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              - var dirs = ['', 'x', 'y'];
- var nd = dirs.length;
- var trfs = [
- 	{
- 		func: { name: 'rotate', min: 0, max: 1 }, 
- 		args: { type: 'ang', min: 0, max: 1, ext: 180, lbl: 'rotation angle' }
- 	}, 
- 	{
- 		func: { name: 'scale', min: 0, max: nd }, 
- 		args: { type: 'num', min: 1, max: nd, ext: 1.5, lbl: 'scaling factor', step: .05 }
- 	}, 
- 	{
- 		func: { name: 'skew', min: 1, max: nd }, 
- 		args: { type: 'ang', min: 0, max: 1, ext: 60, lbl: 'shearing angle' }
- 	}, 
- ];
- var nt = trfs.length;
- var units = {
- 	ang: { deg: 1, rad: Math.PI/180, turn: 1/360/*, grad: .01*/ }, 
- 	len: { '%': 1, px: 1 }
- };

mixin var(name)
	span.token--func var
	span.token--punc (
	span.token--args
		span.token--arg
			span.token--prop --#{name}
	span.token--punc )

mixin perc(val)
	span.token--num #{val}
	span.token--unit %

mixin pad(dir)
	- var dir = dir || 1;
	span.item
		span.token--func translate
		span.token--punc (
		span.token--args
			- for(var i = 1; i < nd; i++) {
				if(i > 1)
					span.token--punc ,
				span.token--arg
					span.token--func calc
					span.token--punc (
						span.token--args
							span.token--arg
								if(dir > 0)
									+perc(50)
								else
									+var(`o${dirs[i]}`)
								|  
								span.token--oper -
								|  
								if(dir < 0)
									+perc(50)
								else
									+var(`o${dirs[i]}`)
					span.token--punc )
			- }
		span.token--punc )
	
mixin trf(pad)
	span.token--prop transform
	span.token--punc :
	span.token--val
		if(pad)
				+pad()
		span.item
			+var('transform')
		if(pad)
			+pad(-1)

pre#code-trf
	- for(var i = 1; i < nd; i++) {
		span.token--prop --o#{dirs[i]}
		span.token--punc :
		span.token--val
			span.item(data-m='1' class=`o${dirs[i]}`)
				span.ctrl
					button.token--num(aria-haspopup='true' aria-expanded='false' aria-controls=`popvalo${dirs[i]}`) #{i*50}
					form.popup(id=`popvalo${dirs[i]}` style=`--min: -50; --val: 0; --max: 150`)
						.wrap
							input(type='range' id=`ro${dirs[i]}` min='-50' value='0' max='150')
							output(for=`ro${dirs[i]}` class=`o${dirs[i]}`) 0
						label(for=`ro${dirs[i]}`) o#{dirs[i]}
				span.token--unit %
		span.token--punc ;
		br
	- }
	span.token--prop --transform
	span.token--punc :
	span#trf-val.token--val
		span.item(data-i='0' data-j='data-i')
			span.ctrl
				button.add.sym(aria-haspopup='true' aria-expanded='false' aria-controls='pop-0' data-j='aria-controls') add
				form#pop-0.popup(data-j='id')
					- for(var i = 0; i < nt; i++) {
						input(type='radio' name='trf-0' id=`${trfs[i].func.name}-0` data-j='name id')
						label.final(for=`${trfs[i].func.name}-0` data-j='for') #{trfs[i].func.name}
					- }
input(type='checkbox' id='concurr')
//label(for='concurr') animate at same time
section#swipe
	pre#code-orig.half
		span.token--prop transform-origin
		span.token--punc :
		span.token--val
			- for(var i = 1; i < nd; i++) {
				span.item
					+var(`o${dirs[i]}`)
			- }
		span.token--punc ;
		br
		+trf
	pre#code-chain.half
		+trf(1)
section#visual
	button#run(disabled) Run
	.box#box-initial(data-txt='transform: none')
	.box#box-origin(data-txt='transform-origin')
		.axes
	.box#box-chain(data-txt='translate()')
		.axes
	.box#box-trigger
		- for(var i = 0; i < nd; i++) {
			- for(var j = 0; j < nd; j++) {
				button.point(style=`--ox: ${i*50}%; --oy: ${j*50}%`)
			- }
		- }
		button.point.sel

