Reference for Processing version 1.2. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.

Name

QUARTER_PI (0.78539...)

Examples
float angle = 0.0; 
beginShape(POLYGON); 
vertex(width/2, height/2);
while(angle  QUARTER_PI) { 
  vertex(width/2 + cos(angle)*40, height/2 + sin(angle)*40); 
  angle += PI/12.0; 
} 
endShape(CLOSE);
Description QUARTER_PI is a mathematical constant with the value 0.7853982. It is one quarter the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().
Usage Web & Application
Related PI
TWO_PI
HALF_PI
Updated on June 14, 2010 12:05:29pm EDT

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