Modifying void colorWipe's code

i'm trying modify part of strandtest code can kind of below picture. want have 1 string of leds in circle programmed light starting @ 1 point, have next points @ either side come on (while keeping previous 1 on, colorwipe does), , continue until meet again @ opposite end of circle.  how code modified that?

code: [select]

void loop() {
  // example procedures showing how display pixels:
  colorwipe(strip.color(255, 0, 0), 50); // red
  colorwipe(strip.color(0, 255, 0), 50); // green
  colorwipe(strip.color(0, 0, 255), 50); // blue
 
 

// fill dots 1 after other color
void colorwipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numpixels(); i++) {
    strip.setpixelcolor(i, c);
    strip.show();
    delay(wait);
  }
}

code: [select]

int startpixel = whatever;
strip.setpixelcolor((startpixel, c);  // first pixel
strip.show();
delay(wait);
for(uint16_t i=1; i<=strip.numpixels()/2; i++) { // half many loops
    strip.setpixelcolor((startpixel+i) % strip.numpixels, c);  //one direction, wrap
    strip.setpixelcolor((startpixel+strip.numpixels-i) % strip.numpixels, c); // other direction.
    strip.show();
    delay(wait);
  }
}

so if started @ 10 in circle of 12, loop should 11, 12, 0, 1, 2, 3
and 9 ((10+12 -1) % 12), 8, 7, 6, 5, 4

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