Sams Teach Yourself C in 21 Days

9: drawShapes();

10: add(“Center”, new MyCanvas());

11: }

12: public static void main(String args[]) {

13: DrawingTest app = new DrawingTest(“Drawing test”);

14: app.show();

15: }

16: void drawShapes () {

17: shapes[0] = new Rectangle2D.Double(12.0,12.0, 98.0, 120.0);

18: shapes[1] = new Ellipse2D.Double(150.0, 150.0,90.0,30.0);

19: shapes[2] = new RoundRectangle2D.Double(200.0, 25,

20: 235.0, 250.0, 50.0, 100.0);

21: GeneralPath path = new GeneralPath(new Line2D.Double(100.0,

22: 350.0, 150.0, 300.0));

23: path.append(new Line2D.Double(150.0, 300.0,

24: 200.0, 350.0), true);

25: path.append(new Line2D.Double(200.0, 350.0,

26: 250.0, 300.0), true);

27: path.append(new Line2D.Double(250.0, 300.0,

28: 300.0, 350.0), true);

29: shapes[3] = path;

30: }

31:

32: class MyCanvas extends Canvas {

33: public void paint(Graphics graphics) {

34: Graphics2D gr = (Graphics2D) graphics;

35: for (int i=0; i<4; i++)

36: gr.draw(shapes[i]);

37: }

38: }

39: }

See Figure B6.2.

Lines 1 and 2 import the required AWT classes. Line 4 defines the program as a

subclass of Frame, required to display a screen window. Line 5 declares an array

of type Shapethat is an AWT class for drawing shapes.

Lines 6 to 11 make up the class constructor and are executed when the program is instan-

tiated. Line 7 uses the superkeyword to pass the program title to the Framesuperclass.

Line 8 sets the window size to be 500 pixels wide and 400 pixels high. Line 9 calls the

drawShapesmethod (defined later) to create the shapes, and line 10 creates an instance

ofMyCanvas(also defined later) and adds it, centered, to the window.

752 Bonus Day 6

LISTINGB6.4 continued

OUTPUT

ANALYSIS

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