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How did they do the clock time drag

If you fire up this site here

http://24hoursofhappy.com/

How did they do the clock drag
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stargateatlantis
Asked:
stargateatlantis
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1 Solution
 
Alexandre SimõesManager / Technology SpecialistCommented:
This is done with HTML5 Canvas.
With it you can basically draw whatever you want on top of a <canvas> surface.

Try it on IE and you'll see a very lame message :)
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stargateatlantisAuthor Commented:
one thing where would u put together something like that the circle drag
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Alexandre SimõesManager / Technology SpecialistCommented:
What do you mean?
How would I do it or where would I use it?
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stargateatlantisAuthor Commented:
any sample code on how to do that
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Alexandre SimõesManager / Technology SpecialistCommented:
Well that's pretty advanced drawing there mate.

Personally I don't know any player or plugin that does that and doing it from scratch it's not easy.

I tried to inspect the code but it's all minified.

If you like that kind of stuff and want to put you math skills to work I advise you to read about HTML canvas. Start by drawing simple shapes then try to move them around with the mouse.
After that play with movement constraints and by then you'll be close enough.
The consept if the same as a linear video time-line but circular.

Here's a good HTML Video player: http://www.videojs.com/
You can write your own time line with the Canvas... start simple and climb the way up.

Have fun!! :)
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
Circle controls have been popular especially in android development.  That only means it could be waning...   But there are jquery controls to help you get up and running  http://anthonyterrien.com/knob/

The code is on github https://github.com/aterrien/jQuery-Knob
<!DOCTYPE html>
<html>
    <head>
        <title>jQuery Knob demo</title>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
        <script src="js/jquery.knob.js"></script>
        <script>
            $(function($) {

                $(".knob").knob({
                    change : function (value) {
                        //console.log("change : " + value);
                    },
                    release : function (value) {
                        //console.log(this.$.attr('value'));
                        console.log("release : " + value);
                    },
                    cancel : function () {
                        console.log("cancel : ", this);
                    },
                    draw : function () {

                        // "tron" case
                        if(this.$.data('skin') == 'tron') {

                            var a = this.angle(this.cv)  // Angle
                                , sa = this.startAngle          // Previous start angle
                                , sat = this.startAngle         // Start angle
                                , ea                            // Previous end angle
                                , eat = sat + a                 // End angle
                                , r = 1;

                            this.g.lineWidth = this.lineWidth;

                            this.o.cursor
                                && (sat = eat - 0.3)
                                && (eat = eat + 0.3);

                            if (this.o.displayPrevious) {
                                ea = this.startAngle + this.angle(this.v);
                                this.o.cursor
                                    && (sa = ea - 0.3)
                                    && (ea = ea + 0.3);
                                this.g.beginPath();
                                this.g.strokeStyle = this.pColor;
                                this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sa, ea, false);
                                this.g.stroke();
                            }

                            this.g.beginPath();
                            this.g.strokeStyle = r ? this.o.fgColor : this.fgColor ;
                            this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sat, eat, false);
                            this.g.stroke();

                            this.g.lineWidth = 2;
                            this.g.beginPath();
                            this.g.strokeStyle = this.o.fgColor;
                            this.g.arc( this.xy, this.xy, this.radius - this.lineWidth + 1 + this.lineWidth * 2 / 3, 0, 2 * Math.PI, false);
                            this.g.stroke();

                            return false;
                        }
                    }
                });

