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Interfejs HTMLCanvasElement zapewnia własności i metody pozwalające na manipulację wygladem i prezentacją elementów canvas. Dodatkowo HTMLCanvasElement dziedziczy własności i metody interfejsu HTMLElement.
<div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 20%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 120" preserveAspectRatio="xMinYMin meet"><a xlink:href="https://developer.mozilla.org/pl/docs/Web/API/EventTarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">EventTarget</text></a><polyline points="111,25 121,20 121,30 111,25" stroke="#D4DDE4" fill="none"/><line x1="121" y1="25" x2="151" y2="25" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/pl/docs/Web/API/Node" target="_top"><rect x="151" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text x="188.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Node</text></a><polyline points="226,25 236,20 236,30 226,25" stroke="#D4DDE4" fill="none"/><line x1="236" y1="25" x2="266" y2="25" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/pl/docs/Web/API/Element" target="_top"><rect x="266" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text x="303.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Element</text></a><polyline points="341,25 351,20 351,30 341,25" stroke="#D4DDE4" fill="none"/><line x1="351" y1="25" x2="381" y2="25" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/pl/docs/Web/API/HTMLElement" target="_top"><rect x="381" y="1" width="110" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text x="436" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">HTMLElement</text></a><polyline points="491,25 501,20 501,30 491,25" stroke="#D4DDE4" fill="none"/><line x1="501" y1="25" x2="509" y2="25" stroke="#D4DDE4"/><line x1="509" y1="25" x2="509" y2="90" stroke="#D4DDE4"/><line x1="509" y1="90" x2="492" y2="90" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/pl/docs/Web/API/HTMLCanvasElement" target="_top"><rect x="321" y="65" width="170" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text x="406" y="94" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">HTMLCanvasElement</text></a></svg></div>
a:hover text { fill: #0095DD; pointer-events: all;}
Własności
Własności dziedziczone są od rodzica, HTMLElement.
HTMLCanvasElement.height- Wyrażany w dodatniej
liczbie całkowitejodpowiada za atrybutheightelemetu HTML<canvas>i jest interpretowany w pikselach CSS. Jeśli atrybut nie został określony, lub została przypisana do niego nieprawidłowa wartość, np. negatywna, zostanie użyta domyślna wartość150. HTMLCanvasElement.width- Wyrażany w dodatniej
liczbie całkowitejodpowiada za atrybutwidthelemetu HTML<canvas>i jest interpretowany w pikselach CSS. Jeśli atrybut nie został określony, lub została przypisana do niego nieprawidłowa wartość, np. negatywna, zostanie użyta domyślna wartość300.
Metody
Metody dziedziczone są od rodzica, HTMLElement.
HTMLCanvasElement.captureStream()- Zwraca
CanvasCaptureMediaStream, który jest wideo w czasie rzeczywistym z powierzchni elementu<canvas>. HTMLCanvasElement.getContext()- Zwraca pole robocze elementu
<canvas>, lub null jeśli kontekst nie jest wspierany. Pole robocze pozwala na rysowanie na<canvas>. Wywołanie getContext z atrybutem"2d"zwraca obiektCanvasRenderingContext2D, natomiast wywołanie z"webgl"(lub"experimental-webgl") zwróci obiektWebGLRenderingContext. Ten kontekst jest dostepny tylko w przeglądarkach obsługujących WebGL.
HTMLCanvasElement.toDataURL()- Zwraca data-URL reprezentujacy obraz w formacie określonym przez parametr
type(domyślniepng). Zwracany obraz jest w rozdzielczości 96dpi. HTMLCanvasElement.toBlob()- Tworzy obiekt
Blobreprezentujący obraz zawierający się w<canvas>; ten plik może być buforowany z dysku lub przechowywany w pamięci wedle uznaniauser agent. HTMLCanvasElement.transferControlToOffscreen()- Przenosi kontrolę do obiektu
OffscreenCanvas, w głównym wątku lub w module roboczym. HTMLCanvasElement.mozGetAsFile()- Zwraca obiekt
Filereprezentujący obraz zawarty w<canvas>; plik oparty jest na pamięci, posiada określonąnazwę. Jeślitypnie został okreslony, domyslnie jest toimage/png.
Specyfikacja
| Specyfikacja | Status | Komentarz |
|---|---|---|
| Media Capture from DOM Elements The definition of 'HTMLCanvasElement' in that specification. |
Working Draft |
Dodano metodę |
| HTML Living Standard The definition of 'HTMLCanvasElement' in that specification. |
Living Standard |
Metoda Dodano metodę |
| HTML 5.1 The definition of 'HTMLCanvasElement' in that specification. |
Recommendation | |
| HTML5 The definition of 'HTMLCanvasElement' in that specification. |
Recommendation | Definicja początkowa. |
Zgodność przegladarek
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic support | Chrome Full support 4 | Edge Full support Yes | Firefox Full support 3.6 | IE Full support 9 | Opera
Full support
9
| Safari Full support 3.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support Yes | Opera Android
Full support
10
| Safari iOS Full support 3.2 | Samsung Internet Android Full support Yes |
height | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.6 | IE Full support 9 | Opera Full support 9 | Safari Full support 3.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
mozOpaque | Chrome No support No | Edge No support No | Firefox Full support 3.5 | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Edge Mobile No support No | Firefox Android Full support 4 | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
width | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.6 | IE Full support 9 | Opera Full support 9 | Safari Full support 3.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
captureStream | Chrome Full support 51 | Edge ? | Firefox Full support 43 | IE No support No | Opera Full support 36 | Safari ? | WebView Android Full support 51 | Chrome Android Full support 51 | Edge Mobile ? | Firefox Android Full support 43 | Opera Android Full support 38 | Safari iOS ? | Samsung Internet Android Full support 5.0 |
getContext | Chrome Full support Yes | Edge Full support 12 | Firefox Full support 3.6 | IE Full support 9 | Opera Full support 9 | Safari Full support 3.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
mozFetchAsStream | Chrome No support No | Edge No support No | Firefox No support 13 — 43 | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Edge Mobile No support No | Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
mozGetAsFile | Chrome No support No | Edge No support No | Firefox Full support 4 | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Edge Mobile No support No | Firefox Android Full support 4 | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
toBlob | Chrome Full support 50 | Edge No support No | Firefox Full support 19 | IE
Full support
10
| Opera Full support 37 | Safari
Full support
Yes
| WebView Android Full support 50 | Chrome Android Full support 50 | Edge Mobile No support No | Firefox Android Full support 4 | Opera Android Full support 37 | Safari iOS No support No | Samsung Internet Android Full support 5.0 |
toDataURL | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.6 | IE Full support 9 | Opera Full support 9 | Safari Full support 4 | WebView Android Full support Yes | Chrome Android Full support 18 | Edge Mobile No support No | Firefox Android Full support 4 | Opera Android Full support 19 | Safari iOS Full support 3 | Samsung Internet Android Full support Yes |
transferControlToOffscreen | Chrome Full support 69 | Edge No support No | Firefox
Full support
44
| IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android Full support 69 | Edge Mobile No support No | Firefox Android
Full support
44
| Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.
Zobacz też
- HTML element implementing this interface:
<canvas>.