6.1 Polylines
Polylines yog cov khoom tsim los ntawm cov kab, kab, lossis ob qho tib si. Thiab thaum peb muaj peev xwm kos cov kab thiab ywj siab arcs muaj raws li starting taw tes rau lub xeem taw tes ntawm lwm cov kab los yog arc, thiab yog li tsim tib cov ntaub ntawv, polylines muaj lub zoo dua uas tag nrho cov kab txiav uas tsim coj raws li ib tug tib yam twj paj nruas . Yog li, peb feem ntau tus neeg mob qhov twg nws yog preferable los ua ib tug polyline feem ntawm cov kab thiab arcs ywj siab, tshwj xeeb tshaj yog thaum twg koj muaj rau kho, nws yog yooj yim los kho kom raug cov kev hloov nyob rau hauv ib tug ib yam twj paj nruas nyob rau hauv ob peb lub. Lwm cov kom zoo dua yog tias peb tuaj yeem txhais tau ib qho pib thiab zaum kawg ntawm qhov sib tw rau ib txoj kab ntawm cov polyline thiab mam li hloov qhov thickness rau tom ntej ntu. Tsis tas li ntawd, kev tsim kho ntawm cov tshuaj tiv thaiv polylines lav tias qhov pib kis ntawm kab kab los yog arc txuas mus rau yav dhau los. Qhov no union yuav tsim ib tug ntawm cov vertices ntawm polyline thiab txawm tias thaum peb hloov ncab los yog zawv zawg (raws li tau sib tham txog hauv qab no), kev twb kev txuas ntawm ob feem tseem siv tau, uas muaj kev ruaj ntseg tsim kaw nkhaus, uas muaj ntau yam zoo yuav txaus siab rau tom qab: thaum peb pom cov cheeb tsam hauv tib lub tshooj no thiab thaum peb kawm cov tsab ntawm cov khoom thiab shading.
Raws li polylines yog feem ntawm cov kab thiab arcs, cov coj kev xaiv cia peb txhais tau cov tsis peb twb paub mus ua tau ib kab los yog arcs ib lub zuj zus. Thaum koj khiav qhov hais kom ua los tsim polylines, AutoCAD nug peb ib tug thawj starting taw tes, los yeej muaj peb muaj peev xwm txiav txim siab yog hais tias tus thawj ya yog ib tug kab los yog arc thiab yog li ntawd qhia cov tsis yuav tsum tau mus kos nws.
Thaum peb tau kos ob los sis ntau zaus, ntawm cov kev xaiv ntawm qhov hais kom ua kab yog kaw lub polyline, uas yog, los koom nrog lub teeb duab kawg nrog tus thawj ib. Polyline kaw nrog ib tug arc los yog kab nyob rau ntawm qhov xwm ntawm lub xeem twv ya, txawm hais tias obviously nws yog tsis yuav tsum tau kaw lub polyline. Thaum kawg, xav txog tias nws tau hloov qhov pib thiab qhov kawg tuab ntawm txhua ntu ntawm cov polyline, nce nws cov possibilities nyob rau hauv cov creation ntawm cov ntaub ntawv.