html5画布边框特效，html5画布页面,HTML5 界面元素 Canvas 参考手册

HTML5 界面元素 Canvas 参考手册

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描述

html5画布边框特效，Description

The HTML5 tag is used to draw graphics, on the fly, via scripting (usually JavaScript).

However, the element has no drawing abilities of its own (it is only a Container for graphics) - you must use a script to actually draw the graphics.

The getContext() method returns an object that provides methods and properties for drawing on the canvas.

HTML css、This reference will cover the properties and methods of the getContext("2d") object, which can be used to draw text, lines, boxes, circles, and more - on the canvas.

浏览器支持

Browser Support

Internet Explorer 9, Firefox, Opera, Chrome, and Safari support and its properties and methods.

前端画布、Note: Internet Explorer 8 and earlier versions, do not support the element.

颜色、样式和阴影

Colors, Styles, and Shadows

PropertyDescription

网页设计与制作画布？Sets or returns the color, gradient, or pattern used to fill the drawing

Sets or returns the color, gradient, or pattern used for strokes

Sets or returns the color to use for shadows

Sets or returns the blur level for shadows

html5获取画布大小。Sets or returns the horizontal distance of the shadow from the shape

Sets or returns the vertical distance of the shadow from the shape

MethodDescription

Creates a linear gradient (to use on canvas content)

css canvas、Repeats a specified element in the specified direction

Creates a radial/circular gradient (to use on canvas content)

Specifies the colors and stop positions in a gradient object

线条样式

html5画布动态，Line Styles

PropertyDescription

Sets or returns the style of the end caps for a line

Sets or returns the type of corner created, when two lines meet

canvas 画布，Sets or returns the current line width

Sets or returns the maximum miter length

矩形

Rectangles

画布怎么用？MethodDescription

Creates a rectangle

Draws a "filled" rectangle

Draws a rectangle (no fill)

Clears the specified pixels within a given rectangle

路径

PathsMethodDescription

Fills the current drawing (path)

Actually draws the path you have defined

Begins a path, or resets the current path

Moves the path to the specified point in the canvas, without creating a line

Creates a path from the current point back to the starting point

Adds a new point and creates a line from that point to the last specified point in the canvas

Clips a region of any shape and size from the original canvas

Creates a quadratic Bézier curve

Creates a cubic Bézier curve

Creates an arc/curve (used to create circles, or parts of circles)

Creates an arc/curve between two tangents

Returns true if the specified point is in the current path, otherwise false

转换

Transformations

MethodDescription

Scales the current drawing bigger or smaller

Rotates the current drawing

Remaps the (0,0) position on the canvas

Replaces the current transformation matrix for the drawing

Resets the current transform to the identity matrix. Then runs transform()

文本

Text

PropertyDescription

Sets or returns the current font properties for text content

Sets or returns the current alignment for text content

Sets or returns the current text baseline used when drawing text

MethodDescription

Draws "filled" text on the canvas

Draws text on the canvas (no fill)

Returns an object that contains the width of the specified text

图像绘制

Image Drawing

MethodDescription

Draws an image, canvas, or video onto the canvas

像素操作

Pixel ManipulationPropertyDescription

Returns the width of an ImageData object

Returns the height of an ImageData object

Returns an object that contains image data of a specified ImageData object

MethodDescription

Creates a new, blank ImageData object

Returns an ImageData object that copies the pixel data for the specified rectangle on a canvas

Puts the image data (from a specified ImageData object) back onto the canvas

混合

Compositing

PropertyDescription

Sets or returns the current alpha or transparency value of the drawing

Sets or returns how a new image are drawn onto an existing image

其它

Other

MethodDescription

save()Saves the state of the current context

restore()Returns previously saved path state and attributes

createEvent()

getContext()

toDataURL()