Bai5 Applet

8/3/2019 Bai5 Applet

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GING VIN:

BI TIN TRNG

NHP MN JAVA

BI 5APPLET

TRNG CAO NG CNG NGH THNG TIN TP.HCM


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NI DUNG TRNH BY

To cc applet

i tng ho Graphics

K thut khung hnh ph


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PHN 1TO CC APPLET


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void setVisible(boolean):hin th hoc n

component Dimension getSize(): tr v kch thc ca

component

void setSize(Dimension): thay i kch thc

void setEnabled(): bt hoc tt component

void repaint(): cp nht li component

void update(Graphics g): c gi qua repaint()

void paint(Graphics g): c gi qua update()

void setBackground(Color): t mu nn

...

MT S METHOD CA COMPONENT


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Lp Applet

Java c lp java.applet.Applet k tha tlp java.awt.Component cho php to racc applet trong Web.

Mi lp applet do ngi dng to ra uphi k tha t lp Applet.

XY DNG CC APPLET


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V d 1: To file TestApplet.java

XY DNG CC APPLET

Dch: javac TestApplet.java

import java.applet.Applet;

import java.awt.Graphics;

public class TestApplet extends Applet

{

public void paint(Graphics g)

{

g.drawString(Helloworld!, 50, 25);

}

}


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Thc thi applet Cch 1:To file TestApplet.html c ni dung nhsau:

XY DNG CC APPLET


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public class TestApplet extends Applet

{

public void init() {}public void start() {}

public void stop() {}

public void destroy {}

public void paint(Graphics g) {}}

KHUNG CA MT APPLET C BN


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init(): khi to applet start(): applet bt u hot ng

stop(): applet chm dt hot ng

destroy(): gii phng applet Ch :

paint() khng phi l phng thc ca Applet ml ca Component.

paint() c gi mi khi ca s c v li.

HOT NG CA APPLET


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Vng i ca mt Applet Np mt applet: applet c khi to v thc thi

Chuyn hoc tr v trang Web: Cc phng

thc stop v start s c gi Np li applet: nh qu trnh np applet

Thot khi trnh duyt: phng thc stop vdestroy s c gi

HOT NG CA MT APPLET


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PHN 2LP GRAPHICS


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java.awt.Graphics l lp cung cp cc phng thcv ho c bn:

ng thng (Line)

ng oval (Oval)

Hnh ch nht (Rectangle)

a gic (Polygon)

Vn bn(Text)

Hnh nh (Image)

...

LP GRAPHICS


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H ta LP GRAPHICS


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V ng thng

public void drawLine(int x1, int y1, int x2, int y2); V hnh ch nht

public void drawRect(int x, int y, int width, int height);

T mt hnh ch nht

public void fillRect(int x, int y, int width, int height); Xo mt vng ch nht

public void clearRect(int x, int y, int width, int height);

V a gic

public void drawPolygon(int[] x, int[] y, int numPoint);

public void drawPolygon(Polygon p);

LP GRAPHICS


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public class DemoRect extends Applet

{

public void init()

{

System.out.println("Demonstration of some simple figures");

}


{ g.drawLine(70, 300, 400, 250);

g.drawRect(100, 50, 130, 170);

g.fillRect(120, 70, 70, 70);

int[] x = { 280, 310, 330, 430, 370 };

int[] y = { 280, 140, 170, 70, 90 };

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

}

}

LP GRAPHICS


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LP GRAPHICS


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V ng trn/elip

public void drawOval(int x, int y, int width, int height); T ng trn/elip

public void fillOval(int x, int y, int width, int height);

V cung trn

public void drawArc(int x, int y, int width, int height, intstartAngle, int arcAngle);

V xu k t

public void drawString(String str, int x, int y);

V nh

public void drawImage(Image img, int x, int y,...);

LP GRAPHICS


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public class DemoOval extends Applet

{

public void init()

{

System.out.println("Demonstration of some simple figures");

}public void paint(Graphics g)

{

int xstart = 70, ystart = 40, size = 100;

g.drawOval(xstart, ystart, size, size);

g.drawOval(xstart + (size*3)/4, ystart, size, size);

g.drawOval(xstart + size/2, ystart + size/2, size, size);

g.drawArc(xstart, ystart, 300, 200, 0, -90);

g.drawString("good morning !", xstart + 265, ystart + 90);

