AREA

Programa que implemente una clase y me permita calcular el área de la circunferencia.

CLASE CALCULO  

package appdibujarcirculocalculararea;

import java.awt.Graphics;

import java.awt.*;

public class Calculos {

private int Xo,Yo;

private int X1,Y1;

public Calculos(int Xo, int Yo, int X1, int Y1){

this.Xo = Xo;

this.Yo = Yo;

this.X1 = X1;

this.Y1 = Y1;}

private double DistanciaPuntos(){

double d = Math.sqrt((Math.pow((this.X1 - this.Xo), 2)) + (Math.pow((this.Y1 - this.Yo),2)));

return d;   }

public double AreaCirculo(){

double distancia = this.DistanciaPuntos();

double radio = distancia / 2;

double area = Math.PI * Math.pow(radio, 2);

return area;   }}

CLASE JPANEL

package appdibujarcirculocalculararea;

import java.awt.Graphics;

import java.awt.*;

public class Panel extends javax.swing.JPanel {

private int Xo,Yo;

private int X1,Y1;

public void setX1(int X1) {

this.X1 = X1; }

public void setXo(int Xo) {

this.Xo = Xo;}

public void setY1(int Y1) {

this.Y1 = Y1;  }

public void setYo(int Yo) {

this.Yo = Yo;  }

public Panel() {

initComponents(); }

@SuppressWarnings(“unchecked”)

@Override

public void paint(Graphics g) {

super.paint(g);

g.setColor(Color.red);

g.drawOval(this.Xo, this.Yo, this.X1, this.Y1);

Calculos Obj = new Calculos(this.Xo, this.Yo, this.X1, this.Y1);

double a = Obj.AreaCirculo();

String cadena = “Area = “ + String.valueOf(a);

g.drawString(cadena, 10, 15); }

public void DibujarCirculo()  {

repaint(); }}

CLASE JFRAME

package appdibujarcirculocalculararea;

public class Principal extends javax.swing.JFrame {

public Principal() {

initComponents();

@SuppressWarnings(“unchecked”)

private void btngraficarActionPerformed(java.awt.event.ActionEvent evt) {

int Xo = Integer.parseInt(this.textX0.getText());

int Yo = Integer.parseInt(this.texty0.getText());

int X1 = Integer.parseInt(this.textX1.getText());

int Y1 = Integer.parseInt(this.texty1.getText());

panel1.setXo(Xo);

panel1.setYo(Yo);

panel1.setX1(X1);

panel1.setY1(Y1);

panel1.DibujarCirculo(); }

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new Principal().setVisible(true);} }); }

private javax.swing.JButton btngraficar;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JLabel jLabel4;

private javax.swing.JLabel jLabel5;

private javax.swing.JLabel jLabel6;

private javax.swing.JPanel jPanel1;

private appdibujarcirculocalculararea.Panel panel1;

private javax.swing.JTextField textX0;

private javax.swing.JTextField textX1;

private javax.swing.JTextField texty0;

private javax.swing.JTextField texty1;

}