在我的另一个问题中，我已经获得了一些帮助，以使我走到这一步，但是我想知道如何使我的方块彼此靠后而不是彼此靠前。下面的代码是到目前为止我得到的。
这是将它们递归放置的代码：
import java.awt.image.*;
import java.awt.Color;
import java.io.*;
import javax.imageio.*;
import java.util.*;
public class FractalDriver {
static final int SIDE = 1000; // image is SIDE X SIDE
static BufferedImage image = new BufferedImage(SIDE, SIDE, BufferedImage.TYPE_INT_RGB);
static final int WHITE = Color.WHITE.getRGB();
static final int BLACK = Color.BLACK.getRGB();
static Scanner kbd = new Scanner(System.in);
public static void main(String[] args) throws IOException {
String fileOut = "helloSquares.png";
// make image black
for (int i = 0; i < SIDE; i++) {
for (int j = 0; j < SIDE; j++) {
image.setRGB(i, j, BLACK);
}
}
Square square = new Square(SIDE / 2, SIDE / 2, SIDE / 2, WHITE);
drawSquare(square);
// save image
File outputfile = new File(fileOut);
ImageIO.write(image, "jpg", outputfile);
}
public static void drawSquare(Square square) { // center of square is x,y length of side is s
if (square.side <= 0) { // base case
return;
} else {
// determine corners
int left = square.center_x - (square.side / 2);
int top = square.center_y - (square.side / 2);
int right = square.center_x + (square.side / 2);
int bottom = square.center_y + (square.side / 2);
int newColor = square.color - 100000;
Square newSquareA = new Square(left, top, square.side / 2, newColor);
Square newSquareB = new Square(left, bottom, square.side / 2, newColor);
Square newSquareC = new Square(right, top, square.side / 2, newColor);
Square newSquareD = new Square(right, bottom, square.side / 2, newColor);
// recursively paint squares at the corners
drawSquare(newSquareA);
drawSquare(newSquareB);
drawSquare(newSquareC);
drawSquare(newSquareD);
//placing the for loop here starts at the end and moves toward the beginning
//it appears in the png that the squares are behind eachother
for (int i = left; i < right; i++) {
for (int j = top; j < bottom; j++) {
image.setRGB(i, j, square.color);
}
}
}
}
}
这是将它们打印在彼此之上的代码：
import java.awt.image.*;
import java.awt.Color;
import java.io.*;
import javax.imageio.*;
import java.util.*;
public class FractalDriver {
static final int SIDE = 1000; // image is SIDE X SIDE
static BufferedImage image = new BufferedImage(SIDE, SIDE, BufferedImage.TYPE_INT_RGB);
static final int WHITE = Color.WHITE.getRGB();
static final int BLACK = Color.BLACK.getRGB();
static Scanner kbd = new Scanner(System.in);
public static void main(String[] args) throws IOException {
String fileOut = "helloSquares.png";
// make image black
for (int i = 0; i < SIDE; i++) {
for (int j = 0; j < SIDE; j++) {
image.setRGB(i, j, BLACK);
}
}
Square square = new Square(SIDE / 2, SIDE / 2, SIDE / 2, WHITE);
drawSquare(square);
// save image
File outputfile = new File(fileOut);
ImageIO.write(image, "jpg", outputfile);
}
public static void drawSquare(Square square) { // center of square is x,y length of side is s
if (square.side <= 0) { // base case
return;
} else {
// determine corners
int left = square.center_x - (square.side / 2);
int top = square.center_y - (square.side / 2);
int right = square.center_x + (square.side / 2);
int bottom = square.center_y + (square.side / 2);
int newColor = square.color - 100000;
Square newSquareA = new Square(left, top, square.side / 2, newColor);
Square newSquareB = new Square(left, bottom, square.side / 2, newColor);
Square newSquareC = new Square(right, top, square.side / 2, newColor);
Square newSquareD = new Square(right, bottom, square.side / 2, newColor);
for (int i = left; i < right; i++) {
for (int j = top; j < bottom; j++) {
image.setRGB(i, j, square.color);
}
}
// recursively paint squares at the corners
drawSquare(newSquareA);
drawSquare(newSquareB);
drawSquare(newSquareC);
drawSquare(newSquareD);
//placing the for loop here starts at the end and moves toward the beginning
//it appears in the png that the squares are behind eachother
}
}
}
这里唯一的区别是for循环的位置（一个在递归调用之前，一个在递归调用之后）
这里是相同的程序，但没有递归：
import java.awt.image.*;
import java.awt.Color;
import java.io.*;
import javax.imageio.*;
import java.util.*;
public class TSquare {
static final int SIDE = 1000; // image is SIDE X SIDE
static final int WHITE = Color.WHITE.getRGB();
static final int BLACK = Color.BLACK.getRGB();
static Scanner kbd = new Scanner(System.in);
public static void main(String[] args) throws IOException{
BufferedImage image = new BufferedImage(SIDE, SIDE, BufferedImage.TYPE_INT_RGB);
drawImage(SIDE, image);
saveImage(image);
}
//#########################################################################
