import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 

public class misunderstood extends BApplet {
Circle circles[] = new Circle[20];

void setup()
{
  size(500,500);
  strokeWidth(3);
  framerate(50);
  colorMode(HSB,100);
  background(96);
  initCircles();
  
}

void initCircles()
{
  for (int i = 0; i < circles.length; i++)
  {
    circles[i] = new Circle();
  }
}


void loop()
{
  for (int i = 0; i < circles.length; i++)
  {
    circles[i].draw();
  }
}

void kickBalls()
{
  for (int i = 0; i < circles.length; i++)
  {
    circles[i].kick();
  }
  
}


class Circle
{
  private float myX;
  private float myY;
  private float myRadius;
  private float xVel;
  private float yVel;
  private float myHue;
  private float mySaturation;
  
  public Circle()
  {
    myX = random(width);
    myY = random(height);
    myRadius = random(30) + 30;
    xVel = random(10) - 5;
    yVel = random(10) - 5;
    myHue = 30 + random(10);
    mySaturation = 5;
  }
  
  void draw()
  {
    push();
      move();
      //checkForCollision();
      if (mousePressed)
      {
        strokeWidth(2);
        stroke(90);
        float offset = myRadius/2;
        line(mouseX,mouseY,myX +offset,myY + offset);
        strokeWidth(3);
      }
      translate(myX, myY);
      doFill();
      ellipse(0,0,myRadius, myRadius);
    pop();
    if (mousePressed)
    {
      kickBalls();
    }
  }
  
  void doFill()
  {
    float distanceFactor = 3 * (abs(xVel) + abs(yVel));
    float h = myHue + distanceFactor;
    float sat = mySaturation + distanceFactor;
    stroke(h, sat, 90);
  }
  
  void move()
  {
    myX += xVel;
    myY += yVel;
    xVel = xVel / 1.02f;
    yVel = yVel / 1.02f;
    
  }
  
  void kick()
  {
    float xDist = abs(myX - mouseX);
    float yDist = abs(myY - mouseY);
    float dist = sqrt((xDist * xDist) + (yDist * yDist));
    
    float force = 2/dist;
    float xForce = force * (xDist / (xDist+ yDist));
    float yForce = force * (yDist / (xDist+ yDist));
    
    
    if (mouseX < myX)
    {
      xForce = -xForce;
    }
    
    if (mouseY < myY)
    {
      yForce = -yForce;
    }

    xVel += xForce;
    yVel += yForce;
    
  }
  
  void checkForCollision()
  {
    if (myX < 0 || myX > width)
    {
      xVel = -xVel;
      myX += xVel;
    }
    if (myY < 0 || myY > height)
    {
      yVel = -yVel;
      myY += yVel;
    }
    
  }
}

}