.random(), (float) Math.random(), (float) Math.random());

            t0.drawPixel(x, y, color);
        }
    }

    /**
     * Draws a single pixel at the point (x,y) in the world
     * 
     * @param x The x coordinate of the point to draw
     * @param y The y coordinate of the point to draw
     */
    public void drawPixel(int x, int y){
        this.penUp();
        this.moveTo(x, y);
        this.penDown();
        this.moveTo(x, y);
    }

    /**
     * Draws a single pixel at the point (x,y) in the world with a specified color. Does not permanently change the turtle's pen color
     * 
     * @param x The x coordinate of the point to draw
     * @param y The y coordinate of the point to draw
     * @param c The color of the pixel to draw
     */
    public void drawPixel(int x, int y, Color c){
        Color previousColor = c;
        this.setPenColor(c);
        drawPixel(x, y);
        this.setPenColor(previousColor);
    }

DrawTurtle.java

import java.awt.Color;
import java.util.Random;

public class DrawTurtle{
    public static void main(String[] args) {
        Picture p = new Picture(new FileChooser().pickAFile());
        int width = p.getWidth() / 4;
        int height = p.getHeight() / 4;
        
        World earth = new World(width, height);
        Turtle t0 = new Turtle(earth);
        Random r = new Random();
        // Draws a random pixel for every pixel on th
        for(int x = 0; x < width; x++){
            for(int y = 0; y < height; y++){
                Color color = p.getPixel(x*4,y*4).getColor();

                drawPixel(t0, x, y, color);
            }
        }
    }

    /**
     * Draws a single pixel at the point (x,y) in the world
     * 
     * @param x The x coordinate of the point to draw
     * @param y The y coordinate of the point to draw
     */
    public static void drawPixel(Turtle t, int x, int y){
        t.penUp();
        t.moveTo(x, y);
        t.penDown();
        t.moveTo(x, y);
    }

    /**
     * Draws a single pixel at the point (x,y) in the world with a specified color. Does not permanently change the turtle's pen color
     * 
     * @param x The x coordinate of the point to draw
     * @param y The y coordinate of the point to draw
     * @param c The color of the pixel to draw
     */
    public static void drawPixel(Turtle t, int x, int y, Color c){
        Color previousColor = c;
        t.setPenColor(c);
        drawPixel(t, x, y);
        t.setPenColor(previousColor);
    }
}