判断直线是否相交\Project1.cfg ................\Project1.dof ................\Project1.dpr ................\Project1.dproj ................\Project1.dproj.local ................\Project1.exe ................\Project1.identcache ................\Project1.res ................\Unit1.dcu ................\Unit1.dfm ................\Unit1.pas ................\__history 判断直线是否相交