protected static void drawImage(final int SIDE, BufferedImage image) {
final int HALF = SIDE / 2;
//Draw background
new Square(HALF, HALF, SIDE, BLACK).draw(image);
//Draw foreground starting with centered half sized square
Square square = new Square(HALF, HALF, HALF, WHITE);
drawSquare(square, image);
}
//#########################################################################
protected static void drawSquare(Square square,BufferedImage image) {
LinkedStack<Square> stack = new LinkedStack<>();
stack.push(square);
square.draw(image);
while (!stack.isEmpty()) {
square = stack.top();
stack.pop();
int half = square.half();
if (half > 1) {
int left = square.left();
int top = square.top();
int right = square.right();
int bottom = square.bottom();
int newColor = square.color - 100000;
stack.push(new Square(left, top, half, newColor,square));
stack.push(new Square(left, bottom, half, newColor,square));
stack.push(new Square(right, top, half, newColor,square));
stack.push(new Square(right, bottom, half, newColor,square));
}
square.draw(image);
}
}
//#########################################################################
public static void saveImage(BufferedImage image) throws IOException {
String fileOut = "helloSquares.png";
File outputfile = new File(fileOut);
ImageIO.write(image, "jpg", outputfile);
}
}
广场课：
import java.awt.Color;
import java.awt.image.BufferedImage;
public class Square {
{
final int BLACK = Color.BLACK.getRGB();
final int WHITE = Color.WHITE.getRGB();
protected int center_x;
protected int center_y;
protected int side;
protected int color;
protected Square parentSquare;
public Square() {
this.center_x = 0;
this.center_y = 0;
this.side = 0;
this.color = WHITE;
this.parentSquare = null;
}
public Square(int center_x, int center_y, int side, int color) {
this.center_x = center_x;
this.center_y = center_y;
this.side = side;
this.color = color;
this.parentSquare = null;
}
public Square(int center_x, int center_y, int side, int color, Square parentSquare) {
this.center_x = center_x;
this.center_y = center_y;
this.side = side;
this.color = color;
this.parentSquare = parentSquare;
}
public void setX(int center_x) {
this.center_x = center_x;
}
public int getX() {
return center_x;
}
public void setY(int center_y) {
this.center_x = center_y;
}
public int getY() {
return center_y;
}
public void setSide(int side) {
this.side = side;
}
public int getSide() {
return side;
}
public void setColor(int color) {
this.color = color;
}
public int getColor() {
return color;
}
public void setParent(Square parentSquare) {
this.parentSquare = parentSquare;
}
public Square getParent() {
return parentSquare;
}
public int half() {
return side / 2;
}
public int left() {
return center_x - half();
}
public int top() {
return center_y - half();
}
public int right() {
return center_x + half();
}
public int bottom() {
return center_y + half();
}
public void draw(BufferedImage image) {
int left = left();
int top = top();
int right = right();
int bottom = bottom();
for (int i = left; i < right; i++) {
for (int j = top; j < bottom; j++) {
image.setRGB(i, j, color);
}
}
}
public boolean contains(int x, int y) {
int s = this.side;
// If at least one of the dimensions is negative
if (s < 0) {
return false;
}
//if coordiante is top left and outside of square
if (x < (this.center_x / 2) && (y < (this.center_y / 2))) {
return false;
}
//if coordinate is bottom left and outside of square
if ((x < (this.center_x / 2)) && (y > (this.center_y + (this.center_y / 2)))) {
return false;
} //checks up and down from x bounds
else if (((x > (this.center_x / 2)) && (x < this.center_x + (this.center_x / 2)))
&& (y < (this.center_y / 2)) || y > this.center_y + (this.center_y / 2)) {
return false;
}
//if coordiante is top right and outside of square
if ((x > (this.center_x + (this.center_x / 2))) && (y < (this.center_y / 2))) {
return false;
}
//if coordinate is bottom right and outside of square
if ((x > (this.center_x + (this.center_x / 2))) && (y > (this.center_y + (this.center_y / 2)))) {
return false;
} //checks left and right from y bounds
else if (((y > (this.center_y / 2)) && (y < this.center_y + (this.center_y / 2)))
&& (x < (this.center_x / 2)) || x > this.center_x + (this.center_x / 2)) {
return false;
}
return true;
}
}
链接的堆栈类别：
public class LinkedStack<T> implements StackInterface<T>
{
protected LLNode<T> top; // reference to the top of this stack
public LinkedStack()
{
top = null;
}
public void push(T element)
// Places element at the top of this stack.
