Mercurial > hg > orthanc-stone

comparison Platforms/WebAssembly/wasm-viewport.ts @ 226:1fa4c65c7e1b am

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WasmViewport in ts
author am@osimis.io
date Thu, 14 Jun 2018 12:32:08 +0200
parents
children c8f11437a6fd
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225:930f98252ab9 226:1fa4c65c7e1b
1
2 module Stone {
3
4 // export declare type InitializationCallback = () => void;
5
6 // export declare var StoneFrameworkModule : any;
7
8 //const ASSETS_FOLDER : string = "assets/lib";
9 //const WASM_FILENAME : string = "orthanc-framework";
10
11 export class WasmViewport {
12
13 private module_ : any;
14 private canvasId_ : string;
15 private htmlCanvas_ : HTMLCanvasElement;
16 private context_ : CanvasRenderingContext2D;
17 private imageData_ : any = null;
18 private renderingBuffer_ : any = null;
19 private touchZoom_ : any = false;
20 private touchTranslation_ : any = false;
21
22 private ViewportSetSize : Function;
23 private ViewportRender : Function;
24 private ViewportMouseDown : Function;
25 private ViewportMouseMove : Function;
26 private ViewportMouseUp : Function;
27 private ViewportMouseEnter : Function;
28 private ViewportMouseLeave : Function;
29 private ViewportMouseWheel : Function;
30 private ViewportKeyPressed : Function;
31
32 public constructor(module: any, canvasId: string) {
33 this.module_ = module;
34 this.canvasId_ = canvasId;
35 this.htmlCanvas_ = document.getElementById(this.canvasId_) as HTMLCanvasElement;
36 this.context_ = this.htmlCanvas_.getContext('2d');
37
38 this.ViewportSetSize = this.module_.cwrap('ViewportSetSize', null, [ 'number', 'number' ]);
39 this.ViewportRender = this.module_.cwrap('ViewportRender', null, [ 'number', 'number', 'number', 'number' ]);
40 this.ViewportMouseDown = this.module_.cwrap('ViewportMouseDown', null, [ 'number', 'number', 'number', 'number' ]);
41 this.ViewportMouseMove = this.module_.cwrap('ViewportMouseMove', null, [ 'number', 'number' ]);
42 this.ViewportMouseUp = this.module_.cwrap('ViewportMouseUp', null, [ ]);
43 this.ViewportMouseEnter = this.module_.cwrap('ViewportMouseEnter', null, []);
44 this.ViewportMouseLeave = this.module_.cwrap('ViewportMouseLeave', null, []);
45 this.ViewportMouseWheel = this.module_.cwrap('ViewportMouseWheel', null, [ 'number', 'number', 'number', 'number' ]);
46 this.ViewportKeyPressed = this.module_.cwrap('ViewportKeyPressed', null, [ 'string', 'number', 'number' ]);
47 }
48
49 public Redraw() {
50 if (this.imageData_ === null ||
51 this.renderingBuffer_ === null ||
52 this.ViewportRender(this.imageData_.width,
53 this.imageData_.height,
54 this.renderingBuffer_) == 0) {
55 console.log('The rendering has failed');
56 } else {
57 // Create an accessor to the rendering buffer (i.e. create a
58 // "window" above the heap of the WASM module), then copy it to
59 // the ImageData object
60 this.imageData_.data.set(new Uint8ClampedArray(
61 this.module_.buffer,
62 this.renderingBuffer_,
63 this.imageData_.width * this.imageData_.height * 4));
64
65 this.context_.putImageData(this.imageData_, 0, 0);
66 }
67 }
68
69 public Resize() {
70 if (this.imageData_ != null &&
71 (this.imageData_.width != window.innerWidth ||
72 this.imageData_.height != window.innerHeight)) {
73 this.imageData_ = null;
74 }
75
76 this.htmlCanvas_.width = window.innerWidth;
77 this.htmlCanvas_.height = window.innerHeight;
78
79 if (this.imageData_ === null) {
80 this.imageData_ = this.context_.getImageData(0, 0, this.htmlCanvas_.width, this.htmlCanvas_.height);
81 this.ViewportSetSize(this.htmlCanvas_.width, this.htmlCanvas_.height);
82
83 if (this.renderingBuffer_ != null) {
84 this.module_._free(this.renderingBuffer_);
85 }
86
87 this.renderingBuffer_ = this.module_._malloc(this.imageData_.width * this.imageData_.height * 4);
88 }
89
90 this.Redraw();
91 }
92
93 public Initialize() {
94
95 // Force the rendering of the viewport for the first time
96 this.Resize();
97
98 // Register an event listener to call the Resize() function
99 // each time the window is resized.
