Java 用泛光填充填充ASCII图像
嗨，我想用泛光填充alg填充ASCII图像。我总是收到错误信息，我不知道为什么 以下是我处理输入图像的主要方法：Java 用泛光填充填充ASCII图像,java,recursion,flood-fill,Java,Recursion,Flood Fill,嗨，我想用泛光填充alg填充ASCII图像。我总是收到错误信息，我不知道为什么 以下是我处理输入图像的主要方法： public static void main(String[] args){ Scanner sc = new Scanner("read 12\n+++++++++++++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n+++++
public static void main(String[] args){
Scanner sc = new Scanner("read 12\n+++++++++++++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#++\n++++++++++#--\nfill 2 2 d");
String read, numberst;
String [] image;
int number = 0, count = 0;
Boolean error = false;
read = sc.next();
numberst = sc.next();
if ((read + numberst).matches("read[0-9]+")) {
number = Integer.parseInt(numberst);
} else {
error = true;
}
image = new String[number];
System.out.println("image");
while (sc.hasNextLine() && (error == false) && (count <= number - 1)) {
image[count] = sc.next();
//System.out.println(image[count] + " " + count);
count++;
if (image[0].length() != image[count - 1].length()) {
error = true;
System.out.println("INPUT MISMATCH");
}
}
System.out.println("fill");
while(sc.hasNextLine() && (error == false) && sc.hasNext()) {
String fill = "", xstr = "", ystr = "", cstr;
fill = sc.next();
if (sc.hasNext()) {
xstr = sc.next();
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
if (sc.hasNext() && error == false){
ystr = sc.next();
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
if (sc.hasNext() && error == false){
cstr = sc.next();
if ((fill + xstr + ystr + cstr).matches("fill[0-9]+[0-9]+.")) {
int x = Integer.parseInt(xstr), y = Integer.parseInt(ystr);
char c = cstr.charAt(0);
if (x <= image[0].length() && y <= number) {
fill(image, x, y, c);
} else {
error = true;
System.out.println("OPERATION FAILED");
}
//System.out.println(fill + x + y + c);
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
//System.out.println(error);
}
if (error == false) {
for (int i = 0; i < number; ++i) {
System.out.println(image[i]);
}
}
}
我希望你能帮助我。首先，你在填水时做错了：在继续之前，你应该检查一下是否要向正确的方向前进；您首先检查所有方向，然后再继续检查。这会导致已经被替换的处理位置导致无限循环。
在第二个时间，
if（（y+1）中有一个输入错误什么症状让你认为它不起作用？请尽可能提供示例数据。诀窍是读取错误消息。它有助于识别错误是什么，以及错误在哪里。我已将错误消息添加到我的帖子中。这不是错误消息中有趣的部分，但它确实建议无限递归。我无法获得更多信息因为我无法滚动到错误消息的开头，所以无法显示我的终端窗口。问题是我不知道这种无限递归是如何发生的。非常感谢。现在它可以工作了！我希望我可以用另一种方式来做，但我们的大学不希望我们这样做。
public static void fill(String[] image, int x, int y, char c) {
char old = (image[y]).charAt(x);
Boolean r, l, o, u;
image[y] = (image[y]).substring(0, x) + c + (image[y]).substring(x + 1);
if ((x + 1) < image[0].length()) {
r = (image[y].charAt(x + 1) == old);
} else {
r = false;
}
if ((x - 1) >= 0) {
l = (image[y].charAt(x - 1) == old);
}else {
l = false;
}
if ((y - 1) >= 0) {
o = (image[y - 1].charAt(x) == old);
} else {
o = false;
}
if ((y + 1) <= image.length) {
u = (image[y + 1].charAt(x) == old);
} else {
u = false;
}
if (r == true) {
fill(image, x + 1, y, c); //According to the Error message it looks like the Java Compiler switches between this and...
}
if (l == true) {
fill(image, x - 1, y, c); //this line.
}
if (o == true) {
fill(image, x, y - 1, c);
}
if (u == true) {
fill(image, x, y + 1, c);
}
}
at AsciiShop.fill(AsciiShop.java:122)
at AsciiShop.fill(AsciiShop.java:119)
at AsciiShop.fill(AsciiShop.java:122)
at AsciiShop.fill(AsciiShop.java:119)
at AsciiShop.fill(AsciiShop.java:122)
at AsciiShop.fill(AsciiShop.java:119)
at AsciiShop.fill(AsciiShop.java:122)
at AsciiShop.fill(AsciiShop.java:119)
at AsciiShop.fill(AsciiShop.java:122)
public static void fill(String[] image, int x, int y, char c) {
char old = (image[y]).charAt(x);
image[y] = (image[y]).substring(0, x) + c + (image[y]).substring(x + 1);
if ((x + 1) < image[0].length() &&
image[y].charAt(x + 1) == old) {
fill(image, x + 1, y, c);
}
if ((x - 1) >= 0 &&
image[y].charAt(x - 1) == old) {
fill(image, x - 1, y, c);
}
if ((y - 1) >= 0 &&
image[y - 1].charAt(x) == old) {
fill(image, x, y - 1, c);
}
if ((y + 1) < image.length &&
image[y + 1].charAt(x) == old) {
fill(image, x, y + 1, c);
}
}
public static void main(String[] args) {
Scanner sc = new Scanner(
"read 12\n"
+ "+++++++++++++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#++\n"
+ "++++++++++#--\n"
+ "fill 2 2 d");
String read, numberst;
String[] image;
int number = 0, count = 0;
Boolean error = false;
read = sc.next();
numberst = sc.next();
if ((read + numberst).matches("read[0-9]+")) {
number = Integer.parseInt(numberst);
} else {
error = true;
}
image = new String[number];
System.out.println("image");
while (sc.hasNextLine() && (error == false) && (count <= number - 1)) {
image[count] = sc.next();
// System.out.println(image[count] + " " + count);
count++;
if (image[0].length() != image[count - 1].length()) {
error = true;
System.out.println("INPUT MISMATCH");
}
}
System.out.println("fill");
while (sc.hasNextLine() && (error == false) && sc.hasNext()) {
String fill = "", xstr = "", ystr = "", cstr;
fill = sc.next();
if (sc.hasNext()) {
xstr = sc.next();
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
if (sc.hasNext() && error == false) {
ystr = sc.next();
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
if (sc.hasNext() && error == false) {
cstr = sc.next();
if ((fill + xstr + ystr + cstr).matches("fill[0-9]+[0-9]+.")) {
int x = Integer.parseInt(xstr), y = Integer.parseInt(ystr);
char c = cstr.charAt(0);
if (x <= image[0].length() && y <= number) {
fill(image, x, y, image[y].charAt(x), c);
} else {
error = true;
System.out.println("OPERATION FAILED");
}
// System.out.println(fill + x + y + c);
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
} else {
error = true;
System.out.println("INPUT MISMATCH");
}
// System.out.println(error);
}
if (error == false) {
for (int i = 0; i < number; ++i) {
System.out.println(image[i]);
}
}
}
public static void fill(final String[] image, final int x, final int y, final char oldValue, final char newValue) {
if (oldValue == image[y].charAt(x)) {
image[y] = image[y].substring(0, x) + newValue + image[y].substring(x + 1);
if ((x + 1) < image[y].length()) {
fill(image, x + 1, y, oldValue, newValue);
}
if ((x - 1) >= 0) {
fill(image, x - 1, y, oldValue, newValue);
}
if ((y - 1) >= 0) {
fill(image, x, y - 1, oldValue, newValue);
}
if ((y + 1) < image.length) {
fill(image, x, y + 1, oldValue, newValue);
}
}
}