java on the web session 15. memory upload java applets colors fonts drawing methods posting your...
TRANSCRIPT
Java On The WebJava On The Web
Session 15
Memory UploadMemory Upload
• JAVA Applets
• Colors
• Fonts
• Drawing Methods
• Posting your Applet
AppletsApplets
• An applet is a program that runs embedded in HTML code
• They must be viewed either in Web Browser Appletviewer
GUI ElementsGUI Elements
• Applets can display GUI elements Graphical User Interface
• Colors
• Fonts
• Text-Fields, Button , Labels, etc.Button
SkeletonSkeleton
import java.awt.*;import java.applet;public class MyApplet extends Applet { public void init( ){ } public void paint(Graphics g){ //instructions go here }}
SkeletonSkeleton
import java.awt.*;import java.applet;public class MyApplet extends Applet { public void init( ){ } public void paint(Graphics g){ //instructions go here }}
ColorsColors
• Colors are made out of 3 values
• Each value goes from 0 to 255 REDRED GREENGREEN BLUEBLUE
ColorsColorsBlack Color.black 0,0,0
Blue Color.blue 0,0,255
Cyan Color.cyan 0,255,255
Gray Color.gray 128,128,128
Green Color.green 0,255,0
Magenta Color.magenta 255,0,255
Orange Color.orange 255,200,0
Pink Color.pink 255,175,175
Red Color.red 255,0,0
White Color.white 255,255,255
Yellow Color.yellow 255,255,0
ColorsColors
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).setColor(Color)
g.setColor(Color.yellow);
g.setColor(Color.red);
g.setColor(MyColor);
FontsFonts• 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); }}
MethodsMethodsvoid 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 coordinatesThe coordinates
0,0
xx
yy
0,0
drawLinedrawLine
g.drawLine(10,10,18,24);
10
10
24
18
0,0
drawRectdrawRect
810
10
10
g.setColor(Color.green); g.drawRect(10,10,8,10);
0,0
810
10
10
fillRectfillRect
g.setColor(Color.green); g.fillRect(10,10,8,10);
0,0
810
10
10
drawOvaldrawOval
g.setColor(Color.red);g.drawOval(10,10,8,10);
0,0
810
10
10
fillOvalfillOval
g.setColor(Color.red);g.fillOval(10,10,8,10);
0,0
810
10
10
drawArcdrawArc
g.setColor(Color.blue);g.drawArc(10,10,8,10,0,45);
0,0
810
10
10
fillArcfillArc
g.setColor(Color.blue);g.fillArc(10,10,8,10,0,45);
0,0
drawStringdrawString
g.setColor(Color.Magenta);g.setFont(“Arial”,Font.PLAIN, 30);g.drawString(“Blanca”,10,10);
10
10
Blanca
Posting Your AppletPosting Your Applet
• Write your JAVA code
• Compile your code
• Make it available
The Applet TagThe Applet Tag<applet
CODE="YourClass.class"WIDTH=www HEIGHT=hhhIGNORE=""></applet>
•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 OutTime to Try it Out
Appletson the
Web
• Drawing Applet Skeleton
• Drawing Methods
• Colors
• Fonts
• Posting Applets in the Web
• E-mail any questions to [email protected]
Memory DefragmenterMemory Defragmenter
Task ManagerTask Manager
• Post the sample applet from webct on the web, in your website.
• Read your e-mail
• Visit WebCT, webct.hawaii.edu
Task ManagerTask Manager
• Post the sample applet from webct on the web, in your website.
• Read your e-mail
• Visit WebCT, webct.hawaii.edu