template#rem
	span.ctrl
		button.rem.sym remove

- for(var i = 0; i < nt; i++) {
	template(id=trfs[i].func.name)
		- var Δ = trfs[i].func.max - trfs[i].func.min;
		if Δ > 1
			span.ctrl(data-dir=dirs[trfs[i].func.min])
				button.token--func(aria-haspopup='true' aria-expanded='false' aria-controls='popfnc-0' data-j='aria-controls') #{trfs[i].func.name}#{dirs[trfs[i].func.min].toUpperCase()}
				form#popfnc-0.popup(data-j='id')
					- for(var j = trfs[i].func.min; j < trfs[i].func.max; j++) {
						input(type='radio' name=`${trfs[i].func.name}-0` id=`o${trfs[i].func.name}${dirs[j]}-0` data-dir=dirs[j] data-j='name id' checked=(j===trfs[i].func.min))
						label(for=`o${trfs[i].func.name}${dirs[j]}-0` data-j='for') #{trfs[i].func.name}#{dirs[j].toUpperCase()}
						if(!dirs[j])
							input(type='checkbox' id=`${trfs[i].func.name}iso-0` data-j='id')
							label(for=`${trfs[i].func.name}iso-0` data-j='for') isometric
					- }
		else
			span.token--func #{trfs[i].func.name}
		span.token--punc (
		span.token--args
			- for(var j = trfs[i].args.min; j < trfs[i].args.max; j++) {
				if j > trfs[i].args.min
					span.token--punc ,
				span.token--arg(data-m='1' data-dir=dirs[j])
					span.ctrl
						- var max = trfs[i].args.ext, min = -max;
						- var step = trfs[i].args.step;
						- var gen = +(min + (max - min)*Math.random()).toFixed(2);
						- var val = step?gen:Math.round(gen);
						button.token--num(aria-haspopup='true' aria-expanded='false' aria-controls=`popnum${dirs[j]}-0` data-dir=dirs[j]?dirs[j]:null data-j='aria-controls') #{val}
						form.popup(id=`popnum${dirs[j]}-0` style=`--min: ${min}; --val: ${val}; --max: ${max}` data-j='id')
							.wrap
								input(type='range' id=`${trfs[i].args.type}${dirs[j]}-0` min=min max=max value=val step=step?step:null data-j='id')
								output(for=`${trfs[i].args.type}${dirs[j]}-0` data-j='for') #{val}
							label(for=`${trfs[i].args.type}${dirs[j]}-0` data-dir=dirs[j] data-j='for') #{trfs[i].args.lbl}
					if(units[trfs[i].args.type])
						- var def = Object.keys(units[trfs[i].args.type])[0];
						span.ctrl
							button.token--unit(aria-haspopup='true' aria-expanded='false' aria-controls=`popuni${dirs[j]}-0` data-dir=dirs[j]?dirs[j]:null data-j='aria-controls') #{def}
							form.popup(id=`popuni${dirs[j]}-0` data-j='id')
								- for(p in units[trfs[i].args.type]) {
									input(type='radio' name=`unit${trfs[i].args.type}${dirs[j]}-0` id=`unit${p}${dirs[j]}-0` data-val=`${units[trfs[i].args.type][p]}` value=p checked=p===def data-j='name id')
									label(for=`unit${p}${dirs[j]}-0` data-j='for') #{p}
								- }
			- }
		span.token--punc )
- }
            
          
!
            
              @import 'compass/css3';

$dark: #222;
$light: #eee;
$mark-orange: #f90;
$mark-crimson: #a25;
$mark-tomato: #e43;
$mark-palblue: #09d;
$mark-green: #4a5;
$mark-khaki: #683;
$line-h: 1.5;

$track-w: 12.5em;
$track-h: .25em;
$thumb-d: 1.5em;
$dist: $track-w - $thumb-d;

$box-w: 38vmin;
$box-h: .5*$box-w;

//===

@mixin track() {
	box-sizing: border-box;
	border: none;
	width: $track-w; height: $track-h;
	background: $light;
}

@mixin thumb() {
	box-sizing: border-box;
	border: solid 4px #000;
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	background: $light;
}

@mixin thumb-focus {
	border-color: transparent;
	background: $mark-orange
}

// ===

%visually-hidden { opacity: 0 }

// ===

*, :before, :after {
	box-sizing: border-box;
	margin: 0;
	border: none;
	padding: 0;
	font: inherit
}

body, label { font: 1em/#{$line-h} trebuchet ms, sans-serif }

body {
	--ox: 50%; --oy: 100%;
	--transform: unquote(' ');
	--dt: 0s;
	display: flex;
	flex-direction: column;
	overflow-x: hidden;
	min-width: 320px; min-height: 100vh
}

pre, code, .box { font-family: consolas, monaco, monospace }

pre {
	padding: .5em;
	background: $dark;
	color: $light;
	white-space: pre-wrap
}

span, button {
	display: inline-block;
	color: var(--c, inherit)
}

button {
	border-radius: 3px;
	
