class line {
  color a;
  float xpos;
  float ypos;
  float x2pos;
  float y2pos;
  float xspeed;
 
  righteye(color tempA,float tempXpos,float tempYpos,float tempXspeed) {
    a = tempA;
    xpos = tempXpos;
    ypos = tempYpos;
    x2pos = xpos - 10;
    y2pos =ypos + 10;
    xspeed =tempXspeed;
  }
  void display() {
    stroke(0);
    fill(a);
    line(xpos,ypos,x2pos,y2pos);
  }
  void drive() {
    xpos = xpos + xspeed;
    x2pos = x2pos + xspeed;
    if (xpos>width){
      xpos =10;
      x2pos = 0;
    }
  }
}
.....
.....
line myline;
void setup() {
size (200,200);
myline = new line(color(255,0,0),10,100,1);
}
void draw() {
background(255);
myline.display();
myline.drive();
}








i'm a beginner,not good at computer.         i want to let a line horizontal move on the editor window , i tried to use the "class" to do it ,but it doesn't work....
i'm stupid, haven't any conception about it....
what's the right way?