This code lets you click a shape, drag it around, and click again to "drop" it.  I wanted to have the shape rotate if you clicked and held the mouse down and dragged.  I got this working with one shape but I can't figure out how to do it with two shapes because it seems like the way rotation is done effects the whole plane... what am I missing?

Current code below:

int shapeCount = 2;
shape[] shapes = new shape[shapeCount];
void setup()
{
 size(360, 360);
 //rectMode(CENTER_RADIUS);  
 framerate(30);
 shapes[0] = new shape(180,180,"square");
 shapes[1] = new shape(50,50,"triangle_small");
}

void draw()
{
 background(0);

 for(int i=0; i < shapeCount; i++)
 {
   shapes[i].update();
 }
}

void mousePressed() {
 for(int i=0; i < shapeCount; i++)
 {
   shapes[i].mousePressed();
 }
}
void mouseDragged() {
 for(int i=0; i < shapeCount; i++)
 {
   shapes[i].spin();
 }
}
void mouseReleased() {
 for(int i=0; i < shapeCount; i++)
 {
   shapes[i].mouseReleased();
 }
}

class shape {
 float bx;
 float by;
 int bs = 40;
 boolean bover = false;
 boolean locked = false;
 boolean spinning = false;
 float bdifx = 0.0;
 float bdify = 0.0;
 float angle = 0;
 int mouseHitX = 0;
 int mouseHitY = 0;
 String _shapeType = "";
 
 shape(int x, int y, String shapeType) {
   bx = x;
   by = y;
   mouseHitX = x;
   mouseHitY = y;
   _shapeType = shapeType;
 }
 
 void update() {
   // Test if the cursor is over the box
   
   if (over()) {
     // Locked = Mouse currently down  
     if(locked) {
       stroke(255);
       fill(153);
     }
   } else {
     stroke(153);
     fill(153);
   }
   // Draw the box
   if (locked) {
     mouseDragged();
   }

//uncommenting this and the "0,0" calls below
//will turn on rotation.. but it's pretty strange
   //translate(bx,by);
   //rotate(angle);  
   //rectMode(CENTER);
   
   if (_shapeType == "square")
   {
     //rect(0,0,bs,bs);
     rect(bx,by,bs,bs);
   }
   else if (_shapeType == "triangle_small")
   {
     triangle(bx,by, bx,by+bs, bx+bs,by);
     //triangle(0,0, 0,bs, bs,0);
   }
 }
 
 boolean over()
 {
   return (mouseX > bx-bs && mouseX < bx+bs &&
       mouseY > by-bs && mouseY < by+bs);
 }
 
 void mousePressed() {
   if(over()) {
     locked = !locked;
     fill(255, 255, 255);
     spinning = true;
     mouseHitX = mouseX;
     mouseHitY = mouseY;
   } else {
     locked = false;
   }
   bdifx = mouseX-bx;
   bdify = mouseY-by;
 }  

 void mouseDragged() {
   if(locked & !spinning) {
     bx = constrain(mouseX-bdifx, bs, width-bs);
     by = constrain(mouseY-bdify, bs, height-bs);
   }
 }
 
 void spin() {
   if (locked & spinning)
   {
     angle = radians(mouseX);
   }
 }

 void mouseReleased() {
    spinning = false;
    int tolerance = 2;
    if (abs(mouseX - mouseHitX) > tolerance &
        abs(mouseY - mouseHitY) > tolerance)
        {
          locked = false;
        }
 }
}

Thank you very much... exactly what I was looking for!