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OffscreenCanvas.getContext

 来源:微信 浏览 682 扫码 分享 2019-12-04 21:30:43
  • RenderingContext OffscreenCanvas.getContext(string contextType)
    • 参数
      • string contextType
    • 返回值
      • RenderingContext

    RenderingContext OffscreenCanvas.getContext(string contextType)

    基础库 2.7.0 开始支持，低版本需做兼容处理。

    该方法返回 OffscreenCanvas 的绘图上下文

    参数

    string contextType

    返回值

    RenderingContext

    当前仅支持获取 WebGL 绘图上下文

    当前内容版权归 微信 或其关联方所有，如需对内容或内容相关联开源项目进行关注与资助，请访问 微信 .
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    • 基础
      • wx.canIUse
      • wx.base64ToArrayBuffer
      • wx.arrayBufferToBase64
      • 系统
        • 系统信息
          • wx.getSystemInfoSync
          • wx.getSystemInfo
      • 更新
        • wx.getUpdateManager
        • UpdateManager
          • UpdateManager.applyUpdate
          • UpdateManager.onCheckForUpdate
          • UpdateManager.onUpdateFailed
          • UpdateManager.onUpdateReady
      • 小程序
        • 生命周期
          • wx.getLaunchOptionsSync
        • 应用级事件
          • wx.onPageNotFound
          • wx.onError
          • wx.onAudioInterruptionEnd
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          • wx.onAppShow
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          • wx.offPageNotFound
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      • 调试
        • wx.setEnableDebug
        • wx.getRealtimeLogManager
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        • console
          • console.debug
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        • LogManager
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        • RealtimeLogManager
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          • RealtimeLogManager.setFilterMsg
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        • 定时器
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          • envObj
    • 路由
      • wx.switchTab
      • wx.reLaunch
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      • EventChannel
        • EventChannel.emit
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    • 界面
      • 交互
        • wx.showToast
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        • wx.showLoading
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      • 字体 wx.loadFontFace
      • 下拉刷新
        • wx.stopPullDownRefresh
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        • 置顶 wx.setTopBarText
        • 自定义组件 wx.nextTick
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        • 窗口
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        • 键盘
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          • wx.getSelectedTextRange
    • 网络
      • 发起请求
        • wx.request
        • RequestTask
          • RequestTask.abort
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        • 下载
          • wx.downloadFile
          • DownloadTask
            • DownloadTask.abort
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        • 上传 wx.uploadFile
        • UploadTask
          • UploadTask.abort
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          • UploadTask.onProgressUpdate
        • WebSocket
          • wx.sendSocketMessage
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          • wx.connectSocket
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          • SocketTask
            • SocketTask.close
            • SocketTask.onClose
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            • SocketTask.onOpen
            • SocketTask.send
        • mDNS
          • wx.stopLocalServiceDiscovery
          • wx.startLocalServiceDiscovery
          • wx.onLocalServiceResolveFail
          • wx.onLocalServiceLost
          • wx.onLocalServiceFound
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          • wx.offLocalServiceResolveFail
