作者： Next

CanvasContext.createCircularGradient(number x, number y, number r)

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

创建一个圆形的渐变颜色。起点在圆心，终点在圆环。返回的CanvasGradient对象需要使用 CanvasGradient.addColorStop() 来指定渐变点，至少要两个。

参数

number x

圆心的 x 坐标

number y

圆心的 y 坐标

number r

圆的半径

返回值

CanvasGradient

示例代码

const ctx = wx.createCanvasContext('myCanvas')

// Create circular gradient
const grd = ctx.createCircularGradient(75, 50, 50)
grd.addColorStop(0, 'red')
grd.addColorStop(1, 'white')

// Fill with gradient
ctx.setFillStyle(grd)
ctx.fillRect(10, 10, 150, 80)
ctx.draw()

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CanvasContext.closePath()

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

关闭一个路径。会连接起点和终点。如果关闭路径后没有调用 fill 或者 stroke 并开启了新的路径，那之前的路径将不会被渲染。

示例代码

const ctx = wx.createCanvasContext('myCanvas')
ctx.moveTo(10, 10)
ctx.lineTo(100, 10)
ctx.lineTo(100, 100)
ctx.closePath()
ctx.stroke()
ctx.draw()


const ctx = wx.createCanvasContext('myCanvas')
// begin path
ctx.rect(10, 10, 100, 30)
ctx.closePath()

// begin another path
ctx.beginPath()
ctx.rect(10, 40, 100, 30)

// only fill this rect, not in current path
ctx.setFillStyle('blue')
ctx.fillRect(10, 70, 100, 30)

ctx.rect(10, 100, 100, 30)

// it will fill current path
ctx.setFillStyle('red')
ctx.fill()
ctx.draw()

CanvasContext.clip()

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

基础库 1.6.0 开始支持，低版本需做兼容处理。

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

从原始画布中剪切任意形状和尺寸。一旦剪切了某个区域，则所有之后的绘图都会被限制在被剪切的区域内（不能访问画布上的其他区域）。可以在使用 clip 方法前通过使用 save 方法对当前画布区域进行保存，并在以后的任意时间通过restore方法对其进行恢复。

示例代码

const ctx = wx.createCanvasContext('myCanvas')

wx.downloadFile({
  url: 'http://is5.mzstatic.com/image/thumb/Purple128/v4/75/3b/90/753b907c-b7fb-5877-215a-759bd73691a4/source/50x50bb.jpg',
  success: function(res) {
    ctx.save()
    ctx.beginPath()
    ctx.arc(50, 50, 25, 0, 2*Math.PI)
    ctx.clip()
    ctx.drawImage(res.tempFilePath, 25, 25)
    ctx.restore()
    ctx.draw()
  }
})

<img alt="" 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%0A

CanvasContext.clearRect(number x, number y, number width, number height)

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

清除画布上在该矩形区域内的内容

参数

number x

矩形路径左上角的横坐标

number y

矩形路径左上角的纵坐标

number width

矩形路径的宽度

number height

矩形路径的高度

示例代码

clearRect 并不是在指定区域画一个白色的矩形，而是清空该区域。为了有直观感受，这里给 canvas 加了一层背景色。

<canvas canvas-id="myCanvas" style="border: 1px solid; background: #123456;"/>

const ctx = wx.createCanvasContext('myCanvas')
ctx.setFillStyle('red')
ctx.fillRect(0, 0, 150, 200)
ctx.setFillStyle('blue')
ctx.fillRect(150, 0, 150, 200)
ctx.clearRect(10, 10, 150, 75)
ctx.draw()

<img alt="" 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CanvasContext.bezierCurveTo 方法

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

创建三次方贝塞尔曲线路径。曲线的起始点为路径中前一个点。

参数

number cp1x

第一个贝塞尔控制点的 x 坐标

number cp1y

第一个贝塞尔控制点的 y 坐标

number cp2x

第二个贝塞尔控制点的 x 坐标

number cp2y

第二个贝塞尔控制点的 y 坐标

number x

结束点的 x 坐标

number y

结束点的 y 坐标

示例代码

const ctx = wx.createCanvasContext('myCanvas')

// Draw points
ctx.beginPath()
ctx.arc(20, 20, 2, 0, 2 * Math.PI)
ctx.setFillStyle('red')
ctx.fill()

ctx.beginPath()
ctx.arc(200, 20, 2, 0, 2 * Math.PI)
ctx.setFillStyle('lightgreen')
ctx.fill()

ctx.beginPath()
ctx.arc(20, 100, 2, 0, 2 * Math.PI)
ctx.arc(200, 100, 2, 0, 2 * Math.PI)
ctx.setFillStyle('blue')
ctx.fill()

ctx.setFillStyle('black')
ctx.setFontSize(12)

