Package org.apache.juneau.bean.html5

Class Canvas

java.lang.Object

org.apache.juneau.bean.html5.HtmlElement<SELF>

org.apache.juneau.bean.html5.HtmlElementMixed<Canvas>

org.apache.juneau.bean.html5.Canvas

@Marshalled(typeName="canvas")
public class Canvas
extends HtmlElementMixed<Canvas>

DTO for an HTML <canvas> element.

The canvas element provides a resolution-dependent bitmap canvas that can be used for rendering graphs, game graphics, or other visual images on the fly. It is used with JavaScript to create dynamic, scriptable rendering of 2D shapes and bitmap images. The canvas element requires both width and height attributes to define the canvas size, and the actual drawing is done through the Canvas API in JavaScript.

Examples:

import static org.apache.juneau.bean.html5.HtmlBuilder.*; // Basic canvas Canvas basic = canvas(300, 200); // Canvas with ID for JavaScript access Canvas withId = canvas(400, 300) .id("myCanvas"); // Canvas with styling Canvas styled = canvas(500, 400) .id("drawingCanvas") .class_("canvas-element") .style("border: 1px solid #ccc;"); // Canvas with event handlers Canvas interactive = canvas(800, 600) .id("gameCanvas") .onclick("handleCanvasClick(event)") .onmousemove("handleMouseMove(event)"); // Canvas with fallback content Canvas withFallback = canvas(600, 400) .id("chartCanvas") .children("Your browser does not support the canvas element."); // Canvas for data visualization Canvas chart = canvas(800, 500) .id("dataChart") .title("Interactive Data Chart"); // Canvas with accessibility Canvas accessible = canvas(400, 300) .id("accessibleCanvas") .title("Interactive drawing canvas") .children("Use your mouse to draw on this canvas.");

The following convenience methods are provided for constructing instances of this bean:

• HtmlBuilder
  • canvas()
  • canvas(Number, Number)

See Also:

• juneau-bean-html5

Constructor Summary

Constructors

Constructor	Description
Canvas()	Creates an empty Canvas element.
Canvas(Number width, Number height)	Creates a Canvas element with the specified width(Object) and height(Object) attributes.

Method Summary

Modifier and Type	Method	Description
Canvas	height(Object value)	height attribute.
Canvas	width(Object value)	width attribute.

Methods inherited from class org.apache.juneau.bean.html5.HtmlElementMixed

child, children, getChild, getChild, getChild, getChildren, setChildren

Methods inherited from class org.apache.juneau.bean.html5.HtmlElement

accesskey, attr, attrUri, class_, contenteditable, deminimize, dir, getAttr, getAttr, getAttrs, hidden, id, lang, onabort, onblur, oncancel, oncanplay, oncanplaythrough, onchange, onclick, oncuechange, ondblclick, ondurationchange, onemptied, onended, onerror, onfocus, oninput, oninvalid, onkeydown, onkeypress, onkeyup, onload, onloadeddata, onloadedmetadata, onloadstart, onmousedown, onmouseenter, onmouseleave, onmousemove, onmouseout, onmouseover, onmouseup, onmousewheel, onpause, onplay, onplaying, onprogress, onratechange, onreset, onresize, onscroll, onseeked, onseeking, onselect, onshow, onstalled, onsubmit, onsuspend, ontimeupdate, ontoggle, onvolumechange, onwaiting, self, setAttrs, spellcheck, style, tabindex, title, toString, translate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Canvas

public Canvas()

Creates an empty Canvas element.

Canvas

public Canvas(Number width,
 Number height)

Creates a Canvas element with the specified width(Object) and height(Object) attributes.

Parameters:

width - The width(Object) attribute. Can be null to unset the attribute.

height - The height(Object) attribute. Can be null to unset the attribute.

Method Details

height

public Canvas height(Object value)

height attribute.

Vertical dimension.

Parameters:

value - The new value for this attribute. Typically a Number or String. Can be null to unset the attribute.

Returns:

This object.

width

public Canvas width(Object value)

width attribute.

Horizontal dimension.

Parameters:

value - The new value for this attribute. Typically a Number or String. Can be null to unset the attribute.

Returns:

This object.