我在vis.js中有一个包含许多节点的网络图。选择某个组时,我想平移和缩放图形,以便该组的所有节点都适合屏幕。
我遍历图中的每个节点并计算我感兴趣的所有节点的边界框,然后我使用moveTo
方法移动并将图形缩放到该边界框的中心。伪代码:
var allNodes = data.nodes.get({
returnType: "Object"
});
var bounds;
for (n in allNodes) {
if (matchesCondition(allNodes[n])) {
bounds = extendBounds(bounds, graph.getBoundingBox(allNodes[n]));
}
}
var newViewport = {
position: {
x: (bounds.x1+bounds.x2)/2;
y: (bounds.y1+bounds.y2)/2;
},
// What is the visible width, where do I get it from?
scale: Math.min(??? / (bounds.x2-bounds.x1), ??? / (bounds.y2-bounds.y1))
}
graph.moveTo(newViewport);
问题:我如何计算比例,即我该怎样替换???在上面的伪代码?
答案 0 :(得分:8)
来自Vis.js groups example的示例数据。
为了适应视口,您只需使用本机.fit()
方法即可。由于the documentation不提供可分享的链接,因此这里是API描述:
缩小,以便所有节点都适合画布。你可以提供选项 定制这个:
{ nodes:[Array of nodeIds], animation: { //can be a boolean too duration: Number easingFunction: String } }
节点可用于缩放以仅适合视图中的特定节点。
考虑到这一点,我们需要做的就是获取给定组中的所有节点。令人惊讶的是,user-land API似乎没有为此提供方法(?),因此需要一种小的过滤方法。
//TODO: Is there no user-land API for this?
var getGroup = function getGroup(nodeId) {
var nodesHandler = network.nodesHandler;
var innerNodes = nodesHandler.body.nodes;
//Lazily assume ids match indices
var node = innerNodes[nodeId];
return node.options.group;
};
var getGroupNodes = function getGroupNodes(group) {
// http://elijahmanor.com/reducing-filter-and-map-down-to-reduce/
var filtered = nodes.reduce(function(output, node) {
if (node.group === group) {
output.push(node.id);
}
return output;
}, []);
return filtered;
};
//START Vis.js group example
var color = 'gray';
var len = undefined;
var nodes = [{
id: 0,
label: "0",
group: 0
}, {
id: 1,
label: "1",
group: 0
}, {
id: 2,
label: "2",
group: 0
}, {
id: 3,
label: "3",
group: 1
}, {
id: 4,
label: "4",
group: 1
}, {
id: 5,
label: "5",
group: 1
}, {
id: 6,
label: "6",
group: 2
}, {
id: 7,
label: "7",
group: 2
}, {
id: 8,
label: "8",
group: 2
}, {
id: 9,
label: "9",
group: 3
}, {
id: 10,
label: "10",
group: 3
}, {
id: 11,
label: "11",
group: 3
}, {
id: 12,
label: "12",
group: 4
}, {
id: 13,
label: "13",
group: 4
}, {
id: 14,
label: "14",
group: 4
}, {
id: 15,
label: "15",
group: 5
}, {
id: 16,
label: "16",
group: 5
}, {
id: 17,
label: "17",
group: 5
}, {
id: 18,
label: "18",
group: 6
}, {
id: 19,
label: "19",
group: 6
}, {
id: 20,
label: "20",
group: 6
}, {
id: 21,
label: "21",
group: 7
}, {
id: 22,
label: "22",
group: 7
}, {
id: 23,
label: "23",
group: 7
}, {
id: 24,
label: "24",
group: 8
}, {
id: 25,
label: "25",
group: 8
}, {
id: 26,
label: "26",
group: 8
}, {
id: 27,
label: "27",
group: 9
}, {
id: 28,
label: "28",
group: 9
}, {
id: 29,
label: "29",
group: 9
}];
var edges = [{
from: 1,
to: 0
}, {
from: 2,
to: 0
}, {
from: 4,
to: 3
}, {
from: 5,
to: 4
}, {
from: 4,
to: 0
}, {
from: 7,
to: 6
}, {
from: 8,
to: 7
}, {
from: 7,
to: 0
}, {
from: 10,
to: 9
}, {
from: 11,
to: 10
}, {
from: 10,
to: 4
}, {
from: 13,
to: 12
}, {
from: 14,
to: 13
}, {
from: 13,
to: 0
}, {
from: 16,
to: 15
}, {
from: 17,
to: 15
}, {
from: 15,
to: 10
}, {
from: 19,
to: 18
}, {
from: 20,
to: 19
}, {
from: 19,
to: 4
}, {
from: 22,
to: 21
}, {
from: 23,
to: 22
}, {
from: 22,
to: 13
}, {
from: 25,
to: 24
}, {
from: 26,
to: 25
}, {
from: 25,
to: 7
}, {
from: 28,
to: 27
}, {
from: 29,
to: 28
}, {
from: 28,
to: 0
}];
// create a network
var container = document.getElementById('mynetwork');
var data = {
nodes: nodes,
edges: edges
};
var options = {
nodes: {
shape: 'dot',
size: 30,
font: {
size: 32,
color: '#ffffff'
},
borderWidth: 2
},
edges: {
width: 2
}
};
network = new vis.Network(container, data, options);
//END Vis.js group example
network.on("click", function(e) {
//Zoom only on single node clicks, zoom out otherwise
if (e.nodes.length !== 1) {
network.fit();
return;
}
var nodeId = e.nodes[0];
//Find out what group the node belongs to
var group = getGroup(nodeId);
//TODO: How do you want to handle ungrouped nodes?
if (group === undefined) return;
var groupNodes = getGroupNodes(group);
network.fit({
nodes: groupNodes
});
});
html,
body,
#mynetwork {
width: 100%;
height: 100%;
margin: 0;
}
<script src="http://cdnjs.cloudflare.com/ajax/libs/vis/4.3.0/vis.min.js"></script>
<div id="mynetwork"></div>