我正在与arbor.js合作建立争议网络。 问题是，当我只有几个带有长标签的节点时，画布的边框不受尊重。如何更改边缘的长度？或者我怎样才能让乔木尊重画布的极限呢？
我的代码：
<html lang="fr">
<head>
<script language="javascript" type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="path/to/arbor.js" ></script>
<script language="javascript" type="text/javascript" src="path/to/arbor-tween.js" ></script>
<script language="javascript" type="text/javascript" src="path/to/graphics.js" ></script>
<script language="javascript" type="text/javascript" src="renderer.js" ></script>
<style>
canvas.linkable{cursor: pointer;}
</style>
</head>
<body>
<canvas id="viewport" width="940" height="600"></canvas>
<script language="javascript" type="text/javascript">
var colour = {
orange:"#EEB211",
darkblue:"#21526a",
purple:"#941e5e",
limegreen:"#c1d72e",
darkgreen:"#619b45",
lightblue:"#009fc3",
pink:"#d11b67",
}
var data = {
nodes:{
principal:{ 'label':'Fins de la sélection',
'color':colour.darkblue, 'alpha': 0, link:'http://controverses.sciencespo-toulouse.fr/angr/' },
controverse2:{ 'label':'La sélection, symbole du modèle productiviste de l\'agriculture ?',
'color':colour.darkblue, 'alpha': 0, link:'http://controverses.sciencespo-toulouse.fr/angr/' },
controverse3:{ 'label':'Les objectifs de la sélection entrent-ils en conflit avec ceux de la conservation ?',
'color':colour.darkblue, 'alpha': 0, link:'http://controverses.sciencespo-toulouse.fr/angr/' },
controverse4:{ 'label':'Race pure ou race croisée ?',
'color':colour.darkblue, 'alpha': 0, link:'http://controverses.sciencespo-toulouse.fr/angr/' },
},
edges:{
principal:{ controverse2:{},
controverse3:{},
controverse4:{} },
}
}
// Initialise arbor
var sys = arbor.ParticleSystem()
sys.parameters({stiffness:900, repulsion:2000, gravity:false, dt:0.015})
sys.renderer = Renderer("#viewport");
sys.graft(data);
/*
var nav = Nav("#nav")
$(sys.renderer).bind('navigate', nav.navigate)
$(nav).bind('mode', sys.renderer.switchMode)
nav.init()*/
</script>
</body>
</html>
我的渲染器.js：
(function(){
Renderer = function(canvas){
var canvas = $(canvas).get(0)
var ctx = canvas.getContext("2d");
var gfx = arbor.Graphics(canvas)
var particleSystem = null
var dom = $(canvas)
var that = {
init:function(system){
particleSystem = system
particleSystem.screenSize(canvas.width, canvas.height)
particleSystem.screenPadding(40)
that.initMouseHandling()
},
redraw:function(){
if (!particleSystem) return
gfx.clear() // convenience ƒ: clears the whole canvas rect
// draw the nodes & save their bounds for edge drawing
var nodeBoxes = {}
particleSystem.eachNode(function(node, pt){
// node: {mass:#, p:{x,y}, name:"", data:{}}
// pt: {x:#, y:#} node position in screen coords
// determine the box size and round off the coords if we'll be
// drawing a text label (awful alignment jitter otherwise...)
var label = node.data.label||""
var w = ctx.measureText(""+label).width + 10
if (!(""+label).match(/^[ \t]*$/)){
pt.x = Math.floor(pt.x)
pt.y = Math.floor(pt.y)
}else{
label = null
}
// draw a rectangle centered at pt
if (node.data.color) ctx.fillStyle = node.data.color
else ctx.fillStyle = "rgba(0,0,0,.2)"
if (node.data.color=='none') ctx.fillStyle = "white"
if (node.data.shape=='dot'){
gfx.oval(pt.x-w/2, pt.y-w/2, w,w, {fill:ctx.fillStyle})
nodeBoxes[node.name] = [pt.x-w/2, pt.y-w/2, w,w]
}else{
gfx.rect(pt.x-w/2, pt.y-10, w,20, 4, {fill:ctx.fillStyle})
nodeBoxes[node.name] = [pt.x-w/2, pt.y-11, w, 22]
}
// draw the text
if (label){
ctx.font = "12px Helvetica"
ctx.textAlign = "center"
ctx.fillStyle = "white"
if (node.data.color=='none') ctx.fillStyle = '#333333'
ctx.fillText(label||"", pt.x, pt.y+4)
ctx.fillText(label||"", pt.x, pt.y+4)
}
})
// draw the edges
particleSystem.eachEdge(function(edge, pt1, pt2){
// edge: {source:Node, target:Node, length:#, data:{}}
// pt1: {x:#, y:#} source position in screen coords
// pt2: {x:#, y:#} target position in screen coords
var weight = edge.data.weight
var color = edge.data.color
if (!color || (""+color).match(/^[ \t]*$/)) color = null
// find the start point
var tail = intersect_line_box(pt1, pt2, nodeBoxes[edge.source.name])
var head = intersect_line_box(tail, pt2, nodeBoxes[edge.target.name])
ctx.save()
ctx.beginPath()
ctx.lineWidth = (!isNaN(weight)) ? parseFloat(weight) : 1
ctx.strokeStyle = (color) ? color : "#cccccc"
ctx.fillStyle = null
ctx.moveTo(tail.x, tail.y)
ctx.lineTo(head.x, head.y)
