你好，在这里我解释多边形裁剪的算法。时要求切断任何多边形，一般使用剪辑。Cliping上图中所示，通过选择原始的 image(Polygon)，我们就可以减少多边形以平面凸点。从任何角度切割下来的 3D 几何的此应用程序已使用它是砍掉多边形各边的迭代过程。完成此过程之后，你会发现最后多边形裁剪的顶点。在这里我们也找到线段与多边形的脸的交点。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001110s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.101857s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001118s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001831s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001223s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003594s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001060s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003271s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014634s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001273s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 324843 [ RunTime:0.001005s ]
