計(jì)算機(jī)繪圖簡(jiǎn)介ppt課件-資料下載頁(yè)
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【正文】 to Graphics Software AutoCAD繪圖軟件簡(jiǎn)介 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 2. Command repetition and stop 命令的重復(fù)、中止 (1) Repeat a mand 命令的重復(fù) When the mand line displays “Command:”, you can always repeat a mand by pressing the Spacebar or ENTER no matter what modes you are using for mand input. 無(wú)論以上述哪種方式輸入了最后一條命令，都可以在 下一行“ Command” 指示下，鍵入空格鍵或回車鍵重復(fù)該命令。 (3) Withdraw a mand 命令的撤消 One can withdraw one or more mands using the “U” or “UNDO” mands. REDO, on the other hand, can be used to redo a mand withdrawn by “U” or “UNDO” mands. 可以利用 U命令或 UNDO命令撤消一個(gè)或者若干個(gè)命令 , 或用 REDO命令取消發(fā)出的 U命令或 UNDO命令。 (2) Stop a mand 命令的中止 While performing an operation, click the ESC key will stop the running mand. 在執(zhí)行命令的過(guò)程中 ,只須按下 ESC鍵 ,即可中止該命令的執(zhí)行。 Introduction to Graphics Software AutoCAD繪圖軟件簡(jiǎn)介 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 3. Method for data input 數(shù)據(jù)的輸入方式 (1) Pick up data by the center of cursor 光標(biāo)中心拾取數(shù)據(jù) This mode is intuitive and you can track the coordinates in the status line by press the F6 key. 使用鼠標(biāo)選擇位置拾取數(shù)據(jù)比較直觀。按 F6鍵可 在狀態(tài)行上實(shí)時(shí)跟蹤光標(biāo)中心的坐標(biāo)。 (2) Input data through keyboard 鍵盤輸入數(shù)據(jù) Exact coordinates can be entered through keyboard. There are three mon modes for imputing data through keyboard: 鍵盤往往用于準(zhǔn)確 的坐標(biāo)位置數(shù)據(jù)的輸入。常用的鍵盤輸入數(shù)據(jù)有三種方式： 3) Input date using polar coordinates 極坐標(biāo)輸入數(shù)據(jù) There are also two input methods for polar coordinates, absolute polar coordinates or relative polar coordinates. The absolute polar coordinates (distance and angle) are defined with respect to the origin of the coordinate system and are rarely used. The relative polar coordinates (distance and angle) are defined with respect to the previous point, which is quite convenient to use. 極坐標(biāo)輸入數(shù)據(jù)又分絕對(duì)極坐標(biāo) 和相對(duì)極坐標(biāo)兩種。絕對(duì)極坐標(biāo)中各點(diǎn)的位移 (指距離和角度 )是相對(duì)于原點(diǎn) 而言 (使用較少 )；相對(duì)極坐標(biāo)的位移則是以前一輸入點(diǎn)作為極心 ,即輸入相 對(duì)于前一點(diǎn)的距離和角度 ,使用比較方便。 Introduction to Graphics Software AutoCAD繪圖軟件簡(jiǎn)介 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 2) Input data with relative coordinates 相對(duì)坐標(biāo)輸入 Relative coordinates are defined with reference to the previous point. The relative coordinates define the difference from the point being entered to the previous point. 數(shù)據(jù)相對(duì)坐標(biāo)是指一個(gè)點(diǎn)相對(duì)于上一個(gè)輸入點(diǎn)的坐標(biāo)值而言的，所關(guān)聯(lián)的是 前后輸入兩個(gè)點(diǎn)之間的坐標(biāo)關(guān)系。 1) Input data with absolute coordinates 絕對(duì)坐標(biāo)輸入數(shù)據(jù) Absolute coordinates are defined with reference to the coordinate system displayed on the lower left corner of the 點(diǎn)為坐標(biāo)系的原點(diǎn)。 本 小 節(jié) 結(jié) 束 謝謝您的認(rèn)真學(xué)習(xí)！ 退出 前一頁(yè)
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