}

}

LP GRAPHICS


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LP GRAPHICS


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import java.awt.Image;

public classDemoImage extends Applet

{

public void init()

{System.out.println("Demonstration of imaging");

}


{

Image image = getToolkit().getImage("summer.jpg");

g.drawImage(image, 0, 0, this);

}

}

LP GRAPHICS


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LP GRAPHICS


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LpPoint:biu din im trn mn hnh

Lp Dimension:biu din kch thc v

chiu rng v chiu cao ca mt i tng Lp Rectangle:biu din hnh ch nht

Lp Polygon:biu din a gic

Lp Color:biu din mu sc

CC LP TIN CH KHC


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import java.awt.*;

public class DemoColor extends Applet

{


{

Dimension size = getSize();g.setColor(Color.orange);

g.fillRect(0, 0, size.width, size.height);

Color color = new Color(10, 150, 20);

g.setColor(color);g.drawString("I am a colorful string",

size.width/2 -50, size.height/2);

}

}

CC LP TIN CH KHC


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CC LP TIN CH KHC


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import java.awt.*;

public class DemoFont extends Applet

{


{

Font font = newFont("Arial", Font.BOLD, 30);

g.setFont(font);

g.drawString("I am font Arial, bold, size 30", 50, 50);

}

}

X L FONT V


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PHN 3K THUTKHUNG HNH PH


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K THUT KHUNG HNH PH V d v s di chuyn b nhy


import java.awt.*;

public class DemoMove1 extends Applet

{

private int x = 50;

private int y = 50;


{

if(x > 300) x = 50;

g.fillOval(x, y, 100, 100);

delay(100);

move();

}

//xem tip slide tip theo


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K THUT KHUNG HNH PH V d v s di chuyn b nhy

public void delay(int milisecond)

{

try{

Thread.sleep(milisecond);

} catch(Exception e) { }

}

public void move()

{

x += 5;

repaint();

// ve lai cua so

}

}


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K THUT KHUNG HNH PH

Gii thch l do nhy:

Mi ln gi repaint() th update() c gi

update() xo ni dung ca sv gi paint()

Khc phc:

V hnh vo mt khung hnh ph trong b nh thayv v trc tip ra mn hnh.

Khi v xong, khung hnh ph c hin th ra mnhnh trong phng thc paint().

Np chng update() trnh vic xo ni dung cas.


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K THUT KHUNG HNH PH Gii php

//...

public class DemoMove2 extends Applet

{

//...

private Image offImage;

private Graphics offGraphics;

public void init()

{

// tao khung hinh phu

offImage = createImage(500, 500);

// lay doi tuong do hoa de ve vao khung hinh phu

offGraphics = offImage.getGraphics();

}

//xem tip slide tip theo


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K THUT KHUNG HNH PH Gii php


{

//...

offGraphics.clearRect(0, 0, 500, 500);

offGraphics.fillOval(x, y, 100, 100);

g.drawImage(offImage, 0, 0, this);

//...

}

public voidu pdate(Graphics g)

{

paint(g);

}

//...

}

APPLET


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APPLET

Kh nng ca Applet Applet c t ti mt Server trn mng Applet c chuyn ti my Client theo mt

trang HTML no

Khi mt trnh duyt (tng thch vi Java) nhnc trang web ny, n s ti m ca Applet vthc thi trn my client

APPLET


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APPLET

Gii hn ca Applet Khng c np cc th vin hay cc phngthc s dng m gc(native code).

Khng c c v ghi ln cc tp tin ca myang chy chng.

Khng c khi ng bt k chng trnh notrn my ang chy.

Khng c c bt k tnh cht no ca hthng

BI TP


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BI TP

1. Dng k thut khung hnh ph v mt

qu bng chuyn ng t do trong mtapplet.

2. M rng bi ton vi 2 qu bng.

3. M rng bi ton vi nn applet l mt hnhnh.

4. M rng bi ton vi qu bng l mt hnh

nh v c nhiu qu bng chuyn ngng thi.


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HTBI 5

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