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Text size based on physical letter size
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var setTextMeasure = function (contentElement, targetMeasure, maxSize, minSize) { | |
if (!contentElement) contentElement = document.createElement('p'); | |
if (!targetMeasure) targetMeasure = 66; | |
if (!maxSize) maxSize = 16; | |
if (!minSize) minSize = 9; | |
var sizer = contentElement.cloneNode(); | |
sizer.style.cssText = 'margin: 0; padding: 0; color: transparent; background-color: transparent; position: absolute;'; | |
var letters = 'aaaaaaaabbcccddddeeeeeeeeeeeeeffgghhhhhhiiiiiiijkllllmmnnnnnnnooooooooppqrrrrrrsssssstttttttttuuuvwxyyz'; | |
sizer.textContent = letters; | |
document.body.appendChild(sizer); | |
var characterWidth = sizer.offsetWidth / letters.length; | |
document.body.removeChild(sizer); | |
var contentWidth = contentElement.offsetWidth; | |
var measuredFontSize = parseFloat( | |
document.defaultView. | |
getComputedStyle(document.body, null). | |
getPropertyValue('font-size'). | |
replace('px', '') ); | |
var actualMeasure = contentWidth / characterWidth; | |
var newMeasure = measuredFontSize * actualMeasure / targetMeasure; | |
if (newMeasure > maxSize) newMeasure = maxSize; | |
if (newMeasure < minSize) newMeasure = minSize; | |
document.body.style.fontSize = newMeasure + "px"; | |
} |
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