Created
February 27, 2019 18:58
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Simple Knob simple SVG knob // source https://jsbin.com/nupeke
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="simple SVG knob"> | |
| <meta charset="utf-8"> | |
| <title>Simple Knob</title> | |
| <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> | |
| <script type="text/spacebars" name="main"> | |
| <svg> | |
| <defs> | |
| <filter id="f3" x="-10%" y="-5%" width="210%" height="205%"> | |
| <feoffset result="offOut" in="SourceAlpha" dx="0" dy="2" /> | |
| <fegaussianblur result="blurOut" in="offOut" stddeviation="1" /> | |
| <feblend in="SourceGraphic" in2="blurOut" mode="normal" /> | |
| </filter> | |
| <filter id="f4" x="-10%" y="-30%" width="210%" height="205%"> | |
| <feoffset result="offOut" in="SourceAlpha" dx="0" dy="-4" /> | |
| <fegaussianblur result="blurOut" in="offOut" stddeviation="1" /> | |
| <feblend in="SourceGraphic" in2="blurOut" mode="normal" /> | |
| </filter> | |
| </defs> | |
| <g class="jog" style="-webkit-transform: rotate3d(0,0,1,{{knob}}deg); transform: rotate3d(0,0,1,{{knob}}deg)"> | |
| <circle class="floor" cx="6em" cy="6em" r="5em" filter="url(#f3)"/> | |
| <circle class="handle" cx="6em" cy="3em" r="0.6em" filter="url(#f4)"/> | |
| </g> | |
| </svg> | |
| </script> | |
| <script src="http://output.jsbin.com/yeceqe.js"></script> | |
| <style id="jsbin-css"> | |
| svg { | |
| width: 80vw; | |
| height: 80vh; | |
| } | |
| svg circle { | |
| fill: white; | |
| stroke: #ccc; | |
| } | |
| svg .jog { | |
| transform-origin: 50% 50%; | |
| -webkit-transform-origin: 50% 50%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| var mstatus, setNob; | |
| this.knob = new Blaze.Var(0); | |
| mstatus = false; | |
| setNob = function(target, e) { | |
| var deg, dt, pt, rad; | |
| if (e.originalEvent.touches != null) { | |
| e = e.originalEvent.touches[0]; | |
| } | |
| pt = { | |
| x: e.clientX - target.getBBox().x / 2, | |
| y: e.clientY - target.getBBox().y / 2 | |
| }; | |
| dt = { | |
| x: pt.x - target.cx.animVal.value, | |
| y: pt.y - target.cy.animVal.value | |
| }; | |
| rad = Math.atan2(dt.y, dt.x); | |
| deg = rad * (180 / Math.PI) + 90; | |
| if (deg > 180) { | |
| deg = -360 + deg; | |
| } | |
| return knob.set((deg < -140 && -140) || (deg > 140 && 140) || deg); | |
| }; | |
| Template.main.created = function() { | |
| return knob.set(0); | |
| }; | |
| Template.main.events({ | |
| 'mousedown svg, touchstart svg': function(e) { | |
| mstatus = true; | |
| if (mstatus) { | |
| return setNob(document.querySelector('.floor'), e); | |
| } | |
| }, | |
| 'mouseup svg, touchend svg': function() { | |
| return mstatus = false; | |
| }, | |
| 'mousemove svg, touchmove svg': function(e) { | |
| if (mstatus) { | |
| setNob(document.querySelector('.floor'), e); | |
| } | |
| return e.preventDefault(); | |
| } | |
| }); | |
| Template.main.helpers({ | |
| 'knob': function() { | |
| return knob.get(); | |
| } | |
| }); | |
| </script> | |
| <script id="jsbin-source-css" type="text/css">svg { | |
| width: 80vw; | |
| height: 80vh; | |
| circle { | |
| fill: white; | |
| stroke: #ccc; | |
| } | |
| .jog { | |
| transform-origin: 50% 50%; | |
| -webkit-transform-origin: 50% 50%; | |
| } | |
| }</script> | |
| <script id="jsbin-source-javascript" type="text/javascript">@knob = new Blaze.Var(0) | |
| mstatus = false | |
| setNob = (target, e)-> | |
| e=e.originalEvent.touches[0] if e.originalEvent.touches? | |
| pt = | |
| # mobile has no offsetX | |
| x: e.clientX - target.getBBox().x/2 | |
| y: e.clientY - target.getBBox().y/2 | |
| dt = | |
| x: pt.x - target.cx.animVal.value | |
| y: pt.y - target.cy.animVal.value | |
| rad = Math.atan2 dt.y, dt.x | |
| deg = rad * (180 / Math.PI) + 90 | |
| # range -140 ~ 140 | |
| deg= -360+deg if deg > 180 | |
| knob.set (deg < -140 and -140) or (deg > 140 and 140) or deg | |
| # knob.set deg | |
| Template.main.created = -> | |
| knob.set 0 | |
| Template.main.events | |
| 'mousedown svg, touchstart svg': (e)-> | |
| mstatus = true | |
| setNob document.querySelector('.floor'), e if mstatus | |
| 'mouseup svg, touchend svg': -> | |
| mstatus = false | |
| 'mousemove svg, touchmove svg': (e)-> | |
| setNob document.querySelector('.floor'), e if mstatus | |
| e.preventDefault() # for iOS Safari | |
| Template.main.helpers | |
| 'knob': -> | |
| knob.get()</script></body> | |
| </html> |
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| svg { | |
| width: 80vw; | |
| height: 80vh; | |
| } | |
| svg circle { | |
| fill: white; | |
| stroke: #ccc; | |
| } | |
| svg .jog { | |
| transform-origin: 50% 50%; | |
| -webkit-transform-origin: 50% 50%; | |
| } |
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| var mstatus, setNob; | |
| this.knob = new Blaze.Var(0); | |
| mstatus = false; | |
| setNob = function(target, e) { | |
| var deg, dt, pt, rad; | |
| if (e.originalEvent.touches != null) { | |
| e = e.originalEvent.touches[0]; | |
| } | |
| pt = { | |
| x: e.clientX - target.getBBox().x / 2, | |
| y: e.clientY - target.getBBox().y / 2 | |
| }; | |
| dt = { | |
| x: pt.x - target.cx.animVal.value, | |
| y: pt.y - target.cy.animVal.value | |
| }; | |
| rad = Math.atan2(dt.y, dt.x); | |
| deg = rad * (180 / Math.PI) + 90; | |
| if (deg > 180) { | |
| deg = -360 + deg; | |
| } | |
| return knob.set((deg < -140 && -140) || (deg > 140 && 140) || deg); | |
| }; | |
| Template.main.created = function() { | |
| return knob.set(0); | |
| }; | |
| Template.main.events({ | |
| 'mousedown svg, touchstart svg': function(e) { | |
| mstatus = true; | |
| if (mstatus) { | |
| return setNob(document.querySelector('.floor'), e); | |
| } | |
| }, | |
| 'mouseup svg, touchend svg': function() { | |
| return mstatus = false; | |
| }, | |
| 'mousemove svg, touchmove svg': function(e) { | |
| if (mstatus) { | |
| setNob(document.querySelector('.floor'), e); | |
| } | |
| return e.preventDefault(); | |
| } | |
| }); | |
| Template.main.helpers({ | |
| 'knob': function() { | |
| return knob.get(); | |
| } | |
| }); |
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