World: r3wp

graham, did you figure out how to use the parallel port and was that 
for printing?

Graham: yes, and data is parsed from the Adobe Font Metrics file 
and included in pdf-maker.r for the 14 standard postscript fonts.

Henrik, my latest demo has a button that prints to the parallel port. 
 As for choosing trays and paper size, I think you can set that in 
the postscript comments.

Gabriele, do you have a reference on how to use this font metric 
data ?

is there a method to center text?

I used a ruler :)

darn it

Ok, let's be serious

hmm... at least measure the size of the text

You can determine the size of the text based on the current point 
size

and you know the page size

so, you can center it in draw.

hmm... that would give me the height of the text, but not the width

isn't there a textinfo thing that tells you the width of text?

there is also a stringwidth command in postscript.

so, my approach would be to create a center dialect word, and have 
a postscript implementation and a draw implementation

textinfo doesn't seem to work inside draw

presumably you can use it in vid and use those values.

fair enough?

quite a detour...

but OK, I only need to calculate it for two lines of text right now

>> layout [ a: text "this is a line" font [ size: 20 ]]
>> line-list: make system/view/line-info []
>> textinfo a line-list 0
>> probe line-list
make object! [
    start: "this is a line"
    num-chars: 14
    offset: 2x2
    size: 104x23
]
>> layout [ a: text "this is a line" font [ size: 12 ]]
>> textinfo a line-list 0
>> probe line-list
make object! [
    start: "this is a line"
    num-chars: 14
    offset: 2x2
    size: 68x15
]

could be possible to simplify that...

isn't there a SIZE-TEXT function?

dunno

still needs a face

>> size-text make face [text: "hello"]
== 29x15

easier :)

throw in a font definition

example?

well, just the one used in DRAW for the text that needs to be printed

center: func [text width font] [
  width / 2 - second size-text make face compose [
    text: (text)
    font: (font)
  ]
]

that's what it takes

but it only works sometimes.. I don't know why

copy

found the bug

compose copy [ ]

size-text is the limit of the size of the face as well

oh ..

center: func [text width font] [
  (width / 2) - (first size-text make face compose copy [
    text: (text)
    font: (font)
    size: (as-pair width 100)
  ])
]

hmm... maybe a different one is better...

center: func [text size font] [
  (size/x / 2) - (first size-text make face compose copy [
    text: (text)
    font: (font)
    size: (size)
  ])
]

center: func [text size font] [
  divide subtract size/x first size-text make face compose copy [
    text: (text)
    font: (font)
    size: (size)
  ] 2
]

getting better :-)

offsets a few pixels to the left, but it seems to center the text

the offset gets bigger when using a larger font.. wonder what causes 
it

anyhoo:


img: draw make image! 297x210 compose [pen red font (make face/font 
[size: 30]) text (as-pair center "BOOM!" 297x210 make face/font [size: 
30] 20) "BOOM!"]
view layout [image img]

I hope this can be done a little prettier...

http://www.hmkdesign.dk/run14.png<--- the offset can be seen at 
the bottom. I haven't tested, but maybe the kerning between the VID 
and DRAW font rendering isn't the same.

That looks like a nice little application! :-) Nice!