Advice on Error Message - Invalid Graphics Mode

[Klaus]

I'm using PHP's interface to access the Haru library...

http://us3.php.net/manual/en/book.haru.php

I keep getting an "Invalid Graphics Mode" during testing when I switch
from outputting lines and curves to outputting text. I build a sample
manually and now error gets thrown. As soon as I try to put something
a bit more complex and organized together by using functions and
objects, I run into this wall.

Here's the real-life example to make this more interesting...

I'm building an application that will build plans according to spec,
basically a lot of line drawing.

So far so good.

Then I started work on an object to create a set of braces in an
alternate color and pattern, to indicate measurement. The braces
SHOULD have a text label at the pointy end with a number and unit of
measure.

When I build this on one page by tweaking one of the samples available
online, no problem. As soon as I move code into functions (haven't
event touched objects yet), I run into this roadblock of libHaru
throwing "Invalid Graphics Mode" errors.

Hopefully it's just some oversite on my part and not an issue with the
PHP interface.

Thanks,
Klaus

[Antony Dovgal]

On 29.11.2008 08:15, Klaus wrote:
> I'm using PHP's interface to access the Haru library...
>
> http://us3.php.net/manual/en/book.haru.php
>
> I keep getting an "Invalid Graphics Mode" during testing when I switch
> from outputting lines and curves to outputting text. I build a sample
> manually and now error gets thrown. As soon as I try to put something
> a bit more complex and organized together by using functions and
> objects, I run into this wall.

> Hopefully it's just some oversite on my part and not an issue with the
> PHP interface.

I need something more informative than just an error message and a description of your actions.
A short reproduce script would be best.

--
Wbr,
Antony Dovgal

[David Alberto]

I'm having a similar issue to the one Klaus had. I'm trying to create a pdf that has a logo image and some information below. The code below raises a HaruException. I just started working with the Haru library and I'm fairly new to PHP overall so I have no idea what this means or how to fix it.

$doc = new HaruDoc();
$page = $doc->addpage();
$page -> setSize(HaruPage::SIZE_LEGAL, HaruPage::PORTRAIT);
$page->setTextRenderingMode(HaruPage::FILL_THEN_STROKE); /* fill and stroke text */


//Instantiate HaruImage object
//Add image to pdf
$logoImage = $doc->loadJPEG('C:\wamp\www\public_html\logos\\'.$dealerID.'_logo.jpg');
$imageSize = $logoImage->getSize();
$imageWidth = $imageSize['width'] * 0.2;
$imageHeight = $imageSize['height'] * 0.2;
$page->drawImage($logoImage, 81, 932, $imageWidth, $imageHeight);

//Add text
$courier = $doc->getFont("Courier-Bold");
$page->setFontAndSize($courier, 9.5);
$page->TextRect(61, 922, $imageWidth + 20, 850, $info, HaruPage::TALIGN_CENTER);

[Bill Horger]

The one thing I don't see is a generic test for what mode you are actually in. I don't use text rectangles, but I suspect that this may be the issue.

In my own library, I include these kinds of tests (C++) when I am getting ready to use a specific mode. I've highlighted the most important ones as BOLD.

Here, I'm getting ready to output a series of text lines:

    Page_Status = HPDF_Page_GetGMode(page);   
    // close out the line being drawn
    if(Page_Status == HPDF_GMODE_PATH_OBJECT)    HPDF_Page_Stroke (page);

    HPDF_Page_BeginText (page);

    HPDF_Page_SetFontAndSize (page, current_font, (HPDF_REAL)PDFGraph_ConvertUnits(height));
    HPDF_Page_SetRGBStroke(page, PDFGraph_EXTRACT_RED(TextColor), PDFGraph_EXTRACT_GREEN(TextColor),PDFGraph_EXTRACT_BLUE(TextColor));
    HPDF_Page_SetRGBFill(page,PDFGraph_EXTRACT_RED(TextColor), PDFGraph_EXTRACT_GREEN(TextColor),PDFGraph_EXTRACT_BLUE(TextColor));

Here, I'm getting ready to output a set of line drawing commands or shape drawing (like arcs):

    Page_Status = HPDF_Page_GetGMode(page);   
    if(Page_Status == HPDF_GMODE_PAGE_DESCRIPTION || Page_Status == HPDF_GMODE_TEXT_OBJECT)
    {
       HPDF_Page_SetRGBStroke(page,PDFGraph_EXTRACT_RED(LineColor),PDFGraph_EXTRACT_GREEN(LineColor),PDFGraph_EXTRACT_BLUE(LineColor));
       HPDF_Page_SetLineWidth (page,(HPDF_REAL)PDFLineWidth) != HPDF_OK)

// This function is required whenever the mode has changed

HPDF_Page_MoveTo(page,(HPDF_REAL)newx[0],(HPDF_REAL)newy[0]);
    }

For line drawing (using multiple LINETO calls, I close out the line with this function as I verify the status:

HPDF_Page_Stroke (page);

Sorry the formatting does not come through on e-mail very well! Hope this helps.

Bill

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[Darrell Ross]

You need to manage your GMODE. I can't seem to find the new help version of this page but it is has a helpful image: http://libharu.sourceforge.net/graphics.html#Graphics_mode_.

When you call a function like drawImage, it will set the GMODE to HPDF_GMODE_PATH_OBJECT. Prior to doing any text, you must set the GMODE to HPDF_GMODE_TEXT_OBJECT. You can do this very simply with the calls:

• HPDF_Page_BeginText() 
  
• HPDF_Page_EndText().
  

You will get fewer errors if you wrap all of your text output routines within these.

Similar to Bill, I also check for GMODE before trying to do stuff though with a bit of a different structure.

ErrorEnum PDFDocument::SetFontAndSize()
{
  HPDF_Page page = HPDF_GetCurrentPage(PDF);
  if(!page)
    return ERROR_PAGE_NOT_FOUND;

  if(HPDF_Page_GetGMode(page) != HPDF_GMODE_TEXT_OBJECT)
    return ERROR_INVALID_GMODE;

  HPDF_Font fontFace = GetFont();
  HPDF_Page_SetFontAndSize(page, fontFace, fontSizeDefault);
  return ERROR_NONE;
}