KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q153927: HOWTO: Create Pie Charts Using the Circle Method in VB

Article: Q153927
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:4.0
Operating System(s): 
Keyword(s): kbgraphic kbprogramming kbVBp400
Last Modified: 11-JAN-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 
-------------------------------------------------------------------------------

SUMMARY
=======

The Pinnacle-BPS Graph control shipping with Visual Basic gives users the
ability to create pie charts. The Pinnacle-BPS is a relatively large control and
uses a large amount of disk space on distribution disks. Therefore, the custom
effects available are limited to the features of the control. The Circle method
in the VBA language provides functionality to draw arcs and segments. By drawing
segments, you can easily create a pie chart and add custom features as you
require. Below is a code sample demonstrating how to do this.

MORE INFORMATION
================

1. Start a new Visual Basic project. Form1 is created by default.

2. Place a Command button on the form.

3. Place a 200x200 pixel Picture box on the form.

4. Add the following code to the Form1 code window:

        Option Explicit

        Public Sub DrawPiePiece(lColor As Long, fStart As Double, fEnd As
        Double)
          Const PI As Double = 3.14159265359
          Const CircleEnd As Double = -2 * PI
          Dim dStart As Double
          Dim dEnd As Double
          Picture1.FillColor = lColor
          Picture1.FillStyle = 0
          dStart = fStart * (CircleEnd / 100)
          dEnd = fEnd * (CircleEnd / 100)
          Picture1.Circle (100, 100), 60, , dStart, dEnd
        End Sub

        Private Sub Command1_Click()
          Picture1.ScaleMode = vbPixels
          Call DrawPiePiece(QBColor(1), 0.001, 36)
          Call DrawPiePiece(QBColor(2), 36, 55)
          Call DrawPiePiece(QBColor(3), 55, 75)
          Call DrawPiePiece(QBColor(4), 75, 99.999)
        End Sub

5. Press the F5 key to run the project. You should see a pie chart being drawn
  with four sections mirroring the four times that the DrawPiece routine was
  called in the Command1_Click event.


REFERENCES
==========

For more information, please see the following articles in the Microsoft
Knowledge Base:

  Q83906 How to Draw an Ellipse with Circle Statement in VB

  Q73280 Overflow in VB Drawing Circle Segment w/ Radius of Zero

Instead of using the Circle method in the VBA language, you can also use the
Win16/Win32 API Call to achieve the same result.

Additional query words:

======================================================================
Keywords          : kbgraphic kbprogramming kbVBp400 
Technology        : kbVBSearch kbAudDeveloper kbVB400Search kbVB400 kbVB16bitSearch
Version           : WINDOWS:4.0
Issue type        : kbhowto

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.