// Draw guides
ctx.beginPath()
ctx.moveTo(20, 20)
ctx.lineTo(20, 100)
ctx.lineTo(150, 75)

ctx.moveTo(200, 20)
ctx.lineTo(200, 100)
ctx.lineTo(70, 75)
ctx.setStrokeStyle('#AAAAAA')
ctx.stroke()

// Draw quadratic curve
ctx.beginPath()
ctx.moveTo(20, 20)
ctx.bezierCurveTo(20, 100, 200, 100, 200, 20)
ctx.setStrokeStyle('black')
ctx.stroke()

ctx.draw()

针对 moveTo(20, 20) bezierCurveTo(20, 100, 200, 100, 200, 20) 的三个关键坐标如下：

  • 红色：起始点(20, 20)
  • 蓝色：两个控制点(20, 100) (200, 100)
  • 绿色：终止点(200, 20)

CanvasContext.beginPath()

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

开始创建一个路径。需要调用 fill 或者 stroke 才会使用路径进行填充或描边

  • 在最开始的时候相当于调用了一次 beginPath。
  • 同一个路径内的多次 setFillStyle、setStrokeStyle、setLineWidth等设置，以最后一次设置为准。

示例代码

const ctx = wx.createCanvasContext('myCanvas')
// begin path
ctx.rect(10, 10, 100, 30)
ctx.setFillStyle('yellow')
ctx.fill()

// begin another path
ctx.beginPath()
ctx.rect(10, 40, 100, 30)

// only fill this rect, not in current path
ctx.setFillStyle('blue')
ctx.fillRect(10, 70, 100, 30)

ctx.rect(10, 100, 100, 30)

// it will fill current path
ctx.setFillStyle('red')
ctx.fill()
ctx.draw()

CanvasContext.arcTo(number x1, number y1, number x2, number y2, number radius)

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

基础库 1.9.90 开始支持，低版本需做兼容处理。

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

根据控制点和半径绘制圆弧路径。

参数

number x1

第一个控制点的 x 轴坐标

number y1

第一个控制点的 y 轴坐标

number x2

第二个控制点的 x 轴坐标

number y2

第二个控制点的 y 轴坐标

number radius

圆弧的半径

CanvasContext.arc创建圆形路径

CanvasContext 是旧版的接口，新版 Canvas 2D 接口与 Web 一致

从基础库 2.9.0 开始，本接口停止维护，请使用 RenderingContext 代替

微信小程序插件：支持

相关文档: 旧版画布迁移指南、canvas 组件介绍

功能描述

创建一条弧线。

  • 创建一个圆可以指定起始弧度为 0，终止弧度为 2 * Math.PI。
  • 用 stroke 或者 fill 方法来在 canvas 中画弧线。

参数

number x

圆心的 x 坐标

number y

圆心的 y 坐标

number r

圆的半径

number sAngle

起始弧度，单位弧度（在3点钟方向）

number eAngle

终止弧度

boolean counterclockwise

弧度的方向是否是逆时针

示例代码

const ctx = wx.createCanvasContext('myCanvas')

// Draw coordinates
ctx.arc(100, 75, 50, 0, 2 * Math.PI)
ctx.setFillStyle('#EEEEEE')
ctx.fill()

ctx.beginPath()
ctx.moveTo(40, 75)
ctx.lineTo(160, 75)
ctx.moveTo(100, 15)
ctx.lineTo(100, 135)
ctx.setStrokeStyle('#AAAAAA')
ctx.stroke()

ctx.setFontSize(12)
ctx.setFillStyle('black')
ctx.fillText('0', 165, 78)
ctx.fillText('0.5*PI', 83, 145)
ctx.fillText('1*PI', 15, 78)
ctx.fillText('1.5*PI', 83, 10)

// Draw points
ctx.beginPath()
ctx.arc(100, 75, 2, 0, 2 * Math.PI)
ctx.setFillStyle('lightgreen')
ctx.fill()

ctx.beginPath()
ctx.arc(100, 25, 2, 0, 2 * Math.PI)
ctx.setFillStyle('blue')
ctx.fill()

ctx.beginPath()
ctx.arc(150, 75, 2, 0, 2 * Math.PI)
ctx.setFillStyle('red')
ctx.fill()

// Draw arc
ctx.beginPath()
ctx.arc(100, 75, 50, 0, 1.5 * Math.PI)
ctx.setStrokeStyle('#333333')
ctx.stroke()

ctx.draw()

