Tham chiếu Canvas HTML


Tham chiếu Canvas HTML

Thẻ HTML <canvas>được sử dụng để vẽ đồ họa một cách nhanh chóng, thông qua tập lệnh (thường là JavaScript).

Để tìm hiểu thêm <canvas>, vui lòng đọc hướng dẫn HTML Canvas của chúng tôi .


Màu sắc, Kiểu và Bóng

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

Kiểu đường kẻ

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


Hình chữ nhật

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

Đường dẫn

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 to that point from 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

Sự biến đổi

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()

Chữ

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

Vẽ hình ảnh

Method Description
drawImage() Draws an image, canvas, or video onto the canvas

Thao tác pixel

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

Tổng hợp

Property Description
globalAlpha Sets or returns the current alpha or transparency value of the drawing
globalCompositeOperation Sets or returns how a new image is drawn onto an existing image

Khác

Method Description
save() Saves the state of the current context
restore() Returns previously saved path state and attributes
createEvent()  
getContext()  
toDataURL()