Atan2 Example Syntax VB.NET ASP.NET | Atan2 | Source Code

Posted by on Saturday, May 14, 2011 · Leave a Comment 

Atan2 Example Syntax VB.NET ASP.NET | Atan2 | Source Code

Summary: – Illustrates using with in VB.NET ASP.NET.


View Other VB.NET ASP.NET Source Code Examples


Purpose:
takes 2 double data type numbers and returns a double value
containing the angle (measured in radians) whose tangent is the
quotient of two specified numbers (you can convert
the radians to degrees by multiplying them by Math.PI/180)

Syntax:
Atan2(y as double, x as double)

Parameters Description
y double – y is the y coordinate of a point
x double – x is the x coordinate of a point

Result Data Type Description
double the angle measured in radians. (you can
convert the radians to degrees by multiplying
them by Math.PI/180)

Quick Example
Atan2(1, 1) ‘ Returns .785398163397448

Step 1: Click on Visual Basic to Cut-n-paste code into Atan2.aspx.vb

 
Imports System
Imports System.IO
Imports System.Data
Imports System.Math
 
'********************************************************************************
' Purpose: takes 2 double data type numbers and returns a double value
' containing the angle (measured in radians) whose tangent is the
' quotient of two specified numbers (you can convert
' the radians to degrees by multiplying them by Math.PI/180)
'
' Syntax: 	Atan2(y as double, x as double)
'
' Parameter1: y - double - y is the y coordinate of a point
'
' Parameter2: x - double - x is the x coordinate of a point
'
' Result: double - the angle measured in radians. (you can
' convert the radians to degrees by multiplying
' them by Math.PI/180)
'
' Quick Example: Atan2(1, 1) ' Returns .785398163397448
'
'********************************************************************************
' This example is from http://idealprogrammer.com
 
 
 
Partial Class _Atan2
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
 
        Label1.Text = "Example #1: 	Atan2(0, 0)"
 
 
        TextBox1.Text = Atan2(0, 0) ' Returns 0
 
 
        Label2.Text = "Example #2: Atan2(1, 1)"
 
 
        TextBox2.Text = Atan2(1, 1) ' Returns .785398163397448
 
 
        Label3.Text = "Example #3: 	Atan2(1, 2)"
 
 
 
 
        TextBox3.Text = Atan2(1, 2) ' Returns .463647609000806
 
 
    End Sub
End Class

Step 2: Click on XML to Cut-n-paste code into Atan2.aspx

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Atan2.aspx.vb" Inherits="_Atan2" %>
 
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
 
 
 
    </div>
    </form>
</body>
</html>

Prerequistes:

  1. Install Visual Web Developer 2010
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

VB.NET ASP.NET Syntax Functions MathFunctions Atan2
  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select Visual Basic for Language
    • name of Web Site could be VBNET_ASPNET_Syntax.
  3. Add New folder named “Functions”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: Functions
  4. Add New subfolder named “MathFunctions”
    • Right-click Functions folder in solution explorer;
    • add new folder;
    • name of folder could be: MathFunctions
  5. Add Web Form Named Atan2 to MathFunctions folder
    • Right-click MathFunctions folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be Atan2
  6. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Atan2.aspx.vb
  7. Click on XML in step 2 above to copy code into web form Atan2.aspx
  8. Right-click on Atan2.aspx in solution explorer and select view in browser

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