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