Description of a flower:


(1) a flower has:


  - color      (a string)
  - position   (two numbers)
  - spin angle (a number)


(2) a flower can be created:

  - by giving value for its color
    the other properties set to 
    random values




(3) a flower can do:


  //
  // - tell us its color, 
  //   position, etc.
  //   (omitted from example)
  //


  - private method to help the flower
    pick random initial angle

    illustrates the use of switch
    emphasizes methods can be private



    the rule for picking the color is made up:
    * get a random value and assign:
      - 30 degrees if value is 1, 2, or 3
      - 60 degrees if value is 4
      - 90 degrees if value is 5 or 6
      - 0 degrees for any other value
















  - update its X, Y position









  - rotate itself by a fixed
    angle of 30 degrees




  - draw itself based on
    its location, color
    and angle of spin

package cs1.ParkApp;

import cs1.app.*;

public class Flower
{
    // data members: the "features/characteristics" of Flower
    //               typically private
    
    private String color;
    private double curX;
    private double curY;
    private int curAngle;
    
    // constructor(s): same name as class, no return type
    
    public Flower( String initColor )
    {
        color = initColor;
        curX = canvas.getRandomInt( 0, canvas.getWidth() );
        curY = canvas.getRandomInt( 4.0/5.0*canvas.getHeight(), canvas.getHeight() );
        curAngle = pickAngle( );
    }
    
    // methods: the "actions/behaviors" of Flower
    //          typically public        

    //
    // could put methods/behaviors
    //     getColor(), getX(), getY()
    // omitted from this example
    //
    
    private int pickAngle( )
    {
        int randomNumber = canvas.getRandomInt( 1, 6 );

        int angle = 0;

        switch( randomNumber )
        {
            case 1:    // if randomNumber is 1, 2, or 3
            case 2:    
            case 3:
                angle = 30;    // we want the angle to be 30 degrees
                break;

            case 4:    // if randomNumber is 4
                angle = 60;    // we want the angle to be 60 degrees
                break;

            case 5:    // if randomNumber is 5 or 6
            case 6:
                angle = 90;    // we want the angle to be 90 degrees
                break;

            default:   // if randomNumber is anything else
                angle = 0;     // we want the angle to be 0 degrees
                break;
        }

        return angle;
    }

    public void setX( double newX )
    {
        curX = newX;                            // change the X position
    }

    public void setY( double newY )
    {
        curY = newY;                            // change the Y position
    }

    public void spin( )
    {
        curAngle = ( curAngle + 30 ) % 360;     // increase angle by 30 degrees
                                                // (use % as alternative to if)
    }
    
    public void draw( )
    {
        String filename = "flower" + curAngle + ".png"
        canvas.drawImage( curX, curY, fileName );

        canvas.drawCircle( curX, curY, 5, color );
    }
}