gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>An Instrument Gauge</title>
<meta name="description" content="An instrument gauge implemented in GoJS using a Graduated Panel." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;
myDiagram = $(go.Diagram, "myDiagramDiv");
myDiagram.nodeTemplate =
$(go.Node, "Auto",
$(go.Shape, "Circle",
{ stroke: "orange", strokeWidth: 5, spot1: go.Spot.TopLeft, spot2: go.Spot.BottomRight },
new go.Binding("stroke", "color")),
$(go.Panel, "Spot",
$(go.Panel, "Graduated",
{
name: "SCALE", margin: 14,
graduatedTickUnit: 2.5, // tick marks at each multiple of 2.5
graduatedMax: 100, // this is actually the default value
stretch: go.GraphObject.None // needed to avoid unnecessary re-measuring!!!
},
new go.Binding("graduatedMax", "max"), // controls the range of the gauge
// the main path of the graduated panel, an arc starting at 135 degrees and sweeping for 270 degrees
$(go.Shape, { name: "SHAPE", geometryString: "M-70.7 70.7 B135 270 0 0 100 100 M0 100", stroke: "white", strokeWidth: 4 }),
// three differently sized tick marks
$(go.Shape, { geometryString: "M0 0 V10", stroke: "white", strokeWidth: 1.5 }),
$(go.Shape, { geometryString: "M0 0 V12", stroke: "white", strokeWidth: 2.5, interval: 2 }),
$(go.Shape, { geometryString: "M0 0 V15", stroke: "white", strokeWidth: 3.5, interval: 4 }),
$(go.TextBlock,
{ // each tick label
interval: 4,
alignmentFocus: go.Spot.Center,
font: "bold italic 14pt sans-serif", stroke: "white",
segmentOffset: new go.Point(0, 30)
})
),
$(go.TextBlock,
{ alignment: new go.Spot(0.5, 0.9), stroke: "orange", font: "bold italic 14pt sans-serif" },
new go.Binding("text", "key"),
new go.Binding("stroke", "color")),
$(go.Shape, { fill: "red", strokeWidth: 0, geometryString: "F1 M-6 0 L0 -6 100 0 0 6z x M-100 0" },
new go.Binding("angle", "value", convertValueToAngle)),
$(go.Shape, "Circle", { width: 2, height: 2, fill: "#444" })
)
);
// this determines the angle of the needle, based on the data.value argument
function convertValueToAngle(v, shape) {
var scale = shape.part.findObject("SCALE");
var p = scale.graduatedPointForValue(v);
var shape = shape.part.findObject("SHAPE");
var c = shape.actualBounds.center;
return c.directionPoint(p);
}
myDiagram.model = new go.GraphLinksModel([
{ key: "Alpha", value: 35 },
{ key: "Beta", color: "green", max: 140, value: 70 }
], [
{ from: "Alpha", to: "Beta" }
]);
loop();
}
// change each gauge's value several times a second
function loop() {
setTimeout(function() {
myDiagram.startTransaction();
myDiagram.nodes.each(function(node) {
var scale = node.findObject("SCALE");
if (scale === null || scale.type !== go.Panel.Graduated) return;
// keep the new value within the range of the graduated panel
var min = scale.graduatedMin;
var max = scale.graduatedMax;
var v = node.data.value || Math.floor((max - min) / 2); // default to middle value
if (v < min) v++;
else if (v > max) v--;
else v += (Math.random() < 0.5) ? -0.5 : 0.5; // random walk
myDiagram.model.setDataProperty(node.data, "value", v);
});
myDiagram.commitTransaction("modified Graduated Panel");
loop();
}, 1000 / 6);
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:350px"></div>
<p>
This makes use of a <a href="../intro/graduatedPanels.html">"Graduated"</a> <a>Panel</a>,
which holds the main path of the scale, a Shape whose <a>Shape.geometry</a> is a circular arc.
In addition that Graduated Panel holds three different Shapes acting as templates for tick marks and
a TextBlock acting as a template for tick labels.
</p>
<p>
In a Spot Panel with the Graduated Panel scale are an italic TextBlock showing the node identifier and a red elongated diamond "needle" Shape.
The needle's angle is determined by <code>convertValueToAngle</code>, which finds the point on the Graduated Panel's
main path element corresponding to <code>data.value</code> and computes the angle from the center to that point.
The data value is updated several times per second.
A circle Shape surrounds the Spot Panel.
</p>
</div>
</body>
</html>