	&:not([disabled]) { cursor: pointer }
	
	&:focus { outline: solid 1px rgba($light, .05) }
}

form {
	position: absolute;
	z-index: 2;
	background: mix($dark, #000)
}

label {
	display: block;
	line-height: 2
}

code {
	display: block;
	font-weight: 700
}

//===

[id='code-trf'] {
	box-shadow: inset 0 -1px #777, inset 0 -2px #000;
	
	&:after {
		position: absolute;
		top: 0; right: 0;
		padding: 0 .5em;
		border-radius: 0 0 0 5px;
		--left: calc(var(--max) - var(--curr));
		background: hsl(calc(var(--left)*13), 100%, 35%);
		font-weight: 700;
		counter-reset: max var(--max) curr var(--curr) left var(--left);
		content: counter(curr) ' (max of ' counter(max) '), ' counter(left) ' left'
	}
}

.token {
	&--prop { --c: #DBBAE5 }
	
	&--func { --c: #B7E3C0 }
	
	&--val {
		span[class^='o'] { margin-left: .5em }
	}
	
	&--num {
		--c: #F8F087;
		
		.ctrl & {
			min-width: $line-h*1em;
			text-align: right
		}
	}
	
	&--unit { --c: #F39DD4 }
	
	&--oper { --c: #B8D0DD }
	
	[data-dir='x'] ~ &--args & {
		&--punc, &--arg[data-dir='y'] { display: none }
	}
	
	[data-dir='y'] ~ &--args & {
		&--punc, &--arg[data-dir='x'] { display: none }
	}
}

.item {	
	&:before {
		white-space: pre;
		content: ' '
	}
}

.ctrl {
	position: relative;
	margin: .125em 1px;
	white-space: normal;
	
	&.iso[data-dir=''] ~ .token--args {
		.token--punc, .token--arg[data-dir='y'] { display: none }
	}
}

[disabled] {
	&, + label { filter: saturate(.3) contrast(.3) }
}

.sym {
	overflow: hidden;
	margin-right: .25em;
	width: $thumb-d; height: $thumb-d;
	background: $light;
	color: $dark;
	text-indent: -100vw;
	vertical-align: middle;
	
	&:not([disabled]) {
		&:hover, &:focus {
			background: var(--c) 
				linear-gradient(rgba($dark, .35), rgba($dark, 0));
			color: $light;
		}
	}
	
	&:after {
		display: flex;
		align-items: center;
		justify-content: center;
		position: absolute;
		top: 0; right: 0; bottom: 0; left: 0;
		transform: scale(1.5);
		font-weight: 900;
		text-indent: -.125em;
		text-shadow: -.5px -.5px mix($dark, $light, 25%)
	}
}

.add {
	--c: #{$mark-green};
	
	&:after { content: '+' }
}

.rem {
	--c: #{$mark-tomato};
	
	&:after { content: '-' }
}

[aria-haspopup] {
	font-weight: 700;
	
	&:not(.sym) {
		padding: 0 1px;
		background: none;
		
		&:hover, &:focus { box-shadow: inset 0 0 0 1px var(--c) }
	}
	
	&[aria-expanded='true']:not(.sym) {
		box-shadow: none;
		background: var(--c);
		color: $dark
	}
}

.popup {
	margin-top: .25em;
	padding: .5em;
	border-radius: 3px;
	transform-origin: 50% 0;
	--pos: translate(var(--x, 0)) perspective(35em);
	transform: var(--pos);
	box-shadow: 0 0 0 1px $mark-orange;
	//transition: transform .3s;
	
	[aria-expanded='false'] + & {
		display: none;
		//transform: var(--pos) rotatex(-90deg);
	}
}

[type='radio'], [type='checkbox'] {
	position: absolute;
	left: -100vw;
	
	+ label {
		--c: var(--c-sel, var(--c-hl));
		--c-hl: #{$light};
		color: var(--c);
		cursor: pointer;
		
		&:not(.final) {
			display: flex;
			align-items: center;
			margin-right: .25em;

			&:before {
				margin-right: .25em;
				width: $thumb-d; height: $thumb-d;
				transform: scale(.75);
				box-shadow: 0 0 0 2px var(--c);
				color: var(--c-sel, transparent);
			}
		}
	}
	
	&:focus + label, &:not([disabled]) + label:hover {
		--c-hl: #{mix($light, $mark-orange)}
	}
	
	&:checked + label { --c-sel: #{$mark-orange} }
}

[type='radio'] + :not(.final):before {
	border-radius: 50%;
	padding: .25*$thumb-d;
	background: currentcolor content-box;
	content: ''
}