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          • wx.offLocalServiceFound
          • wx.offLocalServiceDiscoveryStop
        • UDP 通信
          • wx.createUDPSocket
          • UDPSocket
            • UDPSocket.bind
            • UDPSocket.close
            • UDPSocket.offClose
            • UDPSocket.offError
            • UDPSocket.offListening
            • UDPSocket.offMessage
            • UDPSocket.onClose
            • UDPSocket.onError
            • UDPSocket.onListening
            • UDPSocket.onMessage
            • UDPSocket.send
        • 数据缓存
          • wx.setStorageSync
          • wx.setStorage
          • wx.removeStorageSync
          • wx.removeStorage
          • wx.getStorageSync
          • wx.getStorageInfoSync
          • wx.getStorageInfo
          • wx.getStorage
          • wx.clearStorageSync
          • wx.clearStorage
          • 周期性更新
            • wx.setBackgroundFetchToken
            • wx.onBackgroundFetchData
            • wx.getBackgroundFetchToken
            • wx.getBackgroundFetchData
    • 媒体
      • 地图
        • wx.createMapContext
        • MapContext
          • MapContext.getCenterLocation
          • MapContext.getRegion
          • MapContext.getRotate
          • MapContext.getScale
          • MapContext.getSkew
          • MapContext.includePoints
          • MapContext.moveToLocation
          • MapContext.translateMarker
      • 图片
        • wx.saveImageToPhotosAlbum
        • wx.previewImage
        • wx.getImageInfo
        • wx.compressImage
        • wx.chooseMessageFile
        • wx.chooseImage
      • 视频
        • wx.saveVideoToPhotosAlbum
        • wx.createVideoContext
        • wx.chooseVideo
        • VideoContext
          • VideoContext.exitFullScreen
          • VideoContext.hideStatusBar
          • VideoContext.pause
          • VideoContext.play
          • VideoContext.playbackRate
          • VideoContext.requestFullScreen
          • VideoContext.seek
          • VideoContext.sendDanmu
          • VideoContext.showStatusBar
          • VideoContext.stop
      • 音频
        • wx.stopVoice
        • wx.setInnerAudioOption
        • wx.playVoice
        • wx.pauseVoice
        • wx.getAvailableAudioSources
        • wx.createInnerAudioContext
        • wx.createAudioContext
        • AudioContext
          • AudioContext.pause
          • AudioContext.play
          • AudioContext.seek
          • AudioContext.setSrc
        • InnerAudioContext
          • InnerAudioContext.destroy
          • InnerAudioContext.offCanplay
          • InnerAudioContext.offEnded
          • InnerAudioContext.offError
          • InnerAudioContext.offPause
          • InnerAudioContext.offPlay
          • InnerAudioContext.offSeeked
          • InnerAudioContext.offSeeking
          • InnerAudioContext.offStop
          • InnerAudioContext.offTimeUpdate
          • InnerAudioContext.offWaiting
          • InnerAudioContext.onCanplay
          • InnerAudioContext.onEnded
          • InnerAudioContext.onError
          • InnerAudioContext.onPause
          • InnerAudioContext.onPlay
          • InnerAudioContext.onSeeked
          • InnerAudioContext.onSeeking
          • InnerAudioContext.onStop
          • InnerAudioContext.onTimeUpdate
          • InnerAudioContext.onWaiting
          • InnerAudioContext.pause
          • InnerAudioContext.play
          • InnerAudioContext.seek
          • InnerAudioContext.stop
      • 背景音频
        • wx.stopBackgroundAudio
        • wx.seekBackgroundAudio
        • wx.playBackgroundAudio
        • wx.pauseBackgroundAudio
        • wx.onBackgroundAudioStop
        • wx.onBackgroundAudioPlay
        • wx.onBackgroundAudioPause
        • wx.getBackgroundAudioPlayerState
        • wx.getBackgroundAudioManager
        • BackgroundAudioManager
          • BackgroundAudioManager.onCanplay
          • BackgroundAudioManager.onEnded
          • BackgroundAudioManager.onError
