Core Java - [Java Graphics]

♠ Posted by Unknown in Core Java at 10:57

Java Graphics [AWT Classes/methods]

Lines :

You can draw a straight line by using the following method.

            drawLine(x1, y1, x2, y2);

The components (x1, y1) and (x2, y2) are the starting and ending points of the line.

Retangles :

Java provides six methods for drawing rectangles in outline or filled with color. You can draw plain rectangles, rounded rectangles or 3D rectangles.

            drawRect(x, y, w, h);

            fillRect(x, y, w, h);

            drawRoundRect(x, y, w, h, aw, ah);

            fillRoundRect(x, y, w, h, aw, ah);

            draw3DRect(x, y, w, h, raised);

            fill3DRect(x, y, w, h, aw, raised);

The components x, y is the upper-left corner of the rectangle, and w and h are the width and height of the rectangle.

Ovals :

In Java, the oval is drawn based on its bounding rectangle, therefore give the parameters if you were to draw a rectangle.

            drawOval(x, y, w, h);

            fillOval(x, y, w, h);

The parameters x and y indicate the top-left corner of the bounding rectangle, and w and h indicate the width and height, respectively, of the bounding rectangle.

Arcs :

Like an oval, an arc is drawn based on its bounding rectangle. An arc is conceived as part of an oval.

            drawArc(x, y, w, h, angle1, angle2);

            fillArc(x, y, w, h, angle1, angle2);

The components x,y,w, and h are the same as in the drawoval() method; the parameter angel1 is the starting angle; angel2 is the spanning angle (that is, the ending angle is angle1+angle2). Angles are measured in degree and follow the usual mathematical convention.

 Polygon :

A polygon comprises a list of (x, y) coordinate pairs, in which each pair defines a vertex of the polygon and two successive pairs are the endpoints of a line that is a side of the polygon. The first and final pairs of (x, y) points are joined by a line segment that closes the polygon.

            drawPolygon(x, y, n);

            fillPolygon(x, y, n);

            int x[] = {20, 31, 42, 53, 64};

            int y[] = {30, 34, 56, 45, 25};

            g.drawPolygon(x, y, x.length);

Example:

import java.awt.*;

import java.awt.event.*;

public class GraphicalExample extends Frame implements WindowListener

{

            public GraphicalExample()

            {

                        addWindowListener(this);

            }

           

            public void paint(Graphics g)

            {

                        g.drawRect(30, 30, 100, 100);

                        g.drawRoundRect(140, 30, 100, 100, 60, 30);

                        g.setColor(Color.GRAY);

                        g.fill3DRect(30, 140, 100, 100, true);

            }

           

            public void windowClosed(WindowEvent e)

            {}

            public void windowDeiconified(WindowEvent e)

            {}

            public void windowIconified(WindowEvent e)

            {}

            public void windowActivated(WindowEvent e)

            {}

            public void windowDeactivated(WindowEvent e)

            {}

            public void windowOpened(WindowEvent e)

            {}

            public void windowClosing(WindowEvent e)

            {

                        dispose();

                        System.exit(0);

            }

           

            public static void main(String[] args)

            {

                        GraphicalExample f = new GraphicalExample();

                        f.setSize(300, 300);

                        f.setVisible(true);

            }

}