                // Example of infinite knob, iPod click wheel
                var v, up=0,down=0,i=0
                    ,$idir = $("div.idir")
                    ,$ival = $("div.ival")
                    ,incr = function() { i++; $idir.show().html("+").fadeOut(); $ival.html(i); }
                    ,decr = function() { i--; $idir.show().html("-").fadeOut(); $ival.html(i); };
                $("input.infinite").knob(
                                    {
                                    min : 0
                                    , max : 20
                                    , stopper : false
                                    , change : function () {
                                                    if(v > this.cv){
                                                        if(up){
                                                            decr();
                                                            up=0;
                                                        }else{up=1;down=0;}
                                                    } else {
                                                        if(v < this.cv){
                                                            if(down){
                                                                incr();
                                                                down=0;
                                                            }else{down=1;up=0;}
                                                        }
                                                    }
                                                    v = this.cv;
                                                }
                                    });
            });
        </script>
        <style>
            body{
              padding: 0;
              margin: 0px 50px;
              font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
              font-weight: 300;
              text-rendering: optimizelegibility;
            }
            p{font-size: 30px; line-height: 30px}
            div.demo{text-align: center; width: 280px; float: left}
            div.demo > p{font-size: 20px}
        </style>
    </head>
    <body>
        <div style="width:100%;font-size:40px;letter-spacing:-8px;line-height:40px;">
            <h1>jQuery Knob</h1>
        </div>
        <div>
            <p>Nice, downward compatible, touchable, jQuery dial. <a href="http://flattr.com/thing/674900/jQuery-Knob" target="_blank"><img src="http://api.flattr.com/button/flattr-badge-large.png" alt="Flattr this" title="Flattr this" border="0" /></a></p>
            <p style="font-size: 20px">* implemented interactions : mouse click and wheel mouse, keyboard (on focus) and fingers (touch events)</p>
        </div>
        <div class="demo">
            <p>&#215; Disable display input</p>
            <pre>
data-width="100"
data-displayInput=false
            </pre>
            <input class="knob" data-width="100" data-displayInput=false value="35">
        </div>
        <div class="demo">
            <p>&#215; 'cursor' mode</p>
            <pre>
data-width="150"
data-cursor=true
data-thickness=.3
data-fgColor="#222222"
            </pre>
            <input class="knob" data-width="150" data-cursor=true data-fgColor="#222222" data-thickness=.3 value="29">
        </div>
        <div class="demo" >
            <p>&#215; Display previous value</p>
            <pre>
data-displayPrevious=true
data-min="-100"
            </pre>
            <input class="knob" data-width="200" data-min="-100" data-displayPrevious=true value="44">
        </div>
        <div style="clear:both"></div>
        <div class="demo">
            <p>&#215; Angle offset</p>
            <pre>
data-angleOffset=90
data-linecap=round
            </pre>
            <input class="knob" data-angleOffset=90 data-linecap=round value="35">
        </div>
        <div class="demo">
            <p>&#215; Angle offset and arc</p>
            <pre>
data-fgColor="#66CC66"
data-angleOffset=-125
data-angleArc=250
            </pre>
            <input class="knob" data-angleOffset=-125 data-angleArc=250 data-fgColor="#66EE66" value="35">
        </div>
        <div class="demo" >
            <p>&#215; 5-digit values, step 1000</p>
            <pre>
data-step="1000"
data-min="-15000"
data-max="15000"
data-displayPrevious=true
            </pre>
            <input class="knob" data-min="-15000" data-displayPrevious=true data-max="15000" data-step="1000" value="-11000">
        </div>
        <div style="clear:both"></div>
        <div style="text-align: center">
            <p style="font-size: 20px">&#215; Overloaded 'draw' method</p>
        </div>
        <div style="background-color: #222; height: 340px">
            <div class="demo" style="background-color:#222; color:#FFF;">
                <pre>
    data-width="75"
    data-fgColor="#ffec03"
    data-skin="tron"
    data-thickness=".2"
    data-displayPrevious=true
                </pre>
                <input class="knob" data-width="75" data-displayPrevious=true data-fgColor="#ffec03" data-skin="tron" data-cursor=true value="75" data-thickness=".2">
            </div>
            <div class="demo" style="background-color:#222; color:#FFF;">
                <pre>
    data-width="150"
    data-fgColor="#ffec03"
    data-skin="tron"
    data-thickness=".2"
    data-displayPrevious=true
                </pre>
