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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | 1x 1x 1x 1x 656x 1097x 581x 581x 581x 490x 490x 490x 362x 362x 55x 55x 9x 9x 8x 8x 11x 11x 31x 31x 6x 6x 581x 32x 581x 34x 34x 22x 12x 12x 12x 12x 67x 32x | const MarginValueRegex = /(-?\d+(\.\d+)?)([a-z]+|%)/;
// According to https://developer.mozilla.org/en-US/docs/Glossary/CSS_pixel, 1in = 96px
const PixelPerInch = 96;
const DefaultRootFontSize = 16;
/**
* Parse unit value with its unit
* @param value The source value to parse
* @param currentSizePxOrElement The source element which has this unit value, or current font size (in px) from context.
* @param resultUnit Unit for result, can be px or pt. @default px
*/
export function parseValueWithUnit(
value: string = '',
currentSizePxOrElement?: number | HTMLElement,
resultUnit: 'px' | 'pt' = 'px'
): number {
const match = MarginValueRegex.exec(value);
let result = 0;
if (match) {
const [_, numStr, __, unit] = match;
const num = parseFloat(numStr);
switch (unit) {
case 'px':
result = num;
break;
case 'pt':
result = ptToPx(num);
break;
case 'em':
result = getFontSize(currentSizePxOrElement) * num;
break;
case 'ex':
result = (getFontSize(currentSizePxOrElement) * num) / 2;
break;
case '%':
result = (getFontSize(currentSizePxOrElement) * num) / 100;
break;
case 'in':
result = num * PixelPerInch;
break;
case 'rem':
result = (getFontSize(currentSizePxOrElement) || DefaultRootFontSize) * num;
break;
}
}
if (result > 0 && resultUnit == 'pt') {
result = pxToPt(result);
}
return result;
}
function getFontSize(currentSizeOrElement?: number | HTMLElement): number {
Iif (typeof currentSizeOrElement === 'undefined') {
return 0;
} else if (typeof currentSizeOrElement === 'number') {
return currentSizeOrElement;
} else {
const styleInPt =
currentSizeOrElement.ownerDocument.defaultView?.getComputedStyle(currentSizeOrElement)
.fontSize ?? '';
const floatInPt = parseFloat(styleInPt);
const floatInPx = ptToPx(floatInPt);
return floatInPx;
}
}
function ptToPx(pt: number): number {
return Math.round((pt * 4000) / 3) / 1000;
}
function pxToPt(px: number) {
return Math.round((px * 3000) / 4) / 1000;
}
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