mgcanvas/mgcanvas.js

   1
   2 function MGCanvas(canvasDOMObj){
   3         var that = this;
   4
   5         this.initGraphicContext(canvasDOMObj);
   6         this.tickPerSecond = 30;
   7         this.tickCount = 0;
   8         this.tickTimer = window.setInterval(function(){ that.tick(); }, 1000 / this.tickPerSecond);
   9         this.isPaused = false;
  10         this.isEnabledAutomaticTracking = true;
  11         this.nodeList = new Array();
  12         this.edgeList = new Array();
  13         this.selectedNode = null;
  14         this.selectedEdge = null;
  15         this.srcMemoryDB = null;
  16         this.srcMemoryDBSyncPerTick = 60;
  17         this.srcMemoryDBSyncCount = this.srcMemoryDBSyncPerTick;
  18
  19         var that = this;
  20         window.addEventListener('keydown', function(event){
  21                 switch(event.keyCode){
  22                         case 37:        //左カーソル
  23                                 that.moveViewRelative(-10, 0);
  24                                 break;
  25                         case 39:        //右カーソル
  26                                 that.moveViewRelative(10, 0);
  27                                 break;
  28                         case 38:        //上カーソル
  29                                 that.moveViewRelative(0, -10);
  30                                 break;
  31                         case 40:        //下カーソル
  32                                 that.moveViewRelative(0, 10);
  33                                 break;
  34                 }
  35         }, true);
  36
  37         this.isMouseDown = false;
  38         this.mouseDownPosition = new Point2D(0, 0);
  39         this.lastMousePosition = new Point2D(0, 0);
  40         this.canvas.onmousemove = function (e){
  41                 if(that.isMouseDown){
  42                         if(!e){
  43                                 //for IE
  44                                 e = window.event;
  45                         }
  46                         that.lastMousePosition = that.getMousePositionOnElement(e);
  47                 }
  48         };
  49         this.canvas.onmousedown = function (e){
  50                 if(!e){
  51                         //for IE
  52                         e = window.event;
  53                 }
  54                 that.lastMousePosition = that.getMousePositionOnElement(e);
  55                 that.mouseDownPosition = that.lastMousePosition;
  56                 var p = that.convertPointToGraphLayerFromCanvasLayerP(that.lastMousePosition);
  57                 //console.log(p.x + "," + p.y);
  58                 var node = that.getNodeAtPointP(p);
  59                 that.selectNode(node);
  60                 var edge = that.getEdgeAtPointP(p);
  61                 that.selectEdge(edge);
  62                 that.isMouseDown = true;
  63                 that.isEnabledAutomaticTracking = false;
  64         };
  65         this.canvas.onmouseup = function (e){
  66                 that.isMouseDown = false;
  67         };
  68 }
  69 MGCanvas.prototype = {
  70         setGraph: function(gArray){
  71                 //gArray = [[Node1, Node2, Node3, ...], [[Node1, Node3], [Node3, Node2], ...]]
