cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              [[[https://codepen.io/thebabydino/pen/zEbVPO]]]

- var o = -.5*d, r = .43*d;
- var a0 = 198*Math.PI/180, a1 = 225*Math.PI/180;
- var x0 = Math.round(r*Math.cos(a0));
- var y0 = Math.round(r*Math.sin(a0));
- var x1 = Math.round(r*Math.cos(a1));
- var y1 = Math.round(r*Math.sin(a1));

svg#demo(viewBox=[o, o, 2*d, d].join(' '))
	style
		| svg { font: #{fs}px consolas, monaco, monospace }
	marker#end(markerWidth=ad markerHeight=ad 
						viewBox='0 -4 8 8' 
						orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	g#arc
		circle(r=r)
		path(d=`M${x0} ${y0} A${r} ${r} 0 0 1 ${x1} ${y1}`)
	use(xlink:href='#arc' x=d)
            
          
!
            
              $demo-dark: #333;
$demo-light: #ccc;
$demo-ll: #95a;
$demo-hl: #f90;

body {
	display: flex;
	margin: 0;
	height: 100vh
}

svg {
	display: block;
	width: 100vw;
	color: $demo-light
}

path { fill: none }

circle {
	fill: currentcolor;
	stroke: $demo-dark;
	stroke-width: 5px
}

text {
	fill: currentcolor;
	color: #777
}

[id='end'] path {
	fill: #b53
}

[id='arc'] {
	* { fill: none }
	
	circle { stroke: $demo-light }
	
	path {
		stroke: #b53;
		stroke-width: 7px;
		marker-end: url(#end)
	}
}

.curves {
	stroke: transparent;
	stroke-width: 98px;
	cursor: pointer;
	color: $demo-dark;
	
	use {
		stroke: currentcolor;
		stroke-width: 10px;
		pointer-events: none
	}
}

.guides {
	stroke: $demo-ll;
	stroke-width: 4px;
	pointer-events: none;
	
	path { opacity: 0 }
}

.points {	
	.end { cursor: pointer }
	
	.ctrl { opacity: 0 }
}

#demo .hl {
	opacity: 1;
	color: $demo-hl;
	transition: .3s
}
            
          
!
            
              const _SVG = document.getElementById('demo'), 
			D = .5*_SVG.getAttribute('viewBox').split(' ')[2], 
			NS_URI = 'http://www.w3.org/2000/svg', 
			XLink_NS = 'http://www.w3.org/1999/xlink', 
			S = [], N = 2, 
			P = 5, NCUB = 3, NT = P*NCUB, 
			PR = (.02*D), PR1 = .5*PR, 
			ACT = ['add', 'remove'], 
			BBOX = [];

let hl = null;

function getStarCoord(f = .32) {
	const RCO = f*D /* outer (pentagram) circumradius*/, 
				BAS = 2*(2*Math.PI/P) /* base angle for star poly */, 
				BAC = 2*Math.PI/P /* base angle for convex poly */, 
				RI = RCO*Math.cos(.5*BAS) /*pentagram/ inner pentagon inradius */, 
				RCI = RI/Math.cos(.5*BAC) /* inner pentagon circumradius */, 
				ND = 2*P /* total number of distinct points we need to get */, 
				BAD = 2*Math.PI/ND /* base angle for point distribution */, 
				PTS = [] /* array we fill with point coordinates */;

	for(let i = 0; i < ND; i++) {
		let /* radius at end point (inner)/ control point (outer) */
				cr = i%2 ? RCI : RCO, 
				/* angle of radial segment from origin to current point */
				ca = i*BAD + .5*Math.PI, 
				x = Math.round(cr*Math.cos(ca)), 
				y = Math.round(cr*Math.sin(ca));

