Moxie Data Weblog - Wednesday, February 20, 2008

Wrapped Text with GDIPlusX

I was recently asked if it was possible to do "Wrapped Text" with GDIPlusX. I wasn’t sure what they meant at first, but found out they wanted a text string to render in the form a circle, instead of a straight line. While there is nothing built into the library that can do this, I knew it was possible to write your own code to get this functionality.

I dug around and found an excellent article written by Sjaak Priester. He came up with a very interesting technique. By using the FlattenPath method of a GraphicsPath and some straight forward geometry, he was able to not only get a text string to render in a circle, but to get a text string to render in any shape by using a GraphicsPath as a guide. He developed a very nice little C++ class to handle this. I was impressed by the simple yet powerful technique he was using, I decided to try it using the GDIPlusX library.

The results are attached. A relatively straight forward, 300+ line class that takes a GraphicsPath guide, a String of text and a Font and fills a second GraphicsPath with the rendered string, following the specified path. Once you have this rendered path, you can do all kinds of cools stuff with it (check out some of the text effect samples with the GDIPlusX samples download).

Included in this download is the WrappedText class, a demo form as well as the 1.10 version of the GDIPlusX library (compiled into an app). To run the demo, issue a:

DO FORM WRAPPEDTEXTDEMO

WrappedTextDemo.zip (210.63 KB)

Friday, January 11, 2008 7:56:52 AM (Eastern Standard Time, UTC-05:00)

Comments [2]

The GDIPlusX Library Has Been Updated...Into Production

The GDIPlusX library, part of the VFPX project, has been updated and moved into production status. Rumor has it that many people were using it in a production environment already (including myself) but now its official.

With this release we have added SYSTEM.APP. This APP includes the entire library in a single distributable. Rick Strahl made this recommendation at SWFox and we liked the idea. Of course, if you prefer to compile the library into your own application, you can do still do that also. All of the source is still downloadable from VFPX.

A few other features were packed into this release based on feedback that we have received in the past few months. We would like to thank Christof Wollenhaupt , Alan Stevens, Carlos Alloatti, several members of the Foxite message board and of course Craig Boyd for your valuable contributions. Special thanks to Cesar Chalom for all of his efforts in this last release. Most all of the new enhancements were added by Cesar as well as several cool new samples…if you haven’t downloaded it yet, you should really check it out as well as the other great projects on VFPX.

Friday, January 11, 2008 7:12:44 AM (Eastern Standard Time, UTC-05:00)

Comments [0]

An updated version of the GDIPlusX library has been posted

It has taken a while, but the GDIPlusX library is finally converted to be PRG based and has been upgraded from Alpha to Beta status. The new 1.00b version can be downloaded from here. But you should always check the GDIPlusX home page for the latest version.

There were several advantages to converting the library as I described in a message on the VFPX discussion board. The library is faster, smaller and more stable than before.

Special thanks to Cesar Chalom. Most all of the bug fixes and new features were added by him over the past couple of months while I converted the library.

We will hopefully update the project again from Beta to Production status by next month. We welcome any feedback. If you have any issues with the library, make sure you post them in the Issue Tracker so they can be prioritized and voted on.

For my next Blog entry I will discuss a little project Craig Boyd and I started on that will allow any VFP object (with a Picture property) to become a canvas object and have an associated Graphics object. There is a small sample posted on VPFX that demos this new functionality.

Thursday, August 16, 2007 3:32:21 AM (Eastern Daylight Time, UTC-04:00)

Comments [3]

Insert Images into an RTF control using GDIPlusX

The RichText control that ships with VFP is very useful for providing a formatted text edit box. While this control does support the displaying of images, there is nothing built in to the control that allows you to insert an image. I have included a function below that will allow you insert an image into the RichText control at the current cursor position.

Just specify the object reference to the RTF control and the fullpath of the image you want to insert. The image can be in any format supported by the GDIPlus library (BMP, JPEG, GIF, TIFF, EMF, PNG, etc...). You can also optionally specify the Width and Height you would like the image to be rendered.

This function requires the GDIPlusX library which can be downloaded from the VFPX project site: http://www.codeplex.com/VFPX/Wiki/View.aspx?title=GDIPlusX.

***********************************************************

* Function: InsertRTFImage

*

* Inserts an image into an RTF control at the current cusor position

*

* Parameters:

* toRTF - specifies an object reference to the RTF control

* tcImage - secifies the image to insert into the RTF

* tnWidth - Optional - Specifies the width to use for the image

* tnHeight - Optional - Specifies the height to use for the image

***********************************************************

FUNCTION InsertRTFImage(toRTF, tcImage, tnWidth, tnHeight)

LOCAL lcRTF, lcPict, lqData

LOCAL loImg AS xfcImage

LOCAL loGfx AS xfcGraphics

LOCAL loEMF AS xfcMetaFile

LOCAL lhDC, lhEMF, lnWMFLen

DECLARE Long GetDC IN WIN32API Long

DECLARE Long ReleaseDC IN WIN32API Long, Long

DECLARE Long DeleteEnhMetaFile IN WIN32API Long

DECLARE Long GdipEmfToWmfBits IN GDIPLUS.DLL ;

Long hemf, Long cbData16, String @pData16, ;

Integer iMapMode, Integer eFlags

** Make sure we have initialized the GDIPlusX library

** http://www.codeplex.com/VFPX/Wiki/View.aspx?title=GDIPlusX

IF VARTYPE(_SCREEN.System) <> "O"