  72                 var that = this;
  73                 var p = gArray[0];
  74                 var n = function(identifier){ return that.nodeList.isIncluded(identifier, function(a, b){ return (a.identifier == b); }); };
  75
  76                 for(var i = 0, iLen = p.length; i < iLen; i++){
  77                         this.nodeList.push(new MGNode(this, p[i]));
  78                 }
  79
  80                 p = gArray[1];
  81                 for(var i = 0, iLen = p.length; i < iLen; i++){
  82                         this.edgeList.push(new MGEdge(this, p[i][2], n(p[i][0]), n(p[i][1])));
  83                 }
  84         },
  85         setSourceMemoryDB: function(mdb){
  86                 var that = this;
  87                 this.srcMemoryDB = mdb;
  88                 mdb.callback_refreshedNode = function(t){
  89                         var n;
  90                         n = new MGNode(that, t.identifier);
  91                         that.nodeList.push(n);
  92                 }
  93         },
  94         bringToCenter: function(){
  95                 // 重心を求めて、それを表示オフセットに設定する
  96                 var g = new Point2D(0, 0);
  97                 var p;
  98                 p = this.nodeList;
  99                 for(var i = 0, iLen = p.length; i < iLen; i++){
 100                         g.x += p[i].position.x;
 101                         g.y += p[i].position.y;
 102                 }
 103                 g.x /= p.length;
 104                 g.y /= p.length;
 105
 106                 this.positionOffset.x = -g.x;
 107                 this.positionOffset.y = -g.y;
 108
 109                 this.isEnabledAutomaticTracking = true;
 110         },
 111         zoomIn: function(){
 112                 this.context.scale(2, 2);
 113                 this.currentScale *= 2;
 114         },
 115         zoomOut: function(){
 116                 this.context.scale(0.5, 0.5);
 117                 this.currentScale *= 0.5;
 118         },
 119         moveViewRelative: function(x, y){
 120                 this.positionOffset.x += -x;
 121                 this.positionOffset.y += -y;
 122         },
 123         bringInScreen: function(){
 124                 //大きく外れていないときには動かさない
 125                 var g = new Point2D(0, 0);
 126                 var f = new Point2D(0, 0);
 127                 var p;
 128                 p = this.nodeList;
 129                 for(var i = 0, iLen = p.length; i < iLen; i++){
 130                         g.x += p[i].position.x;
 131                         g.y += p[i].position.y;
 132                 }
 133                 g.x /= p.length;
 134                 g.y /= p.length;
 135                 g.x += this.positionOffset.x;
 136                 g.y += this.positionOffset.y;
 137                 if(     g.x < this.displayRect.origin.x / 2 ||
 138                         g.x > -this.displayRect.origin.x / 2 ||
 139                         g.y < this.displayRect.origin.y / 2 ||
 140                         g.y > -this.displayRect.origin.x / 2){
 141
 142                         this.positionOffset.x += -g.x;
 143                         this.positionOffset.y += -g.y;
 144                 }
 145         },
 146         tick: function(){
 147                 var p;
 148                 var t;
 149                 var dr;
 150                 var n = null;
 151                 var nMax = 0;
 152                 var nTemp;
 153
 154                 this.tickCount++;
 155                 this.srcMemoryDBSyncCount++;
 156
 157                 //
 158                 // Sync
 159                 //
 160                 if(this.srcMemoryDB && this.srcMemoryDBSyncCount > this.srcMemoryDBSyncPerTick){
 161                         this.srcMemoryDB.syncDB();
 162                         this.srcMemoryDBSyncCount = 0;
 163                 }
 164
 165                 //
 166                 // AutomaticTracking
 167                 //
 168                 if(this.isEnabledAutomaticTracking && (this.tickCount % 30 == 0)){
 169                         this.bringInScreen();
 170                 }
 171
 172
 173                 //
 174                 // View moving with mouse
 175                 //
 176                 if(this.isMouseDown){
 177                         this.moveViewRelative(
 178                                 (this.mouseDownPosition.x - this.lastMousePosition.x) * 4 / this.tickPerSecond,
 179                                 (this.mouseDownPosition.y - this.lastMousePosition.y) * 4 / this.tickPerSecond
 180                         );
 181                 }
 182
 183                 if(!this.isPaused){
 184                         //
 185                         // Check
 186                         //
