# Text on Path with VB.NET

, 2 May 2006
 Rate this:
Please Sign up or sign in to vote.
A VB.NET class for drawing text on a path.

## Introduction

I searched the internet for a long time for some algorithm to display a "Text on a Path", but I only fond the Batik SVG Toolkit. It's a Java project for displaying SVG. SVG has the ability to display "Text on a Path", but I only needed the Text on Path functionality.

So, I started recollecting my old math education, and coded the first lines to calculate the angle of defined position on a path.

Do you remember a²+b²=c²? That is the base to solve this problem. You need two points on a straight line.

```Private Function GetAngle(ByVal _point1 As PointF, _
ByVal _point2 As PointF) As Decimal
Dim c As Decimal
c = Math.Sqrt((_point2.X - _point1.X) ^ 2 + _
(_point2.Y - _point1.Y) ^ 2)
'Oh yeah good old math a²+b²=c²

If c = 0 Then
Return 0
End If 'We must change the side where the triangle is
If _point1.X > _point2.X Then
Return Math.Asin((_point1.Y - _point2.Y) / c) * _
180 / Math.PI - 180
Else
Return Math.Asin((_point2.Y - _point1.Y) / c) * _
180 / Math.PI
End If

End Function```

## Using the code

You can use the `TextOnPath` class to get a bitmap with the text on the given path.

The path must be set as `PathData`. You can also the the `TextPathPosition` (`Under`, `Center`, `Above`) and the align the text (`Left`, `Center`, `Right`).

```Dim _points(5) As PointF
Dim _top As TextOnPath.TextOnPath = New TextOnPath.TextOnPath
Dim _gp As GraphicsPath = New GraphicsPath

_points(0) = New PointF(81, 183)
_points(1) = New PointF(321, 305)
_points(2) = New PointF(333, 622)
_points(3) = New PointF(854, 632)
_points(4) = New PointF(864, 153)
_points(5) = New PointF(562, 224)
_gp.AddCurve(_points)

_top.PathDataTOP = _gp.PathData
_top.FontTOP = New Font("Microsoft Sans Serif", _
36, FontStyle.Regular)
_top.FillColorTOP = Color.Black
_top.ColorTOP = Color.White
_top.TextTOP = "Text on path goes around a path"
_top.ShowPath = True
_top.PathAlignTOP = TextOnPath.PathAlign.Center
_top.LetterSpacePercentage = 100
_top.TextPathPosition = TextOnPath.TextPosition.CenterPath

Dim oBitmap as Bitmap
oBitmap = _top.TextOnPathBitmap```

You can also get the new path data as an SVG string, so you can use it in HTML with Adobe SVG Viewer, or in Corel Draw or Adobe Illustrator.

```Dim _svg As String
_svg = _top.GetSVG(1024, 768)```

## Points of interest

If someone has ideas to optimize this code, please contact me, and sorry for the bad English and the short description. This is my first article, and I'm still learning.

## History

• Version 1.0 released.
• Version 1.01 released (`PathPoint` calculation optimized).

## License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

## About the Author

Software Developer
Germany
No Biography provided

## Comments and Discussions

 First Prev Next
 draw text within any path? ASPUIPAB 29-Oct-11 12:39
 C# version and with optimization. guidebee 9-Jul-09 18:15
 Great job sf4all 15-Jul-09 5:45
 Re: C# version and with optimization. Member 7402166 21-Apr-11 6:21
 Re: C# version and with optimization. Marc Clifton 14-Sep-14 6:25
 Interested in getting 1 developer license LarryKudrow 17-Mar-08 6:49
 Problem with Running Project bnjneer 5-Jan-08 15:30
 Problems mysticwars 13-Apr-07 10:36
 Sqrt and Decimal Wesner Moise 2-May-06 20:11
 Re: Sqrt and Decimal jarvisa 29-May-06 23:55
 VGdotnet PSwartzell1 24-Apr-06 6:51
 Excellent chimeric69 23-Apr-06 17:53
 Interesting graphical effect... Vlad Stanciu 21-Apr-06 9:32
 You have my 5.   `protected internal static readonly ... and I wish the list could continue ...`
 Last Visit: 31-Dec-99 19:00     Last Update: 28-Dec-14 10:31 Refresh 1

General    News    Suggestion    Question    Bug    Answer    Joke    Rant    Admin

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.141223.1 | Last Updated 2 May 2006
Article Copyright 2006 by Alexander Seel
Everything else Copyright © CodeProject, 1999-2014
Layout: fixed | fluid