Introduction to Parameters and Objects - Building Java Programs: A Back to Basics Approach - page 206

A Larger Example: DrawDiamonds
Now let's consider a slightly more complicated task: drawing the largest diamond
figure that will fit into a box of a particular size. The largest diamond that can fit into
a box of size 50 × 50 is shown in Figure 3G.12.

(0, 0) (25, 0)

(0, 25) (50, 25)

(25, 50)

Figure 3G.12

Diamond

The code to draw such a diamond would be the following:
g.drawRect(0, 0, 50, 50);
g.drawLine(0, 25, 25, 0);
g.drawLine(25, 0, 50, 25);
g.drawLine(50, 25, 25, 50);
g.drawLine(25, 50, 0, 25);
Now imagine that we wish to draw three such 50 50 diamonds at different loca-

tions. We can turn our diamond-drawing code into a drawDiamond method that we'll
call three times. Since each diamond will be in a different position, we can pass the
x - and y -coordinates as parameters to our drawDiamond method.
A diamond enclosed by a box with top-left corner at the location (78, 22) is shown
in Figure 3G.13.

×

(78, 22) (103, 22)

(78, 47) (128, 47)

(103, 72)

Figure 3G.13

Diamond at (78, 22)