Programacion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Codigo_Colores_Resistencias_01
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

private int a = 1;
        private int b = 0;
        private int c = 2;
        private int d = 0;
        private double valor;
        private double[] multiplos = {1, 10, 100, 1000, 10000, 100000, 1000000, 0.1, 0.01 };
        private string cadena;

private void Form1_Load(object sender, EventArgs e)
        {
            comboBox1.SelectedIndex = 1;
            comboBox2.SelectedIndex = 0;
            comboBox3.SelectedIndex = 2;
            comboBox4.SelectedIndex = 0;
        }

private void calcular()
        {
            valor = ((a * 10) + b) * multiplos[c];
            if (c == 7 || c == 8)
            {
                if (c == 8)
                    valor = Math.Round(valor, 2);
                else
                    valor = Math.Round(valor, 1);
                cadena = valor.ToString();
            }
            else
            {
                cadena = valor.ToString();
            }

if (valor >= 1000 && valor < 1000000)
            {
                valor = valor / 1000;
                cadena = valor + "K";
            }
            else
            {
                if (valor >= 1000000)
                {
                    valor = valor / 1000000;
                    cadena = valor + "M";
                }
            }
            
            label2.Text = cadena + "Ω " + d + "%";
        }

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            a = comboBox1.SelectedIndex;
            calcular();
            panel1.Invalidate();
        }

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            b = comboBox2.SelectedIndex;
            calcular();
            panel1.Invalidate();
        }

private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
        {
            c = comboBox3.SelectedIndex;
            calcular();
            panel1.Invalidate();
        }

private void comboBox4_SelectedIndexChanged(object sender, EventArgs e)
        {
            d = comboBox4.SelectedIndex;
            if (d == 0)
                d = 5;
            else
                d = 10;
            calcular();
            panel1.Invalidate();
        }

private void panel1_Paint(object sender, PaintEventArgs e)
        {
            int tol;
            SolidBrush Brush1 = colores(a);
            SolidBrush Brush2 = colores(b);
            if (c > 6)
                tol = c + 3;
            else
                tol = c;
            SolidBrush Brush3 = colores(tol);
            if (d == 5)
                tol = 10;
            else
                tol = 11;
            SolidBrush Brush4 = colores(tol);
            Graphics miGraphics = e.Graphics;
            miGraphics.FillRectangle(Brush1, 40, 0, 15, 55);
            miGraphics.FillRectangle(Brush2, 70, 0, 15, 55);
            miGraphics.FillRectangle(Brush3, 100, 0, 15, 55);
            miGraphics.FillRectangle(Brush4, 150, 0, 15, 55);
        }

private SolidBrush colores(int indice)
        {
            SolidBrush brocha;
            switch (indice)
            {
                case 0:
                    brocha = new SolidBrush(Color.Black);
                    break;
                case 1:
                    brocha = new SolidBrush(Color.Brown);
                    break;
                case 2:
                    brocha = new SolidBrush(Color.Red);
                    break;
                case 3:
                    brocha = new SolidBrush(Color.Orange);
                    break;
                case 4:
                    brocha = new SolidBrush(Color.Yellow);
                    break;
                case 5:
                    brocha = new SolidBrush(Color.Green);
                    break;
                case 6:
                    brocha = new SolidBrush(Color.Blue);
                    break;
                case 7:
                    brocha = new SolidBrush(Color.Violet);
                    break;
                case 8:
                    brocha = new SolidBrush(Color.Gray);
                    break;
                case 9:
                    brocha = new SolidBrush(Color.White);
                    break;
                case 10:
                    brocha = new SolidBrush(Color.Gold);
                    break;
                case 11:
                    brocha = new SolidBrush(Color.Silver);
                    break;
                default:
                    brocha = new SolidBrush(Color.Black);
                    break;
            }
            return brocha;
        }
    }
}

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