求解圆形packing问题里面的初始格局：要确定初始格局，也就是要把所有的圆饼随机的放在圆盘内，也就是圆饼的圆心坐标要随机的出现，可以用一个0到1的随机数乘圆饼的半径再乘一个判断随机数的数作为圆饼的x或者y的坐标，这样就保证了圆饼的圆心有可能出现在圆盘内的任何位置-Solving the problem inside the initial circle packing structure: To determine the initial structure, that is, to put all of the round cake on the disc in a random, that is, the center coordinates of pie appears to be random, you can use a 0 to 1 pie by a random number multiplied by the radius of a random number to determine the number of round cake as the coordinates x or y, thus ensuring the pie' s center may occur anywhere within the disc