 187                         /*
 188                         p = this.nodeList;
 189                         for(var i = 0, iLen = p.length; i < iLen; i++){
 190                                 nTemp = this.getVectorLength(p[i].vector);
 191                                 if(nMax < nTemp){
 192                                         n = p[i];
 193                                         nMax = nTemp;
 194                                 }
 195                         }
 196                         if(n){
 197                                 n.ignoreEdgeRepulsion = 10;
 198                         }
 199                         */
 200
 201                         //
 202                         // Move
 203                         //
 204                         p = this.nodeList;
 205                         for(var i = 0, iLen = p.length; i < iLen; i++){
 206                                 this.nodeList[i].tick();
 207                         }
 208                         p = this.edgeList;
 209                         for(var i = 0, iLen = p.length; i < iLen; i++){
 210                                 this.edgeList[i].tick();
 211                         }
 212                 }
 213
 214                 //
 215                 // Refresh
 216                 //
 217                 dr = this.displayRect;
 218
 219                 this.context.scale(1 / this.currentScale, 1 / this.currentScale);
 220                 this.context.clearRect(dr.origin.x, dr.origin.y, dr.size.x, dr.size.y);
 221                 this.context.scale(this.currentScale, this.currentScale);
 222
 223                 this.context.translate(this.positionOffset.x, this.positionOffset.y);
 224
 225                 p = this.nodeList;
 226                 for(var i = 0, iLen = p.length; i < iLen; i++){
 227                         this.nodeList[i].draw();
 228                 }
 229
 230                 p = this.edgeList;
 231                 for(var i = 0, iLen = p.length; i < iLen; i++){
 232                         this.edgeList[i].draw();
 233                 }
 234
 235                 this.context.translate(-this.positionOffset.x, -this.positionOffset.y);
 236
 237         },
 238         getMousePositionOnElement: function(e){
 239                 // http://tmlife.net/programming/javascript/javascript-mouse-pos.html
 240                 // retv:
 241                 var retv = new Object();
 242                 var rect = e.target.getBoundingClientRect();
 243                 retv.x = e.clientX - rect.left;
 244                 retv.y = e.clientY - rect.top;
 245                 return retv;
 246         },
 247         fillRect: function(x, y, w, h){
 248                 var d = this.drawCoordinatesInInteger;
 249                 this.context.fillRect(d(x), d(y), d(w), d(h));
 250         },
 251         strokeRect: function(x, y, w, h){
 252                 var d = this.drawCoordinatesInInteger;
 253                 this.context.strokeRect(d(x), d(y), d(w), d(h));
 254         },
 255         drawCoordinatesInInteger: function(coordinateElement){
 256                 //from http://www.html5rocks.com/ja/tutorials/canvas/performance/
 257                 // With a bitwise or.
 258                 return ((0.5 + coordinateElement) | 0);
 259         },
 260         drawCircle: function(x, y, r){
 261                 var d = this.drawCoordinatesInInteger;
 262                 this.context.beginPath();
 263                 this.context.arc(d(x), d(y), d(r), 0, 2 * Math.PI);
 264                 this.context.closePath();
 265                 this.context.fill();
 266                 this.context.stroke();
 267         },
 268         drawLineP: function(p, q){
 269                 var d = this.drawCoordinatesInInteger;
 270                 this.context.beginPath();
 271                 this.context.moveTo(d(p.x), d(p.y));
 272                 this.context.lineTo(d(q.x), d(q.y));
 273                 this.context.closePath();
 274                 this.context.stroke();
 275         },
 276         drawText: function(text, x, y){
 277                 //背景をfillStyle
 278                 //前景をstrokeStyleで塗りつぶした文字列を描画する
 279                 //塗りつぶし高さは20px固定
 280                 //座標は文字列の左上の座標となる
 281                 var textsize = this.context.measureText(text);
 282                 this.context.fillRect(x, y, textsize.width, 20);
 283                 this.context.save();
 284                 this.context.fillStyle = this.context.strokeStyle;
 285                 //fillText引数の座標は文字列の左下！
 286                 this.context.fillText(text, x, y + 20 - 1);
 287                 this.context.restore();
 288         },
 289         getVectorLengthP: function(p, q){
