Get the matrix of global position for each character of text

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I need to get the position and orientation of the first and the last character in a text frame art, in other words, I need its matrix.

There are a number of functions of the API that is supposed to help you; An excerpt from the ATESuites.h file

/ * Return of this race transformation matrix.

The returned array spesify transformation complete the given execution.  You must transform the original by IGlyphRun::GetOrigins() and

Concat with ITextFrame::GetMatrix() in order to get the location of the glyphs.

*/

ATEErr (* GetMatrix) (GlyphRunRef glyphrun, ASRealMatrix * ret);

Therefore, get the matrix of the first character or glyph should look like this:

AIErr

VMGetFirstTextMatrix (AIArtHandle textArt, AIRealMatrix * matrix)

{

ASRealMatrix frameMatrix, glyphMatrix;

ASRealPoint firstPoint;

Try

{

TextFrameRef ateTextRef;

sAITextFrame-> GetATETextFrame (textArt, & ateTextRef);

TextFrame ITextFrame (ateTextRef);

ITextLinesIterator lnItr = textFrame.GetTextLinesIterator ();

TxtLine = lnItr.Item () ITextLine;

IGlyphRunsIterator grItr = txtLine.GetGlyphRunsIterator ();

GlyphRun IGlyphRun = grItr.Item ();

IArrayRealPoint pointArray = glyphRun.GetOrigins ();

firstPoint = pointArray.Item (0);   dating bad values!

frameMatrix = textFrame.GetMatrix ();

glyphMatrix = glyphRun.GetMatrix ();

Scissor-> AIRealMatrixConcatTranslate (& glyphMatrix,

(firstPoint.h, firstPoint.v);

Scissor-> AIRealMatrixConcat ((AIRealMatrix *) & glyphMatrix,)

(AIRealMatrix *) & frameMatrix,.

matrix);

return kNoErr.

}

catch (ATE::Exception e)

{

return e.error;

}

return kNoErr.

}

But the coordinates is returned in frameMatrix (tx and ty) or the firstPoint are clearly wrong. It seems they have a lag that is allmost constant.  The values of x are about 7664 too great points (give and take a few decimals), and values are about 7893 too large (also give and take a few decimals).

I'm puzzled by this, reall because I need to get precise positions...

Well, it worked eventually.

The ITextFrame::GetMatrix() method generally returns an identity matrix, unless I moved or transformed the object frame of text on the artboard.  For example, if I duplicated a text image object by dragging the object while pressing the alt key, this matrix will be transformation relative to the object that it was created. Since it is a relative transformation, it is not hard or soft coordinates, so it is foolish to harden or soften (in fact, you shouldn't do).

Then the IGlyphRun::GetMatrix() method typically returns the identity matrix, but will contain a rotation for example, if the object is a text on a path.

Finally, the IGlyphRun::GetOrigins() method returns hard coordinates for each glyph, but without the frame matrix transformation.  This method is insensitive to the GetCoordinateSystem / SetCoordinateSystem functions of the following system and returns the hard coordinates launch.

Thus, in order to get the actual art contact information for the Board of Directors of a glyph, the following code will do:

    IArrayRealPoint pointArray = glyphRun.GetOrigins();

    AIRealPoint firstPoint = pointArray.Item(0);

    AIRealMatrix frameMatrix = textFrame.GetMatrix();

    sMath->AIRealMatrixXformPoint( &frameMatrix, &firstPoint, &hardPoint);

    sHardSoft->AIRealPointSoften( &hardPoint, &glyphPoint);

In order to obtain the matrix of the absolute position of the first glyph of an art of text frame, the following function seems to work:

AIErr

GetFirstTextMatrix(  AIArtHandle textArt, AIRealMatrix *matrix)

{

    ASRealMatrix frameMatrix, glyphMatrix;

    ASRealPoint firstPoint, softPoint, hardPoint;

    try

    {

        TextFrameRef ateTextRef;

        sAITextFrame->GetATETextFrame( textArt, &ateTextRef);

        ITextFrame textFrame( ateTextRef);

 

        ITextLinesIterator lnItr = textFrame.GetTextLinesIterator();

        ITextLine txtLine = lnItr.Item();   

 

        IGlyphRunsIterator grItr = txtLine.GetGlyphRunsIterator();

        IGlyphRun glyphRun = grItr.Item();

 

        IArrayRealPoint pointArray = glyphRun.GetOrigins();

        firstPoint = pointArray.Item(0);

        sHardSoft->AIRealPointSoften( &firstPoint, &softPoint);

 

        frameMatrix = textFrame.GetMatrix();

        glyphMatrix = glyphRun.GetMatrix();

 

        sMath->AIRealMatrixXformPoint( &frameMatrix, &firstPoint, &hardPoint);

        sHardSoft->AIRealPointSoften( &hardPoint, &softPoint);

 

        sMath->AIRealMatrixConcat( (AIRealMatrix*) &glyphMatrix,

                  (AIRealMatrix*) &frameMatrix,

                  matrix);

 

        matrix->tx = softPoint.h;

        matrix->ty = softPoint.v;

 

        return kNoErr; 

    }

    catch (ATE::Exception e)

    {

        return e.error;

    }

}

But, this has not come easily, and I must be allowed to blame poor documentation on this subject...

Agnar

Tags: Illustrator

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