          • BackgroundAudioManager.onNext
          • BackgroundAudioManager.onPause
          • BackgroundAudioManager.onPlay
          • BackgroundAudioManager.onPrev
          • BackgroundAudioManager.onSeeked
          • BackgroundAudioManager.onSeeking
          • BackgroundAudioManager.onStop
          • BackgroundAudioManager.onTimeUpdate
          • BackgroundAudioManager.onWaiting
          • BackgroundAudioManager.pause
          • BackgroundAudioManager.play
          • BackgroundAudioManager.seek
          • BackgroundAudioManager.stop
      • 实时音视频
        • wx.createLivePusherContext
        • wx.createLivePlayerContext
        • LivePlayerContext
          • LivePlayerContext.exitFullScreen
          • LivePlayerContext.mute
          • LivePlayerContext.pause
          • LivePlayerContext.play
          • LivePlayerContext.requestFullScreen
          • LivePlayerContext.resume
          • LivePlayerContext.snapshot
          • LivePlayerContext.stop
        • LivePusherContext
          • LivePusherContext.pause
          • LivePusherContext.pauseBGM
          • LivePusherContext.playBGM
          • LivePusherContext.resume
          • LivePusherContext.resumeBGM
          • LivePusherContext.setBGMVolume
          • LivePusherContext.snapshot
          • LivePusherContext.start
          • LivePusherContext.startPreview
          • LivePusherContext.stop
          • LivePusherContext.stopBGM
          • LivePusherContext.stopPreview
          • LivePusherContext.switchCamera
          • LivePusherContext.toggleTorch
      • 录音
        • wx.stopRecord
        • wx.startRecord
        • wx.getRecorderManager
        • RecorderManager
          • RecorderManager.onError
          • RecorderManager.onFrameRecorded
          • RecorderManager.onInterruptionBegin
          • RecorderManager.onInterruptionEnd
          • RecorderManager.onPause
          • RecorderManager.onResume
          • RecorderManager.onStart
          • RecorderManager.onStop
          • RecorderManager.pause
          • RecorderManager.resume
          • RecorderManager.start
          • RecorderManager.stop
      • 相机
        • wx.createCameraContext
        • CameraContext
          • CameraContext.onCameraFrame
          • CameraContext.startRecord
          • CameraContext.stopRecord
          • CameraContext.takePhoto
        • CameraFrameListener
          • CameraFrameListener.start
          • CameraFrameListener.stop
      • 音视频合成
        • wx.createMediaContainer
        • MediaContainer
          • MediaContainer.addTrack
          • MediaContainer.destroy
          • MediaContainer.export
          • MediaContainer.extractDataSource
          • MediaContainer.removeTrack
        • MediaTrack
    • 位置
      • wx.stopLocationUpdate
      • wx.startLocationUpdateBackground
      • wx.startLocationUpdate
      • wx.openLocation
      • wx.onLocationChange
      • wx.offLocationChange
      • wx.getLocation
      • wx.chooseLocation
    • 转发
      • wx.updateShareMenu
      • wx.showShareMenu
      • wx.hideShareMenu
      • wx.getShareInfo
    • 画布
      • wx.createOffscreenCanvas
      • wx.createCanvasContext
      • wx.canvasToTempFilePath
      • wx.canvasPutImageData
      • wx.canvasGetImageData
      • Canvas
        • Canvas.cancelAnimationFrame
        • Canvas.createImage
        • Canvas.createImageData
        • Canvas.getContext
        • Canvas.requestAnimationFrame
      • CanvasContext
        • CanvasContext.arc
        • CanvasContext.arcTo
        • CanvasContext.beginPath
        • CanvasContext.bezierCurveTo
        • CanvasContext.clearRect
        • CanvasContext.clip
        • CanvasContext.closePath
        • CanvasContext.createCircularGradient
        • CanvasContext.createLinearGradient
        • CanvasContext.createPattern
        • CanvasContext.draw
        • CanvasContext.drawImage
