AlgorithmVisualizer/js/module/directed_graph.js at master · oddcoder/AlgorithmVisualizer · GitHub

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var s = null, graph = null, sigmaCanvas = null;

function DirectedGraphTracer(module) {

if (Tracer.call(this, module || DirectedGraphTracer)) {

DirectedGraph.initGraph();

return true;

}

return false;

}

DirectedGraphTracer.prototype = Object.create(Tracer.prototype);

DirectedGraphTracer.prototype.constructor = DirectedGraphTracer;

// Override

DirectedGraphTracer.prototype.resize = function () {

Tracer.prototype.resize.call(this);

this.refresh();

};

// Override

DirectedGraphTracer.prototype.clear = function () {

Tracer.prototype.clear.call(this);

DirectedGraph.clearGraphColor();

};

DirectedGraphTracer.prototype._setTreeData = function (G, root) {

root = root || 0;

var maxDepth = -1;

var chk = [];

for (var i = 0; i < G.length; i++) chk.push(false);

var getDepth = function (node, depth) {

if (chk[node]) throw "the given graph is not a tree because it forms a circuit";

chk[node] = true;

if (maxDepth < depth) maxDepth = depth;

for (var i = 0; i < G[node].length; i++) {

if (G[node][i]) getDepth(i, depth + 1);

}

};

getDepth(root, 1);

if (this._setData(G, root)) return true;

var place = function (node, x, y) {

var temp = graph.nodes(DirectedGraph.n(node));

temp.x = x;

temp.y = y;

};

var wgap = 1 / (maxDepth - 1);

var dfs = function (node, depth, top, bottom) {

place(node, depth * wgap, (top + bottom) / 2);

var children = 0;

for (var i = 0; i < G[node].length; i++) {

if (G[node][i]) children++;

}

var vgap = (bottom - top) / children;

var cnt = 0;

for (var i = 0; i < G[node].length; i++) {

if (G[node][i]) dfs(i, depth + 1, top + vgap * cnt, top + vgap * ++cnt);

}

};

dfs(root, 0, 0, 1);

this.refresh();

};

// Override

DirectedGraphTracer.prototype._setData = function (G) {

if (Tracer.prototype._setData.call(this, arguments)) return true;

graph.clear();

var nodes = [];

var edges = [];

var unitAngle = 2 * Math.PI / G.length;

var currentAngle = 0;

for (var i = 0; i < G.length; i++) {

currentAngle += unitAngle;

nodes.push({

id: DirectedGraph.n(i),

label: '' + i,

x: .5 + Math.sin(currentAngle) / 2,

y: .5 + Math.cos(currentAngle) / 2,

size: 1,

color: DirectedGraph.graphColor.default

});

for (var j = 0; j < G[i].length; j++) {

if (G[i][j]) {

edges.push({

id: DirectedGraph.e(i, j),

source: DirectedGraph.n(i),

target: DirectedGraph.n(j),

color: DirectedGraph.graphColor.default,

size: 1

});

}

graph.read({

nodes: nodes,

edges: edges

});

s.camera.goTo({

x: 0,

y: 0,

angle: 0,

ratio: 1

});

this.refresh();

return false;

};

DirectedGraphTracer.prototype._visit = function (target, source) {

this.pushStep({type: 'visit', target: target, source: source}, true);

};

DirectedGraphTracer.prototype._leave = function (target, source) {

this.pushStep({type: 'leave', target: target, source: source}, true);

};

DirectedGraphTracer.prototype.processStep = function (step, options) {

switch (step.type) {

case 'visit':

case 'leave':

var visit = step.type == 'visit';

var targetNode = graph.nodes(DirectedGraph.n(step.target));

var color = visit ? DirectedGraph.graphColor.visited : DirectedGraph.graphColor.left;

targetNode.color = color;

if (step.source !== undefined) {

var edgeId = DirectedGraph.e(step.source, step.target);

var edge = graph.edges(edgeId);

edge.color = color;

graph.dropEdge(edgeId).addEdge(edge);

}

var source = step.source;

if (source === undefined) source = '';

printTrace(visit ? source + ' -> ' + step.target : source + ' <- ' + step.target);

break;

}

};

// Override

DirectedGraphTracer.prototype.refresh = function () {

Tracer.prototype.refresh.call(this);

s.refresh();

};

// Override

DirectedGraphTracer.prototype.prevStep = function () {

this.clear();

$('#tab_trace .wrapper').empty();

var finalIndex = this.traceIndex - 1;

if (finalIndex < 0) {

this.traceIndex = -1;

this.refresh();

return;

}

for (var i = 0; i < finalIndex; i++) {

this.step(i, {virtual: true});

}

this.step(finalIndex);

};

var DirectedGraph = {

random: function (N, ratio) {

if (!N) N = 5;

if (!ratio) ratio = .3;

var G = [];

for (var i = 0; i < N; i++) {

G.push([]);

for (var j = 0; j < N; j++) {

if (i == j) G[i].push(0);

else G[i].push((Math.random() * (1 / ratio) | 0) == 0 ? 1 : 0);

}

return G;

initGraph: function () {

if (sigmaCanvas == null) {

sigmaCanvas = $.extend(true, {}, sigma.canvas);