		PTS.push([x, y]);
		/* for even indices double it, control points coincide here */
		if(!(i%2)) PTS.push([x, y]);
	}

	return PTS
};

function getHeartCoord(f = .16) {
	const R = f*D /* helper circle radius  */, 
				RC = Math.round(R/Math.SQRT2) /* circumradius of square of edge R */, 
				XT = 0, YT = -RC /* coords of point T */, 
				XA = 2*RC, YA = -RC /* coords of A points (x in abs value) */, 
				XB = 2*RC, YB = RC /* coords of B points (x in abs value) */, 
				XC = 0, YC = 3*RC /* coords of point C */, 
				XD = RC, YD = -2*RC /* coords of D points (x in abs value) */, 
				XE = 3*RC, YE = 0 /* coords of E points (x in abs value) */, 
				/* const for cubic curve approx of quarter circle */
				C = .551915, 
        CC = 1 - C, 
        /* coords of ctrl points on TD segs */
				XTD = Math.round(CC*XT + C*XD), YTD = Math.round(CC*YT + C*YD), 
        /* coords of ctrl points on AD segs */
				XAD = Math.round(CC*XA + C*XD), YAD = Math.round(CC*YA + C*YD), 
        /* coords of ctrl points on AE segs */
				XAE = Math.round(CC*XA + C*XE), YAE = Math.round(CC*YA + C*YE), 
        /* coords of ctrl points on BE segs */
				XBE = Math.round(CC*XB + C*XE), YBE = Math.round(CC*YB + C*YE);
	
	return [
		[XC, YC], [XC, YC], [-XB, YB], 
		[-XBE, YBE], [-XAE, YAE], [-XA, YA], 
		[-XAD, YAD], [-XTD, YTD], [XT, YT], 
		[XTD, YTD], [XAD, YAD], [XA, YA], 
		[XAE, YAE], [XBE, YBE], [XB, YB]
	].map(([x, y]) => [x, y - .09*R]);
};

function createShapes() {
	let f = document.createDocumentFragment();
	
	S.push(...[
		{ coord: getStarCoord() }, 
		{ coord: getHeartCoord() }
	]);
	
	for(let i = 0; i < N; i++) {
		let _curves, _guides, _points, _labels;
		
		S[i].g = document.createElementNS(NS_URI, 'g');
		S[i].g.classList.add('shape');
		
		_curves = document.createElementNS(NS_URI, 'g');
		_curves.classList.add('curves');
		S[i].c = [];
		
		_guides = document.createElementNS(NS_URI, 'g');
		_guides.classList.add('guides');
		
		_points = document.createElementNS(NS_URI, 'g');
		_points.classList.add('points');
		
		_labels = document.createElementNS(NS_URI, 'g');
		_labels.classList.add('labels');
				
		for(let j = 0; j < P; j++) {
			let sidx = j*NCUB, 
					tmp = S[i].coord.slice(sidx, sidx + NCUB), 
					unique = (tmp[0][0] == tmp[1][0] && tmp[0][1] == tmp[1][1]) ? 
										tmp.slice(1) : tmp;
			
			S[i].c.push({
				curve: document.createElementNS(NS_URI, 'path'), 
				ccopy: document.createElementNS(NS_URI, 'use'), 
				guide: document.createElementNS(NS_URI, 'path'), 
				ends: [
					j ? S[i].c[j - 1].ends[1] : null, 
					document.createElementNS(NS_URI, 'circle')
				],
				ctrl: unique.slice(0, unique.length - 1)
										.map(_ => document.createElementNS(NS_URI, 'circle')),
				text: document.createElementNS(NS_URI, 'text')
			});
			
			S[i].c[j].curve.id = `curve-${i}-${j}`;
			S[i].c[j].curve.setAttribute(...[
				'd',
				`M${S[i].coord[(sidx + NT - 1)%NT]}
				 C${tmp}`
			]);	
			S[i].c[j].ccopy.setAttributeNS(...[
				XLink_NS, 
				'xlink:href', 
				`#${S[i].c[j].curve.id}`
			]);
			_curves.appendChild(S[i].c[j].curve);
			_curves.appendChild(S[i].c[j].ccopy);
			
			S[i].c[j].guide.setAttribute(...[
				'd',
				`M${S[i].coord[(sidx + NT - 1)%NT]}
				  ${unique}`
			]);
			_guides.appendChild(S[i].c[j].guide);
			