        • CanvasContext.fill
        • CanvasContext.fillRect
        • CanvasContext.fillText
        • CanvasContext.lineTo
        • CanvasContext.measureText
        • CanvasContext.moveTo
        • CanvasContext.quadraticCurveTo
        • CanvasContext.rect
        • CanvasContext.restore
        • CanvasContext.rotate
        • CanvasContext.save
        • CanvasContext.scale
        • CanvasContext.setFillStyle
        • CanvasContext.setFontSize
        • CanvasContext.setGlobalAlpha
        • CanvasContext.setLineCap
        • CanvasContext.setLineDash
        • CanvasContext.setLineJoin
        • CanvasContext.setLineWidth
        • CanvasContext.setMiterLimit
        • CanvasContext.setShadow
        • CanvasContext.setStrokeStyle
        • CanvasContext.setTextAlign
        • CanvasContext.setTextBaseline
        • CanvasContext.setTransform
        • CanvasContext.stroke
        • CanvasContext.strokeRect
        • CanvasContext.strokeText
        • CanvasContext.transform
        • CanvasContext.translate
      • CanvasGradient
        • CanvasGradient.addColorStop
      • Color
      • Image
      • ImageData
      • OffscreenCanvas
        • OffscreenCanvas.getContext
          • RenderingContext
    • 文件
      • wx.saveFile
      • wx.removeSavedFile
      • wx.openDocument
      • wx.getSavedFileList
      • wx.getSavedFileInfo
      • wx.getFileSystemManager
      • wx.getFileInfo
      • FileSystemManager
        • FileSystemManager.access
        • FileSystemManager.accessSync
        • FileSystemManager.appendFile
        • FileSystemManager.appendFileSync
        • FileSystemManager.copyFile
        • FileSystemManager.copyFileSync
        • FileSystemManager.getFileInfo
        • FileSystemManager.getSavedFileList
        • FileSystemManager.mkdir
        • FileSystemManager.mkdirSync
        • FileSystemManager.readdir
        • FileSystemManager.readdirSync
        • FileSystemManager.readFile
        • FileSystemManager.readFileSync
        • FileSystemManager.removeSavedFile
        • FileSystemManager.rename
        • FileSystemManager.renameSync
        • FileSystemManager.rmdir
        • FileSystemManager.rmdirSync
        • FileSystemManager.saveFile
        • FileSystemManager.saveFileSync
        • FileSystemManager.stat
        • FileSystemManager.statSync
        • FileSystemManager.unlink
        • FileSystemManager.unlinkSync
        • FileSystemManager.unzip
        • FileSystemManager.writeFile
        • FileSystemManager.writeFileSync
      • Stats
        • Stats.isDirectory
        • Stats.isFile
    • 开放接口
      • 登录
        • wx.login
        • wx.checkSession
      • 小程序跳转
        • wx.navigateToMiniProgram
        • wx.navigateBackMiniProgram
      • 帐号信息 wx.getAccountInfoSync
      • 用户信息
        • wx.getUserInfo
        • UserInfo
      • 数据上报 wx.reportMonitor
      • 数据分析 wx.reportAnalytics
      • 支付 wx.requestPayment
      • 授权 wx.authorize
      • 设置
        • wx.openSetting
        • wx.getSetting
        • AuthSetting
      • 收货地址 wx.chooseAddress
      • 卡券
        • wx.openCard
        • wx.addCard
      • 发票
        • wx.chooseInvoiceTitle
        • wx.chooseInvoice
      • 生物认证
        • wx.startSoterAuthentication
        • wx.checkIsSupportSoterAuthentication
        • wx.checkIsSoterEnrolledInDevice
      • 微信运动 wx.getWeRunData
      • 订阅消息 wx.requestSubscribeMessage
    • 设备
      • iBeacon
        • wx.stopBeaconDiscovery
        • wx.startBeaconDiscovery
        • wx.onBeaconUpdate
        • wx.onBeaconServiceChange
        • wx.offBeaconUpdate
        • wx.offBeaconServiceChange
        • wx.getBeacons
        • IBeaconInfo
      • Wi-Fi
        • wx.stopWifi
        • wx.startWifi
        • wx.setWifiList
        • wx.onWifiConnected
        • wx.onGetWifiList
        • wx.offWifiConnected
        • wx.offGetWifiList
        • wx.getWifiList
        • wx.getConnectedWifi
