| This class represents a simple picture. You can draw the picture using
| the draw method. But wait, there's more: being an electronic picture, it
| can be changed. You can set it to black-and-white display and back to
| colors (only after it's been drawn, of course).
|
| This class was written as an early example for teaching Java with BlueJ.
|
| @author  Michael Kölling and David J. Barnes
| @version 1.1  (24 May 2001)
|
public class Picture
{    
private Square wall;
    private Square window;
    private Triangle roof;
    private Circle sun;

    


| Constructor for objects of class Picture
|
public Picture()
    {
        
    }

    


| Draw this picture.
|
public void draw()
    {
        wall = new Square();
        wall.moveVertical(80);
        wall.changeSize(100);
        wall.makeVisible();

        window = new Square();
        window.changeColor("black");
        window.moveHorizontal(20);
        window.moveVertical(100);
        window.makeVisible();

        roof = new Triangle();
        roof.changeSize(50, 140);
        roof.moveHorizontal(60);
        roof.moveVertical(70);
        roof.makeVisible();

        sun = new Circle();
        sun.changeColor("yellow");
        sun.moveHorizontal(180);
        sun.moveVertical(-10);
        sun.changeSize(60);
        sun.makeVisible();
    }

    


| Change this picture to black/white display
|
public void setBlackAndWhite()
    {
        if(wall != null)   
        {
            wall.changeColor("black");
            window.changeColor("white");
            roof.changeColor("black");
            sun.changeColor("black");
        }
    }

    


| Change this picture to use color display
|
public void setColor()
    {
        if(wall != null)   
        {
            wall.changeColor("red");
            window.changeColor("black");
            roof.changeColor("green");
            sun.changeColor("yellow");
        }
    } 
}