GetContext 2d yog dab tsi hauv canvas?
GetContext 2d yog dab tsi hauv canvas?

Video: GetContext 2d yog dab tsi hauv canvas?

Video: GetContext 2d yog dab tsi hauv canvas?
Video: Canvas2D is getting an update 2024, Kaum ib hlis
Anonim

Cov getContext () txoj kev xa rov qab ib yam khoom uas muab cov txheej txheem thiab cov khoom rau kos duab rau ntawm daim ntaub . Qhov kev siv no yuav npog cov khoom thiab cov txheej txheem ntawm cov getContext (" 2d ib ") khoom, uas tuaj yeem siv los kos cov ntawv, kab, thawv, voj voog, thiab lwm yam - ntawm lub daim ntaub.

Ib yam li ntawd, nws tau nug, 2d canvas yog dab tsi?

Lub CanvasRenderingContext2D interface, ib feem ntawm cov Canvas API, muab cov ntaub ntawv 2D rendering cov ntsiab lus rau qhov kos duab nto ntawm ib < daim ntaub > element. Nws yog siv los kos duab, ntawv, duab, thiab lwm yam khoom. Cov Canvas kev qhia muaj ntau yam lus piav qhia, piv txwv, thiab cov peev txheej, thiab.

Ib yam li ntawd, canvas API yog dab tsi? Cov Canvas API muab ib txoj hauv kev rau kos duab ntawm JavaScript thiab HTML < daim ntaub > element. Ntawm lwm yam, nws tuaj yeem siv rau cov animation, game graphics, data visualization, photo manipulation, thiab real-time video processing.

Ntawm no, kuv yuav ua li cas thiaj tau canvas ntsiab lus?

Koj ua tau tau ib a2d ntsiab lus ntawm daim ntaub nrog cov cai hauv qab no: var daim ntaub = document. getElementById(' daim ntaub '); var ctx = daim ntaub . getContext('2d'); lub console.

Dab tsi yog qhov kev siv ntawm canvas tag?

HTML < daim ntaub > keeb yog siv los kos duab, ntawm ya, ntawm JavaScript. Qhov < daim ntaub > keeb tsuas yog lub thawv rau cov duab kos. Koj yuav tsum siv JavaScript los kos cov duab kos. Canvas muaj ntau txoj hauv kev rau kev kos duab, thawv, voj voog, ntawv nyeem, thiab ntxiv cov duab.

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