Graphics

1.  The graphics class

The graphics class is part of the java.awt.package, so if your applet does any painting (as it usually will), make sure you import that class at the beginning of your java file:-

Import java.awt Graphics;

Public class Myclass extends java.applet.Applet

{

Public.void paint (Graphics g)

}

Drawing and filling:- the graphics class provide a set of simple built in graphics primitives for drawing including lines, rectangles, polygons, ovals and arcs.

                             LINES

To draw a straight lines, use the

Drawline () method, it takes four arguments: the x and y coordinates of stating and x and y coordinates of ending

Import java.awt.Graphics;

Public class Mylines extends java.applet.Applet

{

Public void paint (Graphics g)

}

g.draw line (23,23,75,75);

                            

                             RECTANGLES

The java graphics primitives provides not just one, but tree kinds of rectangles.

·       Plain rectangles

·       Rounded rectangles, which are rectangle with rounded corners

·       Three – dimensional rectangle, which are drawn with a shaded border.

  For each of these rectangles, you have two methods to choose from, one that draws the rectangle in outline form and one that draws the rectangle filled with color.

To draw a plain rectangle, use either draw Rect() or fill Rect() methods. Both take four arguments the x and y coordinates of the top-left corner of the rectangle and te width and height of the rectangle to draw

Import java.awt. Graphics;

Public class Myrect extends java.applet.Applet

{

Public void paint (Graphics g)

{

g.draw Rect (20,20,60,60);

g.fill Rect (120,20,60,60);

}

Rounded rectangles are as you might expect, rectangles with rounded corners. Te draw Round Rect () and fill Round Rect ()

To draw rounded rectangles are similar to regular rectangles except that rounded rectangles have two extra arguments for width and height of the angle of the corners

g.draw Round Rect (20,20,60,60,10,10)

g.fill Round Rect (120,20,60,60,10,10)

finally, there are three dimensional rectangles. These rectangles aren’t finally 3D; instead they have a slight shadow effect the make them after

g.draw 3D Rect (20,20,60,60,true raise);

g.draw 3D Rect (20,20,60,60, false intented);

                                      POLYGONS

Polygons are shapes with an unlimited number of sides. To draw a polygon, you need a set of x and y coordinates. The polygon is then drawn as a set of straight lines from the first paint to the second, the second to the third and so on.

As with rectangle, you can draw an outline or a filled polygon using draw Polygon() and Fill polygon

Using first way, three argument

·       An array of integer representing x cords

·       An array of integer representing y cords

·       An integer representing total number of points

{

x                           -        int eyes  = {39,94,97,142,53,58,26};

y                           -        int whys = {33,74,36,70,108,80,106};

total points         -        int pts = eyes.length

                                      g.draw Polygon (exes,whyes,pts);

}

Polygon object

Polygon poly object=new Polygon()

g.fill Polygon Poly object

                                      OVALS

You use ovals to draw ellipses or cicles. Ovals are just like rectangle with overly rounded corners. You draw them using four arguments. The x and y of the top corner and the width and height of the oval itself. Note that because you’re drawing an oval, the starting point is some distance to the left and up from the actual.

The draw Oval () fill Oval ()

{

g.draw Oval (20,20,60,60);

g.fill Oval (120,20,100,60);

}

                             ARCS

X and y coordinates, width and height total four argumens and 2 are the degrees.

Counter clockwise

Draw Arc () fill Arc ()

{

g.draw Arc (20,20,60,60,90,180);

g.fill Arc (120,20,60,60,90,180);

}