用Java“拉伸”二维数组

Question

I need to "stretch" a 2D Array filled with chars of ' ', and '*'. The stretching is based on a "Int Factor" passed in through the method.

Current Image looks like this:

*****  
*      
*    * 
***    
*   *  
*     *
***** 

Need it to look like this: (Assuming its Factor 2)

**********  
**      
**    ** 
******    
**   **  
**     **
********** 

I started to write the loop for it but I have no idea if I'm on the right track or not, really struggling with this one.

EDIT: I've gotten the array col length to stretch, I need to get the image to stretch with it now.

 public void stretch ( int factor )
 {

factor = 2;
char[][] pixelStretch = new char[pixels.length][pixels[0].length * factor];
for (int row = 0; row < pixels.length; row++)
{
    for (int col = 0; col < pixels[0].length; col+= factor) {

        for(int i=0; i<factor; i++) {
            pixelStretch[row][col+i] = pixels[row][col];
        }

}
}

pixels = pixelStretch;



}

Image printed from this:

**** 

   **
** 


****

Answer 1

Ok, some problems with your loop:

for (int col = 0; col < pixels[0].length * factor; col--)

Here, you should use pixels[row].length to get the correction column. Furthermore, it should be col++ instead of col--

If you only need to print the result, you don't actually need to stretch the array.

public void stretch ( int factor )
    {
    for (int row = 0; row < pixels.length; row++)
    {
        for (int col = 0; col < pixels[row].length; col++) {
            char c = pixels[row][col];
            if (c == ' ')
                System.out.print(c);
            else
                for (int count = 0; count < factor; count++)
                    System.out.print(c);
        }
        System.out.println();
    }
}

This prints the star/asterisk 'factor' times, and the spaces only as often as they occur in the original.

Answer 2

You're almost there. All you have to do, is change the code so that you're copying pixels[row][column] to the new array factor times

// make sure factor is not 0 before you do this
for (int col = 0; col < pixels[0].length; col++) {
   for(int i=0; i<factor; i++) {
       pixelStretch[row][col*factor+i] = pixels[row][col];
   }
}