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Topic: Phyllotaxis (Read 436 times) |
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Fractal_Mike
Guest
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Phyllotaxis
« on: Oct 3rd, 2003, 4:05pm » |
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edit: adding URL: http://stud3.tuwien.ac.at/~e0225885/programmieren2.html
This is a simple simulation of a (sun)flower head, where you should be able to change the value "del" (which denotes the difference from the Fibonacci-angle) with moving the mouse.
Unfortunately the only values I get are 0.0 and -1.0 (on the left border), and I have no clue why.
del should go smoothly from -1 to 1 if you move the mouse from left to right, as is mouseX, but it doesn't.
Please help; thank you!
Code:
void setup(){
size(300,300);
background(#FFFFD2);
ellipseMode(CENTER_DIAMETER);
smooth();
}
float del=0;
void loop(){
framerate(8);
background(#FFFFD2);
float ang=0;
fill(#8B6914);
for (int n=8; n<500; n=n+1){
ellipse(int(150+sin(ang)*0.28*n),
int(150+cos(ang)*0.28*n),5,5);
ang+=radians(137.507764+del);
}
print("del:"+del); //for testing
println(" mouseX:"+mouseX); //for testing
}
void mouseMoved(){
del=(mouseX-150)/150;
}
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| « Last Edit: Nov 8th, 2003, 10:52am by Fractal_Mike » |
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JohnG
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Re: Phyllotaxis
« Reply #1 on: Oct 3rd, 2003, 5:17pm » |
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You need to cast mouseX to a float before doing the division, or it'll do an integer division which can only have the vaules -1, 0 or 1...
so you want:
Code:
del=(int)(((float)(mouseX-150))/150.0);
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I think.
It might be better to change 150 to (width/2) in case you ever want to have a different sized verson.
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Fractal_Mike
Guest
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Re: Phyllotaxis
« Reply #2 on: Oct 4th, 2003, 3:05pm » |
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Thanks much!
I just changed it to
Code:
del=((float)(mouseX-width/2))/(width/2);
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That was enough, since del should be a float.
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