[reportlab-users] A Bug in TextObject.moveCursor?

Sun, 14 Mar 2004 14:44:55 -0000

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Hi All

I've got a strange problem with TextObject.moveCursor not working =
properly.

I'm outputting small blocks of text (lyrics - output a few words at a =
time)
interspersed by symbols (barlines).

To render my barline, I do this:

    (x, y) =3D to.getCursor() # Find where to draw the barline
    width =3D drawBarLine(c, x, y, type) # Draw it, and find its width
    to.moveCursor(x+width, 0) # Move the cursor along by the width

Now the first time this runs on a line, it is fine. The second time the
moveCursor adds extra space (a couple of cm), then an increasing amout =
of
extra space each time it runs on a line. On the next line, same story, =
runs
fine the first time, then adds space... and so on.

But strangely, if I do this:

    (x,y) =3D to.getCursor()
    to.textOut(text)
    (nx, ny) =3D to.getCursor()
    c.line(x,y,nx,ny)

every time I print any text (i.e. I'm underlining each bit of text), I
notice that the underlines are in the correct position, and they don't =
match
with the output text (which is further to the right). In otherwords
moveCursor is correctly moving the cursor, but incorrectly moving the =
text
output position!

Any advice, or shall I go digging in the code?

Ian.
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<META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR>
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<BODY bgColor=3D#ffffff>
<DIV>Hi All I've got a strange problem with TextObject.moveCursor =
not=20
working properly. I'm outputting small blocks of text (lyrics - =
output a=20
few words at a time) interspersed by symbols (barlines). To =
render my=20
barline, I do this: &nbsp;&nbsp;&nbsp; (x, y) =3D to.getCursor() =
# Find=20
where to draw the barline &nbsp;&nbsp;&nbsp; width =3D drawBarLine(c, =
x, y,=20
type) # Draw it, and find its width &nbsp;&nbsp;&nbsp; =
to.moveCursor(x+width,=20
0) # Move the cursor along by the width Now the first time this =
runs on a=20
line, it is fine. The second time the moveCursor adds extra space (a =
couple=20
of cm), then an increasing amout of extra space each time it runs on =
a line.=20
On the next line, same story, runs fine the first time, then adds =
space...=20
and so on. But strangely, if I do this: &nbsp;&nbsp;&nbsp; =
(x,y) =3D=20
to.getCursor() &nbsp;&nbsp;&nbsp; =
to.textOut(text) &nbsp;&nbsp;&nbsp; (nx,=20
ny) =3D to.getCursor() &nbsp;&nbsp;&nbsp; =
c.line(x,y,nx,ny) every time I=20
print any text (i.e. I'm underlining each bit of text), I notice that =
the=20
underlines are in the correct position, and they don't match with the =
output=20
text (which is further to the right). In otherwords moveCursor is =
correctly=20
moving the cursor, but incorrectly moving the text output=20
position! Any advice, or shall I go digging in the=20
code? Ian.</DIV></BODY></HTML>

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