[type='checkbox'] + label {
	.popup & {
		margin-bottom: .75em;
		margin-left: 1em
	}
	
	&:before {
		display: flex;
		align-items: center;
		justify-content: center;
		content: '✔'
	}
}

.wrap {
	position: relative;
	width: $track-w; height: 2*$thumb-d;
	
	~ label { text-align: center }
}

[type='range'] {
	&, &::-webkit-slider-thumb { -webkit-appearance: none }
	
	display: block;
	width: $track-w; min-height: $thumb-d;
	background: transparent;
	cursor: pointer;
	
	&::-webkit-slider-runnable-track { @include track() }
	&::-moz-range-track { @include track }
	&::-ms-track { @include track }

	&::-webkit-slider-thumb {
		margin-top: .5*($track-h - $thumb-d);
		@include thumb
	}
	&::-moz-range-thumb { @include thumb }
	&::-ms-thumb {
		margin-top: 0;
		@include thumb
	}

	&::-ms-tooltip { display: none }
	
	+ output {
		display: none;
		
		.js & {
			position: absolute;
			left: .5*$thumb-d; top: calc(#{$thumb-d} + .125em);
			padding: 0 .5em;
			border-radius: 3px;
			transform: translate(calc((var(--val) - var(--min))/(var(--max) - var(--min))*#{$dist} - 50%));
			background: $mark-orange;
			color: #000
		}
	}
	
	&:focus {
		outline: dashed 1px rgba(#000, .05);
		
		&::-webkit-slider-thumb { @include thumb-focus }
		&::-moz-range-thumb { @include thumb-focus }
		&::-ms-thumb { @include thumb-focus }
		
		.js & + output { display: block }
	}
}

[for='concurr'] {
	position: absolute;
	z-index: 2;
	bottom: 0;
	padding: 0 .5em;
	background: $dark;
}

[id='swipe'] {
	[id='concurr']:not(:checked) ~ & {
		display: flex;
		width: 200%;
		transform: translate(var(--tx, 0));
		
		.half {
			width: 50%;
		}
	}
	
	&.left {
		--tx: -50%;
		
		:not(.running) > :not(:checked) + * + & + * [id='box-origin'] { @extend %visually-hidden }
	}
	
	:not(.running) > :not(:checked) + * + &:not(.left) + * [id='box-chain'] { @extend %visually-hidden }
	
	&.smooth { transition: .3s transform }
}

.half {
	position: relative;
	padding-top: $line-h*1em;
	
	&:before {
		position: absolute;
		top: 0; left: 0;
		padding: 0 .5em;
		border-radius: 0 0 5px 0;
		background: gold;
		color: $dark;
	}
}

[id='code-orig'] {
	&:before {
		content: 'option 1: use transform-origin'
	}
	
	output:after { content: '%' }
}

[id='code-chain'] {
	&:before {
		content: 'option 2: use chained translations'
	}
}

[id='visual'] {
	flex: 1;
	overflow: hidden;
	position: relative;
	min-height: 320px;
}

[id='run'] {
	position: absolute;
	margin: .5em;
	padding: .125em .5em;
	z-index: 3;
}

.box {
	--j: 1;
	position: absolute;
	top: 50%; left: 50%;
	min-width: 10em; min-height: 3*$line-h*1em;
	width: $box-w; height: $box-h;
	--pos: translate(-50%, -50%);
	transform: var(--pos);
	font-weight: 700;
	
	&:after {
		position: absolute;
		left: 50%; top: calc(var(--j)*25%);
		padding: 0 .25em;
		border-radius: 5px;
		transform: var(--pos);
		background: var(--c, transparent);
		white-space: nowrap;
		content: attr(data-txt)
	}
}

[id='box-initial'] {
	background: $light;
	
	code { margin-left: .5em }
}

[id='box-origin'], [id='box-chain'] {
	box-shadow: inset 0 0 0 2px var(--c);
	background: repeating-linear-gradient(var(--a, 45deg), var(--c), var(--c) 2px, transparent 2px, transparent 7px);
	transition: opacity .3s;
	
	[id='run'][disabled] ~ & { @extend %visually-hidden }
}

[id='box-origin'] {
	--j: 2;
	--c: #{rgba($mark-palblue, .5)};
	transform-origin: var(--ox) var(--oy);
	transform: var(--pos) var(--transform);
	
	.axes { top: var(--oy); left: var(--ox) }
	
	.running [id='concurr']:checked ~ * &, 
	.running [id='swipe']:not(.left) ~ * & {
		animation: ani0 var(--dt) ease-out;
	}
}