 290                 return this.getVectorLength(this.getVectorP(p, q));
 291         },
 292         getVectorLength: function(a){
 293                 return Math.sqrt(a.x * a.x + a.y * a.y);
 294         },
 295         getVectorP: function(p, q){
 296                 return new Point2D(q.x - p.x, q.y - p.y);
 297         },
 298         getUnitVectorP: function(p, q){
 299                 var e = this.getVectorP(p, q);
 300                 return this.getUnitVector(e);
 301         },
 302         getUnitVector: function(a){
 303                 var l = Math.sqrt(a.x * a.x + a.y * a.y);
 304                 a.x /= l;
 305                 a.y /= l;
 306                 return a;
 307         },
 308         getNormalUnitVectorSideOfP: function(a, b, p){
 309                 //直線ab上にない点pが存在する側へ向かう単位法線ベクトルを返す。
 310                 return this.getUnitVector(this.getNormalVectorSideOfP(a, b, p));
 311         },
 312         getNormalVectorSideOfP: function(a, b, p){
 313                 //直線ab上にない点pが存在する側へ向かう法線ベクトルを返す。
 314                 //pがab上にある場合は零ベクトルとなる。
 315                 var n = this.getVectorP(a, b);
 316                 var t = n.x;
 317                 var i;
 318                 n.x = -n.y;
 319                 n.y = t;
 320
 321                 i = this.getInnerVector2D(n, this.getVectorP(a, p));
 322                 if(i < 0){
 323                         //この法線ベクトルとapの向きが逆なので反転する。
 324                         n.x = -n.x;
 325                         n.y = -n.y;
 326                 } else if(i == 0){
 327                         n.x = 0;
 328                         n.y = 0;
 329                 }
 330                 return n;
 331         },
 332         getExteriorVector2D: function(a, b){
 333                 return a.x * b.y - a.y * b.x;
 334         },
 335         getInnerVector2D: function(a, b){
 336                 return a.x * b.x + a.y * b.y;
 337         },
 338         getDistanceDotAndLineP: function(p, a, b){
 339                 // http://www.sousakuba.com/Programming/gs_dot_line_distance.html
 340                 var ab;
 341                 var ap;
 342                 var s;
 343                 var l;
 344                 var d;
 345
 346                 ab = this.getVectorP(a, b);
 347                 ap = this.getVectorP(a, p);
 348
 349                 s = Math.abs(this.getExteriorVector2D(ab, ap));
 350                 l = this.getVectorLengthP(a, b);
 351                 d = (s / l);
 352
 353                 s = this.getInnerVector2D(ap, ab);
 354                 if(s < 0){
 355                         //線分の範囲外なので端点aからの距離に変換
 356                         //端点から垂線の足までの距離
 357                         l = - (s / l);
 358                         d = Math.sqrt(d * d + l * l);
 359                 } else if(s > l * l){
 360                         //同様に端点bからの距離に変換
 361                         l = s / l;
 362                         d = Math.sqrt(d * d + l * l);
 363                 }
 364                 return d;
 365         },
 366         initGraphicContext: function(newCanvas){
 367                 this.canvas = newCanvas;
 368                 this.context = this.canvas.getContext('2d');
 369                 this.context.fillStyle = "rgba(255,255,255,0.5)";
 370                 this.context.strokeStyle = "rgba(0, 0, 0, 1)";
 371                 this.context.font = "normal 20px sans-serif";
 372                 var w = this.canvas.width / 2;
 373                 var h = this.canvas.height / 2;
 374                 this.context.translate(w, h);
 375                 this.displayRect = new Rectangle(-w, -h, this.canvas.width, this.canvas.height);
 376                 this.currentScale = 1;
 377                 this.zoomOut();
 378                 this.positionOffset = new Point2D(0, 0);
 379         },
 380         convertPointToGraphLayerFromCanvasLayerP: function(pCanvas){
 381                 var p = new Point2D(pCanvas.x, pCanvas.y);
 382                 // Canvasの中心が原点
 383                 p.x -= this.canvas.width / 2;
 384                 p.y -= this.canvas.height / 2;
 385                 // スケール変換
 386                 p.x /= this.currentScale;
 387                 p.y /= this.currentScale;
 388
 389                 // オフセット平行移動
 390                 p.x -= this.positionOffset.x;
 391                 p.y -= this.positionOffset.y;
 392
 393                 return p;
 394         },
 395         getNodeAtPointP: function(p){
 396                 var r = new Rectangle(p.x - 10, p.y - 10, 20, 20);
 397
 398                 var nl = this.nodeList;
 399                 for(var i = 0, iLen = nl.length; i < iLen; i++){
 400                         if(r.isIncludePointP(nl[i].position)){
 401                                 return nl[i];
