Create a zig zag effect in array

Question

I have a one dimensional array that holds the pixels values for the image. I currently go through it like so:
for (int y = 0; y < height-1; y++) {
     offset =y*width;
     for (int x=0; x < width-1; x++) {
          pos = offset + x;
          oldPixel = pixels[pos];
...What I now want to do is instead of going in a constant left to right motion is to go in a zig zag motion. This means I want to go left to right on the first line then the second line is from right to left and then back to left to right again for the next line.
Any ideas on what would be the best way to do this?
Thanks.

Answer 1

4fingers wrote:
Any ideas on what would be the best way to do this?Are you sure about the limits? It usually looks like this,
for (int y=0; y<height; y++) {
The above will loop height times.
Anyway you can introduce a boolean variable called say leftToRight which is controlling the scanning direction,
boolean leftToRight = true;
for (int y = 0; y < height; y++) {
   offset =y*width;
   if (leftToRight) { // from left to right
      for (int x=0; x < width; x++) {
         pos = offset + x;
         oldPixel = pixels[pos];
   } else { // from right to left
      for (int x=width-1; x >= 0; x--) {
         pos = offset + x;
         oldPixel = pixels[pos];
   leftToRight = !leftToRight; // change direction