Created
December 27, 2011 22:45
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HTML5 Canvas Graph View
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>graph-vis</title> | |
| </head> | |
| <body> | |
| <canvas id="viewer" width="800" height="500"></canvas> | |
| <script src="graph-vis.js"></script> | |
| </body> | |
| </html> |
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| var graph = { | |
| nodelist: [{ | |
| x: 25, | |
| y: 25 | |
| }, { | |
| x: 75, | |
| y: 25 | |
| }, { | |
| x: 125, | |
| y: 75 | |
| }, { | |
| x: 75, | |
| y: 125 | |
| }, { | |
| x: 25, | |
| y: 125 | |
| }], | |
| edgelist: [{ | |
| n: 0, | |
| m: 1 | |
| }, { | |
| n: 0, | |
| m: 4 | |
| }, { | |
| n: 1, | |
| m: 2 | |
| }, { | |
| n: 1, | |
| m: 3 | |
| }, { | |
| n: 1, | |
| m: 4 | |
| }, { | |
| n: 2, | |
| m: 3 | |
| }, { | |
| n: 3, | |
| m: 4 | |
| }] | |
| }; | |
| graph.draw = function(ctx) { | |
| var i; | |
| var n, m; | |
| for(i = 0; i < this.edgelist.length; i += 1) { | |
| n = this.nodelist[this.edgelist[i].n]; | |
| m = this.nodelist[this.edgelist[i].m]; | |
| drawEdge(ctx, n.x, n.y, m.x, m.y); | |
| } | |
| for(i = 0; i < this.nodelist.length; i += 1) { | |
| n = this.nodelist[i]; | |
| drawNode(ctx, n.x, n.y); | |
| } | |
| }; | |
| var drawNode = function(ctx, x, y) { | |
| ctx.fillStyle = "white"; | |
| ctx.beginPath(); | |
| ctx.arc(x,y,10,0,Math.PI*2,true); | |
| ctx.fill(); | |
| ctx.stroke(); | |
| }; | |
| var drawEdge = function(ctx, x0, y0, x1, y1) { | |
| ctx.beginPath(); | |
| ctx.moveTo(x0,y0); | |
| ctx.lineTo(x1,y1); | |
| ctx.stroke(); | |
| }; | |
| (function draw() { | |
| var canvas = document.getElementById("viewer"); | |
| if (canvas.getContext) { | |
| var ctx = canvas.getContext("2d"); | |
| graph.draw(ctx); | |
| } | |
| })(); |
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