Drawing of 2-d Primitives

8/2/2019 Drawing of 2-d Primitives

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DRAWINGOF 2-DPRIMITIVES

By:- Shreyansh Gang

C.S.E IV Year


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FLOW OF THE PRESENTATION

Organization

Languageused for theProject

Project


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ORGANIZATIONWHERE I DIDMYTRAINING


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About DRDO

TechnologyAreas


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ABOUT DRDO :

DRDO was formed in 1958.

Responsible for the development of technology for

use by the military.

Design, develop and lead to production state-of-the-art sensors, weapon systems, platforms and

allied equipment for our Defence Services.


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TECHNOLOGY AREAS :

AeronauticsEngineering

Armaments

CombatEngineering

Electronics

Life Science

Materials Missiles

NavalSystem


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DrawingOf 2-D

Primitives

LanguageUsed

GraphicsObject

ComponentsOf Project

Run TheProject


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LANGUAGE USED :


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WHY JAVA ONLY :-

C++ JAVA


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A BRIEF HISTORYOF JAVA

Sun Microsystems 1990

Green Project

James Gosling Oak 1992 green Project Spun Off

1994 Focus targeted to Web technology

1994 Oak renamed to JAVA

1995 - Java was first publicly released.


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JAMES GOSLING

James Gosling is generally creditedas the inventor of the Javaprogramming language

He was the first designer of Java andimplemented its original compiler andvirtual machine

He is also known as the Father of

Java


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FEATURES OF JAVA :-

Simple

Familiar

Secure

Portable Object-oriented

Multithreaded

Interpreted

Distributed Dynamic


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GRAPHICS PRIMITIVES :-

Point

Line

Rectangle Arc

Oval Polygon

String


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HOW THESE PRIMITIVES ARE DRAWN:-


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LINE:

Lines are drawn by means of the drawLine( )method, shown here:

void drawLine(int startX, int startY,int endX, int endY)

drawLine( ) displays a line in the current drawingcolor that begins at startX, startYand ends at endX,endY.


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RECTANGLE:

The drawRect( ) and fillRect( ) methods display an

outlined and filled rectangle, respectively.

They are shown here:

void drawRect(int top, int left, int width,

int height)void fillRect(int top, int left, int width, int height)


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ELLIPSE AND CIRCLE:

To draw an ellipse, use drawOval( ). To fill anellipse, use fillOval( ). These methods are shownhere:

void drawOval(int top, int left, int width,

int height)

void fillOval(int top, int left, int width,

int height)


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ARC:

Arcs can be drawn with drawArc( ) and fillArc(),shown here:

void drawArc(int top, int left, int width, int height, intstartAngle, int sweepAngle)

void fillArc(int top, int left, int width, int height,int startAngle, int sweepAngle)


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POLYGON:

It is possible to draw arbitrarily shaped figures usingdrawPolygon( ) and fillPolygon( ), shown here:


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COMPONENTS OF PROJECT:

EventHandling

Frame

Applet


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APPLET


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Applets are small applications that are accessed on anInternet server, transported over the Internet, automaticallyinstalled, and run as part of a Web document.

Applets are used to provide interactive features to webapplications that cannot be provided by HTML alone.

They can capture mouse inputand also have controls like

buttonsor check boxes. In response to the user action anapplet can change the provided graphic content. This makesapplets well suitable for demonstration, visualization andteaching.


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LIFE CYCLE OF AN APPLET


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FRAMES:

Frame encapsulates what is commonly thought ofas a window.

It is a subclass of Window and has a title bar, menu

bar, borders, and resizing corners.

Two of Frames constructors:

Frame( )

Frame(String title)


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THECLASSHIERARCHYFOR FRAME :


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EVENT HANDLING:

With event-driven programming, events aredetected by a program and handled appropriately

Events: moving the mouseclicking the button

pressing a keysliding the scrollbar thumb

choosing an item from a menu


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THREE STEPSOF EVENT HANDLING

1 Prepare to accept eventsimport package java.awt.event

2 Start listening for eventsinclude appropriate methods

3 Respond to eventsimplement appropriate abstract method


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1. PREPARETOACCEPTEVENTS

Import package java.awt.event

Applet manifests its desire to accept events by

promising to implement certain methods Example:

ActionListener for Button events

AdjustmentListener forScrollbar events


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2. STARTLISTENINGFOREVENTS

To make the applet listen to a particular event,

include the appropriate addxxxListener.

Examples:addActionListener(this)

shows that the applet is interested inlistening to events generated by thepushing of a certain button.


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3. RESPONDTOEVENTS

The appropriate abstract methods areimplemented.

Example:actionPerformed() is automatically

called whenever the user clicks thebutton.Thus, implement actionPerformed() torespond to the button event.


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Drawing of 2-d Primitives