HTML5 界面元素 Canvas 参考手册
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HTML5 界面元素 Canvas 参考手册
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HTML5 界面元素 Canvas 参考手册
HTML Canvas Reference
描述
Description
The HTML5 <canvas> tag is used to draw graphics, on the fly, via scripting (usually JavaScript).
However, the <canvas> 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.
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 <canvas> and its properties and methods.
Note: Internet Explorer 8 and earlier versions, do not support the <canvas> element.
颜色、样式和阴影
Colors, Styles, and Shadows
Property
Description
fillStyle
Sets or returns the color, gradient, or pattern used to fill the drawing
strokeStyle
Sets or returns the color, gradient, or pattern used for strokes
shadowColor
Sets or returns the color to use for shadows
shadowBlur
Sets or returns the blur level for shadows
shadowOffsetX
Sets or returns the horizontal distance of the shadow from the shape
shadowOffsetY
Sets or returns the vertical distance of the shadow from the shape
Method
Description
createLinearGradient()
Creates a linear gradient (to use on canvas content)
createPattern()
Repeats a specified element in the specified direction
createRadialGradient()
Creates a radial/circular gradient (to use on canvas content)
addColorStop()
Specifies the colors and stop positions in a gradient object
线条样式
Line Styles
Property
Description
lineCap
Sets or returns the style of the end caps for a line
lineJoin
Sets or returns the type of corner created, when two lines meet
lineWidth
Sets or returns the current line width
miterLimit
Sets or returns the maximum miter length
矩形
Rectangles
Method
Description
rect()
Creates a rectangle
fillRect()
Draws a "filled" rectangle
strokeRect()
Draws a rectangle (no fill)
clearRect()
Clears the specified pixels within a given rectangle
路径
Paths
Method
Description
fill()
Fills the current drawing (path)
stroke()
Actually draws the path you have defined
beginPath()
Begins a path, or resets the current path
moveTo()
Moves the path to the specified point in the canvas, without creating a line
closePath()
Creates a path from the current point back to the starting point
lineTo()
Adds a new point and creates a line from that point to the last specified point in the canvas
clip()
Clips a region of any shape and size from the original canvas
quadraticCurveTo()
Creates a quadratic Bézier curve
bezierCurveTo()
Creates a cubic Bézier curve
arc()
Creates an arc/curve (used to create circles, or parts of circles)
arcTo()
Creates an arc/curve between two tangents
isPointInPath()
Returns true if the specified point is in the current path, otherwise false
转换
Transformations
Method
Description
scale()
Scales the current drawing bigger or smaller
rotate()
Rotates the current drawing
translate()
Remaps the (0,0) position on the canvas
transform()
Replaces the current transformation matrix for the drawing
setTransform()
Resets the current transform to the identity matrix. Then runs transform()
文本
Text
Property
Description
font
Sets or returns the current font properties for text content
textAlign
Sets or returns the current alignment for text content
textBaseline
Sets or returns the current text baseline used when drawing text
Method
Description
fillText()
Draws "filled" text on the canvas
strokeText()
Draws text on the canvas (no fill)
measureText()
Returns an object that contains the width of the specified text
图像绘制
Image Drawing
Method
Description
drawImage()
Draws an image, canvas, or video onto the canvas
像素操作
Pixel Manipulation
Property
Description
width
Returns the width of an ImageData object
height
Returns the height of an ImageData object
data
Returns an object that contains image data of a specified ImageData object
Method
Description
createImageData()
Creates a new, blank ImageData object
getImageData()
Returns an ImageData object that copies the pixel data for the specified rectangle on a canvas
putImageData()
Puts the image data (from a specified ImageData object) back onto the canvas
混合
Compositing
Property
Description
globalAlpha
Sets or returns the current alpha or transparency value of the drawing
globalCompositeOperation
Sets or returns how a new image are drawn onto an existing image
其它
Other
Method
Description
save()
Saves the state of the current context
restore()
Returns previously saved path state and attributes
createEvent()
getContext()
toDataURL()
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