 402                         }
 403                 }
 404                 return null;
 405         },
 406         getEdgeAtPointP: function(p){
 407                 var r = new Rectangle(p.x - 10, p.y - 10, 20, 20);
 408
 409                 var el = this.edgeList;
 410                 for(var i = 0, iLen = el.length; i < iLen; i++){
 411                         if(r.isIncludePointP(el[i].centerPoint)){
 412                                 return el[i];
 413                         }
 414                 }
 415                 return null;
 416         },
 417         selectNode: function(node){
 418                 if(this.selectedNode){
 419                         this.selectedNode.isSelected = false;
 420                 }
 421                 if(node){
 422                         node.isSelected = true;
 423                 }
 424                 this.selectedNode = node;
 425         },
 426         selectEdge: function(edge){
 427                 if(this.selectedEdge){
 428                         this.selectedEdge.isSelected = false;
 429                 }
 430                 if(edge){
 431                         edge.isSelected = true;
 432                 }
 433                 this.selectedEdge = edge;
 434         },
 435         setIdentifierForSelectedNode: function(str){
 436                 if(this.selectedNode){
 437                         this.selectedNode.identifier = str;
 438                 }
 439         },
 440 }
 441
 442 function MGNode(env, identifier){
 443         this.env = env;
 444         this.identifier = identifier;
 445         this.position = new Point2D(Math.random() * 32 - 16, Math.random() * 32 - 16);
 446         this.size = 10;
 447         //ランダムな初期ベクトルをもつ。
 448         this.vector = new Point2D(Math.random() * 2 - 1, Math.random() * 2 - 1);
 449         this.friction = 50 / 100;
 450         this.repulsionLengthNode = 90;
 451         this.repulsionLengthEdge = 90;
 452         this.ignoreEdgeRepulsion = 0;
 453         //
 454         this.strokeStyle = "rgba(0, 0, 0, 1)";
 455         this.isSelected = false;
 456 }
 457 MGNode.prototype = {
 458         draw: function(){
 459                 if(this.isSelected){
 460                         this.env.context.strokeStyle = "rgba(255, 0, 0, 1)";
 461                 } else{
 462                         this.env.context.strokeStyle = this.strokeStyle;
 463                 }
 464                 this.env.drawCircle(this.position.x, this.position.y, this.size);
 465                 if(this.identifier){
 466                         this.env.drawText(this.identifier.toString(), this.position.x + 10, this.position.y + 10);
 467                 }
 468         },
 469         tick: function(){
 470                 var e;
 471                 var p;
 472                 var l;
 473                 var q;
 474                 this.position.x += this.vector.x;
 475                 this.position.y += this.vector.y;
 476                 this.vector.x *= this.friction;
 477                 this.vector.y *= this.friction;
 478
 479                 if(!this.ignoreEdgeRepulsion){
 480                         //node
 481                         //距離の近い点同士には斥力が働くとする。
 482                         p = this.env.nodeList;
 483                         for(var i = 0, iLen = p.length; i < iLen; i++){
 484                                 var q = this.env.nodeList[i];
 485                                 if(q != this){
 486                                         l = this.env.getVectorLengthP(this.position, q.position);
 487                                         if(l < this.repulsionLengthNode && l != 0){
 488                                                 e = this.env.getUnitVectorP(q.position, this.position);
 489                                                 e.x *= this.repulsionLengthNode / l;
 490                                                 e.y *= this.repulsionLengthNode / l;
 491                                                 this.vector.x += e.x;
 492                                                 this.vector.y += e.y;
 493                                         }
 494                                 }
 495                         }
 496
 497                         //edge
 498                         //自分を端点に含まないエッジとの距離が近い場合、そのエッジから遠ざかろうとする。
 499                         /*
 500                         p = this.env.edgeList;
 501                         for(var i = 0, iLen = p.length; i < iLen; i++){
 502                                 var q = this.env.edgeList[i];
 503                                 if(q.node0 != this && q.node1 != this){
 504                                         l = this.env.getDistanceDotAndLineP(this.position, q.node0.position, q.node1.position);