<img alt="" 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%0A

CanvasContext

相关文档: 旧版画布迁移指南、canvas 组件介绍

canvas 组件的绘图上下文。CanvasContext 是旧版的接口， 新版 Canvas 2D 接口与 Web 一致。

属性

string|CanvasGradient fillStyle

基础库 1.9.90 开始支持，低版本需做兼容处理。

填充颜色。用法同 CanvasContext.setFillStyle()。

string|CanvasGradient strokeStyle

基础库 1.9.90 开始支持，低版本需做兼容处理。

边框颜色。用法同 CanvasContext.setStrokeStyle()。

number shadowOffsetX

基础库 1.9.90 开始支持，低版本需做兼容处理。

阴影相对于形状在水平方向的偏移

number shadowOffsetY

基础库 1.9.90 开始支持，低版本需做兼容处理。

阴影相对于形状在竖直方向的偏移

number shadowColor

基础库 1.9.90 开始支持，低版本需做兼容处理。

阴影的颜色

number shadowBlur

基础库 1.9.90 开始支持，低版本需做兼容处理。

阴影的模糊级别

number lineWidth

基础库 1.9.90 开始支持，低版本需做兼容处理。

线条的宽度。用法同 CanvasContext.setLineWidth()。

string lineCap

基础库 1.9.90 开始支持，低版本需做兼容处理。

线条的端点样式。用法同 CanvasContext.setLineCap()。

string lineJoin

基础库 1.9.90 开始支持，低版本需做兼容处理。

线条的交点样式。用法同 CanvasContext.setLineJoin()。

lineJoin 的合法值

值 说明 最低版本
bevel 斜角
round 圆角
miter 尖角

number miterLimit

基础库 1.9.90 开始支持，低版本需做兼容处理。

最大斜接长度。用法同 CanvasContext.setMiterLimit()。

number lineDashOffset

基础库 1.9.90 开始支持，低版本需做兼容处理。

虚线偏移量，初始值为0

string font

基础库 1.9.90 开始支持，低版本需做兼容处理。

当前字体样式的属性。符合 CSS font 语法 的 DOMString 字符串，至少需要提供字体大小和字体族名。默认值为 10px sans-serif。

number globalAlpha

全局画笔透明度。范围 0-1，0 表示完全透明，1 表示完全不透明。

string globalCompositeOperation

基础库 1.9.90 开始支持，低版本需做兼容处理。

在绘制新形状时应用的合成操作的类型。目前安卓版本只适用于 fill 填充块的合成，用于 stroke 线段的合成效果都是 source-over。

目前支持的操作有

  • 安卓：xor, source-over, source-atop, destination-out, lighter, overlay, darken, lighten, hard-light
  • iOS：xor, source-over, source-atop, destination-over, destination-out, lighter, multiply, overlay, darken, lighten, color-dodge, color-burn, hard-light, soft-light, difference, exclusion, saturation, luminosity

方法

CanvasContext.draw(boolean reserve, function callback)

将之前在绘图上下文中的描述（路径、变形、样式）画到 canvas 中。

CanvasGradient CanvasContext.createLinearGradient(number x0, number y0, number x1, number y1)

创建一个线性的渐变颜色。返回的CanvasGradient对象需要使用 CanvasGradient.addColorStop() 来指定渐变点，至少要两个。

CanvasGradient CanvasContext.createCircularGradient(number x, number y, number r)

创建一个圆形的渐变颜色。起点在圆心，终点在圆环。返回的CanvasGradient对象需要使用 CanvasGradient.addColorStop() 来指定渐变点，至少要两个。

CanvasContext.createPattern(string image, string repetition)

对指定的图像创建模式的方法，可在指定的方向上重复元图像

Object CanvasContext.measureText(string text)

测量文本尺寸信息。目前仅返回文本宽度。同步接口。

CanvasContext.save()

保存绘图上下文。

CanvasContext.restore()

恢复之前保存的绘图上下文。

CanvasContext.beginPath()

开始创建一个路径。需要调用 fill 或者 stroke 才会使用路径进行填充或描边

  • 在最开始的时候相当于调用了一次 beginPath。
  • 同一个路径内的多次 setFillStyle、setStrokeStyle、setLineWidth等设置，以最后一次设置为准。

CanvasContext.moveTo(number x, number y)

把路径移动到画布中的指定点，不创建线条。用 stroke 方法来画线条

CanvasContext.lineTo(number x, number y)

增加一个新点，然后创建一条从上次指定点到目标点的线。用 stroke 方法来画线条

CanvasContext.quadraticCurveTo(number cpx, number cpy, number x, number y)

创建二次贝塞尔曲线路径。曲线的起始点为路径中前一个点。

CanvasContext.bezierCurveTo(number cp1x, number cp1y, number cp2x, number cp2y, number x, number y)

创建三次方贝塞尔曲线路径。曲线的起始点为路径中前一个点。

CanvasContext.arc(number x, number y, number r, number sAngle, number eAngle, boolean counterclockwise)