100 window.addEventListener('resize', this.Resize, false);
101
102 var that = this;
103
104 this.htmlCanvas_.addEventListener('contextmenu', function(event) {
105 // Prevent right click on the canvas
106 event.preventDefault();
107 }, false);
108
109 this.htmlCanvas_.addEventListener('mouseleave', function(event) {
110 that.ViewportMouseLeave();
111 });
112
113 this.htmlCanvas_.addEventListener('mouseenter', function(event) {
114 that.ViewportMouseEnter();
115 });
116
117 this.htmlCanvas_.addEventListener('mousedown', function(event) {
118 var x = event.pageX - this.offsetLeft;
119 var y = event.pageY - this.offsetTop;
120 that.ViewportMouseDown(event.button, x, y, 0 /* TODO */);
121 });
122
123 this.htmlCanvas_.addEventListener('mousemove', function(event) {
124 var x = event.pageX - this.offsetLeft;
125 var y = event.pageY - this.offsetTop;
126 that.ViewportMouseMove(x, y);
127 });
128
129 this.htmlCanvas_.addEventListener('mouseup', function(event) {
130 that.ViewportMouseUp();
131 });
132
133 window.addEventListener('keydown', function(event) {
134 that.ViewportKeyPressed(event.key, event.shiftKey, event.ctrlKey, event.altKey);
135 });
136
137 this.htmlCanvas_.addEventListener('wheel', function(event) {
138 var x = event.pageX - this.offsetLeft;
139 var y = event.pageY - this.offsetTop;
140 that.ViewportMouseWheel(event.deltaY, x, y, event.ctrlKey);
141 event.preventDefault();
142 });
143
144 var that = this;
145 this.htmlCanvas_.addEventListener('touchstart', function(event) {
146 that.ResetTouch();
147 });
148
149 this.htmlCanvas_.addEventListener('touchend', function(event) {
150 that.ResetTouch();
151 });
152
153 this.htmlCanvas_.addEventListener('touchmove', function(event) {
154 if (that.touchTranslation_.length == 2) {
155 var t = that.GetTouchTranslation(event);
156 that.ViewportMouseMove(t[0], t[1]);
157 }
158 else if (that.touchZoom_.length == 3) {
159 var z0 = that.touchZoom_;
160 var z1 = that.GetTouchZoom(event);
161 that.ViewportMouseMove(z0[0], z0[1] - z0[2] + z1[2]);
162 }
163 else {
164 // Realize the gesture event
165 if (event.targetTouches.length == 1) {
166 // Exactly one finger inside the canvas => Setup a translation
167 that.touchTranslation_ = that.GetTouchTranslation(event);
168 that.ViewportMouseDown(1 /* middle button */,
169 that.touchTranslation_[0],
170 that.touchTranslation_[1], 0);
171 } else if (event.targetTouches.length == 2) {
172 // Exactly 2 fingers inside the canvas => Setup a pinch/zoom
173 that.touchZoom_ = that.GetTouchZoom(event);
174 var z0 = that.touchZoom_;
175 that.ViewportMouseDown(2 /* right button */,
176 z0[0],
177 z0[1], 0);
178 }
179 }
180 });
181 }
182
183 public ResetTouch() {
184 if (this.touchTranslation_ ||
185 this.touchZoom_) {
186 this.ViewportMouseUp();
187 }
188
189 this.touchTranslation_ = false;
190 this.touchZoom_ = false;
191 }
192
193 public GetTouchTranslation(event) {
194 var touch = event.targetTouches[0];
195 return [
196 touch.pageX,
197 touch.pageY
198 ];
199 }
200
201 public GetTouchZoom(event) {
202 var touch1 = event.targetTouches[0];
203 var touch2 = event.targetTouches[1];
204 var dx = (touch1.pageX - touch2.pageX);
205 var dy = (touch1.pageY - touch2.pageY);
206 var d = Math.sqrt(dx * dx + dy * dy);
207 return [
208 (touch1.pageX + touch2.pageX) / 2.0,
209 (touch1.pageY + touch2.pageY) / 2.0,
210 d
211 ];
212 }
213
214 }
215 }
216