        • wx.connectWifi
        • WifiInfo
      • 联系人 wx.addPhoneContact
      • 低功耗蓝牙
        • wx.writeBLECharacteristicValue
        • wx.readBLECharacteristicValue
        • wx.onBLEConnectionStateChange
        • wx.onBLECharacteristicValueChange
        • wx.offBLEConnectionStateChange
        • wx.offBLECharacteristicValueChange
        • wx.notifyBLECharacteristicValueChange
        • wx.getBLEDeviceServices
        • wx.getBLEDeviceCharacteristics
        • wx.createBLEConnection
        • wx.closeBLEConnection
      • 蓝牙
        • wx.stopBluetoothDevicesDiscovery
        • wx.startBluetoothDevicesDiscovery
        • wx.openBluetoothAdapter
        • wx.onBluetoothDeviceFound
        • wx.onBluetoothAdapterStateChange
        • wx.offBluetoothDeviceFound
        • wx.offBluetoothAdapterStateChange
        • wx.getConnectedBluetoothDevices
        • wx.getBluetoothDevices
        • wx.getBluetoothAdapterState
        • wx.closeBluetoothAdapter
      • 电量
        • wx.getBatteryInfoSync
        • wx.getBatteryInfo
      • 剪贴板
        • wx.setClipboardData
        • wx.getClipboardData
      • NFC
        • wx.stopHCE
        • wx.startHCE
        • wx.sendHCEMessage
        • wx.onHCEMessage
        • wx.offHCEMessage
        • wx.getHCEState
      • 网络
        • wx.onNetworkStatusChange
        • wx.offNetworkStatusChange
        • wx.getNetworkType
      • 屏幕
        • wx.setScreenBrightness
        • wx.setKeepScreenOn
        • wx.onUserCaptureScreen
        • wx.offUserCaptureScreen
        • wx.getScreenBrightness
      • 电话 wx.makePhoneCall
      • 加速计
        • wx.stopAccelerometer
        • wx.startAccelerometer
        • wx.onAccelerometerChange
        • wx.offAccelerometerChange
      • 罗盘
        • wx.stopCompass
        • wx.startCompass
        • wx.onCompassChange
        • wx.offCompassChange
      • 设备方向
        • wx.stopDeviceMotionListening
        • wx.startDeviceMotionListening
        • wx.onDeviceMotionChange
        • wx.offDeviceMotionChange
      • 陀螺仪
        • wx.stopGyroscope
        • wx.startGyroscope
        • wx.onGyroscopeChange
        • wx.offGyroscopeChange
      • 性能
        • wx.onMemoryWarning
        • wx.offMemoryWarning
      • 扫码 wx.scanCode
      • 振动
        • wx.vibrateShort
        • wx.vibrateLong
    • Worker
      • wx.createWorker
      • Worker
        • Worker.onMessage
        • Worker.postMessage
        • Worker.terminate
    • 第三方平台
      • wx.getExtConfigSync
      • wx.getExtConfig
    • WXML
      • wx.createSelectorQuery
      • wx.createIntersectionObserver
      • IntersectionObserver
        • IntersectionObserver.disconnect
        • IntersectionObserver.observe
        • IntersectionObserver.relativeTo
        • IntersectionObserver.relativeToViewport
      • NodesRef
        • NodesRef.boundingClientRect
        • NodesRef.context
        • NodesRef.fields
        • NodesRef.node
        • NodesRef.scrollOffset
      • SelectorQuery
        • SelectorQuery.exec
        • SelectorQuery.in
        • SelectorQuery.select
        • SelectorQuery.selectAll
        • SelectorQuery.selectViewport
    • 广告
      • wx.createRewardedVideoAd
        • RewardedVideoAd
      • wx.createInterstitialAd
      • InterstitialAd
        • InterstitialAd.destroy
        • InterstitialAd.load
        • InterstitialAd.offClose
        • InterstitialAd.offError
        • InterstitialAd.offLoad
        • InterstitialAd.onClose
        • InterstitialAd.onError
        • InterstitialAd.onLoad
        • InterstitialAd.show
      • RewardedVideoAd
        • RewardedVideoAd.destroy
        • RewardedVideoAd.load
        • RewardedVideoAd.offClose
        • RewardedVideoAd.offError
        • RewardedVideoAd.offLoad
        • RewardedVideoAd.onClose
        • RewardedVideoAd.onError
        • RewardedVideoAd.onLoad
        • RewardedVideoAd.show
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