FontGetFontMetrics

FontGetFontMetrics function

Get glyph count of font.

function FontGetFontMetrics(
    fileBlob,
    fileName
)

Parameter	Type	Description
fileBlob	Blob object	Content of source font for convert.
fileName	string	File name.

Return Value

JSON object

Field	Description
errorCode	code error (0 no error)
errorText	text error ("" no error)
metrics	JSON object
* ascent
* descent
* lineGap
* advanceWidthMax
* minLeftSideBearing
* minRightSideBearing
* xMaxExtent

Examples

Web Worker example:

  /*Create Web Worker*/
  const AsposeFontWebWorker = new Worker("AsposeFontforJS.js");
  AsposeFontWebWorker.onerror = (evt) => console.log(`Error from Web Worker: ${evt.message}`);
  AsposeFontWebWorker.onmessage = (evt) => document.getElementById("output").textContent =
    evt.data == "ready"
      ? "loaded!"
      : evt.data.json.errorCode == 0
      ? JSON.stringify(json).replace('"errorCode":0,"errorText":"",','')
      : `Error: ${evt.data.json.errorText}`;

  /*Event handler*/
  const ffileFontGetMetrics = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*Get metrics of font - Ask Web Worker*/
      AsposeFontWebWorker.postMessage({ "operation": 'AsposeFontGetMetrics', "params": [event.target.result, e.target.files[0].name] }, [event.target.result]);
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

Simple example:

  var ffileFontGetGlyphCount = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      const json = FontGetFontMetrics(event.target.result, e.target.files[0].name);
      if (json.errorCode == 0) {
        document.getElementById('output').textContent = "Glyph count: " + json.glyphCount;
      }
      else document.getElementById('output').textContent = json.errorText;
    }
    file_reader.readAsArrayBuffer(e.target.files[0]);
  }