创建一条弧线。

  • 创建一个圆可以指定起始弧度为 0，终止弧度为 2 * Math.PI。
  • 用 stroke 或者 fill 方法来在 canvas 中画弧线。

CanvasContext.rect(number x, number y, number width, number height)

创建一个矩形路径。需要用 fill 或者 stroke 方法将矩形真正的画到 canvas 中

CanvasContext.arcTo(number x1, number y1, number x2, number y2, number radius)

根据控制点和半径绘制圆弧路径。

CanvasContext.clip()

从原始画布中剪切任意形状和尺寸。一旦剪切了某个区域，则所有之后的绘图都会被限制在被剪切的区域内（不能访问画布上的其他区域）。可以在使用 clip 方法前通过使用 save 方法对当前画布区域进行保存，并在以后的任意时间通过restore方法对其进行恢复。

CanvasContext.fillRect(number x, number y, number width, number height)

填充一个矩形。用 setFillStyle 设置矩形的填充色，如果没设置默认是黑色。

CanvasContext.strokeRect(number x, number y, number width, number height)

画一个矩形(非填充)。 用 setStrokeStyle 设置矩形线条的颜色，如果没设置默认是黑色。

CanvasContext.clearRect(number x, number y, number width, number height)

清除画布上在该矩形区域内的内容

CanvasContext.fill()

对当前路径中的内容进行填充。默认的填充色为黑色。

CanvasContext.stroke()

画出当前路径的边框。默认颜色色为黑色。

CanvasContext.closePath()

关闭一个路径。会连接起点和终点。如果关闭路径后没有调用 fill 或者 stroke 并开启了新的路径，那之前的路径将不会被渲染。

CanvasContext.scale(number scaleWidth, number scaleHeight)

在调用后，之后创建的路径其横纵坐标会被缩放。多次调用倍数会相乘。

CanvasContext.rotate(number rotate)

以原点为中心顺时针旋转当前坐标轴。多次调用旋转的角度会叠加。原点可以用 translate 方法修改。

CanvasContext.translate(number x, number y)

对当前坐标系的原点 (0, 0) 进行变换。默认的坐标系原点为页面左上角。

CanvasContext.drawImage(string imageResource, number sx, number sy, number sWidth, number sHeight, number dx, number dy, number dWidth, number dHeight)

绘制图像到画布

CanvasContext.strokeText(string text, number x, number y, number maxWidth)

给定的 (x, y) 位置绘制文本描边的方法

CanvasContext.transform(number scaleX, number skewX, number skewY, number scaleY, number translateX, number translateY)

使用矩阵多次叠加当前变换的方法

CanvasContext.setTransform(number scaleX, number skewX, number skewY, number scaleY, number translateX, number translateY)

使用矩阵重新设置（覆盖）当前变换的方法

CanvasContext.setFillStyle(string|CanvasGradient color)

设置填充色。

CanvasContext.setStrokeStyle(string|CanvasGradient color)

设置描边颜色。

CanvasContext.setShadow(number offsetX, number offsetY, number blur, string color)

设定阴影样式。

CanvasContext.setGlobalAlpha(number alpha)

设置全局画笔透明度。

CanvasContext.setLineWidth(number lineWidth)

设置线条的宽度

CanvasContext.setLineJoin(string lineJoin)

设置线条的交点样式

CanvasContext.setLineCap(string lineCap)

设置线条的端点样式

CanvasContext.setLineDash(Array. pattern, number offset)

设置虚线样式。

CanvasContext.setMiterLimit(number miterLimit)

设置最大斜接长度。斜接长度指的是在两条线交汇处内角和外角之间的距离。当 CanvasContext.setLineJoin() 为 miter 时才有效。超过最大倾斜长度的，连接处将以 lineJoin 为 bevel 来显示。

CanvasContext.fillText(string text, number x, number y, number maxWidth)

在画布上绘制被填充的文本

CanvasContext.setFontSize(number fontSize)

设置字体的字号

CanvasContext.setTextAlign(string align)

设置文字的对齐

CanvasContext.setTextBaseline(string textBaseline)

设置文字的竖直对齐

Canvas.toDataURL

基础库 2.11.0 开始支持，低版本需做兼容处理。

微信小程序插件：支持

相关文档: 画布指南、canvas 组件介绍

功能描述

返回一个包含图片展示的 data URI 。可以使用 type 参数指定其类型，默认为 PNG 格式。

参数

string type

图片格式，默认为 image/png

number encoderOptions

在指定图片格式为 image/jpeg 或 image/webp的情况下，可以从 0 到 1 的区间内选择图片的质量。如果超出取值范围，将会使用默认值 0.92。其他参数会被忽略。

返回值

string