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Index › Programming Questions & Help › Syntax Questions › mouse sensitive wave
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mouse sensitive wave (Read 375 times)
Gerd
mouse sensitive wave
Dec 22nd, 2007, 6:20pm  
Hey there,
i'm bloody new to processing (or programming in general...) ... so i'd be deeply grateful for every hint & kind of help.
My problem is the following: There is a damn high number of little dots i have to animate (depending on mouse movement...), the following excerpt describes every dots y-position. Is there something to get all these lines into one?(i.e. some kind of function describing the first4 lines) (Sorry for asking dumb questions....)

void draw() {
 background(0);
 
 posY1 = posY1 + (mouseY/3-posY1)*speed;
 posY2 = posY2 + (posY1-posY2)*speed;
 posY3 = posY3 + (posY2-posY3)*speed;
 posY4 = posY4 + (posY3-posY4)*speed;

(...) up to posY25 ...

   ellipse(20, posY1, 1, 1);
   ellipse(30, posY2, 1, 1);
   ellipse(40, posY3, 1, 1);
   ellipse(50, posY4, 1, 1);

(...) up to ellipse 25 ...

Thanks for your answers.
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« Last Edit: Dec 22nd, 2007, 7:53pm by Gerd »  
 
antiplastik
Re: mouse sensitive wave
Reply #1 - Dec 22nd, 2007, 7:56pm  
hi, here are some tips :

- instead of using 25 different variables, you should use arrays :
http://processing.org/reference/Array.html

- instead of repeating the same instruction over and over, use for loops :
http://processing.org/reference/for.html

- finally, instead of writing a = a + x, you can write a += x;

try this :

Code:
float pos[] = new float[25];
pos[0] += (mouseY/3 - pos[0])*speed;
for (int i = 1; i <= 25; i++) {
  pos[i] += (pos[i-1] - pos[i])*speed;
}

for (int i = 1; i <= 25; i++) {
  ellipse(10 + 10*i, pos[i], 1, 1);
}
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