图形学程序，用光线跟踪算法实现绘图的，中间用双缓冲解决了闪烁问题，但是速度比较慢。-Graphics program, using ray-tracing algorithm mapping, between using double buffering to resolve the flicker problem, but more slowly.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002182s ]
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:0.088372s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002401s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001962s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002453s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003760s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002102s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003263s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014701s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002720s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 242750 [ RunTime:0.001231s ]
