Drawing clock face

Simple drawing with SVG

You can create simple clock face figure with scalar vector graphic (SVG).

• Since it is natural to use polar coordinates for circular figure like this, the idea is to just draw the circle around the origin, then translate to visible SVG user space.

<svg viewBox="-100 -100 200 200" 
       xmlns="http://www.w3.org/2000/svg">
<circle r="100" stroke="black" fill="none"/>
</svg>

• To draw ticks, use stroke-dasharray attribute noting that, with r="57.3", the circumference length of the circle becomes 360, thus one stroke every six makes the complete 60 minute marks.

<svg viewBox="-100 -100 200 200" 
       stroke="black" fill="none"
       xmlns="http://www.w3.org/2000/svg">
<circle r="57.3" stroke-dasharray="1 5" transform="rotate(-0.5) scale(1.07)"/>
</svg>

Note rotate(-0.5) correct for stroke-dasharray offset. Human eyes are keen enough to notice this 1/720 turn skew! scale(1.07) optionally makes the circle radius 60 for a nice round number to work with.

• You can avoid the offset with a trick like this

<circle r="57.3" stroke-dasharray="0.5 29 0.5 0" stroke-width="8"/>

If you do this last trick on this Wikisite, PNG replacement images generated from the SVG fail to reproduce the detail and does not look right, though as an SVG image, it's fine