mgcanvas/mgcanvas.js

   1 //文字列をキーとする。
   2
   3 //まず、最も多数のエッジを持つノードを探す。
   4 //それを起点にして、エッジをたどる。
   5
   6 function MGCanvas(canvasDOMObj){
   7         var that = this;
   8
   9         this.initGraphicContext(canvasDOMObj);
  10         this.tickPerSecond = 30;
  11         this.tickCount = 0;
  12         this.tickTimer = window.setInterval(function(){ that.tick(); }, 1000 / this.tickPerSecond);
  13         this.nodeList = new Array();
  14         this.edgeList = new Array();
  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                 if(node){
  57                         node.isSelected = true;
  58                 }
  59                 that.isMouseDown = true;
  60         };
  61         this.canvas.onmouseup = function (e){
  62                 that.isMouseDown = false;
  63         };
  64 }
  65 MGCanvas.prototype = {
  66         setGraph: function(gArray){
  67                 //gArray = [[Node1, Node2, Node3, ...], [[Node1, Node3], [Node3, Node2], ...]]
  68                 var that = this;
  69                 var p = gArray[0];
  70                 var n = function(identifier){ return that.nodeList.isIncluded(identifier, function(a, b){ return (a.identifier == b); }); };
  71
  72                 for(var i = 0, iLen = p.length; i < iLen; i++){
  73                         this.nodeList.push(new MGNode(this, p[i]));
  74                 }
  75
  76                 p = gArray[1];
  77                 for(var i = 0, iLen = p.length; i < iLen; i++){
  78                         this.edgeList.push(new MGEdge(this, p[i][2], n(p[i][0]), n(p[i][1])));
  79                 }
  80         },
  81         bringToCenter: function(){
  82                 // 重心を求めて、それを表示オフセットに設定する
  83                 var g = new Point2D(0, 0);
  84                 var p;
  85                 p = this.nodeList;
  86                 for(var i = 0, iLen = p.length; i < iLen; i++){
  87                         g.x += p[i].position.x;
  88                         g.y += p[i].position.y;
  89                 }
  90                 g.x /= p.length;
  91                 g.y /= p.length;
  92
  93                 this.positionOffset.x = -g.x;
  94                 this.positionOffset.y = -g.y;
  95         },
  96         zoomIn: function(){
  97                 this.context.scale(2, 2);
  98                 this.currentScale *= 2;
  99         },
 100         zoomOut: function(){
 101                 this.context.scale(0.5, 0.5);
 102                 this.currentScale *= 0.5;
 103         },
 104         moveViewRelative: function(x, y){
 105                 this.positionOffset.x += -x;
 106                 this.positionOffset.y += -y;
 107         },
 108         /*
 109         bringInScreen: function(){
 110                 //大きく外れていないときには動かさない
 111                 var g = new Point2D(0, 0);
 112                 var p;
 113                 p = this.nodeList;
 114                 for(var i = 0, iLen = p.length; i < iLen; i++){
 115                         g.x += p[i].position.x;
 116                         g.y += p[i].position.y;
 117                 }
 118                 g.x /= p.length;
 119                 g.y /= p.length;
 120                 if(     g.x < this.displayRect.origin.x / 2 ||
 121                         g.x > -this.displayRect.origin.x / 2 ||
 122                         g.y < this.displayRect.origin.y / 2 ||
 123                         g.y > -this.displayRect.origin.x / 2){
 124
 125                         this.positionOffset.x = -g.x;
 126                         this.positionOffset.y = -g.y;
 127                 }
 128         },
 129         */
 130         tick: function(){
 131                 var p;
 132                 var t;
 133                 var dr;
 134                 var n = null;
 135                 var nMax = 0;
 136                 var nTemp;
 137
 138                 this.tickCount++;
 139
 140                 //
 141                 // View moving with mouse
 142                 //
 143                 if(this.isMouseDown){
 144                         this.moveViewRelative(
 145                                 (this.mouseDownPosition.x - this.lastMousePosition.x) * 4 / this.tickPerSecond,
 146                                 (this.mouseDownPosition.y - this.lastMousePosition.y) * 4 / this.tickPerSecond
 147                         );
 148                 }
 149
 150                 //
 151                 // Check
 152                 //
 153
 154                 p = this.nodeList;
 155                 for(var i = 0, iLen = p.length; i < iLen; i++){
 156                         nTemp = this.getVectorLength(p[i].vector);
 157                         if(nMax < nTemp){
 158                                 n = p[i];
 159                                 nMax = nTemp;
 160                         }
 161                 }
 162                 if(n){
 163                         n.ignoreEdgeRepulsion = 10;
 164                 }
 165
 166
 167                 //
 168                 // Move
