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Use transform to fit slide into browser window #6

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Use transform to fit slide into browser window #6

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42 changes: 25 additions & 17 deletions weenote.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,26 +5,34 @@ onload = function() {

function fit(el) {
var style = el.style
var i = 1000
var top
var left

style.display = "inline"
style.fontSize = i + "px"
var font = 200
var margin = 15;
var width, height;
var scalex, scaley, scale;

style.fontSize = font + "px"
style.position = "absolute"

while (1) {
left = innerWidth - el.offsetWidth
top = innerHeight - el.offsetHeight

if (top > 0 && left > 0) break

style.fontSize = (i -= i * 0.05) + "px"
style.display = "block"
width = innerWidth - 2*margin;
height = innerHeight - 2*margin;
style.margin = margin + "px";

scalex = width/el.offsetWidth
scaley = height/el.offsetHeight

if (scalex > scaley) {
scale = scaley;
// Center the content horizontally
style.left = (innerWidth - el.offsetWidth*scale)/2 + "px";
} else {
scale = scalex;
// Center the contetent vertically
style.top = (innerHeight - el.offsetHeight*scale)/2 + "px";
}

style.display = "block"
style.top = top / 2 + "px"
style.left = left / 2 + "px"
style["transform-origin"] = "0 0"
style.transform = `scale(${scale})`

}

for (var el, count = 0; el = body.firstChild;) {
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