Reference for Processing (BETA) version 0135+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name

HALF_PI (1.57079...)

Examples
example pic
float f = 0.0;
beginShape(POLYGON);
while(f < HALF_PI) {
  vertex(width/2 + cos(f)*40, height/2 + sin(f)*40);
  f += PI/12.0;
}
endShape();
Description HALF_PI is a mathematical constant with the value 1.57079632679489661923. It is half the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().
Syntax
HALF_PI
Parameters
Usage Web & Application
Related PI
TWO_PI
Updated on December 20, 2005 02:03:00pm PST

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