 169                 //
 170                 p = this.nodeList;
 171                 for(var i = 0, iLen = p.length; i < iLen; i++){
 172                         this.nodeList[i].tick();
 173                 }
 174                 p = this.edgeList;
 175                 for(var i = 0, iLen = p.length; i < iLen; i++){
 176                         this.edgeList[i].tick();
 177                 }
 178
 179                 //
 180                 // Refresh
 181                 //
 182                 dr = this.displayRect;
 183
 184                 this.context.scale(1 / this.currentScale, 1 / this.currentScale);
 185                 this.context.clearRect(dr.origin.x, dr.origin.y, dr.size.x, dr.size.y);
 186                 this.context.scale(this.currentScale, this.currentScale);
 187
 188                 this.context.translate(this.positionOffset.x, this.positionOffset.y);
 189
 190                 p = this.nodeList;
 191                 for(var i = 0, iLen = p.length; i < iLen; i++){
 192                         this.nodeList[i].draw();
 193                 }
 194
 195                 p = this.edgeList;
 196                 for(var i = 0, iLen = p.length; i < iLen; i++){
 197                         this.edgeList[i].draw();
 198                 }
 199
 200                 this.context.translate(-this.positionOffset.x, -this.positionOffset.y);
 201
 202         },
 203         getMousePositionOnElement: function(e){
 204                 // http://tmlife.net/programming/javascript/javascript-mouse-pos.html
 205                 // retv:
 206                 var retv = new Object();
 207                 var rect = e.target.getBoundingClientRect();
 208                 retv.x = e.clientX - rect.left;
 209                 retv.y = e.clientY - rect.top;
 210                 return retv;
 211         },
 212         fillRect: function(x, y, w, h){
 213                 var d = this.drawCoordinatesInInteger;
 214                 this.context.fillRect(d(x), d(y), d(w), d(h));
 215         },
 216         strokeRect: function(x, y, w, h){
 217                 var d = this.drawCoordinatesInInteger;
 218                 this.context.strokeRect(d(x), d(y), d(w), d(h));
 219         },
 220         drawCoordinatesInInteger: function(coordinateElement){
 221                 //from http://www.html5rocks.com/ja/tutorials/canvas/performance/
 222                 // With a bitwise or.
 223                 return ((0.5 + coordinateElement) | 0);
 224         },
 225         drawCircle: function(x, y, r){
 226                 var d = this.drawCoordinatesInInteger;
 227                 this.context.beginPath();
 228                 this.context.arc(d(x), d(y), d(r), 0, 2 * Math.PI);
 229                 this.context.closePath();
 230                 this.context.fill();
 231                 this.context.stroke();
 232         },
 233         drawLineP: function(p, q){
 234                 var d = this.drawCoordinatesInInteger;
 235                 this.context.beginPath();
 236                 this.context.moveTo(d(p.x), d(p.y));
 237                 this.context.lineTo(d(q.x), d(q.y));
 238                 this.context.closePath();
 239                 this.context.stroke();
 240         },
 241         drawText: function(text, x, y){
 242                 //背景をfillStyle
 243                 //前景をstrokeStyleで塗りつぶした文字列を描画する
 244                 //塗りつぶし高さは20px固定
 245                 //座標は文字列の左上の座標となる
 246                 var textsize = this.context.measureText(text);
 247                 this.context.fillRect(x, y, textsize.width, 20);
 248                 this.context.save();
 249                 this.context.fillStyle = this.context.strokeStyle;
 250                 //fillText引数の座標は文字列の左下！
 251                 this.context.fillText(text, x, y + 20 - 1);
 252                 this.context.restore();
 253         },
 254         getVectorLengthP: function(p, q){
 255                 return this.getVectorLength(this.getVectorP(p, q));
 256         },
 257         getVectorLength: function(a){
 258                 return Math.sqrt(a.x * a.x + a.y * a.y);
 259         },
 260         getVectorP: function(p, q){
 261                 return new Point2D(q.x - p.x, q.y - p.y);
 262         },
 263         getUnitVectorP: function(p, q){
 264                 var e = this.getVectorP(p, q);
 265                 return this.getUnitVector(e);
 266         },
 267         getUnitVector: function(a){
 268                 var l = Math.sqrt(a.x * a.x + a.y * a.y);
 269                 a.x /= l;
 270                 a.y /= l;
 271                 return a;
 272         },
 273         getNormalUnitVectorSideOfP: function(a, b, p){
 274                 //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。
 275                 return this.getUnitVector(this.getNormalVectorSideOfP(a, b, p));
 276         },
 277         getNormalVectorSideOfP: function(a, b, p){
 278                 //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。
