I've been working on a version of asteroids as a way to test out the programming language, but I've hit a bit of a snag.

Since it's important that the angle of the ship change (so that it might fire at incoming asteroids) I attempted to use the rotate function to turn the ship on a keypress. I managed to get it working to a certain degree, but translating the origin is no way to make a game with lots of moving parts.

So my question is this: Is it possible to keep the origin at a fixed location, and still have my ship rotate, while sticking to the mouse's current position?

No. I used the rotate() function. If push and pop would work, would you know how to apply that to a triangle?

Wow, thanks. That DID help. I applied my own code to it and now I have a rotating ship that moves with the mouse. It rotates on the tip of the ship, which is kinda wierd, but acceptable.

I have a question though: I wrote up a laser function, basing the starting point of the laser at the tip of ship, and using calculations to fire along the ship's trajectory.
Unfortunately...It seems to just travel from the original origin to the bottom right of the screen. What's wrong with this?

int angle = 0;
float lazcurX = mouseX;
float lazcurY = mouseY;
int i = 0;
float traj = ((180 + angle)*3.14)/180 ;
void setup(){
 size(400,400);
 smooth();
 frameRate(23);
 stroke(255);
 noFill();  
}
//This adjusts the angle of the ship
void keyPressed() {
  if (key == CODED) {
    if (keyCode == LEFT) {
     rotate(radians(angle +5));
    angle = angle +5;
    }
    if (keyCode == RIGHT) {
      rotate(radians(angle -5));
      angle = angle -5;
    }}}
 //The Laser Function
 //The general Idea here is to add the slope, generated by the angle of the ship, to fire the lazer
// Currently, the laser is firing from the origin for some reason. Im assuming this is because Im translating the origin to the mouse pos.
 void laser() {
   //while (i<80){
 stroke(222,255,90);
     line(lazcurX, lazcurY, lazcurX + traj, lazcurY + traj);
lazcurX = lazcurX + traj;
lazcurY = lazcurY + traj;
//i = i + 5;
 }
 // Fire the laser  with a mouse click  
   
void draw(){
 background(0);
noCursor();

//Draws the ship, using push and pop matrix to adjust the origin for the ship alone
noFill();
stroke(255);
 pushMatrix();  
 translate(mouseX,mouseY);
 rotate(radians(angle));
 beginShape();
 vertex(-10,-20);
 vertex(0,0);
 vertex(+10,-20);
 vertex(0,-15);
 endShape(CLOSE);
 popMatrix();

//Asteroids, Stationary for now
fill(177);
noStroke();
ellipse(30,040,20,20);
 ellipse(200,100,40,40);
 ellipse(30,200,30,30);
 ellipse(100,400,20,20);
 ellipse(150,300,20,20);
 ellipse(300,300,20,20);

}
void mousePressed() {
      laser();
    }