英文:
Recursion does not take place even after recursive call
问题
尽管这个函数的性质是递归的，但它从不递归。我完全不明白为什么会发生这种情况。
public void fill(Graphics g, View v, Point interior, Color boundaryColor, Color interiorColor) {
int x = interior.getx();
int y = interior.gety();
System.out.println("x: " + x + " y: " + y);
int pixelColor = v.getPixel(x, y); //始终为负数或零
if (pixelColor == 0) {
System.out.println("退出情况");
return;
}
if ((pixelColor != boundaryColor.getRGB()) && (pixelColor != interiorColor.getRGB())) {
System.out.println("*");
interior.drawPoint(g, v);
int nextX, nextY;
nextX = x + 1;
nextY = y;
Point p = new Point(v, nextX, nextY);
this.fill(g, v, p, boundaryColor, interiorColor);
}
}
说明：
View v、Graphics g 和 Point interior 是自定义对象；
如果函数是递归性质的，当达到退出条件时，可能会打印"退出情况"；
代码执行结果：
英文:
Even though the function is recurssive in nature it never recurse. I am completely blank why this is happening.
public void fill(Graphics g, View v, Point interior, Color boundaryColor, Color interiorColor) {
int x = interior.getx();
int y = interior.gety();
System.out.println("x: "+x+" y: "+y);
int pixelColor = v.getPixel(x, y);//always negative or zero
if( pixelColor == 0) {
System.out.println("Exit case");
return;
}
if( (pixelColor != boundaryColor.getRGB()) && (pixelColor != interiorColor.getRGB())) {
System.out.println("*");
interior.drawPoint(g, v);
int nextX, nextY;
nextX = x+1;
nextY = y;
Point p= new Point(v, nextX, nextY);
this.fill(g, v, p, boundaryColor, interiorColor);
}
}
Explanation:
View v, Graphics g and Point interior are custom objects;
If the function has been recursive in nature it might have printed "Exit Case when the exit case is reached"
Code execution results:
答案1
得分: 1
你的函数递归运行得很好，就如其输出的结果所示。然而，它没有打印出"退出情况"，这是因为pixelColor从未为0。调试你的代码，打印出pixelColor的值，尝试找出它为什么始终不为0。
英文:
Your function is recursing just fine as shown by the output it produces. What it isn't doing is printing "Exit case" because pixelColor is never 0. Debug your code/print the values of pixelColor and try to find out why it's never 0.
答案2
得分: 1
变量_pixelColor_ 似乎没有达到 0，这就是为什么您的代码没有打印出 "Exit Case"。
英文:
Variable pixelColor does not seems to be reaching 0 that is why your code is not printing "Exit Case"
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