bernii/gauge.js

difficulty rendering the gauge template on a canvas

sidtupper opened this issue · 2 comments

sidtupper commented

I'm having difficulty getting the gauge template to render on a canvas. dist/gauge.js and index.html are in the server root directory. The border appears, but nothing else. I'd be really grateful to have comments on this index.html code:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>gauge</title>

<script>
src="dist/gauge.js"

var opts = {
  angle: 0.15, /// The span of the gauge arc
  lineWidth: 0.44, // The line thickness
  pointer: {
    length: 0.9, // Relative to gauge radius
    strokeWidth: 0.035 // The thickness
  },
  colorStart: '#6FADCF',   // Colors
  colorStop: '#8FC0DA',    // just experiment with them
  strokeColor: '#E0E0E0'   // to see which ones work best for you
};
var target = document.getElementById('demo'); // your canvas element
var gauge = new Gauge(target).setOptions(opts); // create sexy gauge!

document.getElementById("preview-textfield").className = "preview-textfield";
gauge.setTextField(document.getElementById("preview-textfield"));

gauge.maxValue = 3000; // set max gauge value
gauge.setMinValue(0);  // set min value
gauge.set(1250); // set actual value
gauge.animationSpeed = 32;

</script>
</head>

<body>
<canvas id="demo"> width="400" height="400" style="border:1px solid #000000"</canvas>
</body>
</html>
kplindegaard commented

Your html is ill-formed. Try this instead, but first I would recommend that you diff the two alternatives to spot the differences.

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>gauge</title>
<script src="dist/gauge.js"></script>
</head>

<body>
<canvas id="demo" width="400" height="400" style="border:1px solid #000000"></canvas>
<div id="preview-textfield"></div>
<script type="application/javascript">

var opts = {
  angle: 0.15, /// The span of the gauge arc
  lineWidth: 0.44, // The line thickness
  pointer: {
    length: 0.9, // Relative to gauge radius
    strokeWidth: 0.035 // The thickness
  },
  colorStart: '#6FADCF',   // Colors
  colorStop: '#8FC0DA',    // just experiment with them
  strokeColor: '#E0E0E0'   // to see which ones work best for you
};
var target = document.getElementById('demo'); // your canvas element
var gauge = new Gauge(target).setOptions(opts); // create sexy gauge!

document.getElementById("preview-textfield").className = "preview-textfield";
gauge.setTextField(document.getElementById("preview-textfield"));

gauge.maxValue = 3000; // set max gauge value
gauge.setMinValue(0);  // set min value
gauge.set(1250); // set actual value
gauge.animationSpeed = 32;

</script>
</body>
</html>
sidtupper commented