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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE funcs
SYSTEM '../../../clonk.dtd'>
<?xml-stylesheet type="text/xsl" href="../../../clonk.xsl"?>
<funcs>
<func>
<title>PV_Random</title>
<category>Particles</category>
<version>5.3.3 OC</version>
<syntax>
<rtype>array</rtype>
<params>
<param>
<type>int</type>
<name>start_value</name>
<desc>Begin of the interval to draw the random number from.</desc>
<optional />
</param>
<param>
<type>int</type>
<name>end_value</name>
<desc>End of the interval to draw the random number from.</desc>
<optional />
</param>
<param>
<type>int</type>
<name>reroll_interval</name>
<desc>Interval in frames after which a new random number will be drawn.</desc>
<optional />
</param>
<param>
<type>int</type>
<name>seed</name>
<desc>Particle-local seed that is used for the random rool. Can be used to draw the same random number two times (see example).</desc>
<optional />
</param>
</params>
</syntax>
<desc>The value will be a random number in the interval from start_value to (not including) end_value. The values in between are not whole integers, but are also in fraction of integers. This means that PV_Random(0, 1) can not only return one value (the 0) but a lot of different values in the interval between 0 and 1.</desc>
<remark>See the <emlink href="particle/index.html">particle documentation</emlink> for further explanations of the particle system.</remark>
<examples>
<example>
<code><funclink>CreateParticle</funclink>("MagicRing", 0, 0, PV_Random(-100, 100), -20, 100, {Prototype = Particles_Glimmer(), Size = PV_Random(0, 3, 10)}, 100);</code>
<text>Creates 100 particles with a random speed in X direction and a random size (which changes every ten frames).</text>
</example>
<example>
<code>
var min_speed = 50;
var max_speed = 100;
var min_angle = 0;
var max_angle = 360;
<funclink>CreateParticle</funclink>("SphereSpark", 0, 0,
<funclink>PV_Sin</funclink>(<funclink>PV_Random</funclink>(min_angle, max_angle, 0, 1), <funclink>PV_Random</funclink>(min_speed, max_speed, 0, 2)),
<funclink>PV_Cos</funclink>(<funclink>PV_Random</funclink>(min_angle, max_angle, 0, 1), <funclink>PV_Random</funclink>(min_speed, max_speed, 0, 2)),
PV_Random(10, 200),
Particles_Glimmer(), 400);</code>
<text>Uses the particle-local seed to draw the same angle and radius for the X and Y speed of the particle. This leads to a radial distribution (instead of a square). The seed parameter is set to the same number (here 1 and 2) where the same result should be drawn.</text>
</example>
</examples>
<related>
<funclink>CreateParticle</funclink>
<funclink>PV_Linear</funclink>
<funclink>PV_Direction</funclink>
<funclink>PV_Step</funclink>
<funclink>PV_Speed</funclink>
<funclink>PV_KeyFrames</funclink>
<funclink>PV_Sin</funclink>
<funclink>PV_Cos</funclink>
<funclink>PC_Die</funclink>
<funclink>PC_Bounce</funclink>
</related>
</func>
<author>Zapper</author><date>2013-10</date>
</funcs>
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