[id='box-chain'] {
	--j: 3;
	--c: #{rgba($mark-crimson, .5)};
	--a: -45deg;
	--dir: translate(calc(var(--ox) - 50%), calc(var(--oy) - 50%));
	--rev: translate(calc(50% - var(--ox)), calc(50% - var(--oy)));
	transform: var(--pos) 
		var(--dir)
		var(--transform) 
		var(--rev);
	
	.axes { top: 50%; left: 50% }
	
	.running [id='concurr']:checked ~ * &, 
	.running [id='swipe'].left ~ * & {
		animation: ani1 var(--dt) ease-out;
	}
}

.axes {
	position: absolute;
	width: 65%; height: 65%;
	box-shadow: -1px -1px currentcolor, 
		inset 1px 1px currentcolor;
	
	&:before, &:after {
		position: absolute;
		border: .375em solid transparent;
		width: 0; height: 0;
		transform: translatey(-50%);
		font: italic 700 1em/ .75 times new roman, serif;
		text-indent: -.25em;
		text-shadow: 1px 1px #fff, -1px -1px #fff;
		content: 'x'
	}
	
	&:before {
		left: calc(100% - 2px);
		border-left-width: .75em;
		border-left-color: currentcolor;
	}
	
	&:after {
		top: calc(100% - 2px);
		border-top-width: .75em;
		border-top-color: currentcolor;
		transform: translate(-50%);
		line-height: 0;
		text-indent: .25em;
		content: 'y'
	}
}

[id='box-trigger'] {
	&:before {
		position: absolute;
		top: 0; right: 0; bottom: 0; left: 0;
		transform: scale(2);
		content: ''
	}
}

.point {
	position: absolute;
	left: var(--ox); top: var(--oy);
	margin: -.5*$thumb-d;
	border: solid 4px var(--c, transparent);
	padding: 4px;
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	background: var(--c, #{$mark-tomato}) content-box;
	opacity: .5;
	filter: drop-shadow(0 0 1px #fff) drop-shadow(1px 1px 1px #000);
	
	&:hover, &:focus {
		opacity: 1;
		--c: #{$mark-orange};
	}
	
	&.sel {
		opacity: 1;
		--c: #{$mark-green}
	}
}
            
          
!
            
              const DIRS = ['x', 'y'], TRF = {}, O = {}, 
			LIM = 8, PREC = 3, 
			_SWIPE = document.getElementById('swipe'), 
			_BOXO = document.getElementById('box-origin'), 
			_BOXC = document.getElementById('box-chain'), 
			_TRIG = document.getElementById('box-trigger'), 
			_RUN = document.getElementById('run'), 
			_S = document.createElement('style'), 
			BT = .5;

let popup = null, poplock = false, limreach = false, 
		r = null, act = null, x0 = null, y0 = null, running = false;

function fitPopup(_el) {
	let cr = _el.getBoundingClientRect(), 
			dx = r.right - cr.right;
	
	if(dx < 0) _el.style.setProperty('--x', `${Math.round(dx) - 1}px`)
};

function closePopup() {
		/*
	 * close the currently open popup
	 * there can be only one, stored in 
	 * global popup variable
	 */
	popup.previousElementSibling
		.setAttribute('aria-expanded', false);
	popup = null;
};

function size() {	
	r = document.body.getBoundingClientRect();
	
	if(popup) closePopup();
};

function isIn(_el, cls) {
	/*
	 * ckecks if _el or any of its ancestors
	 * all the way up to the body have the 
	 * cls class
	 */
	
	if(_el === document.body) return false;
	return (_el.classList.contains(cls) ? 
		true : isIn(_el.parentNode, cls))
};

function getAsc(_el, cls) {
	/*
	 * get an ancestor of _el that has class cls
	 */
	if(_el === document.body) return null;
	
	return _el.classList.contains(cls) ? 
		_el : getAsc(_el.parentNode, cls)
};

function updateIndices(i, dir = 1) {
	let n = +TRF._last.dataset.i + dir;
	
	for(let j = i; j <= n; j++) {
		let list = [ j < n ? TRF.chain.list[j]._el : TRF._last];
		
		list.push(...Array.from(list[0].querySelectorAll('[data-j]')));
		
		list.forEach(c => {
			let attr = c.dataset.j.split(' ');
			
			attr.forEach(k => {
				let curr = c.getAttribute(k).split('-');
				
				curr[curr.length - 1] = j;
				
				c.setAttribute(k, curr.join('-'));
			});
		});
	}
	
	document.body.style.setProperty('--curr', TRF.chain.list.length);
}

function textFrom(item) {
	return `${item._fn.textContent.replace(/scale(X|Y)/gi, 'scale')}(${item._nums.map((c, j) => c.textContent + (item._unis.length ? item._unis[j].textContent : '')).join(', ')})`;
};

