Here is a sample of the D3.js visualization:
这里,灰色圆圈是SVG容器。我想将绿色气泡的阻力限制在灰色圆圈边界。
我找到this example并在代码中使用了它,但我遇到了两个错误:
Uncaught TypeError: Cannot read property 'apply' of undefined // points to d3.v3.min.js:3
Uncaught TypeError: Cannot read property 'each' of undefined // points to line X marked in the code below
似乎我不能将.call(drag)
用于强制布局。
我如何让这个工作? jsFiddle
JS:
var data = {
name: "layout",
children: [
{name: "AxisLayout", size: 6725},
{name: "BundledEdgeRouter", size: 3727},
{name: "CircleLayout", size: 9317},
{name: "CirclePackingLayout", "size": 12003},
{name: "DendrogramLayout", "size": 4853},
{name: "ForceDirectedLayout", "size": 8411},
{name: "IcicleTreeLayout", "size": 4864},
{name: "IndentedTreeLayout", "size": 3174},
{name: "Layout", "size": 7881},
{name: "NodeLinkTreeLayout", "size": 12870},
{name: "PieLayout", "size": 2728},
{name: "RadialTreeLayout", "size": 12348},
{name: "RandomLayout", "size": 870},
{name: "StackedAreaLayout", "size": 9121},
{name: "TreeMapLayout", "size": 9191}
]
};
var margin = {
top: 0,
right: 0,
bottom: 0,
left: 0
},
width = 400 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
var n = data.children.length,
m = 1,
padding = 6,
radius = d3.scale.sqrt().range([0, 12]),
color = d3.scale.category10().domain(d3.range(m)),
x = d3.scale.ordinal().domain(d3.range(m)).rangePoints([0, width], 1);
var nodes = d3.range(n).map(function () {
var i = Math.floor(Math.random() * m), //color
v = (i + 1) / m * -Math.log(Math.random()); //value
return {
radius: radius(v),
color: color(i),
cx: x(i),
cy: height / 2,
};
});
nodes.forEach(function(item, index){
item.radius = 20;
});
//console.dir(nodes);
var force = d3.layout.force()
.nodes(nodes)
.size([width, height])
.gravity(0)
.charge(0)
.on("tick", tick)
.start();
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var circle = svg.selectAll("circle")
.data(nodes)
.enter().append("circle")
.attr("r", function (d) {
return d.radius;
})
.style("fill", function (d,i) {
return "green";
})
.call(force.drag)
.call(drag);
var drag = d3.behavior.drag()
.origin(function(d) { return d; })
.on("drag", dragmove);
function tick(e) {
circle.each(gravity(.2 * e.alpha)) // line X
.each(collide(.5))
.attr("cx", function (d) {
return d.x;
})
.attr("cy", function (d) {
return d.y;
});
}
// Move nodes toward cluster focus.
function gravity(alpha) {
return function (d) {
d.y += (d.cy - d.y) * alpha;
d.x += (d.cx - d.x) * alpha;
};
}
// Resolve collisions between nodes.
function collide(alpha) {
var quadtree = d3.geom.quadtree(nodes);
return function (d) {
var r = d.radius + radius.domain()[1] + padding,
nx1 = d.x - r,
nx2 = d.x + r,
ny1 = d.y - r,
ny2 = d.y + r;
quadtree.visit(function (quad, x1, y1, x2, y2) {
if (quad.point && (quad.point !== d)) {
var x = d.x - quad.point.x,
y = d.y - quad.point.y,
l = Math.sqrt(x * x + y * y),
r = d.radius + quad.point.radius + (d.color !== quad.point.color) * padding;
if (l < r) {
l = (l - r) / l * alpha;
d.x -= x *= l;
d.y -= y *= l;
quad.point.x += x;
quad.point.y += y;
}
}
return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1;
});
};
}
function dragmove(){
console.log("dragging..");
}
答案 0 :(得分:6)
好的,经过评论中的冗长讨论,我想出了最终解决方案:
var pointerEl = document.getElementById("pointer");
var canvasEl = document.getElementById("canvas");
var canvas = {
width: canvasEl.offsetWidth,
height: canvasEl.offsetHeight,
top: canvasEl.offsetTop,
left: canvasEl.offsetLeft
};
canvas.center = [canvas.left + canvas.width / 2, canvas.top + canvas.height / 2];
canvas.radius = canvas.width / 2;
window.onmousemove = function(e) {
var result = limit(e.x, e.y);
pointer.style.left = result.x + "px";
pointer.style.top = result.y + "px";
}
function limit(x, y) {
var dist = distance([x, y], canvas.center);
if (dist <= canvas.radius) {
return {x: x, y: y};
}
else {
x = x - canvas.center[0];
y = y - canvas.center[1];
var radians = Math.atan2(y, x)
return {
x: Math.cos(radians) * canvas.radius + canvas.center[0],
y: Math.sin(radians) * canvas.radius + canvas.center[1]
}
}
}
function distance(dot1, dot2) {
var x1 = dot1[0],
y1 = dot1[1],
x2 = dot2[0],
y2 = dot2[1];
return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
}
解决方案使用另一个jsfiddle。
答案 1 :(得分:2)
你可以做些什么来限制拖动事件:
http://jsfiddle.net/InferOn/5wssqqdw/1/
var drag = force.drag()
.on("drag", dragmove);
在这个例子中我已经设置了一个矩形约束(我告诉你任务放置圆约束:)):
function dragmove(d) {
if (d.py > 300) d.py = 300;
if (d.py < 100) d.py = 100;
if (d.px > 300) d.px = 300;
if (d.px < 100) d.px = 100;
}