trigonometricfunction.cs

Visual C#2005程序设计教程

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

namespace WinCtrlLib11_1创建ActiveX控件
{
    public partial class TrigonometricFunction : UserControl
    {
        int a = 1;   // 用于判断被选中的单选按钮
        public TrigonometricFunction()
        {
            InitializeComponent();
        }

        private void radSin_CheckedChanged(object sender, EventArgs e)
        { if (radSin.Checked) { a = 1; lblInfo.Text = radSin.Text; } }

        private void radCos_CheckedChanged(object sender, EventArgs e)
        { if (radCos.Checked) { a = 2; lblInfo.Text = radCos.Text; } }

        private void radTan_CheckedChanged(object sender, EventArgs e)
        { if (radTan.Checked) { a = 3; lblInfo.Text = radTan.Text; } }

        private void radCot_CheckedChanged(object sender, EventArgs e)
        { if (radCot.Checked) { a = 4; lblInfo.Text = radCot.Text; } }

        private void btnOK_Click(object sender, EventArgs e)
        {
            if (double.Parse(txtValue.Text) > 360 || txtValue.Text == "")
            {
                MessageBox.Show("请输入小于360度的角度值",
                    "注意", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            switch (a)
            {
                case 1:
                    txtResult.Text = Math.Round(Math.Sin(double.Parse
                        (txtValue.Text) * Math.PI / 180), 4).ToString();
                    break;
                case 2:
                    txtResult.Text = Math.Round(Math.Cos(double.Parse
                        (txtValue.Text) * Math.PI / 180), 4).ToString();
                    break;
                case 3:
                    if (double.Parse(txtValue.Text) == 90 || double.Parse(txtValue.Text) == 270)
                        txtResult.Text = "函数值不存在!";
                    else
                        txtResult.Text = Math.Round(Math.Tan(double.Parse
                            (txtValue.Text) * Math.PI / 180), 4).ToString();
                    break;
                case 4:
                    if (double.Parse(txtValue.Text) == 0 || double.Parse(txtValue.Text) == 180
                        || double.Parse(txtValue.Text) == 360)
                        txtResult.Text = "函数值不存在!";
                    else
                        txtResult.Text = Math.Round(1 / Math.Tan(double.Parse
                            (txtValue.Text) * Math.PI / 180), 4).ToString();
                    break;
            }
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            txtResult.Text = "";
            txtValue.Text = "";
            txtValue.Focus();
        }
    }
}