processing-docs/content/api_en/HALF_PI.xml at macos · processing/processing-docs

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<name>HALF_PI (1.57079...)</name>
<category>Constants</category>
<subcategory></subcategory>
<type></type>
<image>HALF_PI.png</image>
<code><![CDATA[
float x = width/2;
float y = height/2;
float d = width * 0.8;
arc(x, y, d, d, 0, QUARTER_PI);
arc(x, y, d-20, d-20, 0, HALF_PI);
arc(x, y, d-40, d-40, 0, PI);
arc(x, y, d-60, d-60, 0, TWO_PI);
<description><![CDATA[
<b>HALF_PI</b> is a mathematical constant with the value 1.5707964. It is half the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions <b>sin()</b> and <b>cos()</b>. 
]]></description>

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