objective c - finding iteration formula for points arranged in a triangle -

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i want arrange sprites @ following points using loop:

ccp(240.0, 160.0); ccp(300.0, 120.0); ccp(300.0, 200.0); ccp(360.0, 80.0); ccp(360.0, 160.0); ccp(360.0, 240.0);

i trying iteration formula these points using loop. i've been @ while. below visual representation of points. please help.

        *      *  *       *      *          *

do want this? (its quick, sketch only)

assume initial parameters:

initpoint (x0, y0)  initvector (vx,vy)  num of iteration c  index = c  while index   for(j = index, currentpoint = initpoint+(c-index)*(0,2*vy); j;j--, currentpoint += initvector)     draw currentpoint  index--

basically main idea is, start top right point, , shifts context of drawing initial vector many times, iteration holds (to bottom left corner) , draws points. shifts initial point down along y axis , repeat minus 1 times.


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