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Add page used to measure text

This commit is contained in:
Frank A. Krueger 2017-12-09 14:46:14 -08:00
parent 503a5b2e45
commit b0311ec22d
1 changed files with 56 additions and 0 deletions
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56
Documentation/MeasureText.html Normal file
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<html>
<body>
<textarea id="result" cols="200" rows="32"></textarea>
<canvas id="canvas" width="320" height="200"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var r = "static readonly double[] CharacterProportions = {\n ";
var head = "";
let size = 16;
ctx.font = "bold " + size + "px \"Helvetica Neue\"";
var mmm = ctx.measureText("MM");
let sp = 0;
let np = 0;
let mw = 0;
for (let i = 0; i < 128; i++) {
if (i > 0 && i % 8 == 0) {
head = ",\n ";
}
else if (i > 0) {
head = ", ";
}
let c = String.fromCharCode(i);
let s = "M" + c + "M";
let m = ctx.measureText(s);
let w = m.width - mmm.width;
let p = w / size;
if (p > 1e-4) {
sp += p;
np++;
}
if (c == "M") {
mw = w;
}
r += head + p;
console.log (c + " = " + w);
}
let ap = sp / np;
let padding = (mmm.width - mw*2)/size;
r += "\n};\nconst double AverageCharProportion = " + ap + ";";
r += "\nconst double StringWidthPaddingProportion = " + padding + ";";
console.log(r);
document.getElementById("result").innerText = r;
</script>
</body>
</html>