Rotating shapes

rotate-shapes-example.pde

void setup()
{
    size(500,500);
    strokeWeight(2);
}

void draw()
{  background(128);
   rotateRect(width/2,height/2,100,100,frameCount%360);
   
   rotateRect(100,400,50,100,frameCount%360);
   
   
   rotateLine(300,100,100,frameCount%360);
   
   rotateEllipse(100,100,100,50,frameCount%360);
}

void rotateRect(float x, float y, float w, float h, float angle) {
  
  // center anchorpoint
  // can be done easier with rectMode(CENTER), however this is more flexible for other configurations
  float ax = -(w/2);
  float ay = -(h/2);
  
  pushMatrix();
    translate(x,y);
    rotate(radians(angle));
    rect(ax,ay,w,h); 
  popMatrix();
  
  // draw Anchor
  fill(0);
  ellipse(x,y,5,5);
  noFill();
}


void rotateLine(float x, float y, float l, float angle) {
  
  // center anchorpoint
  float ax = -(l/2);
  
  pushMatrix();
    translate(x,y);
    rotate(radians(angle));
    
    line(ax, 0, ax+l, 0);
    
    //rect(ax,ay,w,h); 
  popMatrix();
  
  // draw Anchor
  fill(0);
  ellipse(x,y,5,5);
  noFill();
}


void rotateEllipse(float x, float y, float w, float h, float angle) {
  
  pushMatrix();
    translate(x,y);
    rotate(radians(angle));
    ellipse(0,0,w,h); 
  popMatrix();
  
  // draw Anchor
  fill(0);
  ellipse(x,y,5,5);
  noFill();
}