When I pressed the required key, the color changes but when I let go, the color go back to black. How do we get the color to stay? Heres my code.

 

void setup()
{
  size(400,400);
}
void draw()
{
  for(int x=40;x<200;x+=20)
  {
    //for(int j=40;j<200;j+=20)
    {
    //ellipse(x,j,5,5);
    line(x,250,150,10);
    line(x*2,250,150,10);
    //strokeWeight(2);
    line(40,250,40,400);
    line(360,250,360,400);
   
    }
    if(keyPressed)
    {
      if(key=='r')
     {
       rect(40,250,320,160);
       triangle(150,10,140,40,160,22);
       fill(255,0,0);
     }
     if(key=='b')
     {
       rect(40,250,320,160);
       triangle(150,10,140,40,160,22);
       fill(0,0,255);
     }
     if(key=='g')
     {
       rect(40,250,320,160);
       triangle(150,10,140,40,160,22);
       fill(0,255,0);
     }
    }
      
}}