ctx.stroke()
ctx.restore()
// draw an arrowhead if this is a -> style edge
if (edge.data.directed){
ctx.save()
// move to the head position of the edge we just drew
var wt = !isNaN(weight) ? parseFloat(weight) : 1
var arrowLength = 6 + wt
var arrowWidth = 2 + wt
ctx.fillStyle = (color) ? color : "#cccccc"
ctx.translate(head.x, head.y);
ctx.rotate(Math.atan2(head.y - tail.y, head.x - tail.x));
// delete some of the edge that's already there (so the point isn't hidden)
ctx.clearRect(-arrowLength/2,-wt/2, arrowLength/2,wt)
// draw the chevron
ctx.beginPath();
ctx.moveTo(-arrowLength, arrowWidth);
ctx.lineTo(0, 0);
ctx.lineTo(-arrowLength, -arrowWidth);
ctx.lineTo(-arrowLength * 0.8, -0);
ctx.closePath();
ctx.fill();
ctx.restore()
}
})
},
initMouseHandling:function(){
// no-nonsense drag and drop (thanks springy.js)
selected = null;
nearest = null;
var dragged = null;
var oldmass = 1
var mouse_is_down = false;
var mouse_is_moving = false
// set up a handler object that will initially listen for mousedowns then
// for moves and mouseups while dragging
var handler = {
mousemove:function(e){
if(!mouse_is_down){
var pos = $(canvas).offset();
_mouseP = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
nearest = particleSystem.nearest(_mouseP);
if (!nearest.node) return false
selected = (nearest.distance < 50) ? nearest : null
if(selected && selected.node.data.link){
dom.addClass('linkable')
} else {
dom.removeClass('linkable')
}
}
return false
},
clicked:function(e){
var pos = $(canvas).offset();
_mouseP = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
nearest = particleSystem.nearest(_mouseP);
if (!nearest.node) return false
selected = (nearest.distance < 50) ? nearest : null
if (nearest && selected && nearest.node===selected.node){
var link = selected.node.data.link
if (link.match(/^#/)){
$(that).trigger({type:"navigate", path:link.substr(1)})
}else{
window.open(link, "frame3")
}
return false
}
},
mousedown:function(e){
var pos = $(canvas).offset();
_mouseP = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
selected = nearest = dragged = particleSystem.nearest(_mouseP);
if (dragged.node !== null) dragged.node.fixed = true
mouse_is_down = true
mouse_is_moving = false
$(canvas).bind('mousemove', handler.dragged)
$(window).bind('mouseup', handler.dropped)
return false
},
dragged:function(e){
var old_nearest = nearest && nearest.node._id
var pos = $(canvas).offset();
var s = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
mouse_is_moving = true
if (!nearest) return
if (dragged !== null && dragged.node !== null){
var p = particleSystem.fromScreen(s)
dragged.node.p = p
}
return false
},
dropped:function(e){
if (dragged===null || dragged.node===undefined) return
if (dragged.node !== null) dragged.node.fixed = false
dragged.node.tempMass = 50
dragged = null
selected = null
$(canvas).unbind('mousemove', handler.dragged)
$(window).unbind('mouseup', handler.dropped)
_mouseP = null
if(mouse_is_moving){
// console.log("was_dragged")
} else {
handler.clicked(e)
}
mouse_is_down = false
return false
}
}
$(canvas).mousedown(handler.mousedown);
$(canvas).mousemove(handler.mousemove);
}
}
// helpers for figuring out where to draw arrows (thanks springy.js)
var intersect_line_line = function(p1, p2, p3, p4)
{
var denom = ((p4.y - p3.y)*(p2.x - p1.x) - (p4.x - p3.x)*(p2.y - p1.y));
if (denom === 0) return false // lines are parallel
var ua = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / denom;
var ub = ((p2.x - p1.x)*(p1.y - p3.y) - (p2.y - p1.y)*(p1.x - p3.x)) / denom;
if (ua < 0 || ua > 1 || ub < 0 || ub > 1) return false
return arbor.Point(p1.x + ua * (p2.x - p1.x), p1.y + ua * (p2.y - p1.y));
}
var intersect_line_box = function(p1, p2, boxTuple)
{
var p3 = {x:boxTuple[0], y:boxTuple[1]},
w = boxTuple[2],
h = boxTuple[3]
var tl = {x: p3.x, y: p3.y};
var tr = {x: p3.x + w, y: p3.y};
var bl = {x: p3.x, y: p3.y + h};
var br = {x: p3.x + w, y: p3.y + h};
return intersect_line_line(p1, p2, tl, tr) ||
intersect_line_line(p1, p2, tr, br) ||
intersect_line_line(p1, p2, br, bl) ||
intersect_line_line(p1, p2, bl, tl) ||
false
}
return that
}
})()
我试图直接在脚本中修改边长，例如：
edges:{
principal:{ controverse2:{length:1},
controverse3:{length:1},
controverse4:{length:1} },
}
它不起作用。
感谢您的帮助！
答案 0 :(得分：0)
为粒子系统
设置此参数
sys.parameters({ repulsion: 1000, gravity: false, dt: 0.35 })