Exercise : Stairs loop table

stairs 1

Consider the output at right. The first stair's top-left corner is at position (5, 5). The first stair is 10x10 px in size. Each stair is 10px wider than the one above it.

Fill in the table below with the coordinates and sizes of the first five stairs. Note which values change and which ones stay the same.

stair x y width height
1 
5
 
5
 
10
 
10
2 
5
 
15
 
20
 
10
3 
5
 
25
 
30
 
10
4 
5
 
35
 
40
 
10
5 
5
 
45
 
50
 
10

Exercise : Stairs practice-it

stairs 1

Write a complete Java program to draw the stairs. Copy/paste the code template below into jGRASP and fill in your own expressions or values for each stair's x, y, width, and height.

Use your table from the previous slide to help you find the correct expressions. The values that change for each stair should become expressions in terms of the loop counter variable, i. 

import java.awt.*;

public class Stairs1 {
    public static void main(String[] args) {
        DrawingPanel panel = new DrawingPanel(110, 110);
        Graphics g = panel.getGraphics();
        for (int i = 0; i < 10; i++) {
            g.drawRect(x, y, width, height);
        }
    }
}