function prepAni() {
	let n = TRF.chain.text.length + 4, 
			ani = [], u = 100/n;
	
	for(var i = 0; i < 2; i++) {
		let dir = ' var(--dir)', 
				kd = `${2*u}% { transform: var(--pos)${dir} }`, 
				rev = ' var(--rev)', 
				kr = `${(n - 2 + i)*u}%, 100% { transform: var(--pos)${dir} ${TRF.chain.text.join(' ')}${rev}`;
		
		ani[i] = `@keyframes ani${i} {
	0%, ${(2 - i)*u}% { transform: var(--pos) }
	${i ? kd : ''}
	${TRF.chain.text.map((c, j, a) => {
		return `${(3 + j)*u}%${!i && j === TRF.chain.text.length - 1 ? ', 100%': ''} { transform: var(--pos)${i ? dir : ''} ${a.slice(0, j + 1).join(' ')} }`
	}).join('\n')}
	${i ? kr : ''}
}`
	}
		
	_S.textContent = ani.join('');
};

function updateTrf() {
	document.body.style.setProperty('--transform', TRF.chain.text.join(' '));
	if(TRF.chain.text.length) prepAni();
	else _S.textContent = ''
};

function addTrf(data, nxt) {
	let item = {
				_el: TRF.temp._item.cloneNode(true), 
				name: data.name, 
				iso: false
			}, 
			fblock = TRF.temp[`_${data.name}`].cloneNode(true), 
			i = +nxt.dataset.i;
	
	item._el.appendChild(TRF.temp._rem.cloneNode(true));
	item._el.appendChild(fblock);
		
	item._fn = item._el.querySelector('.token--func');
	item._nums = Array.from(item._el.querySelectorAll('.token--num'));
	item._unis = Array.from(item._el.querySelectorAll('.token--unit'));
	
	TRF._adds.splice(i, 0, item._el.querySelector('.add'));
	
	TRF.chain.list.splice(i, 0, item);
	TRF.chain.text.splice(i, 0, textFrom(item));
	updateTrf();
	updateIndices(i);
	TRF._wrap.insertBefore(item._el, nxt);
	
	if(TRF.chain.list.length && _RUN.disabled) _RUN.disabled = false;
};

function remTrf(i) {
	TRF._wrap.removeChild(TRF.chain.list[i]._el);
	
	TRF._adds.splice(i, 1);
	TRF.chain.list.splice(i, 1);
	TRF.chain.text.splice(i, 1);
	updateTrf();
	updateIndices(i, -1);
	
	if(limreach) {
		TRF._adds.forEach(c => { c.removeAttribute('disabled') });
		limreach = false;
	}
	
	if(!TRF.chain.list.length && !_RUN.disabled) _RUN.disabled = true
};

function rangeUpdate(_t) {
	if(_t.type !== 'range') return;	
	
	let _pop = getAsc(_t, 'popup'), 
			_num = _pop.previousElementSibling, 
			_out = _t.nextElementSibling, 
			_arg = _num.parentNode.parentNode, 
			m = +_arg.dataset.m, 
			val = +_t.value;
	
	_pop.style.setProperty('--val', val);
	_num.textContent = _out.textContent = +(m*val).toFixed(PREC);
	
	DIRS.forEach(c => {
		if(_arg.classList.contains(`o${c}`)) {
			document.body.style.setProperty(`--o${c}`, `${val}%`);
			
			O[c]._num.forEach(k => { k.textContent = val })
			O[c]._unit.forEach(k => { k.textContent = '%' })
		}
	});
	
	if(_t.id.indexOf('-') !== -1) {
		let i = +_t.id.split('-')[1], 
				item = TRF.chain.list[i];
		
		if(item.iso) {
			let _arg2 = _arg.nextElementSibling.nextElementSibling, 
					_num2 = _arg2.querySelector('.token--num'), 
					_pop2 = _num2.nextElementSibling, 
					_in2 = _arg2.querySelector('input'), 
					_out2 = _arg2.querySelector('input');

			_pop2.style.setProperty('--val', val);
			_num2.textContent = _in2.value = _out2.value = +(m*val).toFixed(PREC);
		}
		
