Mercurial > hg > orthanc-stone
diff Platforms/Wasm/wasm-viewport.ts @ 236:f73d722d98c8 am
renamed folder
author | am@osimis.io |
---|---|
date | Tue, 19 Jun 2018 16:06:32 +0200 |
parents | Platforms/WebAssembly/wasm-viewport.ts@9afb50d1ac14 |
children | 313903066093 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Platforms/Wasm/wasm-viewport.ts Tue Jun 19 16:06:32 2018 +0200 @@ -0,0 +1,269 @@ +var isPendingRedraw = false; + +function ScheduleWebViewportRedraw(cppViewportHandle: any) : void +{ + if (!isPendingRedraw) { + isPendingRedraw = true; + console.log('Scheduling a refresh of the viewport, as its content changed'); + window.requestAnimationFrame(function() { + isPendingRedraw = false; + Stone.WasmViewport.GetFromCppViewport(cppViewportHandle).Redraw(); + }); + } +} + +declare function UTF8ToString(any): string; + +function CreateWasmViewport(htmlCanvasId: string) : any { + var cppViewportHandle = CreateCppViewport(); + var canvasId = UTF8ToString(htmlCanvasId); + var webViewport = new Stone.WasmViewport(StoneFrameworkModule, canvasId, cppViewportHandle); // viewports are stored in a static map in WasmViewport -> won't be deleted + webViewport.Initialize(); + + return cppViewportHandle; +} + +module Stone { + +// export declare type InitializationCallback = () => void; + +// export declare var StoneFrameworkModule : any; + + //const ASSETS_FOLDER : string = "assets/lib"; + //const WASM_FILENAME : string = "orthanc-framework"; + + export class WasmViewport { + + private static cppWebViewportsMaps_ : Map<number, WasmViewport> = new Map<number, WasmViewport>(); + + private module_ : any; + private canvasId_ : string; + private htmlCanvas_ : HTMLCanvasElement; + private context_ : CanvasRenderingContext2D; + private imageData_ : any = null; + private renderingBuffer_ : any = null; + private touchZoom_ : any = false; + private touchTranslation_ : any = false; + + private ViewportSetSize : Function; + private ViewportRender : Function; + private ViewportMouseDown : Function; + private ViewportMouseMove : Function; + private ViewportMouseUp : Function; + private ViewportMouseEnter : Function; + private ViewportMouseLeave : Function; + private ViewportMouseWheel : Function; + private ViewportKeyPressed : Function; + + private pimpl_ : any; // Private pointer to the underlying WebAssembly C++ object + + public constructor(module: any, canvasId: string, cppViewport: any) { + + this.pimpl_ = cppViewport; + WasmViewport.cppWebViewportsMaps_[this.pimpl_] = this; + + this.module_ = module; + this.canvasId_ = canvasId; + this.htmlCanvas_ = document.getElementById(this.canvasId_) as HTMLCanvasElement; + this.context_ = this.htmlCanvas_.getContext('2d'); + + this.ViewportSetSize = this.module_.cwrap('ViewportSetSize', null, [ 'number', 'number', 'number' ]); + this.ViewportRender = this.module_.cwrap('ViewportRender', null, [ 'number', 'number', 'number', 'number' ]); + this.ViewportMouseDown = this.module_.cwrap('ViewportMouseDown', null, [ 'number', 'number', 'number', 'number', 'number' ]); + this.ViewportMouseMove = this.module_.cwrap('ViewportMouseMove', null, [ 'number', 'number', 'number' ]); + this.ViewportMouseUp = this.module_.cwrap('ViewportMouseUp', null, [ 'number' ]); + this.ViewportMouseEnter = this.module_.cwrap('ViewportMouseEnter', null, [ 'number' ]); + this.ViewportMouseLeave = this.module_.cwrap('ViewportMouseLeave', null, [ 'number' ]); + this.ViewportMouseWheel = this.module_.cwrap('ViewportMouseWheel', null, [ 'number', 'number', 'number', 'number', 'number' ]); + this.ViewportKeyPressed = this.module_.cwrap('ViewportKeyPressed', null, [ 'number', 'string', 'number', 'number' ]); + } + + public GetCppViewport() : number { + return this.pimpl_; + } + + public static GetFromCppViewport(cppViewportHandle: number) : WasmViewport { + if (WasmViewport.cppWebViewportsMaps_[cppViewportHandle] !== undefined) { + return WasmViewport.cppWebViewportsMaps_[cppViewportHandle]; + } + console.log("WasmViewport not found !"); + return undefined; + } + + public Redraw() { + if (this.imageData_ === null || + this.renderingBuffer_ === null || + this.ViewportRender(this.pimpl_, + this.imageData_.width, + this.imageData_.height, + this.renderingBuffer_) == 0) { + console.log('The rendering has failed'); + } else { + // Create an accessor to the rendering buffer (i.e. create a + // "window" above the heap of the WASM module), then copy it to + // the ImageData object + this.imageData_.data.set(new Uint8ClampedArray( + this.module_.buffer, + this.renderingBuffer_, + this.imageData_.width * this.imageData_.height * 4)); + + this.context_.putImageData(this.imageData_, 0, 0); + } + } + + public Resize() { + if (this.imageData_ != null && + (this.imageData_.width != window.innerWidth || + this.imageData_.height != window.innerHeight)) { + this.imageData_ = null; + } + + // width/height can be defined in percent of window width/height through html attributes like data-width-ratio="50" and data-height-ratio="20" + var widthRatio = Number(this.htmlCanvas_.dataset["widthRatio"]) || 100; + var heightRatio = Number(this.htmlCanvas_.dataset["heightRatio"]) || 100; + + this.htmlCanvas_.width = window.innerWidth * (widthRatio / 100); + this.htmlCanvas_.height = window.innerHeight * (heightRatio / 100); + + console.log("resizing WasmViewport: ", this.htmlCanvas_.width, "x", this.htmlCanvas_.height); + + if (this.imageData_ === null) { + this.imageData_ = this.context_.getImageData(0, 0, this.htmlCanvas_.width, this.htmlCanvas_.height); + this.ViewportSetSize(this.pimpl_, this.htmlCanvas_.width, this.htmlCanvas_.height); + + if (this.renderingBuffer_ != null) { + this.module_._free(this.renderingBuffer_); + } + + this.renderingBuffer_ = this.module_._malloc(this.imageData_.width * this.imageData_.height * 4); + } + + this.Redraw(); + } + + public Initialize() { + + // Force the rendering of the viewport for the first time + this.Resize(); + + var that : WasmViewport = this; + // Register an event listener to call the Resize() function + // each time the window is resized. + window.addEventListener('resize', function(event) { + that.Resize(); + }, false); + + this.htmlCanvas_.addEventListener('contextmenu', function(event) { + // Prevent right click on the canvas + event.preventDefault(); + }, false); + + this.htmlCanvas_.addEventListener('mouseleave', function(event) { + that.ViewportMouseLeave(that.pimpl_); + }); + + this.htmlCanvas_.addEventListener('mouseenter', function(event) { + that.ViewportMouseEnter(that.pimpl_); + }); + + this.htmlCanvas_.addEventListener('mousedown', function(event) { + var x = event.pageX - this.offsetLeft; + var y = event.pageY - this.offsetTop; + that.ViewportMouseDown(that.pimpl_, event.button, x, y, 0 /* TODO */); + }); + + this.htmlCanvas_.addEventListener('mousemove', function(event) { + var x = event.pageX - this.offsetLeft; + var y = event.pageY - this.offsetTop; + that.ViewportMouseMove(that.pimpl_, x, y); + }); + + this.htmlCanvas_.addEventListener('mouseup', function(event) { + that.ViewportMouseUp(that.pimpl_); + }); + + window.addEventListener('keydown', function(event) { + that.ViewportKeyPressed(that.pimpl_, event.key, event.shiftKey, event.ctrlKey, event.altKey); + }); + + this.htmlCanvas_.addEventListener('wheel', function(event) { + var x = event.pageX - this.offsetLeft; + var y = event.pageY - this.offsetTop; + that.ViewportMouseWheel(that.pimpl_, event.deltaY, x, y, event.ctrlKey); + event.preventDefault(); + }); + + this.htmlCanvas_.addEventListener('touchstart', function(event) { + that.ResetTouch(); + }); + + this.htmlCanvas_.addEventListener('touchend', function(event) { + that.ResetTouch(); + }); + + this.htmlCanvas_.addEventListener('touchmove', function(event) { + if (that.touchTranslation_.length == 2) { + var t = that.GetTouchTranslation(event); + that.ViewportMouseMove(that.pimpl_, t[0], t[1]); + } + else if (that.touchZoom_.length == 3) { + var z0 = that.touchZoom_; + var z1 = that.GetTouchZoom(event); + that.ViewportMouseMove(that.pimpl_, z0[0], z0[1] - z0[2] + z1[2]); + } + else { + // Realize the gesture event + if (event.targetTouches.length == 1) { + // Exactly one finger inside the canvas => Setup a translation + that.touchTranslation_ = that.GetTouchTranslation(event); + that.ViewportMouseDown(that.pimpl_, + 1 /* middle button */, + that.touchTranslation_[0], + that.touchTranslation_[1], 0); + } else if (event.targetTouches.length == 2) { + // Exactly 2 fingers inside the canvas => Setup a pinch/zoom + that.touchZoom_ = that.GetTouchZoom(event); + var z0 = that.touchZoom_; + that.ViewportMouseDown(that.pimpl_, + 2 /* right button */, + z0[0], + z0[1], 0); + } + } + }); + } + + public ResetTouch() { + if (this.touchTranslation_ || + this.touchZoom_) { + this.ViewportMouseUp(this.pimpl_); + } + + this.touchTranslation_ = false; + this.touchZoom_ = false; + } + + public GetTouchTranslation(event) { + var touch = event.targetTouches[0]; + return [ + touch.pageX, + touch.pageY + ]; + } + + public GetTouchZoom(event) { + var touch1 = event.targetTouches[0]; + var touch2 = event.targetTouches[1]; + var dx = (touch1.pageX - touch2.pageX); + var dy = (touch1.pageY - touch2.pageY); + var d = Math.sqrt(dx * dx + dy * dy); + return [ + (touch1.pageX + touch2.pageX) / 2.0, + (touch1.pageY + touch2.pageY) / 2.0, + d + ]; + } + +} +} + \ No newline at end of file