Java On The Web Session 15

Memory Upload JAVA Applets Colors Fonts Drawing Methods Posting your Applet

Applets An applet is a program that runs embedded in HTML code They must be viewed either in  Web Browser  Appletviewer

GUI Elements Applets can display GUI elements  Graphical User Interface Colors Fonts Text-Fields, Button, Labels, etc. Button

Skeleton import java.awt.*; import java.applet; public class MyApplet extends Applet { public void init( ){ } public void paint(Graphics g){ //instructions go here } }

Skeleton import java.awt.*; import java.applet; public class MyApplet extends Applet { public void init( ){ } public void paint(Graphics g){ //instructions go here }

Colors Colors are made out of 3 values Each value goes from 0 to 255  RED  GREEN  BLUE

Colors BlackColor.black0,0,0 BlueColor.blue0,0,255 CyanColor.cyan0,255,255 GrayColor.gray128,128,128 GreenColor.green0,255,0 MagentaColor.magenta255,0,255 OrangeColor.orange255,200,0 PinkColor.pink255,175,175 RedColor.red255,0,0 WhiteColor.white255,255,255 YellowColor.yellow255,255,0

Colors import java.awt.*; import java.applet; public class MyApplet extends Applet { public void init( ){ } public void paint(Graphics g){ //Your Own Color MyColor = new Color(50, 200,150); g.setColor(MyColor); } }

.setColor(Color) g.setColor(Color.yellow); g.setColor(Color.red); g.setColor(MyColor);

Fonts The constructor Font f = new Font(Type, Style, Size); import java.awt.*; import java.applet; public class MyApplet extends Applet { public void init( ){a } public void paint(Graphics g){ Font f=new Font(“Tahoma”,Font.PLAIN, 10); g.setFont(f); } }

Methods void drawLine(int x1, int y1, int x1, int y2) void drawRect(int x, int y, int w, int h) void fillRect((int x, int y, int w, int h) void drawOval(int x, int y, int w, int h) void fillOval(int x, int y, int w, int h) void drawString(String, int x, int y) void drawArc(int x, int y, int w, int h, int start angle, int arcAngle) void fillArc(int x, int y, int w, int h, int start angle, int arcAngle)

The coordinates 0,0 x y

drawLine g.drawLine(10,10,18,24);

0,0 drawRect 8 10 g.setColor(Color.green); g.drawRect(10,10,8,10);

0, fillRect g.setColor(Color.green); g.fillRect(10,10,8,10);

0, drawOval g.setColor(Color.red); g.drawOval(10,10,8,10);

0, fillOval g.setColor(Color.red); g.fillOval(10,10,8,10);

0, drawArc g.setColor(Color.blue); g.drawArc(10,10,8,10,0,45);

0, fillArc g.setColor(Color.blue); g.fillArc(10,10,8,10,0,45);

0,0 drawString g.setColor(Color.Magenta); g.setFont(“Arial”,Font.PLAIN, 30); g.drawString(“Blanca”,10,10); 10 Blanca

Posting Your Applet Write your JAVA code Compile your code Make it available

The Applet Tag <applet CODE="YourClass.class" WIDTH=www HEIGHT=hhh IGNORE=""> Substitute www and hhh for your own width and height. Substitute YourClass.class with the name of your own class. The Applet tag should be regarded as any other html tag inside your HTML page.

Time to Try it Out Applets on the Web

Drawing Applet Skeleton Drawing Methods Colors Fonts Posting Applets in the Web any questions to Memory Defragmenter

Task Manager Post the sample applet from webct on the web, in your website. Read your Visit WebCT, webct.hawaii.edu

Task Manager Post the sample applet from webct on the web, in your website. Read your Visit WebCT, webct.hawaii.edu