} else {

sigma.canvas = $.extend(true, {}, sigmaCanvas);

}

s = new sigma({

renderer: {

container: $module_container[0],

type: 'canvas'

settings: {

minArrowSize: 8,

defaultEdgeType: 'arrow',

maxEdgeSize: 2.5,

labelThreshold: 4,

font: 'Roboto',

defaultLabelColor: '#fff',

zoomMin: 0.6,

zoomMax: 1.2,

skipErrors: true,

minNodeSize: .5,

maxNodeSize: 12,

labelSize: 'proportional',

labelSizeRatio: 1.3,

edgeLabelSize: 'proportional',

defaultEdgeLabelSize: 20,

edgeLabelSizePowRatio: 0.8

}

});

graph = s.graph;

sigma.canvas.labels.def = DirectedGraph.drawLabel;

sigma.canvas.hovers.def = DirectedGraph.drawOnHover;

sigma.canvas.edges.arrow = function (edge, source, target, context, settings) {

var color = DirectedGraph.getColor(edge, source, target, settings);

DirectedGraph.drawArrow(edge, source, target, color, context, settings);

};

sigma.plugins.dragNodes(s, s.renderers[0]);

graphColor: {

visited: '#f00',

left: '#000',

default: '#888'

clearGraphColor: function () {

graph.nodes().forEach(function (node) {

node.color = DirectedGraph.graphColor.default;

});

graph.edges().forEach(function (edge) {

edge.color = DirectedGraph.graphColor.default;

});

n: function (v) {

return 'n' + v;

e: function (v1, v2) {

return 'e' + v1 + '_' + v2;

getColor: function (edge, source, target, settings) {

var color = edge.color,

edgeColor = settings('edgeColor'),

defaultNodeColor = settings('defaultNodeColor'),

defaultEdgeColor = settings('defaultEdgeColor');

if (!color)

switch (edgeColor) {

case 'source':

color = source.color || defaultNodeColor;

break;

case 'target':

color = target.color || defaultNodeColor;

break;

default:

color = defaultEdgeColor;

break;

}

return color;

drawLabel: function (node, context, settings) {

var fontSize,

prefix = settings('prefix') || '',

size = node[prefix + 'size'];

if (size < settings('labelThreshold'))

return;

if (!node.label || typeof node.label !== 'string')

return;

fontSize = (settings('labelSize') === 'fixed') ?

settings('defaultLabelSize') :

settings('labelSizeRatio') * size;

context.font = (settings('fontStyle') ? settings('fontStyle') + ' ' : '') +

fontSize + 'px ' + settings('font');

context.fillStyle = (settings('labelColor') === 'node') ?

(node.color || settings('defaultNodeColor')) :

settings('defaultLabelColor');

context.textAlign = 'center';

context.fillText(

node.label,

Math.round(node[prefix + 'x']),

Math.round(node[prefix + 'y'] + fontSize / 3)

);

drawArrow: function (edge, source, target, color, context, settings) {

var prefix = settings('prefix') || '',

size = edge[prefix + 'size'] || 1,

tSize = target[prefix + 'size'],

sX = source[prefix + 'x'],

sY = source[prefix + 'y'],

tX = target[prefix + 'x'],

tY = target[prefix + 'y'],

angle = Math.atan2(tY - sY, tX - sX),

dist = 3;

sX += Math.sin(angle) * dist;

tX += Math.sin(angle) * dist;

sY += -Math.cos(angle) * dist;

tY += -Math.cos(angle) * dist;

var aSize = Math.max(size * 2.5, settings('minArrowSize')),

d = Math.sqrt(Math.pow(tX - sX, 2) + Math.pow(tY - sY, 2)),

aX = sX + (tX - sX) * (d - aSize - tSize) / d,

aY = sY + (tY - sY) * (d - aSize - tSize) / d,

vX = (tX - sX) * aSize / d,

vY = (tY - sY) * aSize / d;

context.strokeStyle = color;

context.lineWidth = size;

context.beginPath();

context.moveTo(sX, sY);

context.lineTo(

aX,

);

context.stroke();

context.fillStyle = color;

context.beginPath();

context.moveTo(aX + vX, aY + vY);

context.lineTo(aX + vY * 0.6, aY - vX * 0.6);

context.lineTo(aX - vY * 0.6, aY + vX * 0.6);

context.lineTo(aX + vX, aY + vY);

context.closePath();

context.fill();

drawOnHover: function (node, context, settings, next) {

var nodeIdx = node.id.substring(1);

graph.edges().forEach(function (edge) {

var ends = edge.id.substring(1).split("_");

context.setLineDash([5, 5]);

if (ends[0] == nodeIdx) {

var color = '#0ff';

var source = node;

var target = graph.nodes('n' + ends[1]);

DirectedGraph.drawArrow(edge, source, target, color, context, settings);

if (next) next(edge, source, target, color, context, settings);

} else if (ends[1] == nodeIdx) {

var color = '#ff0';

var source = graph.nodes('n' + ends[0]);

var target = node;

DirectedGraph.drawArrow(edge, source, target, color, context, settings);

if (next) next(edge, source, target, color, context, settings);

}

});

}

};

AlgorithmVisualizer/js/module/directed_graph.js at master · oddcoder/AlgorithmVisualizer · GitHub

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