{
LLNode<T> newNode = new LLNode<T>(element);
newNode.setLink(top);
top = newNode;
}
public void pop()
// Throws StackUnderflowException if this stack is empty,
// otherwise removes top element from this stack.
{
if (isEmpty())
throw new StackUnderflowException("Pop attempted on an empty stack.");
else
top = top.getLink();
}
public T top()
// Throws StackUnderflowException if this stack is empty,
// otherwise returns top element of this stack.
{
if (isEmpty())
throw new StackUnderflowException("Top attempted on an empty stack.");
else
return top.getInfo();
}
public boolean isEmpty()
// Returns true if this stack is empty, otherwise returns false.
{
return (top == null);
}
public boolean isFull()
// Returns false - a linked stack is never full
{
return false;
}
}
堆栈溢出类别：
public class StackOverflowException extends RuntimeException
{
public StackOverflowException()
{
super();
}
public StackOverflowException(String message)
{
super(message);
}
}
堆栈下溢类：
public class StackUnderflowException extends RuntimeException
{
public StackUnderflowException()
{
super();
}
public StackUnderflowException(String message)
{
super(message);
}
}
堆栈界面：
public interface StackInterface<T>
{
void push(T element) throws StackOverflowException;
// Throws StackOverflowException if this stack is full,
// otherwise places element at the top of this stack.
void pop() throws StackUnderflowException;
// Throws StackUnderflowException if this stack is empty,
// otherwise removes top element from this stack.
T top() throws StackUnderflowException;
// Throws StackUnderflowException if this stack is empty,
// otherwise returns top element of this stack.
boolean isEmpty();
// Returns true if this stack is empty, otherwise returns false.
boolean isFull();
// Returns true if this stack is full, otherwise returns false.
}
LLNODE类：
public class LLNode<T> {
{
protected LLNode<T> link;
protected T info;
public LLNode(T info) {
this.info = info;
link = null;
}
public void setInfo(T info) {
this.info = info;
}
public T getInfo() {
return info;
}
public void setLink(LLNode<T> link) {
this.link = link;
}
public LLNode<T> getLink() {
return link;
}
/**
*Adds a link to a Node
*
* @param newLink The Link to be added
*/
public void addLink(LLNode<T> newLink){
if (link == null){
this.link = newLink;
}else{
LLNode<T> temp = link;
LLNode<T> pre = null;
while (temp != null){
pre = temp;
temp = temp.link;
}
}
}
}
基本上，我想要实现的是我想修改我的上述代码（无递归代码），以在彼此之后而不是在彼此之上绘制正方形，这与我发布的第一个FractalDriver类的方式类似（非常递归）一）画他们
答案 0 :(得分：1)
这是一个比递归慢但像素完美的迭代解决方案。
我想提高速度，但现在没有时间了。
希望有帮助。
package com.stackoverflow.candied_orange;
import java.awt.image.*;
import java.awt.Color;
import java.io.*;
import javax.imageio.*;
import java.util.*;
public class InFrontInterative {
public static void main(String[] args) throws IOException{
final int SIDE = 1000; // image is SIDE X SIDE
BufferedImage image = new BufferedImage(SIDE,SIDE,BufferedImage.TYPE_INT_RGB);
drawImage(SIDE, image);
saveImage(image, "helloSquares.png");
}
//Removed IO to enable unit testing
protected static void drawImage(final int SIDE, BufferedImage image) {
final int BLACK = Color.BLACK.getRGB();
final int WHITE = Color.WHITE.getRGB();
final int HALF = SIDE / 2;
//Draw background on whole image
new Square(HALF, HALF, SIDE, BLACK).draw(image);
//Draw foreground starting with centered half sized square
Square square = new Square(HALF, HALF, HALF, WHITE);
drawFractal(square, image);
}
private static void drawFractal(Square square, BufferedImage image){
Stack<Square> squares = new Stack<>();
Queue<Square> breeders = new LinkedList<>();
breeders.add(square);
//Produce
while (breeders.size() > 0) {
square = breeders.remove();
int half = square.half();
if (half > 0) {
System.out.println(half);//TODO remove debugging code
int left = square.left();
int top = square.top();
int right = square.right();
int bottom = square.bottom();
int newColor = square.color - 100000;
breeders.add(new Square(left, top, half, newColor));
breeders.add(new Square(left, bottom, half, newColor));
breeders.add(new Square(right, top, half, newColor));
breeders.add(new Square(right, bottom, half, newColor));
squares.push(square);
}
}
//Consume
while (squares.size() > 0) {
square = squares.pop();
square.draw(image);
}
}
protected static void saveImage(BufferedImage image, String fileOut)
throws IOException {
File outputfile = new File(fileOut);
ImageIO.write(image, "jpg", outputfile);
}
}