Getting into Processing, putting together a program to draw and sketch images. I know I will have to begin deliniating some of these operations into separate methods, but for now I have a few syntax/layout problems that if answered could really help me on my way. Looking at the following code, which compiles, why are the squares not drawing? Following are two code samples. It draws if taken alone like this, and please notice that I have removed P3D capabilty:

//Let's get this started

void setup() {
 background(255);
 size(500,500);
 frameRate(10);
}

void draw() {
 
  if(keyPressed==true) {       //a drawing 'method'
   switch(key) {
   case 'a' :
     stroke(30,20,55,30);
     rect(mouseX,mouseY,30,30);
   }
 }

 println(frameCount);

}

***********************************************************
But as soon as I introduce a rotation feature, it ceases to draw. What's the deal? I have seen that strokeWeight(),and stroke() is un-available in P3D, so I'm using the beginshape() method. Where's my logical error?
***********************************************************

//Let's get this finished

float xRot = 0.0;   //storage for current rotation values
float zRot = 0.0;
float bang;         //storage for mouse velocity values
float buck;
float bizz;

void setup() {
 background(255);
 size(500,500);
 frameRate(10);
}

void draw() {
 
 bang = mouseX - pmouseX;      //calculate mouse velocity
 buck = mouseY - pmouseY;
 
  if(keyPressed==true) {       //a drawing 'method'
   switch(key) {
   case 'a' ;
     
     translate(mouseX,mouseY);
     beginShape();
     vertex(30, 20);
     vertex(85, 20);
     vertex(85, 75);
     vertex(30, 75);
     endShape();
   }
 }

if(mousePressed) {              //change rotation value
 xRot = xRot + buck;           //based on mouse velocity
 zRot = zRot + bang;
}

 rotateX(xRot);                //apply current rotations
 rotateZ(zRot);
 
 println(frameCount);
 println(xRot);
 println(zRot);

}

ImageBurn,

Here's a simple example that may help clarify some of these issues.
Code:

void setup() {
  background(255);
  size(500,500, P3D);
  fill(0, 10);
  noStroke();
}

void draw() {
  translate(mouseX, mouseY);
  rotateX(radians(frameCount));
  rotateY(radians(frameCount*2)); 
  rotateZ(radians(frameCount*1.25));
  
  if(keyPressed) {
    switch(key) {
    case 's' :
	square();
	break;
    case 'e' :
	ellipse(0, 0, 44, 44);
	break;
    case 't' :
	triangle(-27, 27, 0, -27, 27, 27);
    }
  }
} 

void square(){
  beginShape();
  vertex(-27, -27);
  vertex(27, -27);
  vertex(27, 27);
  vertex(-27, 27);
  endShape(CLOSE);
}

 

Obviously the square() function isn't really necessary [you could more simply use rect()], but I thought seeing the implemention might help.

Sorry for the case statement formatting-seems to be a YaBB thing.

The following code DOES work, but please notice it is lacking the P3D setting. Keeping the code the same as below, with the only addition of the P3D environment, causes it to cease drawing. How can I rectify this with the P3D set so I can rotate it?

void setup() {
 background(255);
 size(500,500);              //it will cease to draw if P3D
 fill(0, 10);                //is added
 noStroke();
}

void draw() {
 
 
 if(keyPressed) {
   switch(key) {
   case 's' :
square();
break;
   case 'e' :
   translate(mouseX,mouseY);
ellipse(0, 0, 44, 44);
break;
   case 't' :
   translate(mouseX,mouseY);
triangle(-27, 27, 0, -27, 27, 27);
   }
 }
}  

void square(){
 translate(mouseX,mouseY);
 beginShape();
 vertex(-27, -27);
 vertex(27, -27);
 vertex(27, 27);
 vertex(-27, 27);
 endShape(CLOSE);
}

"...move the background(255); to after size()..."

oops. Thanks JohnG, I should have caught that when I messed with the original code.

ImageBurn, does the rotation issue make more sense now? As JohnG pointed out, you just need the rotation call prior to the drawing calls. For example, in the following the 1st rect won't be rotated, but the 2nd will be.

size(400, 400);
translate(width/2, height/2);
rect(-100, -100, 200, 200);
rotate(PI/4);
rect(-70, -70, 140, 140);