Re : Scaling text

The alignment is working, but some fonts won't say how many pixels they increase in size correctly, so the alignment is not adjusting properly. You can get the textAscent, apply a calc on it, then use this as the start position for your Y. Also note this behaviour changes if you use P2D, P3D or OPENGL.

textAscent(). http://processing.org/reference/textAscent_.html

Here is my suggestion to start fixing this:

1. void draw(){
2.   calculateFFT();
3.  
4.   background(0);
5.  
6.   smooth(8);
7.   textFont(Header, Channel[4]);
8.  
9.   fill(255);
10.   textAlign(CENTER,CENTER);
11.   float yStartPos = calculateAscent(Channel[4]);
12.   text("H", (width/2), yStartPos);
13. }
14. 
    
15. float calculateAscent(float value) {
16.   float base = height / 2;
17.   float scalar = 0.1; // Different for each font, change this until you get the result you want
    
18.  
19.   float a = textAscent() * scalar;  // Calc ascent
20.   stroke(100); // for the reference line
    
21.   line(0,base-a,width,base-a); // ref purposes
22.   return base-a;
23. }