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Topic: script / eval style functionality (Read 2076 times) |
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TomC
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script / eval style functionality
« on: Mar 22nd, 2004, 1:39pm » |
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on Mar 22nd, 2004, 7:00am, lunetta wrote:Hello to all
I have a code that defines three colors:
color c1 = color (225, 15,10);
color c2 = color (35, 200, 5);
color c3 = color (35, 120, 120);
then I'm drawing some stuff; the fill of these stuff needs to be one of those 3 predefined colors, at random; or c1, or c2 or c3;
1) is it possible to do something like
String randc = "c"+int(random(3)+1);
and then use the String randc as a color fill - fill(randc); ? how?
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My personal opinion is that eval() style functions are the wrong way to do things, but since they are possible in Java I thought I would post this. It might help with quick porting of flash projects to processing
Code:
// if you want to access these by name,
// using reflection, they have to be public
public color c1, c2, c3;
void setup() {
c1 = color (225, 15,10);
c2 = color (35, 200, 5);
c3 = color (35, 120, 120);
}
void loop() {
background(0);
// choose c1, c2, or c3
String randColorName = "c"+int(random(2.9999999)+1);
// get color with given name
color randColor = colorForName(randColorName);
// apply color
fill(randColor);
rect(10,10,width-20,height-20);
}
// uses reflection API to pull out value
// of given field name... field must be public
// returns black if it fails
color colorForName(String name) {
int col = 0;
try {
col = this.getClass().getField(name).getInt(this);
}
catch(Exception e) {
e.printStackTrace();
}
return col;
}
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REAS
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Re: script / eval style functionality
« Reply #1 on: Mar 24th, 2004, 7:55pm » |
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A very easy way to solve the initial issue requested by lunetta is to make an array of colors and then access a member of this array with a random value converted to an int.
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cello
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Re: script / eval style functionality
« Reply #2 on: Sep 14th, 2004, 2:19am » |
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If you want to go all out, check out rhino for scripting java/processing.
Marcello
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| « Last Edit: Sep 14th, 2004, 2:19am by cello » |
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