		TRF.chain.text[i] = textFrom(item);
		updateTrf();
	}
};

function getE(ev) {
	/* to unify click and touch */
	return ev.touches ? ev.touches[0] : ev;
};

function lock(e, aname) {
	/*
	 * lock in some values at the start of an action
	 * like swipe, drag
	 */
	
	act = aname;
	x0 = e.clientX;
	y0 = e.clientY;
	
	if(aname === 'swipe') _SWIPE.classList.remove('smooth')
};

function preswipe(e) {
	/*
	 * move panels a bit while the cursor is still moving and
	 * mouseup/ touchend haven't been triggered yet
	 */
	
	let x = e.clientX, 
			dx = x - x0, 
			s = 1*(dx > 0), 
			f = +(dx/r.width).toFixed(2);
	
	if((dx > 0 && _SWIPE.classList.contains('left')) || 
		 (dx < 0 && !_SWIPE.classList.contains('left'))) {
		
		running = false;
		_RUN.textContent = 'Run';
		document.body.style.setProperty('--dt', '0s');
		document.body.classList.remove('running');
		
		_SWIPE.style.setProperty('--tx', `${(f - s)*50}%`);
	}
};

function swipe() {
	/*
	 * fully move from one code option panel to the other
	 * on mouseup/ touchend
	 */
	
	if((!_SWIPE.classList.contains('left') && 
			getComputedStyle(_SWIPE).getPropertyValue('--tx').trim() != 0) || 
		 (_SWIPE.classList.contains('left') && 
			getComputedStyle(_SWIPE).getPropertyValue('--tx').trim() != '-50%')) {
		_SWIPE.classList.add('smooth');
		_SWIPE.style.removeProperty('--tx');
		_SWIPE.classList.toggle('left');
	}
	
	act = null;
};

function downact(e) {
	/*
	 * decides whether to start a swipe or drag action
	 * called on mousedown/ touchstart
	 */
	
	const _T = e.target;
	
	if(_T.className.indexOf('token') === -1) lock(getE(e), 'swipe');
};

function moveact(e) {
	/*
	 * decides whether to start a preswipe or predrag action
	 * called on mousemove/ touchmove
	 */
	
	if(act === 'swipe') preswipe(getE(e));
};

function upact(e) {
		/*
	 * decides whether to end a swipe or drag action
	 * called on mouseup/ touchend
	 */
	
	if(act === 'swipe') swipe();
};

(function init() {
	let _temp = Array.from(document.querySelectorAll('template'));
	
	document.documentElement.classList.add('js');
	size();
		
	TRF._wrap = document.getElementById('trf-val');
	
	TRF._last = TRF._wrap.querySelector('.item');
	
	TRF.temp = { _item: TRF._last.cloneNode(true) };
	
	_temp.forEach(_c => {
		TRF.temp[`_${_c.id}`] = document.importNode(_c.content, true);
	});
	
	TRF.chain = { list: [], text: []	};
	
	TRF._adds = [TRF._last.querySelector('.add')];
		
	DIRS.forEach(c => {
		O[c] = {
			_num: Array.from(document.querySelectorAll(`.o${c} .token--num`)), 
			_unit: Array.from(document.querySelectorAll(`.o${c} .token--unit`)), 
			_pop: document.querySelector(`.o${c} .popup`), 
			_in: document.querySelector(`.o${c} input`), 
			_out: document.querySelector(`.o${c} output`)
		}
	});
	
	document.body.appendChild(_S);
	document.body.style.setProperty('--max', LIM)
	document.body.style.setProperty('--curr', 0)
})();

addEventListener('click', e => {
	let _t = e.target;
	
	if(_t.hasAttribute('aria-haspopup')) {
		let _nxt = _t.nextElementSibling;
		
		if(popup !== _nxt) {
			let _check = _nxt.querySelector(':checked');
			
			if(popup) closePopup();
			
			if(_check !== null && _check.nextElementSibling.classList.contains('final'))
				_check.checked = false;
			
			popup = _nxt;			
			_t.setAttribute('aria-expanded', poplock = true);
			
			fitPopup(_nxt);
			
			setTimeout(() => { poplock = false }, 500);
		}
		
		return
	}
	else if(popup && !isIn(_t, 'popup')) {
		closePopup();
		return
	}
	
	if(_t.classList.contains('final')) {
		let _prv = _t.previousElementSibling;
		
		addTrf({ name: _t.textContent }, getAsc(_t, 'item'));
		
		closePopup();
		
		if(+TRF._last.dataset.i === LIM) {
			TRF._adds.forEach(c => { c.setAttribute('disabled', true) });
			limreach = true;
		}
		
		return
	}
	
	if(_t.classList.contains('rem')) {
		remTrf(+getAsc(_t, 'item').dataset.i);
		
		return;
	}
	
	if(_t.classList.contains('point')) {		
		DIRS.forEach(c => {
			let num = +_t.style.getPropertyValue(`--o${c}`).trim().replace('%', '');
			
			document.body.style.setProperty(`--o${c}`, `${num}%`);
			
