我试图让我的 D3 网络在它达到一个不错的布局(alpha 达到 0)后冻结。我希望力完全停止,即使拖动节点(用户应该能够手动重新排列节点)。我想我知道如何通过修改节点的 mousedown 和 mouseup 调用的函数来完成第二部分。但是,我无法让原始布局和冻结工作。
我查看了“静态”强制布局的示例,其中网络仅在布局完成后显示。但是,我希望网络在达到稳定布局时显示。我将此添加到绘制网络的函数的末尾:
while (force.alpha() >0.005) {
force.tick();
}
force.stop();
通过此添加,网络在到达force.stop()
. 有谁知道如何让它在“滴答”时显示?
编辑:这是我的tick
功能实现:
function tick(e) {
console.log(force.alpha());
if (force.alpha() <0.05) {
force.stop();
}
var h = svgH;
if (e.alpha < 0.05) {
var q = d3.geom.quadtree(nodes),
i = 0,
n = nodes.length;
while (++i < n) {
q.visit(collide(nodes[i], e.alpha));
}
}
path.attr("d", function(d) {
// Total difference in x and y from source to target
diffX = d.target.x - d.source.x;
diffY = d.target.y - d.source.y;
// Length of path from center of source node to center of target node
pathLength = Math.sqrt((diffX * diffX) + (diffY * diffY));
// x and y distances from center to outside edge of target node
offsetX = (diffX * d.target.radius) / pathLength;
offsetY = (diffY * d.target.radius) / pathLength;
if (d.target.y < d.source.y) {
var avgY = (d.target.y + d.source.y)/2;
if (d.target.fixed != true) {
d.target.y = avgY;
}
if (d.source.fixed != true) {
d.source.y = avgY;
}
}
return "M" + d.source.x + "," + d.source.y + "L" + (d.target.x - offsetX) + "," + (d.target.y - offsetY);
});
// Keep circles within bounds of screen
var r = 6;
circle.attr("cx", function(d) { return d.x = Math.max(r + d.radius, Math.min(w - r, d.x)); })
.attr("cy", function(d) {
return d.y = Math.max(d.radius, Math.min(h - d.radius, d.y));
});
text.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}