mediacanvas
Version:
Render videos or images at multiple locations on a canvas simultaneously
124 lines (117 loc) • 21.3 kB
JavaScript
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/***/ "./build.js":
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/***/ (function(module, exports, __webpack_require__) {
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class MediaCanvas {\r\n  constructor(canvas, width = canvas.clientWidth, height = canvas.clientHeight) {\r\n    this._canvas = canvas;\r\n    this._context = canvas.getContext(\"2d\");\r\n    this._rendering = false;\r\n\r\n    this.items = [];\r\n    this._coordinateWidth = width;\r\n    this._coordinateHeight = height;\r\n    this._horizontalScale = 1.0;\r\n    this._verticalScale = 1.0;\r\n    this._width = width;\r\n    this._height = height;\r\n    this._canvas.width = width;\r\n    this._canvas.height = height;\r\n\r\n    this._startPromiseResolver = null;\r\n    this._stopPromiseResolver = null;\r\n    this._requestRenderResolver = null;\r\n\r\n    this._render = this._render.bind(this);\r\n  }\r\n\r\n  _render() {\r\n    if (this._context) {\r\n      this._context.clearRect(0, 0, this._width, this._height);\r\n      for (const item of this.items) {\r\n        this._context.drawImage(item.src, \r\n          item.x * this._horizontalScale, \r\n          item.y * this._verticalScale, \r\n          item.width * this._horizontalScale, \r\n          item.height * this._verticalScale\r\n        );\r\n      }\r\n    }\r\n\r\n    // Schedule another render\r\n    if (this._rendering)\r\n      requestAnimationFrame(this._render);\r\n    else {\r\n      if (typeof this._stopPromiseResolver === \"function\") {\r\n        this._stopPromiseResolver();\r\n        this._stopPromiseResolver = null;\r\n      }\r\n      if (typeof this._requestRenderResolver === \"function\") {\r\n        this._requestRenderResolver();\r\n        this._requestRenderResolver = null;\r\n      }\r\n    }\r\n\r\n    // Fulfill promise\r\n    if (typeof this._startPromiseResolver === \"function\") {\r\n      this._startPromiseResolver();\r\n      this._startPromiseResolver = null;\r\n    }\r\n  }\r\n\r\n  get rendering() {\r\n    return this._rendering;\r\n  }\r\n  \r\n  get width() {\r\n    return this._width;\r\n  }\r\n\r\n  set width(width) {\r\n    this.setDimensions(width, this._height);\r\n  }\r\n\r\n  get height() {\r\n    return this._height;\r\n  }\r\n\r\n  set height(height) {\r\n    this.setDimensions(this._width, height);\r\n  }\r\n\r\n  get originalWidth() {\r\n    return this._coordinateWidth;\r\n  }\r\n\r\n  get originalHeight() {\r\n    return this._coordinateHeight;\r\n  }\r\n\r\n  setDimensions(width, height) {\r\n    this._width = width;\r\n    this._canvas.width = width;\r\n    this._horizontalScale = width / this._coordinateWidth;\r\n\r\n    this._height = height;\r\n    this._canvas.height = height;\r\n    this._verticalScale = height / this._coordinateHeight;\r\n\r\n    if (!this._rendering)\r\n      this._render();\r\n  }\r\n\r\n  matchClientDimensions() {\r\n    this.setDimensions(this._canvas.clientWidth, this._canvas.clientHeight);\r\n  }\r\n\r\n  start() {\r\n    return new Promise((resolve, reject) => {\r\n      if (this._rendering)\r\n        reject(new Error(\"The renderer is already started.\"));\r\n      else {\r\n        this._rendering = true;\r\n        this._startPromiseResolver = resolve;\r\n        requestAnimationFrame(this._render);\r\n      }\r\n    });\r\n  }\r\n\r\n  stop() {\r\n    return new Promise((resolve, reject) => {\r\n      if (this._rendering) {\r\n        this._stopPromiseResolver = resolve;\r\n        this._rendering = false;\r\n      }\r\n      else\r\n        reject(new Error(\"The renderer is already stopped.\"));\r\n    });\r\n  }\r\n\r\n  requestRender() {\r\n    return new Promise((resolve, reject) => {\r\n      if (this._rendering)\r\n        reject(new Error(\"The renderer is already started.\"));\r\n      else if (this._requestRenderResolver !== null)\r\n        reject(new Error(\"A render has already been scheduled.\"));\r\n      else {\r\n        this._requestRenderResolver = resolve;\r\n        requestAnimationFrame(this._render);\r\n      }\r\n    });\r\n  }\r\n}\r\n\r\nexport default MediaCanvas;\r\n"],"sourceRoot":""}\n//# 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