Centered text issue

yuvall31

Hi there,

I am using opensesame for a few month now, and recently i've noticed an issue with the centering of a text.

I wanted to create a circle with an asterisk inside of it. I gave the center of the circle and the center of the text the same values, but the asterisk wasn't centered.

Consider this code:

cv = Canvas()
cv.line(sx=-200, sy=0, ex=200, ey=0)
cv.line(sx=0, sy=-200, ex=0, ey=200)
cv.circle(x=0, y=0, r=40)
cv.text("*", x=0, y=0, center=True, font_size=70)
cv.show()

The image i received was this:

Then I thought to compare it to a long character. I tried this: '|'

cv = Canvas()
cv.line(sx=-200, sy=0, ex=200, ey=0)
cv.line(sx=0, sy=-200, ex=0, ey=200)
cv.circle(x=0, y=0, r=40)
cv.text("*|", x=0, y=0, center=True, font_size=70)
cv.show()

The image I received was this:

The '|' is actually centered, but why is the asterisk suddenly went up?

How can I create an actually centered asterisk inside a circle?

The code above was tested on:

• opensesame 3.2 with python 3 with expyriment backend. (The images was taken from here)
• opensesame 3.1 with python 2.7 with psycopy backend.

Thanks,

Yuval

sebastiaan

Hi Yuval,

This is a known issue with bounding boxes around text leading to sometimes unpredictable positioning. A workaround for that is described here:

• https://osdoc.cogsci.nl/3.2/manual/stimuli/text/#vertical-alignment

This should be fixed in OpenSesame 3.3. (However, the correct positioning for the asterisk will still be a bit above the center, not perfectly centered!)

Cheers!

Sebastiaan