			S[i].c[j].ctrl.forEach((c, k) => {
				c.classList.add('ctrl');
				c.setAttribute('r', PR1);
				c.setAttribute('cx', S[i].coord[sidx + k][0]);
				c.setAttribute('cy', S[i].coord[sidx + k][1]);
				_points.appendChild(c);
			});
			
			S[i].c[j].ends[1].id = `point-${i}-${(j + 1)%P}`
			S[i].c[j].ends[1].classList.add('end');
			S[i].c[j].ends[1].setAttribute('r', PR);
			S[i].c[j].ends[1].setAttribute('cx', S[i].coord[sidx + NCUB - 1][0]);
			S[i].c[j].ends[1].setAttribute('cy', S[i].coord[sidx + NCUB - 1][1]);
			_points.appendChild(S[i].c[j].ends[1]);
			
			S[i].c[j].text.textContent = j;
			if(S[i].c[j].ctrl.length === 1) {
				S[i].c[j].text.setAttribute(...[
					'x', 
					1.125*S[i].coord[sidx][0] - .5*BBOX[j][0]
				]);
				S[i].c[j].text.setAttribute(...[
					'y', 
					1.125*S[i].coord[sidx][1] + .5*BBOX[j][0]
				]);
			}
			else {
				if(S[i].coord[sidx][0] === S[i].coord[sidx + 1][0]) {
					S[i].c[j].text.setAttribute(...[
						'x', 
						1.15*S[i].coord[sidx][0] - .5*BBOX[j][0]
					]);
				}
				else {
					S[i].c[j].text.setAttribute(...[
						'x', 
						.5*(S[i].coord[sidx][0] + S[i].coord[sidx + 1][0]) - .5*BBOX[j][0]
					]);
					S[i].c[j].text.setAttribute(...[
						'y', 
						1.25*S[i].coord[sidx][1] + .5*BBOX[j][0]
					]);
				}
			}
			_labels.appendChild(S[i].c[j].text)
		}
		
		S[i].c[0].ends[0] = S[i].c[P - 1].ends[1];
		
		S[i].g.appendChild(_curves);
		S[i].g.appendChild(_guides);
		S[i].g.appendChild(_points);
		S[i].g.appendChild(_labels);
		f.appendChild(S[i].g)
	}
	
	S[1].g.setAttribute('transform', `translate(${D} 0)`)
	
	_SVG.appendChild(f)
};

function textSize() {
	const _TT = document.createElementNS(NS_URI, 'text');

	_SVG.appendChild(_TT);

	for(let j = 0; j < P; j++) {
		_TT.textContent = j;
		
		let bb = _TT.getBBox();
		
		BBOX.push([Math.round(bb.width), Math.round(bb.height)]);
	}

	_SVG.removeChild(_TT);
};

function highlight(hl_obj, add = 1) {
	const CURR_ACT = ACT[.5*(1 - add)];
	
	for(let i = 0; i < N; i++) {
		if(hl_obj.typ === 'curve') {			
			S[i].c[hl_obj.idx].ccopy.classList[CURR_ACT]('hl');
			S[i].c[hl_obj.idx].guide.classList[CURR_ACT]('hl');
			S[i].c[hl_obj.idx].text.classList[CURR_ACT]('hl');
			S[i].c[hl_obj.idx].ctrl.forEach(c => c.classList[CURR_ACT]('hl'));
			S[i].c[hl_obj.idx].ends[1].classList[CURR_ACT]('hl');
		}
	}
	
	hl = add > 0 ? hl_obj : null;
};

(function init() {
	textSize();
	
	createShapes();
	
	addEventListener('click', e => {
		const _T = e.target;
		
		if(hl) highlight(hl, -1);
		
		if(_T.id && /(point)|(curve)/.test(_T.id)) {
			const DATA = _T.id.split('-');
			
			highlight({typ: DATA[0], idx: +DATA[2]});
		}
	}, false);
})();
            
          
!
999px
Loading ..................

Console