October 13, 2013

Yin Yang Java Swing Program

I wrote this simple YinYang Java Swing Program in my CS202 class back in Spring 2008 at CalStateLA. I thought to share with all.

Code

package com.gaurangjadia.code.java;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JFrame;

public class YinYang extends JFrame {

	private static final long serialVersionUID = 1L;

	public YinYang(){
		super("Yin-Yang Draw Application.");
		this.setSize(500,500);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public void paint(Graphics g){
		super.paint(g);

		int xCenter = getWidth() / 2;
		int yCenter = getHeight() / 2;
		int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4);
		int x = xCenter - radius;
		int y = yCenter - radius;

		g.setColor(Color.white);
		g.fillOval(x, y, 2 * radius, 2 * radius);
		g.setColor(Color.black);
		g.drawOval(x, y, 2 * radius, 2 * radius);
		g.setColor(Color.black);
		g.fillArc(x, y, 2 * radius, 2 * radius, 270, 180);
		g.setColor(Color.white);
		g.fillOval(x + (radius / 2), y, radius, radius);
		g.setColor(Color.black);
		g.fillOval(x + (radius / 2), y + radius, radius, radius);

		g.setColor(Color.black);
		g.fillOval(x + radius - (radius / 4), y + radius / 4, radius / 2, radius / 2);
		g.setColor(Color.white);
		g.fillOval(x + radius - (radius / 4), y + radius + radius / 4, radius / 2, radius / 2);
	}

	public static void main(String args[]) {
		YinYang objYinYang = new YinYang();
		objYinYang.setVisible(true);
	}
}

package com.gaurangjadia.code.java;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

public class YinYang extends JFrame {

private static final long serialVersionUID = 1L;

public YinYang(){

super("Yin-Yang Draw Application.");

this.setSize(500,500);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void paint(Graphics g){

super.paint(g);

int xCenter = getWidth() / 2;

int yCenter = getHeight() / 2;

int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4);

int x = xCenter - radius;

int y = yCenter - radius;

g.setColor(Color.white);

g.fillOval(x, y, 2 * radius, 2 * radius);

g.setColor(Color.black);

g.drawOval(x, y, 2 * radius, 2 * radius);

g.setColor(Color.black);

g.fillArc(x, y, 2 * radius, 2 * radius, 270, 180);

g.setColor(Color.white);

g.fillOval(x + (radius / 2), y, radius, radius);

g.setColor(Color.black);

g.fillOval(x + (radius / 2), y + radius, radius, radius);

g.setColor(Color.black);

g.fillOval(x + radius - (radius / 4), y + radius / 4, radius / 2, radius / 2);

g.setColor(Color.white);

g.fillOval(x + radius - (radius / 4), y + radius + radius / 4, radius / 2, radius / 2);

}

public static void main(String args[]) {

YinYang objYinYang = new YinYang();

objYinYang.setVisible(true);

}

Output

Here is the screenshot of output window.

October 12, 2013

How to Read and Write Data to Property List File(plist) in iOS?

I have written a class called AppHelper which has class level (static) methods. Those methods are very useful to use within UIViewController.

AppHelper.h

//
//  AppHelper.h
//

#import <foundation /Foundation.h>

@interface AppHelper : NSObject {
	
}

+(NSString *)getDocsDirectory;
+(BOOL)setPlist:(NSString *)strPlistName;
+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue;
+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key;

@end

// AppHelper.h

#import <foundation /Foundation.h>

@interface AppHelper : NSObject {

}

+(NSString *)getDocsDirectory;

+(BOOL)setPlist:(NSString *)strPlistName;

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue;

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key;

@end

AppHelper.m

//
//  AppHelper.m
//

#import "AppHelper.h"

@implementation AppHelper

+(NSString *)getDocsDirectory {
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	
	return documentsDirectory;
}