 279                 //pがab上にある場合は零ベクトルとなる。
 280                 var n = this.getVectorP(a, b);
 281                 var t = n.x;
 282                 var i;
 283                 n.x = -n.y;
 284                 n.y = t;
 285
 286                 i = this.getInnerVector2D(n, this.getVectorP(a, p));
 287                 if(i < 0){
 288                         //この法線ベクトルとapの向きが逆なので反転する。
 289                         n.x = -n.x;
 290                         n.y = -n.y;
 291                 } else if(i == 0){
 292                         n.x = 0;
 293                         n.y = 0;
 294                 }
 295                 return n;
 296         },
 297         getExteriorVector2D: function(a, b){
 298                 return a.x * b.y - a.y * b.x;
 299         },
 300         getInnerVector2D: function(a, b){
 301                 return a.x * b.x + a.y * b.y;
 302         },
 303         getDistanceDotAndLineP: function(p, a, b){
 304                 // http://www.sousakuba.com/Programming/gs_dot_line_distance.html
 305                 var ab;
 306                 var ap;
 307                 var s;
 308                 var l;
 309                 var d;
 310
 311                 ab = this.getVectorP(a, b);
 312                 ap = this.getVectorP(a, p);
 313
 314                 s = Math.abs(this.getExteriorVector2D(ab, ap));
 315                 l = this.getVectorLengthP(a, b);
 316                 d = (s / l);
 317
 318                 s = this.getInnerVector2D(ap, ab);
 319                 if(s < 0){
 320                         //線分の範囲外なので端点aからの距離に変換
 321                         //端点から垂線の足までの距離
 322                         l = - (s / l);
 323                         d = Math.sqrt(d * d + l * l);
 324                 } else if(s > l * l){
 325                         //同様に端点bからの距離に変換
 326                         l = s / l;
 327                         d = Math.sqrt(d * d + l * l);
 328                 }
 329                 return d;
 330         },
 331         initGraphicContext: function(newCanvas){
 332                 this.canvas = newCanvas;
 333                 this.context = this.canvas.getContext('2d');
 334                 this.context.fillStyle = "rgba(255,255,255,0.5)";
 335                 this.context.strokeStyle = "rgba(0, 0, 0, 1)";
 336                 this.context.font = "normal 20px sans-serif";
 337                 var w = this.canvas.width / 2;
 338                 var h = this.canvas.height / 2;
 339                 this.context.translate(w, h);
 340                 this.displayRect = new Rectangle(-w, -h, this.canvas.width, this.canvas.height);
 341                 this.currentScale = 1;
 342                 this.positionOffset = new Point2D(0, 0);
 343         },
 344         convertPointToGraphLayerFromCanvasLayerP: function(pCanvas){
 345                 var p = new Point2D(pCanvas.x, pCanvas.y);
 346                 // Canvasの中心が原点
 347                 p.x -= this.canvas.width / 2;
 348                 p.y -= this.canvas.height / 2;
 349                 // スケール変換
 350                 p.x /= this.currentScale;
 351                 p.y /= this.currentScale;
 352
 353                 // オフセット平行移動
 354                 p.x -= this.positionOffset.x;
 355                 p.y -= this.positionOffset.y;
 356
 357                 return p;
 358         },
 359         getNodeAtPointP: function(p){
 360                 var r = new Rectangle(p.x - 10, p.y - 10, 20, 20);
 361
 362                 var nl = this.nodeList;
 363                 for(var i = 0, iLen = nl.length; i < iLen; i++){
 364                         if(r.isIncludePointP(nl[i].position)){
 365                                 return nl[i];
 366                         }
 367                 }
 368                 return null;
 369         }
 370 }
 371
 372 function MGNode(env, identifier){
 373         this.env = env;
 374         this.identifier = identifier;
 375         this.position = new Point2D(0, 0);
 376         this.size = 10;
 377         //ランダムな初期ベクトルをもつ。
 378         this.vector = new Point2D(Math.random() * 2 - 1, Math.random() * 2 - 1);
 379         this.friction = (100 - 8) / 100;
 380         this.repulsionLengthNode = 90;
 381         this.repulsionLengthEdge = 90;
 382         this.ignoreEdgeRepulsion = 0;
 383         this.strokeStyle = "rgba(0, 0, 0, 1)";
 384         this.isSelected = false;
 385 }
 386 MGNode.prototype = {
 387         draw: function(){
 388                 if(this.isSelected){
 389                         this.env.context.strokeStyle = "rgba(255, 0, 0, 1)";
 390                 } else{
 391                         this.env.context.strokeStyle = this.strokeStyle;
 392                 }
 393                 this.env.drawCircle(this.position.x, this.position.y, this.size);
 394                 this.env.drawText(this.identifier.toString(), this.position.x + 10, this.position.y + 10);
 395         },
 396         tick: function(){
 397                 var e;
 398                 var p;