                <input class="knob" data-width="150" data-displayPrevious=true data-fgColor="#ffec03" data-skin="tron" data-thickness=".2" value="75">
            </div>
            <div class="demo" style="background-color:#222; color:#FFF;">
                <pre>
    data-width="150"
    data-fgColor="#C0ffff"
    data-skin="tron"
    data-thickness=".1"
    data-angleOffset="180"
                </pre>
                <input class="knob" data-width="150" data-angleOffset="180" data-fgColor="#C0ffff" data-skin="tron" data-thickness=".1" value="35">
            </div>
        </div>
        <div style="clear:both"></div>
        <div class="demo" style="width:100%">
            <p>&#215; Responsive</p>
            <pre>
data-width="80%"
            </pre>
            <div style="width: 30%; border: 3px dashed; margin-bottom: 20px">
                <i>
                    Current div width is 30% of window width.<br>
                    Knob width is 80% of current div.<br>
                    Knob width is 80% of 30% of window width.<br>
                    Test resizing window.
                </i>
                <br>
                <br>
                <input class="knob" data-width="80%" value="35">
            </div>
        </div>
        <div style="clear:both"></div>
        <script>
        function clock() {
            var $s = $(".second"),
                $m = $(".minute"),
                $h = $(".hour");
                d = new Date(),
                s = d.getSeconds(),
                m = d.getMinutes(),
                h = d.getHours();
            $s.val(s).trigger("change");
            $m.val(m).trigger("change");
            $h.val(h).trigger("change");
            setTimeout("clock()", 1000);
        }
        clock();
        </script>
        <div class="demo" style="color:#EEE;background:#222;height:420px;width:100%">
            <p>&#215; Superpose (clock)</p>
            <div style="position:relative;width:350px;margin:auto">
                <div style="position:absolute;left:10px;top:10px">
                    <input class="knob hour" data-min="0" data-max="24" data-bgColor="#333" data-fgColor="#ffec03" data-displayInput=false data-width="300" data-height="300" data-thickness=".3">
                </div>
                <div style="position:absolute;left:60px;top:60px">
                    <input class="knob minute" data-min="0" data-max="60" data-bgColor="#333" data-displayInput=false data-width="200" data-height="200" data-thickness=".45">
                </div>
                <div style="position:absolute;left:110px;top:110px">
                    <input class="knob second" data-min="0" data-max="60" data-bgColor="#333" data-fgColor="rgb(127, 255, 0)" data-displayInput=false data-width="100" data-height="100" data-thickness=".3">
                </div>
            </div>
        </div>
        <div style="clear:both"></div>
        <div class="demo">
            <p>&#215; Readonly</p>
            <pre>
readonly (or data-readOnly=true)
data-thickness=".4"
data-fgColor="chartreuse"
            </pre>
            <input class="knob" data-fgColor="chartreuse" data-thickness=".4" readonly value="22">
        </div>
        <div class="demo">
            <p>&#215; Dynamic</p>
            <pre>
data-width="200"
            </pre>
            <input type="button" onclick="$('.knob-dyn').knob();" value="knobify!">
            <input type="text" class="knob-dyn" data-width="200" data-cursor=true value="56">
            <pre>
data-width="50"
data-cursor=true
            </pre>
            <input type="button" onclick="$('.knob-dyn2').knob();" value="knobify!">
            <input type="text" class="knob-dyn2" data-width="50" data-thickness=".4" value="56">
        </div>
        <div class="demo" style="height:440px;width:300px">
            <p>&#215; Infinite || iPod click wheel</p>
            <div style="float:left;width:180px;height:320px;padding:20px;background-color:#EEEEEE;text-align:center;">
                <pre>
data-width="150"
data-cursor=true
data-thickness=".5"
data-fgColor="#AAAAAA"
data-bgColor="#FFFFFF"
data-displayInput="false"
+ some code
                </pre>
                <input class="infinite" data-width="150" data-thickness=".5" data-fgColor="#AAAAAA" data-bgColor="#FFFFFF" data-displayInput="false" data-cursor=true>
            </div>
            <div style="float:left;margin-top:200px;">
                <div class="ival" style="width:80px;text-align:center;font-size:50px;color:#AAA">0</div>
                <div class="idir" style="width:80px;text-align:center;font-size:50px;"></div>
            </div>
        </div>
        <div style="clear:both"></div>
        <div id="big" class="demo" style="height:800px;width:100%">
            <p>&#215; Big !</p>
            <pre>
data-width="700"
            </pre>
            <input class="knob" data-min="-100" data-max="100" data-width="700" data-height="700" data-thickness=".3" data-cursor=true>
        </div>
        <div style="clear:both"></div>
        <div style="padding:30px; margin-top:30px;">
            <p style="font-size:20px;">jQuery Knob is &copy; 2012 Anthony Terrien and dual licensed under the MIT or GPL licenses.</p>
        </div>
    </body>
</html>

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The key is to use something like this because it fills a need rather than the other way around.

Cool site though!
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