Circle progress - draw a small arc at the end of the circle tip + more

Question

How to draw a small circle at the end of the stroke tip by adding a small text block below / above?

Img example:

<div class="radial-progress" data-progress="0">
    <div class="circle">
    <div class="img"></div>
        <div class="mask full">
            <div class="fill"></div>
        </div>
        <div class="mask half">
            <div class="fill"></div>
            <div class="fill fix"></div>
        </div>
        <div class="shadow"></div>
    </div>
    <div class="inset">
        <div class="percentage">
            <div class="numbers"><span>-</span><span>0%</span><span>1%</span> <!--- lots of spans --->
        </div>
    </div>
</div>

Thanks to an article by Andre medium.com, I already edited its version a bit - the updated version illustrates what I want to achieve dynamically for a given% value: http://codepen.io/Inlesco/pen/pgKXeG

However, compiled CSS is too much. For every% of 100, there will be too much CSS to position things. Current CSS (@codepen example) already weighs ~ 50KB. Not the best practice.

I already made some progress in the JS Canvas-based version of this by positioning vert & horz, centered img over the canvas. But is this really the only way and best practice for a beautiful responsive website?

Answer 1

CSS , . , - SVG. SVG , / .

, :

• ( 0 100), , . ( * 360/100), 360 .
• SVG- 3- , 90 . , -90 270 .
• - ( * PI/180).

• , , :

  • X- = Cos ( ) * + X .
  • Y = Sin ( ) * + Y .

• , , , , , , . , ( ).

• , , , a > 180 . 12 6, . , if/else.

/ , :

• SVG marker, circle. circle 3 - cx, cy - , r - .
• marker-end, path. , . , SVG .

text, x y. ( - .)

Demo:

​​ .

window.onload = function() {
  var btn = document.querySelector('button'),
    inp = document.querySelector('#progress'),
    path = document.querySelector('#p'),
    text = document.querySelector('#val'),
    rect = document.querySelector('rect'),
    output = document.querySelector('#path-output');
  var x = 0,
    y = 0,
    r = 30,
    cx = 50,
    cy = 50,
    d = '',
    fill = 'yellowgreen',
    stroke = 'transparent';
  btn.addEventListener('click', function() {
    progress = (inp.value == '') ? 0 : inp.value;
    arcRad = ((progress * 360 / 100) - 90) * Math.PI / 180;

    x = Math.cos(arcRad) * r + cx;
    y = Math.sin(arcRad) * r + cy;

    if (progress > 0 && progress <= 50) {
      d = 'M' + x + ',' + y + ' L' + cx + ',' + cy + ' L' + cx + ',' + (cy - r) + ' A' + r + ',' + r + ' 0 0,1' + x + ',' + y;
      setColors(fill, stroke);
      setOutput();
    } else if (progress > 50 && progress <= 100) {
      d = 'M' + x + ',' + y + ' L' + cx + ',' + cy + ' L' + cx + ',' + (cy - r) + ' A' + r + ',' + r + ' 0 0,1' + cx + ',' + (cy + r) + ' A' + r + ',' + r + ' 0 0,1' + x + ',' + y;
      setColors(fill, stroke);
      setOutput();
    } else {
      text.innerHTML = '';
      path.setAttribute('d', '');
      output.innerHTML = 'Enter a value between 0 and 100';
      setColors('transparent', 'transparent');
    }

    if (progress > 0 && progress <= 10) {
      rect.setAttribute('x', x);
      rect.setAttribute('y', y + 7.5);
      text.setAttribute('x', x + 2);
      text.setAttribute('y', y + 15);
    } else if (progress > 10 && progress <= 62) {
      rect.setAttribute('x', x - 5);
      rect.setAttribute('y', y + 7.5);
      text.setAttribute('x', x - 3.5);
      text.setAttribute('y', y + 15);
    } else if (progress > 62 && progress <= 100) {
      rect.setAttribute('x', x - 5);
      rect.setAttribute('y', y - 15);
      text.setAttribute('x', x - 3.5);
      text.setAttribute('y', y - 7.5);
    }

  });

  function setColors(fill, stroke) {
    rect.setAttribute('fill', fill);
    rect.setAttribute('stroke', stroke);
    path.setAttribute('fill', fill);
    path.setAttribute('stroke', stroke);
  }

  function setOutput() {
    path.setAttribute('d', d);
    text.innerHTML = progress;
    output.innerHTML = 'Angle in Radians: ' + arcRad + '<br/>';
    output.innerHTML += 'Point in Circle: ' + x + ',' + y + '<br/>';
    output.innerHTML += 'Path d attribute: ' + d;
  }
}

svg {
  width: 200px;
  height: 200px;
}
.output {
  min-height: 20px;
}
h4 {
  border-bottom: 1px solid;
}

<input id='progress' type='number' />
<button>Generate</button>
<br/>
<svg viewBox='0 0 100 100'>
  <defs>
    <marker id='dot' viewBox='0 0 10 10' markerHeight='10' markerWidth='10' refX='5' refY='5'>
      <circle cx='5' cy='5' r='2' />
    </marker>
  </defs>
  <path d='' marker-end='url(#dot)' id='p' stroke='transparent' fill='transparent' />
  <rect height='10' width='10' x='10' y='10' stroke='transparent' fill='transparent' />
  <text x='10' y='10' id='val' font-family='Arial' font-size='6'></text>
</svg>
<div class='output'>
  <h4>Output:</h4>
  <output id='path-output'></output>
</div>

Hide result

:

SVG, ​​ :

SVG | | |