sábado, 24 de septiembre de 2011

Tabla de multiplicar en java

9/24/2011

Hoy veremos como crear una tabla demultiplicarcon botones es muy sencillo este ejemplo es mas para las personas que seestániniciando en laprogramaciónjava, lo que hacemos es unmétodoque contenga un valor en este caso un item del combobox para que un bucle for añada la cantidad de botones con un limite de 12 y con lainstrucciónsetText(""+nu+"x"+a+"="+nu*a); se realiza laoperacióndemultiplicacióny listo.
este es un fragmento delcódigodelmétodoencuestión
for(int a=1; a=12; a++)
{
JButton boton=new JButton();
boton.setFont(new Font("Dialog", Font.BOLD, 14));
boton.setText(""+nu+"x"+a+"="+nu*a);
panel_botones.add(boton);
panel_botones.updateUI();//ACTUALIZO EL PANEL
}


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viernes, 23 de septiembre de 2011

Ascii Art en texto en java

9/23/2011

En un post anterior vimos como hacer ascii art conimágenes, en esta ocacion veremos como realizarlo con texto esbásicamentelo mismo solo queaquíutilizamos lainstrucciónStringBuilder para convertir el texto y añadirle caracteres como estos # ,*
este es elcódigoque lo hace posible, y utilizamos uncódigomas reducido que en el post anterior

for (int y = 0; y 32; y++) {
StringBuilder sb = new StringBuilder();
for (int x = 0; x 144; x++)
{
sb.append(image.getRGB(x, y) == -16777216 ? " " : image.getRGB(x, y) == -1 ? "#" : "*");
}
if (sb.toString().trim().isEmpty())continue;
area.append(sb.toString()+ "\n");
}







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miércoles, 14 de septiembre de 2011

Crear ejecutables .exe en java con JavaExe y Inno Setup (Parte 3 Final)

9/14/2011










Hoy veremos como crear instaladores con JavaExe y InnoSetup que es un compilador mas usado por que le da buenas propiedades a los instaladores como:escogerel idioma de la instalacion,colocar la carpeta del programa enmenúinicio,crear un acceso directo, poderdes instalarloetc,Inno Setup es uno de mis favoritos al crear un instalador en javarecomendado


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domingo, 11 de septiembre de 2011

Como Arrastrar y soltar objetos con un JToolbar(Barra de herramientas) en java

9/11/2011
Hoy veremos como arrastrar cualquier objeto que este incorporado en una barra de herramientas,como lo hacemos con la ayuda de los eventos delratón,mouseReleased,mousePressed,mouseDragged y con el objetocursor,lo que se hace es extraer laposicióndel objeto y el tamaño del objeto a arrastrar y lasdimensionesdel contenedor a colocarse todo esto se lo hace por medio de un calculo simple(suma y resta), luego se crea unmétodoconstructor el cual va arecibirel objeto y los valores del objetos(lasdimensiones) y listo
métodoque recibe el objeto y lasdimensiones

public Component new_boto(JButton obj, int x, int y)
{
final JButton boto = new JButton(obj.getIcon());
boto.setOpaque(true);
boto.setHorizontalAlignment(SwingConstants.CENTER);
boto.setForeground(obj.getForeground());
boto.setBackground(obj.getBackground());
boto.setBounds(x,y,obj.getWidth(),obj.getHeight());
boto.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseDragged(java.awt.event.MouseEvent e) {
boto.setLocation( boto.getX() + e.getX() - boto.getWidth() / 2,
boto.getY() + e.getY() - boto.getHeight() / 2);
}
});
return(boto);
}






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sábado, 10 de septiembre de 2011

Convertir imágenes a Ascii Art en java

9/10/2011



Hoy veremos como convertir cualquier imagen a Ascii Art, ¿que es Ascii Art?
es procesar dibujos con los caracteresCÓDIGOAMERICANOESTÁNDARDE INTERCAMBIO DE INFORMACION(Ascii), actualmente su uso ya es muy conocido en logos de empresas,blogs,foros,etc asta facebook.
Tipos de Ascii Art
  • Ascii Art de imagenes en Blanco y Negro
  • Acii Art de imagenes en escala de grises
  • Acii Art de los bordes de una imagen
El ejemplo utilizado es de tipo blanco y negro
¿Como funciona?
Dada una imagen en blanco y negro, se van tomando 4 pixeles de 2x2 y se van comparando de acuerdo a un patron previamente definido de una imagen, se toman los caracteres ASCII que se asemejen más a la forma que tienen los 4 pixeles extraidos, esto para que la imagen una vez formada, sea lo mas posible fiel a la original.


Los pixeles se iran leyendo fila por fila, saltandose una linea de pixeles, esto para que la imagen resultante no se vea demasiado alargada, las columnas se leen de 2 en 2. La iamgen resultante, dependera tambien del tipo de caracter con el que se imprima, debe escogerse un caracter lo mas cuadrado posible, por ejemplo"Lucida Console".


Cada 4 pixeles leidos, corresponden a un caracter ascii y estos seran unidos a una cadena de texto, cuando se llegue al final de una columna, debe agregarse
un "salto de carro" (\n) y continuarse con la siguiente hilera.




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viernes, 9 de septiembre de 2011

Mega Pack de tutoriales java

9/09/2011
Hoy les presento un mega pack de tutoriales en PDF y unos cuantos ejemplos de todo un poco para que se te haga masfácilaprender java a fondo, en el paquete incluye cosas como:
  • manejo de eventos
  • objetos
  • hilos o thread
  • conexióna base de datos
  • ventanas de bienvenida o splash
  • java y usb
  • bluetooh desde java
  • etc....








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