ADDPROPERTY(_SCREEN,"System",NEWOBJECT("xfcSystem",LOCFILE("system.vcx")))

ENDIF

lcPict = ""

WITH _SCREEN.System.Drawing

loImg = .Image.FromFile(tcImage)

IF loImg.GetLastStatus() <> 0

ERROR "Could not open file: "+tcImage

ELSE

** If we didn't specify a width, use the image's width and height

IF EMPTY(tnWidth)

tnWidth = loImg.Width

tnHeight = loImg.Height

ENDIF

** Get the default screen HDC as a reference

lhDC = GetDC(0)

** Create a new metafile

loEMF = .Imaging.MetaFile.New(lhDC, ;

.Rectangle.New(0,0,tnWidth,tnHeight), ;

.Imaging.MetafileFrameUnit.Pixel, ;

.Imaging.MetafileType.Emf)

** We are done with the HDC reference, release it

ReleaseDC(lhDC, 0)

** Get a graphics context for the metafile so we can draw to it

loGfx = .Graphics.FromImage(loEMF)

loGFX.SmoothingMode = .Drawing2D.SmoothingMode.HighQuality

loGFX.InterpolationMode = .Drawing2D.InterpolationMode.HighQualityBicubic

** Draw the image

loGfx.DrawImage(loImg, 0, 0, tnWidth, tnHeight)

loGfx = NULL

** Convert the Metafile to a "Windows Metafile".

** This is the best format for the RTF control.

lhEMF = loEMF.GetHenhmetafile()

lnWMFLen = GdipEmfToWmfBits(lhEMF, 0, NULL, 2, 0)

lqData = REPLICATE(0h00,lnWMFLen)

GdipEmfToWmfBits(lhEMF, lnWMFLen, @lqData, 2, 0)

DeleteEnhMetaFile(lhemf)

loImg = NULL

** This is the RTF tags for the image

lcPict = [{\pict\wmetafile8]+;

[\picwgoal]+ALLTRIM(STR(tnWidth*15))+;

[\pichgoal]+ALLTRIM(STR(tnHeight*15))+;

CHR(13)+CHR(10)+;

STRCONV(lqData, 15)+;

CHR(13)+CHR(10)+[}]

ENDIF

ENDWITH

** Stuff the image into the RTF control

toRTF.SelRTF = [{\rtf1\ansi\ansicpg1252\deff0\deflang1033\uc1 ]+lcPict+[}]

RETURN

ENDFUNC

You can also download a sample program using this function here: RTFInsertImage.zip (2.19 KB)

Bo Durban

Keywords: RichText RTF FoxPro VFP GDIPlus GDIPlusX Image

Sunday, June 17, 2007 10:11:49 PM (Eastern Daylight Time, UTC-04:00)

Comments [2] VFP Development

HTML Tables and Styles

Have you ever tried to add borders to individual cells in an HTML table using style sheets? Something similar to <table border="1"> only done with CSS.

I had a requirement to put a 1 pixel black border between all cells in an HTML table. I wanted to do this without having to put a style or class attribute into every cell in the table. I thought: "How hard can this be?". There has to be a way of doing this with a single style attribute.

But after a quick search on the web with too many non-relevant results, (I mean what can you search for that doesn't bring back over a million hits). I decided to come up with my own technique:

table.border tr td,
table.border tr th {border:1px solid black;}

table.border {border-collapse:collapse;}

</style>

<tr>

<th>Header 1</th>

<th>Header 2</th>

<th>Header 3</th>

<th>Header 4</th>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

Yields the following output:

Header 1 Header 2 Header 3 Header 4

Data 1 Data 2 Data 3 Data 4

Data 1 Data 2 Data 3 Data 4

Header 1	Header 2	Header 3	Header 4
Data 1	Data 2	Data 3	Data 4
Data 1	Data 2	Data 3	Data 4

Is there a better way of doing this?

Bo Durban

Wednesday, June 13, 2007 2:13:21 PM (Eastern Daylight Time, UTC-04:00)

Comments [2] Web Development

I have entered the world of blogging

After much prodding, mostly by Craig Boyd, I have finally set up a blog. I plan to post some of my daily ramblings here under the Moxie Data banner.

I’m using the dasBlog based on Craig’s recommendation. It was fairly easy to set up and customize. So far, so good.

Tomorrow I will post something a little more technical, but for now I want to encourage anyone who has not signed up for a conference yet this year, to do so. The quality of session topics is better than ever plus there are several new speakers bringing in some fresh ideas.

I will be speaking at the FoxForward conference in Alpharetta, GA on September 7th-9th, 2007. It is super convenient for me (about 30 miles away) and only a few miles north of downtown Atlanta. Kevin Cully did a great job putting this conference together last year. His first ever. So I look "forward" to what he has in store for this year.

I will also be at the Southwest Fox conference in Mesa, AZ on October 18th-21st, 2007. I will hopefully be doing a vendor session to show off some of the new reporting enhancements in Sedna and how we are leveraging them in our Moxie Objects 2.0 product. I have attended SWFox for the past 2 years and have always had a great time. If you are going, I recommend you plan an extra day to take in the sites in and around Phoenix.

Anyway, thanks for stopping by. Check back soon. Over the next few days I will be posting some examples using the GDIPlusX library, part of the VFPX project on Codeplex. I have a long way to go to catch up to the number of great articles and blog entries potsed by Cesar Chalom.

Bo Durban

Tuesday, June 12, 2007 3:51:47 PM (Eastern Daylight Time, UTC-04:00)

Comments [4] General