+(BOOL)setPlist:(NSString *)strPlistName {
	NSError *error;
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	
	NSFileManager *fileManager = [NSFileManager defaultManager];
	
	if (![fileManager fileExistsAtPath:path]) {
		NSString *bundle = [[NSBundle mainBundle] pathForResource:strPlistName ofType:@"plist"];
		[fileManager copyItemAtPath:bundle toPath:path error:&error];
		return YES;
	}
	else {
		return NO;
	}
}

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue {
	[self setPlist:strPlistName];
	
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
	
	[data setObject:strValue forKey:key];
	//[data setObject:[NSNumber numberWithInt:strValue] forKey:key];

	[data writeToFile:path atomically:YES];
}

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key {
	[self setPlist:strPlistName];
	
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
	return [data objectForKey:key];
}

// AppHelper.m

#import "AppHelper.h"

@implementation AppHelper

+(NSString *)getDocsDirectory {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

return documentsDirectory;

}

+(BOOL)setPlist:(NSString *)strPlistName {

NSError *error;

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath:path]) {

NSString *bundle = [[NSBundle mainBundle] pathForResource:strPlistName ofType:@"plist"];

[fileManager copyItemAtPath:bundle toPath:path error:&error];

return YES;

}

else {

return NO;

}

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue {

[self setPlist:strPlistName];

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

[data setObject:strValue forKey:key];

//[data setObject:[NSNumber numberWithInt:strValue] forKey:key];

[data writeToFile:path atomically:YES];

}

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key {

[self setPlist:strPlistName];

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

return [data objectForKey:key];

}

October 10, 2013

Install Git on CentOS and Host on Apache

Install git from the yum repository

If you have error regarding GPG KEYS then please check my answer on StackOverflow.com

Install git from the yum repository

yum install git git-daemon

1	yum install git git-daemon

Configure Git and Init bare repository

$ cd /var/www/
$ mkdir git
$ cd git
$ mkdir repos.git
$ cd repos.git
$ git init --bare
$ chown -R apache:apache /var/www/git/
$ mv /var/www/git/repos.git/hooks/post-update.sample /var/www/git/repos.git/hooks/post-update
$ chmod +x /var/www/git/repos.git/hooks/post-update
$ cd /var/www/git/repos.git
$ sudo -u apache git update-server-info
$ cd /etc/httpd/conf.d
$ vim git.conf

$ cd /var/www/

$ mkdir git

$ cd git

$ mkdir repos.git

$ cd repos.git

$ git init --bare

$ chown -R apache:apache /var/www/git/

$ mv /var/www/git/repos.git/hooks/post-update.sample /var/www/git/repos.git/hooks/post-update

$ chmod +x /var/www/git/repos.git/hooks/post-update

$ cd /var/www/git/repos.git

$ sudo -u apache git update-server-info

$ cd /etc/httpd/conf.d

$ vim git.conf

Apache Virtual Host directive

<virtualhost *:80>
	Servername git.example.org
	DocumentRoot /var/www/git
	
	<directory "/var/www/git">
		DAV On
		Options +Indexes +FollowSymLinks 
		
		Deny from all
		AuthType Basic
		AuthName "Git Repository"
		AuthUserFile /etc/git-auth-conf
		AuthGroupFile /etc/git-group-conf
		Require valid-user
	</directory>
</virtualhost>

Servername git.example.org

DocumentRoot /var/www/git

DAV On

Options +Indexes +FollowSymLinks

Deny from all

AuthType Basic

AuthName "Git Repository"

AuthUserFile /etc/git-auth-conf

AuthGroupFile /etc/git-group-conf

Require valid-user

</directory>

</virtualhost>

Restart Apache

$ service httpd restart

1	$ service httpd restart

Gaurang Jadia

Nothing is permanent except change

Category Archives: Technical

Yin Yang Java Swing Program

Code

Output

How to Read and Write Data to Property List File(plist) in iOS?

AppHelper.h

AppHelper.m

Install Git on CentOS and Host on Apache

Install git from the yum repository

Install git from the yum repository

Configure Git and Init bare repository

Apache Virtual Host directive

Restart Apache