Objective-c flipclock shape geometry

gistfile1.c

/*
 *                  x1
 *      a-----------------------b
 *   r1/                         \
 *    p                           c
 *    |                           |
 *    |    l                 g    |
 *    |   / \             r2/ \   |y1
 *    |  m   k             h   f  |
 *    |  |   |           y3|   |  |
 *    o__n   j_____________i   e__d
 *                              x2 
 *                                  y2
 *    _____________________________
 */

float x1 = 100.0 * 2;
float x2 = 10.0 * 2;
float y1 = 50.0 * 2;
float y2 = 5.0 * 2;
float y3 = 5.0 * 2;
float r1 = 5.0 * 2;
float r2 = 3.0 * 2;

CGPoint a = CGPointMake(r1 * 2, 0.0);
CGPoint b = CGPointMake(x1 - (r1 * 2), 0);
CGPoint c = CGPointMake(x1, r1 * 2);
CGPoint d = CGPointMake(x1, y1 - (y2 / 2));
CGPoint e = CGPointMake(x1 - x2, y1 - (y2 / 2));
CGPoint f = CGPointMake(x1 - x2, y1 - (y2 / 2) - y3);
CGPoint g = CGPointMake(x1 - x2 - r2, y1 - (y2 / 2) - y3 - r2);
CGPoint h = CGPointMake(x1 - x2 - (r2 * 2), y1 - (y2 / 2) - y3);
CGPoint i = CGPointMake(x1 - x2 - (r2 * 2), y1 - (y2 / 2));
CGPoint j = CGPointMake(x2 + (r2 * 2), y1 - (y2 / 2));
CGPoint k = CGPointMake(x2 + (r2 * 2), y1 - (y2 / 2) - y3);
CGPoint l = CGPointMake(x2 + r2, y1 - (y2 / 2) - y3 - r2);
CGPoint m = CGPointMake(x2, y1 - (y2 / 2) - y3);
CGPoint n = CGPointMake(x2, y1 - (y2 / 2));
CGPoint o = CGPointMake(0, y1 - (y2 / 2));
CGPoint p = CGPointMake(0, r1 * 2);