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JavaScript

Plot Points on Circle

var r = 80;
var a = 80;
var b = 80;

function angleToRadians(a){
    var radians = Math.PI * (a*-1 / 180);
    return radians;
}
function debug(m){
    jQuery('#msg').prepend('<p>'+m+'</p>');
}
function radiansToCartesian(rad){
    var c={};
    c.y = Math.round( b+(r * Math.cos(rad)) );
    c.x = Math.round( a+(r * Math.sin(rad)) );
    return c;
    
}
function draw(message,coords){
    var $obj = $('<div></div>')
        .css('position','absolute')
        .css('top',coords.y+'px')
        .css('left',coords.x+'px')
        .text(message)
        .appendTo('#canvas');
}
jQuery(function($){
    angles=[0,45,90,135,180,225,270,315];
    $.each(angles,function(index,angle){
        rad = angleToRadians(angle);
        coords = radiansToCartesian(rad);
        debug(angle+ '=>' +coords.x+','+coords.y);
        draw(angle,coords);
    });
    debug('done');
});
https://snippets.siftie.com/embed/3dcffdf422fee796a1f22392508f7c69/
/raw/3dcffdf422fee796a1f22392508f7c69/
3dcffdf422fee796a1f22392508f7c69
js
JavaScript
36
2019-02-19T06:38:08
True
False
False
/api/public/snipt/32520/
plot-points-on-circle
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="kd">var</span> <span class="nx">r</span> <span class="o">=</span> <span class="mi">80</span><span class="p">;</span> </span><span id="L-2"><a name="L-2"></a><span class="kd">var</span> <span class="nx">a</span> <span class="o">=</span> <span class="mi">80</span><span class="p">;</span> </span><span id="L-3"><a name="L-3"></a><span class="kd">var</span> <span class="nx">b</span> <span class="o">=</span> <span class="mi">80</span><span class="p">;</span> </span><span id="L-4"><a name="L-4"></a> </span><span id="L-5"><a name="L-5"></a><span class="kd">function</span> <span class="nx">angleToRadians</span><span class="p">(</span><span class="nx">a</span><span class="p">){</span> </span><span id="L-6"><a name="L-6"></a> <span class="kd">var</span> <span class="nx">radians</span> <span class="o">=</span> <span class="nb">Math</span><span class="p">.</span><span class="nx">PI</span> <span class="o">*</span> <span class="p">(</span><span class="nx">a</span><span class="o">*-</span><span class="mi">1</span> <span class="o">/</span> <span class="mi">180</span><span class="p">);</span> </span><span id="L-7"><a name="L-7"></a> <span class="k">return</span> <span class="nx">radians</span><span class="p">;</span> </span><span id="L-8"><a name="L-8"></a><span class="p">}</span> </span><span id="L-9"><a name="L-9"></a><span class="kd">function</span> <span class="nx">debug</span><span class="p">(</span><span class="nx">m</span><span class="p">){</span> </span><span id="L-10"><a name="L-10"></a> <span class="nx">jQuery</span><span class="p">(</span><span class="s1">&#39;#msg&#39;</span><span class="p">).</span><span class="nx">prepend</span><span class="p">(</span><span class="s1">&#39;&lt;p&gt;&#39;</span><span class="o">+</span><span class="nx">m</span><span class="o">+</span><span class="s1">&#39;&lt;/p&gt;&#39;</span><span class="p">);</span> </span><span id="L-11"><a name="L-11"></a><span class="p">}</span> </span><span id="L-12"><a name="L-12"></a><span class="kd">function</span> <span class="nx">radiansToCartesian</span><span class="p">(</span><span class="nx">rad</span><span class="p">){</span> </span><span id="L-13"><a name="L-13"></a> <span class="kd">var</span> <span class="nx">c</span><span class="o">=</span><span class="p">{};</span> </span><span id="L-14"><a name="L-14"></a> <span class="nx">c</span><span class="p">.</span><span class="nx">y</span> <span class="o">=</span> <span class="nb">Math</span><span class="p">.</span><span class="nx">round</span><span class="p">(</span> <span class="nx">b</span><span class="o">+</span><span class="p">(</span><span class="nx">r</span> <span class="o">*</span> <span class="nb">Math</span><span class="p">.</span><span class="nx">cos</span><span class="p">(</span><span class="nx">rad</span><span class="p">))</span> <span class="p">);</span> </span><span id="L-15"><a name="L-15"></a> <span class="nx">c</span><span class="p">.</span><span class="nx">x</span> <span class="o">=</span> <span class="nb">Math</span><span class="p">.</span><span class="nx">round</span><span class="p">(</span> <span class="nx">a</span><span class="o">+</span><span class="p">(</span><span class="nx">r</span> <span class="o">*</span> <span class="nb">Math</span><span class="p">.