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   源码介绍

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电容放电计时计算器

可以计算容性负载过流保护时间，配置熔断器等

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        float c, u, r, i, t, uc;
        bool button2_clik;
        
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
            
            if (textBox1.Text == "")
                MessageBox.Show("请输入容值");
            else if (textBox2.Text == "")
                MessageBox.Show("请输入电压");
            else if (textBox3.Text == "")
                MessageBox.Show("请输入阻值");
            else if (textBox4.Text == "")
                MessageBox.Show("请输入电流");
            else
            {
                c=float.Parse( textBox1.Text);
                u = float.Parse(textBox2.Text);
                r = float.Parse(textBox3.Text);
                i = float.Parse(textBox4.Text);
                t= ((float)(Math.Log(i * r / u,Math.E )))*(-r)*c; //Log(a,b)这里以b为底
                uc = u * (1 -(float)( Math.Exp( -t / r / c)));
                textBox5.Text = t.ToString();
                textBox6.Text = uc.ToString();
            }
            

        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            int halfWidth = panel1.Width / 2;
            int halfHeight = panel1.Height / 2;
            Pen mypen = new Pen(Color.Blue, 2);
            AdjustableArrowCap arrow = new AdjustableArrowCap(8, 8, false);
            mypen.CustomEndCap = arrow;
            g.DrawLine(mypen, 7, halfHeight, panel1.Width - 7, halfHeight);
            g.DrawLine(mypen, halfWidth, panel1.Height - 5, halfWidth, 5);
            g.TranslateTransform(panel1.Width / 2,panel1.Height / 2);
             if(button2_clik)
            {
             
              Point[] points = new Point[1000];
              for (int j = 1; j < points.Length; j  )
              {
                  points[j] = new Point(j, Convert.ToInt32(-u * (1 - (float)(Math.Exp(-j / r / c)))));
              }
              g.DrawLines(Pens.Red, points);
              }

            }

        private void button2_Click(object sender, EventArgs e)
        {
            button2_clik = true;
            panel1.Refresh();
        }
    }
}