Atan2 Example Syntax VB.NET ASP.NET | Atan2 | Source Code
Atan2 Example Syntax VB.NET ASP.NET | Atan2 | Source Code
Summary: – Illustrates using Atan2 with Source Code Syntax Example in VB.NET ASP.NET.
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)
Atan2(y as double, x as double)
Parameters | Description | y | double – y is the y coordinate of a point |
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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) |
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Quick Example | Atan2(1, 1) ‘ Returns .785398163397448 |
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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:
- Install Visual Web Developer 2010
- Install SQL Server Express
- Download Northwind and Pubs Databases
- Attach Northwind Database to Databases in Sql Express
- 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:
- Use Visual Web Developer 2010
- 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.
- Add New folder named “Functions”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Functions
- Add New subfolder named “MathFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: MathFunctions
- 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
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Atan2.aspx.vb
- Click on XML in step 2 above to copy code into web form Atan2.aspx
- Right-click on Atan2.aspx in solution explorer and select view in browser