Package com.google.gwt.dom.client

Class CanvasElement

java.lang.Object

com.google.gwt.core.client.JavaScriptObject

com.google.gwt.dom.client.Node

com.google.gwt.dom.client.Element

com.google.gwt.dom.client.CanvasElement

@TagName("canvas")
public class CanvasElement
extends Element

Canvas element.

See Also:

• W3C HTML 5 Specification

Field Summary

Fields

Modifier and Type	Field	Description
static final String	TAG	The tag for this element.

Fields inherited from class com.google.gwt.dom.client.Element

DRAGGABLE_AUTO, DRAGGABLE_FALSE, DRAGGABLE_TRUE

Fields inherited from class com.google.gwt.dom.client.Node

DOCUMENT_NODE, ELEMENT_NODE, TEXT_NODE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CanvasElement()

Method Summary

Modifier and Type	Method	Description
final Context	getContext(String contextId)	Gets the rendering context that may be used to draw on this canvas.
final Context2d	getContext2d()	Returns a 2D rendering context.
final int	getHeight()	Gets the height of the canvas.
final int	getWidth()	Gets the width of the canvas.
final void	setHeight(int height)	Sets the height of the canvas.
final void	setWidth(int width)	Sets the width of the canvas.
final String	toDataUrl()	Returns a data URL for the current content of the canvas element.
final String	toDataUrl(String type)	Returns a data URL for the current content of the canvas element, with a specified type.

Methods inherited from class com.google.gwt.dom.client.Element

addClassName, as, as, blur, dispatchEvent, focus, getAbsoluteBottom, getAbsoluteLeft, getAbsoluteRight, getAbsoluteTop, getAttribute, getClassName, getClientHeight, getClientWidth, getDir, getDraggable, getElementsByTagName, getFirstChildElement, getId, getInnerHTML, getInnerText, getLang, getNextSiblingElement, getOffsetHeight, getOffsetLeft, getOffsetParent, getOffsetTop, getOffsetWidth, getPreviousSiblingElement, getPropertyBoolean, getPropertyDouble, getPropertyInt, getPropertyJSO, getPropertyObject, getPropertyString, getScrollHeight, getScrollLeft, getScrollTop, getScrollWidth, getString, getStyle, getTabIndex, getTagName, getTitle, hasAttribute, hasClassName, hasTagName, indexOfName, is, is, removeAttribute, removeClassName, replaceClassName, scrollIntoView, setAttribute, setClassName, setDir, setDraggable, setId, setInnerHTML, setInnerSafeHtml, setInnerText, setLang, setPropertyBoolean, setPropertyDouble, setPropertyInt, setPropertyJSO, setPropertyObject, setPropertyString, setScrollLeft, setScrollTop, setTabIndex, setTitle, toggleClassName

Methods inherited from class com.google.gwt.dom.client.Node

appendChild, cloneNode, getChild, getChildCount, getChildNodes, getFirstChild, getLastChild, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentElement, getParentNode, getPreviousSibling, hasChildNodes, hasParentElement, insertAfter, insertBefore, insertFirst, isOrHasChild, removeAllChildren, removeChild, removeFromParent, replaceChild, setNodeValue

Methods inherited from class com.google.gwt.core.client.JavaScriptObject

cast, createArray, createArray, createFunction, createObject, equals, hashCode, toSource, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

TAG

public static final String TAG

The tag for this element.

See Also:

• Constant Field Values

Constructor Details

CanvasElement

protected CanvasElement()

Method Details

getContext

public final Context getContext(String contextId)

Gets the rendering context that may be used to draw on this canvas.

Parameters:

contextId - the context id as a String

Returns:

the canvas rendering context

getContext2d

public final Context2d getContext2d()

Returns a 2D rendering context. This is a convenience method, see getContext(String).

Returns:

a 2D canvas rendering context

getHeight

public final int getHeight()

Gets the height of the canvas.

Returns:

the height, in pixels

See Also:

• setHeight(int)

getWidth

public final int getWidth()

Gets the width of the canvas.

Returns:

the width, in pixels

See Also:

• setWidth(int)

setHeight

public final void setHeight(int height)

Sets the height of the canvas.

Parameters:

height - the height, in pixels

See Also:

• getHeight()

setWidth

public final void setWidth(int width)

Sets the width of the canvas.

Parameters:

width - the width, in pixels

See Also:

• getWidth()

toDataUrl

public final String toDataUrl()

Returns a data URL for the current content of the canvas element.

Returns:

a data URL for the current content of this element.

toDataUrl

public final String toDataUrl(String type)

Returns a data URL for the current content of the canvas element, with a specified type.

Parameters:

type - the type of the data url, e.g., image/jpeg or image/png.

Returns:

a data URL for the current content of this element with the specified type.