			O[c]._num.forEach(k => { k.textContent = num })
			O[c]._unit.forEach(k => { k.textContent = '%' })
			O[c]._pop.style.setProperty(`--val`, O[c]._in.value = O[c]._out.value = num);
		});
		
		
	}
	
	if(_t.id === 'run') {
		running = !running;
		
		_RUN.textContent = running ? 'Stop' : 'Run';
		
		document.body.style.setProperty('--dt', `${running*(TRF.chain.list.length + 4)*BT}s`);
		document.body.classList.toggle('running', running);
		_SWIPE.classList.add('smooth');
	}
}, false);

addEventListener('resize', size, false);

addEventListener('keyup', e => {
	if(popup) {
		let kc = e.keyCode;
		
		if(!poplock && (kc === 13 || kc === 32)) 
			closePopup()
	}
}, false);

addEventListener('input', e => rangeUpdate(e.target), false);

addEventListener('change', e => {
	let _t = e.target;
	
	if(_t.type === 'range') {
		rangeUpdate(_t);
		return
	}
	
	if(_t.type === 'radio') {
		let _lbl = _t.nextElementSibling;
		
		if(!_lbl.classList.contains('final')) {
			let _btn = getAsc(_t, 'popup').previousElementSibling, 
					i = +_t.id.split('-')[1], 
					item = TRF.chain.list[i];
			
			_btn.textContent = _lbl.textContent;
			
			if(_btn.classList.contains('token--func')) {
				let dir = _t.dataset.dir, 
						_ctrl = _btn.parentNode, 
						_args = Array.from(item._el.querySelectorAll('.token--arg')), 
						_iso = item._el.querySelector('[type=checkbox]');

				_ctrl.dataset.dir = dir;
				
				if(item.name === 'scale') {
					if(dir !== '') {
						_iso.disabled = true;

						_args.forEach(_c => {
							if(_c.dataset.dir !== dir) {
								let _num = _c.querySelector('.token--num'), 
										_pop = _num.nextElementSibling, 
										_in = _pop.querySelector('input'), 
										_out = _pop.querySelector('output');

								_pop.style.setProperty('--val', _num.textContent = _in.value = _out.value = 1);
							}
						});
					}
					else {
						_iso.disabled = false;

						if(item.iso) {
							let val = +_args[0].querySelector('.token--num').textContent;

							_args.forEach((_c, i, a) => {
								if(i > 0) {
									let _num = _c.querySelector('.token--num'), 
											_pop = _num.nextElementSibling, 
											_in = _pop.querySelector('input'), 
											_out = _pop.querySelector('output');

									_pop.style.setProperty('--val', _num.textContent = _in.value = _out.value = val);
								}
							});
						}
					}
				}
			}
			else if(_btn.classList.contains('token--unit')) {
				let _arg = _btn.parentNode.parentNode, 
						_num = _arg.querySelector('.token--num'), 
						_out = _arg.querySelector('output'), 
						m = +_t.dataset.val, 
						val = +_arg.querySelector('[type=range]').value;

					_btn.textContent = _lbl.textContent;
					_arg.dataset.m = m;
					_num.textContent = _out.textContent = +(m*val).toFixed(PREC);
				}
			
			TRF.chain.text[i] = textFrom(item);
			updateTrf();
			return;
		}
	}
	
	if(_t.type === 'checkbox') {
		let i = +_t.id.split('-')[1], 
				item = TRF.chain.list[i], 
				_ctrl = getAsc(_t, 'ctrl'), 
				_args = Array.from(item._el.querySelectorAll('.token--arg'));
		
		_ctrl.classList.toggle('iso');
		
		item.iso = !item.iso;
		
		if(item.iso) {
			let val = +_args[0].querySelector('.token--num').textContent;

			_args.forEach((_c, i, a) => {
				if(i > 0) {
					let _num = _c.querySelector('.token--num'), 
							_pop = _num.nextElementSibling, 
							_in = _pop.querySelector('input'), 
							_out = _pop.querySelector('output');

					_pop.style.setProperty('--val', _num.textContent = _in.value = _out.value = val);
				}
			});
		}
		
		TRF.chain.text[i] = textFrom(item);
		updateTrf();
		return;
	}
}, false);

addEventListener('mousedown', downact, false);
addEventListener('touchstart', downact, false);

addEventListener('mousemove', moveact, false);
addEventListener('touchmove', moveact, false);

addEventListener('mouseup', upact, false);
addEventListener('touchend', upact, false);

document.body.addEventListener('mouseout', upact, false);

addEventListener('animationend', e => {
	_SWIPE.classList.toggle('left')
}, false);
            
          
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