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com.google.gwt.dom.client
Class CanvasElement

java.lang.Object
  extended by com.google.gwt.core.client.JavaScriptObject
      extended by com.google.gwt.dom.client.Node
          extended by com.google.gwt.dom.client.Element
              extended by com.google.gwt.dom.client.CanvasElement

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

Canvas element.

See Also:
W3C HTML 5 Specification

Field Summary
static java.lang.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
protected CanvasElement()
           
 
Method Summary
 Context getContext(java.lang.String contextId)
          Gets the rendering context that may be used to draw on this canvas.
 Context2d getContext2d()
          Returns a 2D rendering context.
 int getHeight()
          Gets the height of the canvas.
 int getWidth()
          Gets the width of the canvas.
 void setHeight(int height)
          Sets the height of the canvas.
 void setWidth(int width)
          Sets the width of the canvas.
 java.lang.String toDataUrl()
          Returns a data URL for the current content of the canvas element.
 java.lang.String toDataUrl(java.lang.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 Detail

TAG

public static final java.lang.String TAG
The tag for this element.

See Also:
Constant Field Values
Constructor Detail

CanvasElement

protected CanvasElement()
Method Detail

getContext

public final Context getContext(java.lang.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 java.lang.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 java.lang.String toDataUrl(java.lang.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.
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