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Fixed issue 420 Use as much screen estate as possible on initial load #476

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Fixed issue 420 Use as much screen estate as possible on initial load #476

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32 changes: 32 additions & 0 deletions public/example_templates/netjson-searchElements.html
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,8 @@
See the following comments for details.
*/
// `graph` render defaultly.
const LABEL_ZOOM_THRESHOLD = 1.2;
const SMALL_GRAPH_NODE_COUNT = 40;
let graph = new NetJSONGraph("../assets/data/netjsonmap.json", {
onReady: function () {
let searchContainer = document.createElement("div"),
Expand Down Expand Up @@ -103,10 +105,40 @@

searchInput.value = "";
};
applyAutoInitialZoom(this);
},
});

graph.render();
function applyAutoInitialZoom(instance) {
const nodes = instance.data.nodes || [];
if (!nodes.length) return;

const container = instance.el.getBoundingClientRect();

let minX = Infinity, minY = Infinity;
let maxX = -Infinity, maxY = -Infinity;

nodes.forEach(n => {
if (typeof n.x !== "number" || typeof n.y !== "number") return;
minX = Math.min(minX, n.x);
minY = Math.min(minY, n.y);
maxX = Math.max(maxX, n.x);
maxY = Math.max(maxY, n.y);
});

const graphArea = (maxX - minX) * (maxY - minY);
const viewportArea = container.width * container.height;
const densityRatio = graphArea / viewportArea;

const isSmallGraph =
nodes.length <= SMALL_GRAPH_NODE_COUNT ||
densityRatio < 0.25;

if (isSmallGraph) {
instance.zoom(LABEL_ZOOM_THRESHOLD + 0.2);
}
}
</script>
</body>
</html>
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