 505                                         if(l < this.repulsionLengthEdge && l != 0){
 506                                                 if(l < 1){
 507                                                         l = 1;
 508                                                 }
 509                                                 e = this.env.getNormalUnitVectorSideOfP(q.node0.position, q.node1.position, this.position);
 510                                                 e.x *= this.repulsionLengthEdge / l;
 511                                                 e.y *= this.repulsionLengthEdge / l;
 512                                                 this.vector.x += e.x;
 513                                                 this.vector.y += e.y;
 514                                                 q.node0.vector.x -= e.x / 2;
 515                                                 q.node0.vector.y -= e.y / 2;
 516                                                 q.node1.vector.x -= e.x / 2;
 517                                                 q.node1.vector.y -= e.y / 2;
 518                                         }
 519                                 }
 520                         }
 521                         */
 522                 } else{
 523                         this.ignoreEdgeRepulsion--;
 524                 }
 525
 526         },
 527 }
 528
 529 function MGEdge(env, identifier, node0, node1){
 530         this.env = env;
 531         this.identifier = identifier;
 532         this.node0 = node0;
 533         this.node1 = node1;
 534         this.freeLength = 250;
 535         //
 536         this.strokeStyle = "rgba(0, 0, 0, 0.5)";
 537         this.isSelected = false;
 538         //
 539         this.centerPoint = new Point2D(0, 0);
 540 }
 541 MGEdge.prototype = {
 542         draw: function(){
 543                 if(this.isSelected){
 544                         this.env.context.strokeStyle = "rgba(255, 0, 0, 1)";
 545                 } else{
 546                         this.env.context.strokeStyle = this.strokeStyle;
 547                 }
 548                 if(this.node0 && this.node1){
 549                         this.drawCurvedLineP(this.node0.position, this.node1.position);
 550                         this.env.strokeRect(this.centerPoint.x - 8, this.centerPoint.y - 8, 16, 16);
 551                         if(this.identifier){
 552                                 this.env.drawText(this.identifier.toString(), this.centerPoint.x, this.centerPoint.y);
 553                         }
 554                 }
 555         },
 556         tick: function(){
 557                 var l = this.env.getVectorLengthP(this.node0.position, this.node1.position);
 558                 var e;
 559                 if(l > this.freeLength){
 560                         e = this.env.getUnitVectorP(this.node0.position, this.node1.position);
 561                         e.x *= l / this.freeLength;
 562                         e.y *= l / this.freeLength;
 563                         this.node0.vector.x += e.x;
 564                         this.node0.vector.y += e.y;
 565                         this.node1.vector.x -= e.x;
 566                         this.node1.vector.y -= e.y;
 567                 }
 568                 this.centerPoint = new Point2D((this.node0.position.x + this.node1.position.x) / 2, (this.node0.position.y + this.node1.position.y) / 2);
 569         },
 570         drawCurvedLineP: function(p, q){
 571                 var that = this;
 572                 var d = function(x){ return that.env.drawCoordinatesInInteger(x); };
 573                 var v = this.env.getUnitVectorP(p, q);
 574                 var w = new Point2D(-(v.y * 50), v.x * 50);
 575                 this.env.context.beginPath();
 576                 this.env.context.moveTo(d(p.x), d(p.y));
 577                 this.env.context.bezierCurveTo(d(this.centerPoint.x + w.x), d(this.centerPoint.y + w.y), d(this.centerPoint.x - w.x), d(this.centerPoint.y - w.y), d(q.x), d(q.y));
 578                 //this.env.context.closePath();
 579                 this.env.context.stroke();
 580         },
 581 }
 582
 583 function Point2D(x, y){
 584         this.x = x;
 585         this.y = y;
 586 }
 587 Point2D.prototype = {
 588
 589 }
 590
 591 function Rectangle(x, y, width, height){
 592         this.origin = new Point2D(x,y);
 593         this.size = new Point2D(width,height);
 594 }
 595 Rectangle.prototype = {
 596         isIncludePointP: function(p){
 597                 return  (this.origin.x <= p.x) && (p.x <= this.origin.x + this.size.x) &&
 598                                 (this.origin.y <= p.y) && (p.y <= this.origin.y + this.size.y);
 599         },
 600 }
 601