If it helps, here is the code of my crude guitar sketch, and I want the tuners to rotate in relation to the neck on mouse click or mouse over like real tuners would on a real guitar:

/* First primative work: Accoustic Bass Guitar Shape.
Eventual Objective: Use this sketch to create an interactive bass guitar
with strings that can move/play and perhaps incorporate sound as well? -ben g */

/* Note: I used hashtags or hexes (#) with six digits for colors for
simplicity and to clean up the code. */

//background
size(1000,700);
smooth(); // anti-aliasing seemed best!
background(#9E9E9E);

//Guitar Body Parts Follow:

//"Shadow" ellipse for Bottom Cirlce of guitar.
fill(#000000);
ellipse(200,500,350,310);

//"Shadow" quad of guitar neck.
fill(#000000);
quad(450,312,485,380,925,130,885,55);
/* Typed BEFORE the "Shadow" ellipse of the smaller guitar circle 
so that it remains tucked underneath it */

//"Shadow" ellipse of small circle of guitar body.
fill(#000000);
ellipse(400,397,270,290);

// Base ellipse of Guitar.
stroke(#A7A57D);
strokeWeight(1);
fill(#D3CE6B);
ellipse(200,485,350,310);


// Smaller base ellipse of guitar body.
stroke(#E5E4C9);
strokeWeight(1);
fill(#D3CE6B);
ellipse(400,390,280,280);

/* Neck of guitar, colored. Pain in the neck to create.
Need more work w/quads. */
fill(#D3CE6B);
quad(450,312,485,370,925,125,885,55);

// Sound Hole of Guitar.
fill(#644133);
stroke(#87D3DB);
strokeWeight(1);
ellipse(320,430,170,170);


// Guitar Bridge:

// Bridge of Guitar
fill(#644133);
stroke(#87D3DB);
strokeWeight(1);
quad (160,470,190,450,260,530,220,550);

// Bottom points of strings

stroke(#FFFFFF);
strokeWeight(15);

// first bottom point
point(178,478);

// second bottom point
point(188,490);

// third bottom point
point(197,503);

// fourth bottom point
point(206,516);

//Dividing line of guitar bridge
stroke(#000000);
strokeWeight(6);
line(185,460,238,530);


// Strings:

//First String (E)
stroke(#000000);
strokeWeight(2);
line(175,480,800,110);

//Second String (A)
stroke(#000000);
strokeWeight(2);
line(188,490,880,85);

//Fourth String (G)
stroke(#000000);
strokeWeight(2);
line(206,516,835,160);

//Third String (D)
stroke(#000000);
strokeWeight(2);
line(197,503,895,110);


// Tuners and Connecting Strings

//First Tuner (E)
fill(#FFFFFF);
stroke(#000000);
strokeWeight(1);
triangle(800,112,750,80,800,50);
// 800/112 is point that meets string.


//Connecting String (From A string to A tuner)

stroke(#000000);
strokeWeight(2);
line(880,85,869,65);

//Second Tuner (A)
fill(#FFFFFF);
stroke(#000000);
strokeWeight(1);
triangle(869,65,825,40,880,12);
// 869/65 is point that meets string.


//Connecting String (From D string to D tuner)

stroke(#000000);
strokeWeight(2);
line(895,110,909,135);

//Third Tuner (A)
fill(#FFFFFF);
stroke(#000000);
strokeWeight(1);
triangle(906,130,900,190,950,163);
// 906/130 is point that meets string.

//Connecting String (From G string to G tuner)

stroke(#000000);
strokeWeight(2);
line(835,160,840,170);


//Fourth Tuner (G)
fill(#FFFFFF);
stroke(#000000);
strokeWeight(1);
triangle(840,170,835,225,890,195);
// 840/170 is point that meets string.


// End! For now.