I have a piece of code here:
<html>
<head>
<link rel="stylesheet" type="text/css" href="https://jsxgraph.org/distrib/jsxgraph.css" />
<script type="text/javascript" src="https://jsxgraph.org/distrib/jsxgraphcore.js"></script>
</head>
<body>
<div id="box" class="jxgbox" style="width:500px; height:500px;"></div>
<script type="text/javascript">
var brd = JXG.JSXGraph.initBoard('box',{axis:false,boundingbox:[-10,10,10,-10],keepaspectratio:true});
var p = brd.create('point', [0,0]);
var q = brd.create('point', [10,0]);
var circ = brd.create('circle', [p, q]);
// Create an empty curve
var ticks = brd.create('curve', [[0], [0]],
{labels: ['0','30','60','90','120','150','180','210','240','270','300','330'],
strokeWidth: 1,
strokeColor: 'blue',
strokeOpacity: 0.5,
drawLabels: true,
label: {offset: [-0.5,-0.5], anchorX: 'middle', anchorY: 'top'}});
// Make ticks out of the curve
ticks.updateDataArray = function() {
var cx = circ.center.X(),
cy = circ.center.Y(),
r = circ.Radius(),
i,
ticklen = 0.3, // Length of ticks in user space coordinates
steps = 12, // Number of ticks
d = ticklen * 0.5,
alpha = 2 * Math.PI / steps;
this.dataX = [];
this.dataY = [];
for (i = 0; i < steps; i++) {
// Start of a tick
this.dataX.push( cx + (r - d)* Math.cos(i * alpha) );
this.dataY.push( cy + (r - d) * Math.sin(i * alpha) );
// End of tick
this.dataX.push( cx + (r + d) * Math.cos(i * alpha) );
this.dataY.push( cy + (r + d) * Math.sin(i * alpha) );
// Interrupt the curve
this.dataX.push( NaN );
this.dataY.push( NaN );
}
};
brd.update();
</script>
</body>
</html>
The tick labels are not getting displayed on the JSXGraph. What is the solution?
In this example, the labels have to be created as separate texts, like this:
var board = JXG.JSXGraph.initBoard('jxgbox',{
axis:false, boundingbox:[-10,10,10,-10], keepaspectratio:true});
var p = board.create('point', [0,0]);
var q = board.create('point', [8,0]);
var circ = board.create('circle', [p, q]);
// Create an empty curve
var ticks = board.create('curve', [[0], [0]],
{strokeWidth: 1,
strokeColor: 'blue',
strokeOpacity: 0.5,
drawLabels: true
});
// Make ticks out of the curve
ticks.updateDataArray = function() {
var cx = circ.center.X(),
cy = circ.center.Y(),
r = circ.Radius(),
i,
ticklen = 0.3, // Length of ticks in user space coordinates
steps = 12, // Number of ticks
d = ticklen * 0.5,
alpha = 2 * Math.PI / steps;
this.dataX = [];
this.dataY = [];
for (i = 0; i < steps; i++) {
// Start of a tick
this.dataX.push( cx + (r - d)* Math.cos(i * alpha) );
this.dataY.push( cy + (r - d) * Math.sin(i * alpha) );
// End of tick
this.dataX.push( cx + (r + d) * Math.cos(i * alpha) );
this.dataY.push( cy + (r + d) * Math.sin(i * alpha) );
// Interrupt the curve
this.dataX.push( NaN );
this.dataY.push( NaN );
}
};
board.update();
var labels = ['0','30','60','90','120','150','180','210','240','270','300','330'];
var labelEls = [];
var deg30 = Math.PI * 30 / 180;
for (let i = 0; i < 12; i++) {
labelEls.push(
board.create('text', [
() => circ.center.X() + (circ.Radius() - 0.5) * Math.cos(deg30 * i),
() => circ.center.Y() + (circ.Radius() - 0.5) * Math.sin(deg30 * i),
labels[i]
], {anchorX: 'middle', anchorY: 'middle'})
);
}
See it live at https://jsfiddle.net/os4hgub5/.