int tx1b = intercept(p.edges[rightSegment], y0, true, true);\r
int tx2a = intercept(p.edges[leftSegment], y1, true, true);\r
int tx2b = intercept(p.edges[rightSegment], y1, true, true);\r
int tx1b = intercept(p.edges[rightSegment], y0, true, true);\r
int tx2a = intercept(p.edges[leftSegment], y1, true, true);\r
int tx2b = intercept(p.edges[rightSegment], y1, true, true);\r