 399                 var l;
 400                 var q;
 401                 this.position.x += this.vector.x;
 402                 this.position.y += this.vector.y;
 403                 this.vector.x *= this.friction;
 404                 this.vector.y *= this.friction;
 405
 406                 if(!this.ignoreEdgeRepulsion){
 407                         //node
 408                         //距離の近い点同士には斥力が働くとする。
 409                         p = this.env.nodeList;
 410                         for(var i = 0, iLen = p.length; i < iLen; i++){
 411                                 var q = this.env.nodeList[i];
 412                                 if(q != this){
 413                                         l = this.env.getVectorLengthP(this.position, q.position);
 414                                         if(l < this.repulsionLengthNode && l != 0){
 415                                                 e = this.env.getUnitVectorP(q.position, this.position);
 416                                                 e.x *= this.repulsionLengthNode / l;
 417                                                 e.y *= this.repulsionLengthNode / l;
 418                                                 this.vector.x += e.x;
 419                                                 this.vector.y += e.y;
 420                                         }
 421                                 }
 422                         }
 423                         //edge
 424                         //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。
 425                         p = this.env.edgeList;
 426                         for(var i = 0, iLen = p.length; i < iLen; i++){
 427                                 var q = this.env.edgeList[i];
 428                                 if(q.node0 != this && q.node1 != this){
 429                                         l = this.env.getDistanceDotAndLineP(this.position, q.node0.position, q.node1.position);
 430                                         if(l < this.repulsionLengthEdge && l != 0){
 431                                                 if(l < 1){
 432                                                         l = 1;
 433                                                 }
 434                                                 e = this.env.getNormalUnitVectorSideOfP(q.node0.position, q.node1.position, this.position);
 435                                                 e.x *= this.repulsionLengthEdge / l;
 436                                                 e.y *= this.repulsionLengthEdge / l;
 437                                                 this.vector.x += e.x;
 438                                                 this.vector.y += e.y;
 439                                                 q.node0.vector.x -= e.x / 2;
 440                                                 q.node0.vector.y -= e.y / 2;
 441                                                 q.node1.vector.x -= e.x / 2;
 442                                                 q.node1.vector.y -= e.y / 2;
 443                                         }
 444                                 }
 445                         }
 446                 } else{
 447                         this.ignoreEdgeRepulsion--;
 448                 }
 449         },
 450 }
 451
 452 function MGEdge(env, identifier, node0, node1){
 453         this.env = env;
 454         this.identifier = identifier;
 455         this.node0 = node0;
 456         this.node1 = node1;
 457         this.freeLength = 250;
 458 }
 459 MGEdge.prototype = {
 460         draw: function(){
 461                 if(this.node0 && this.node1){
 462                         this.env.drawLineP(this.node0.position, this.node1.position);
 463                 }
 464         },
 465         tick: function(){
 466                 var l = this.env.getVectorLengthP(this.node0.position, this.node1.position);
 467                 var e;
 468                 if(l > this.freeLength){
 469                         e = this.env.getUnitVectorP(this.node0.position, this.node1.position);
 470                         e.x *= l / this.freeLength;
 471                         e.y *= l / this.freeLength;
 472                         this.node0.vector.x += e.x;
 473                         this.node0.vector.y += e.y;
 474                         this.node1.vector.x -= e.x;
 475                         this.node1.vector.y -= e.y;
 476                 }
 477         },
 478 }
 479
 480 function Point2D(x, y){
 481         this.x = x;
 482         this.y = y;
 483 }
 484 Point2D.prototype = {
 485
 486 }
 487
 488 function Rectangle(x, y, width, height){
 489         this.origin = new Point2D(x,y);
 490         this.size = new Point2D(width,height);
 491 }
 492 Rectangle.prototype = {
 493         isIncludePointP: function(p){
 494                 return  (this.origin.x <= p.x) && (p.x <= this.origin.x + this.size.x) &&
 495                                 (this.origin.y <= p.y) && (p.y <= this.origin.y + this.size.y);
 496         },
 497 }
 498