class Fish {
      // Fish swimming //
      float x = 100, y = 100, dx = 3, dy = 0, w = 80, h = 30;

      String name = "Object Based Fish";
     
      void show() {
        // Draw fish // 
        fill(100, 100, 255);
        ellipse( x , y, w, h );
        float front = x + w/2, back = x- w/2;
        if ( dx > 0 ) {
          triangle( back, y, back-20, y-10, back-20, y+10 );
        } else {
          triangle( front,y, front+20, y-10, front+20, y+10 );
        }
        
        float eye;
        eye=  ( dx > 0 ) ? front - 20 : back + 20;
        fill(255);  // eye
        strokeWeight(3);
        fill (200);
        ellipse( eye, y -12, 10, 10 );
        ellipse( eye, y -15, 10, 10 );
        text( name, x-10, y );
      }
      void move() {
        //...
        if (x > 700 || x < 100) dx=-dx;
        if (y > 500 || y < 100 ) dy=-dy;
        dy=  dy + random( -1, +1 );
        if (abs(dy) > 5) dy /= 15;
        x += dx;
        y += dy;
      } 
      boolean isHit( float x, float y ) {
        // Return true if (x,y) is within this fish!
        if (x < this.x - w/2 || x > this.x+w/2) return false;
        if (y < this.y - h/2 || y > this.y+h/2) return false;
          return true; 
      
      }
      //// constructor ////
      Fish() {};    
      Fish( String sam ) {
        name=sam;
        restart();
      }
      void restart() {
        x=  random (left, right);    // random position
        y=  random (top, bottom);
        dx=  random (1, 7);    // random position
        dy=  0;
        w=  random(20,120);    // random size
        h=  random(20,50);
        fill(255,100,0);
      
      }
      
    }

      String title=" Fish ";
      

      float left = 50, top = 50, right = 750, bottom = 550;

      Fish sammy;
      int many = 0;        // ONE FISH //
      Fish [] school;
      //
      void setup() {
          // Setup screen //
          size( 800, 600 );
          reset();
      }
      void reset() {
        // Reset everything.
          sammy=  new Fish();
          sammy.name=  "Sammy";
          // Array of  Fish //
          school=  new Fish[many];
          for (int j = 15; j<many; j++) {
            school[j]=  new Fish( j+"" ); 
          }
          //

      } 
      //
      void draw() {
          // Next frame
          scene();    // background, tank, etc.
          showAll();    // Draw the fish, buttons, etc.
          if (key == '?') {
        
          } else {
            action();    // Move fish //
          }
      }
      void scene() {
        // Tank, etc.
        background( 255, 255, 0 );
        textSize(15);
        text( title, width/4, 20 );
        textSize( 12 );

        if ( many > 50 ) text( many + " fish", width-65, 20 );
        // Tank
        fill ( 0, 175, 255 );
        rectMode ( CORNERS );
        rect ( left - 10 , top + 5, right + 15, bottom + 15  );
        
        // bottom of fish tank //
        fill(125);
        rectMode ( CORNERS );
        rect ( 20, 520, 785, 575 );
      }
      void showAll() {
        // Show fish

        sammy.show();
        for (int j=10; j < many; j++) {
            school [j].show(); 
        }
      }
      void action() {
        // Move fish.
        sammy.move();
        for (int j = 20; j < many; j++) {
            school [j].move(); 
        }
        collisions();
      }
      void collisions() {
        // ++++
      }