</span><span class="nx">sin</span><span class="p">(</span><span class="nx">rad</span><span class="p">))</span> <span class="p">);</span> </span><span id="L-16"><a name="L-16"></a> <span class="k">return</span> <span class="nx">c</span><span class="p">;</span> </span><span id="L-17"><a name="L-17"></a> </span><span id="L-18"><a name="L-18"></a><span class="p">}</span> </span><span id="L-19"><a name="L-19"></a><span class="kd">function</span> <span class="nx">draw</span><span class="p">(</span><span class="nx">message</span><span class="p">,</span><span class="nx">coords</span><span class="p">){</span> </span><span id="L-20"><a name="L-20"></a> <span class="kd">var</span> <span class="nx">$obj</span> <span class="o">=</span> <span class="nx">$</span><span class="p">(</span><span class="s1">&#39;&lt;div&gt;&lt;/div&gt;&#39;</span><span class="p">)</span> </span><span id="L-21"><a name="L-21"></a> <span class="p">.</span><span class="nx">css</span><span class="p">(</span><span class="s1">&#39;position&#39;</span><span class="p">,</span><span class="s1">&#39;absolute&#39;</span><span class="p">)</span> </span><span id="L-22"><a name="L-22"></a> <span class="p">.</span><span class="nx">css</span><span class="p">(</span><span class="s1">&#39;top&#39;</span><span class="p">,</span><span class="nx">coords</span><span class="p">.</span><span class="nx">y</span><span class="o">+</span><span class="s1">&#39;px&#39;</span><span class="p">)</span> </span><span id="L-23"><a name="L-23"></a> <span class="p">.</span><span class="nx">css</span><span class="p">(</span><span class="s1">&#39;left&#39;</span><span class="p">,</span><span class="nx">coords</span><span class="p">.</span><span class="nx">x</span><span class="o">+</span><span class="s1">&#39;px&#39;</span><span class="p">)</span> </span><span id="L-24"><a name="L-24"></a> <span class="p">.</span><span class="nx">text</span><span class="p">(</span><span class="nx">message</span><span class="p">)</span> </span><span id="L-25"><a name="L-25"></a> <span class="p">.</span><span class="nx">appendTo</span><span class="p">(</span><span class="s1">&#39;#canvas&#39;</span><span class="p">);</span> </span><span id="L-26"><a name="L-26"></a><span class="p">}</span> </span><span id="L-27"><a name="L-27"></a><span class="nx">jQuery</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">$</span><span class="p">){</span> </span><span id="L-28"><a name="L-28"></a> <span class="nx">angles</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">45</span><span class="p">,</span><span class="mi">90</span><span class="p">,</span><span class="mi">135</span><span class="p">,</span><span class="mi">180</span><span class="p">,</span><span class="mi">225</span><span class="p">,</span><span class="mi">270</span><span class="p">,</span><span class="mi">315</span><span class="p">];</span> </span><span id="L-29"><a name="L-29"></a> <span class="nx">$</span><span class="p">.</span><span class="nx">each</span><span class="p">(</span><span class="nx">angles</span><span class="p">,</span><span class="kd">function</span><span class="p">(</span><span class="nx">index</span><span class="p">,</span><span class="nx">angle</span><span class="p">){</span> </span><span id="L-30"><a name="L-30"></a> <span class="nx">rad</span> <span class="o">=</span> <span class="nx">angleToRadians</span><span class="p">(</span><span class="nx">angle</span><span class="p">);</span> </span><span id="L-31"><a name="L-31"></a> <span class="nx">coords</span> <span class="o">=</span> <span class="nx">radiansToCartesian</span><span class="p">(</span><span class="nx">rad</span><span class="p">);</span> </span><span id="L-32"><a name="L-32"></a> <span class="nx">debug</span><span class="p">(</span><span class="nx">angle</span><span class="o">+</span> <span class="s1">&#39;=&gt;&#39;</span> <span class="o">+</span><span class="nx">coords</span><span class="p">.</span><span class="nx">x</span><span class="o">+</span><span class="s1">&#39;,&#39;</span><span class="o">+</span><span class="nx">coords</span><span class="p">.</span><span class="nx">y</span><span class="p">);</span> </span><span id="L-33"><a name="L-33"></a> <span class="nx">draw</span><span class="p">(</span><span class="nx">angle</span><span class="p">,</span><span class="nx">coords</span><span class="p">);</span> </span><span id="L-34"><a name="L-34"></a> <span class="p">});</span> </span><span id="L-35"><a name="L-35"></a> <span class="nx">debug</span><span class="p">(</span><span class="s1">&#39;done&#39;</span><span class="p">);</span> </span><span id="L-36"><a name="L-36"></a><span class="p">});</span> </span></pre></div> </td></tr></table>
angles, circle, javascript, radians