how to implement smallcaps in itextsharp

问题

In one PDf i got small caps text the font size is 0.0. i have extracted font

using:------  

iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(curBaseline[Vector.I1], curBaseline[Vector.I2], topRight[Vector.I1], topRight[Vector.I2]);
Single curFontSize = rect.Height;

int this code curfontsize i got 0.0. but i was able to extract font family.but not able to extract fontsize. so the text was not displaying.can anyone provide solution for this . Is there anyother method.?

thankyou

回答1:

I just tried to reproduce your rec.Height == 0.0 issue in

iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(curBaseline[Vector.I1],
    curBaseline[Vector.I2], topRight[Vector.I1], topRight[Vector.I2]);
Single curFontSize = rect.Height

Doing so I assumed you chose curBaseline to mean the start point of the base line and topRight to mean the end point of the ascent line. My result (outputting both width and height of that Rectangle rect and the text respectively for each TextRenderInfo object received by my RenderListener):

[140,29,   6,66] "nagement en beleid. Via omscholing ("
[ 11,87,   5,00] "PDB"
[  4,95,   6,66] ", "
[  9,36,   5,00] "MB"
[  4,37,   5,00] "A"
[ 26,76,   6,66] ", deels "
[ 11,28,   5,00] "SPD"
[  5,82,   6,66] ") "
[ 88,66,   6,66] "ben ik in het financiële v"

So I did not get a height of 0.0 but instead of 5.00 for "PDB", "MB", "A", and "SPD".

This result is produced using a fairly current iText version. Thus, you might want to update your library as a first measure. If that does not help, you may want to reveal your source code to review here.

EDIT

As discussed in the comments here I extended the test class to extract the actual font sizes (both the size of the Tf operand and the size after applying the current transformation and text matrices). The result:

[140,29,   6,66,   8,50] "nagement en beleid. Via omscholing (" ([, , , AAHACD+SlimbachStd-Book] at   1,00)
[ 11,87,   5,00,   6,38] "PDB" ([, , , AAGNLJ+SlimbachStd-Book-SC750] at   1,00)
[  4,95,   6,66,   8,50] ", " ([, , , AAGNLJ+SlimbachStd-Book-SC750] at   1,00)
[  9,36,   5,00,   6,38] "MB" ([, , , AAGNLJ+SlimbachStd-Book-SC750] at   1,00)
[  4,37,   5,00,   6,38] "A" ([, , , AAGNLJ+SlimbachStd-Book-SC750] at   1,00)
[ 26,76,   6,66,   8,50] ", deels " ([, , , AAHACD+SlimbachStd-Book] at   1,00)
[ 11,28,   5,00,   6,38] "SPD" ([, , , AAGNLJ+SlimbachStd-Book-SC750] at   1,00)
[  5,82,   6,66,   8,50] ") " ([, , , AAHACD+SlimbachStd-Book] at   1,00)
[ 88,66,   6,66,   8,50] "ben ik in het financiële v" ([, , , AAHACD+SlimbachStd-Book] at   1,00)

As you can see, the Tf font size is always 1.0 and the effective font size (after scaling) of your small caps is 6.38.

As I am mostly working with iText (not iTextSharp), I've done the necessary reflection and introspection stuff in Java, too. This is the code of the RenderText implementation I used:

public void renderText(TextRenderInfo renderInfo)
{
    LineSegment curBaseline = renderInfo.getBaseline();
    LineSegment curAscentline = renderInfo.getAscentLine();
    Rectangle rect = new Rectangle(curBaseline.getStartPoint().get(Vector.I1),
            curBaseline.getStartPoint().get(Vector.I2),
            curAscentline.getEndPoint().get(Vector.I1),
            curAscentline.getEndPoint().get(Vector.I2));

    try {
        System.out.printf("  [%6.2f, %6.2f, %6.2f] \"%s\" (%s at %6.2f)\n",
                rect.getWidth(), rect.getHeight(),
                getEffectiveFontSize(renderInfo),
                renderInfo.getText(),
                Arrays.asList(renderInfo.getFont().getFullFontName()[0]),
                getFontSize(renderInfo));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

float getEffectiveFontSize(TextRenderInfo renderInfo)
        throws IllegalArgumentException, SecurityException,
            IllegalAccessException, InvocationTargetException,
            NoSuchFieldException, NoSuchMethodException
{
    Method convertHeight = TextRenderInfo.class.getDeclaredMethod("convertHeightFromTextSpaceToUserSpace", Float.TYPE);
    convertHeight.setAccessible(true);
    return (Float)convertHeight.invoke(renderInfo, getFontSize(renderInfo));
}

float getFontSize(TextRenderInfo renderInfo)
        throws SecurityException, NoSuchFieldException,
            IllegalArgumentException, IllegalAccessException
{
    Field gsField = TextRenderInfo.class.getDeclaredField("gs");
    gsField.setAccessible(true);
    GraphicsState gs = (GraphicsState) gsField.get(renderInfo);
    return gs.getFontSize();
}

The analogous trick should be possible with .Net introspection and reflection mechanisms.

来源：https://stackoverflow.com/questions/15739221/how-to-implement-smallcaps-in-itextsharp

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