window n. 1.窗;窗口,窗戶;窗扉,窗框;窗玻璃;(商店的)櫥窗;【計(jì)算機(jī)】窗口〔電腦視頻顯示器屏幕上的視見區(qū)〕。 2.【無線電】(反雷達(dá))金屬干擾帶;偶極子干擾;反射干擾;觸發(fā)脈沖。 3.【宇宙空間技術(shù)】(火箭等的)最佳發(fā)射時(shí)限 (= launch window)。 4.大氣窗〔電磁波譜的一區(qū),其輻射不被地球大氣層吸收而能抵達(dá)地球〕;(飛船返航時(shí)的)大氣層邊緣通過區(qū)。 5. 〔pl.〕〔美俚〕眼鏡。 a French window (通陽臺(tái)的)雙扇落地玻璃門。 a blank [blind, dead, false] window 假窗。 The eyes are the windows of the mind. 眼睛是心靈的窗子。 come in by the window 越窗潛入。 have all one's goods in the window 膚淺,內(nèi)容空虛。 in the window (廣告等)貼在窗口;(商品等)擺在櫥窗里。 look out (of) the window 從窗里看外面。 throw the house out at (the) window 使陷入大混亂。 window of tube 熒光屏。 vt. 1. 在…安窗子;開窗孔于。 2. 【計(jì)算機(jī)】把(數(shù)據(jù))置入窗口;把(電腦顯示器屏幕)分隔成幾個(gè)窗口。
Second , after limitations of present algorithms are analyzed , two improved clipping algorithms of polygon against rectangle window and line against polygon window are presented 其次在分析現(xiàn)有算法不足的基礎(chǔ)上提出了矩形窗口多邊形裁剪和一般多邊形窗口線裁剪的改進(jìn)算法。
The new line against polygon window clipping algorithm which makes full use of two judgement conditions to confirm noneffective intersections between the lines and the polygon edges can only calculate the effective intersections and increases the efficiency of the clipping . third , a new 3 - d clipping algorithm of line against spherical surface window is introduced for the first time 一般多邊形窗口線裁剪的改進(jìn)算法充分利用確定被裁線段與多邊形邊無交的兩個(gè)判斷條件,對完全不可見線段以及與被裁線段無有效交點(diǎn)的多邊形邊進(jìn)行了排除,只有當(dāng)線段與多邊形邊有有效交點(diǎn)時(shí)才求交,避免了不必要的求交,提高了算法效率。