[Tutor] Canvas rectangle filling
Suresh Kumar
Suresh Kumar" <suresh_vsamy@rediffmail.com
Wed Jun 18 17:42:02 2003
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Thanks Daniel,=0A Thanks for your timely help. I got it. I created a "x=
mb" file and filled my rectangle. Still i have some problem that i would li=
ke to bring your attention. =0A =0A i have created a stack of rec=
tangles all of same size, say 200 pixel wide and 100 pixel height. Each rec=
tangle is given some color and stipple to "gray75". Then i placed some saml=
l rectangles of some size, say 50 pixel wide and 50 pixel height , on each =
bigger rectangle and assigened some color and stipple to "lines.xbm". I got=
the o/p such that the smaller rectangles are filled with "line.xbm". But t=
he samller rectangles are looking so transparent. It means, all areas other=
than ocupied by "line.xbm" is filled with bigger rectangle'c color. My req=
uirement is, all smaller rectangles should be filled with "lines.xbm" and t=
hey should not be transparent. =0A=0A My coding is as follows:=0A =0Ase=
lf.canvas.create_rectangle ( 100,100,200,200, fill=3D'blue', stipple=3D'gra=
y75)=0Aself.canvas.create_rectangle( 100,200,200,300,fill=3D'red', stipple=
=3D"gray50")=0Aself.canvas.create_rectangle((100,300,200,400, fill=3D'black=
', stipple=3D"gray25")=0A######### Small rectagnles=0Aself.canvas.create_re=
ctangle(100,150,150,200, fill=3D'black', stipple=3D"@line.xbm")=0Aself.canv=
as.create_rectangle(100,250,150,300, fill=3D'black', stipple=3D"@line.xbm")=
=0A=0A I attached my required o/p in this mail as "sample.gif". Have a =
=0Alook and give me your suggestion and me let me how to avoid transparanc=
y.=0A=0AWith regeards,=0AV.Suresh Kumar.=0A =0A=0A=0AOn Thu, 12 Jun 2003 A=
bel Daniel wrote :=0A>Suresh Kumar wrote:=0A> > Hi,=0A> > Iam using python=
/tkinter/pmw in windows.=0A> > Most of graphics languages provides facility=
to fill the rectangcle with=0A> > horizantal/vertical lines. I know that i=
n tkinter we can fill the canvas=0A> > rectangle's interior using "stipple"=
. But my customer is expecting the=0A> > rectangles to be filled with diag=
nal/vertical/horizantal lines. Is=0A> > there any direct way is available i=
n tkinter/Pmw to fill the rectangle with=0A> > lines?=0A> > or i have to us=
e "create_line" command explicitly?=0A>Well, creating the lines invidually =
is an option, but i think it's a=0A>rather poor one. You would have to figu=
re out the endpoints of each=0A>line, which might work for rectangles, but =
will get almost impossible=0A>for circles, or arcs.=0A>(Not to mention that=
you would be creating a lot of lines, which i guess=0A>would impact perfor=
mance.)=0A>=0A>I think the best idea would be to use stipple with custom bi=
tmaps. For=0A>example the following xbm file will create diagonal lines:=0A=
>----8<----=0A>/* Created with The GIMP */=0A>#define lines_width 16=0A>#de=
fine lines_height 16=0A>static unsigned char lines_bits[] =3D {=0A> 0x11=
, 0x11, 0x22, 0x22, 0x44, 0x44, 0x88, 0x88, 0x11, 0x11, 0x22, 0x22,=0A> =
0x44, 0x44, 0x88, 0x88, 0x11, 0x11, 0x22, 0x22, 0x44, 0x44, 0x88, 0x88,=0A>=
0x11, 0x11, 0x22, 0x22, 0x44, 0x44, 0x88, 0x88 };=0A>----8<-----=0A>Cop=
y-paste this into a file, call it 'lines.xbm', and use it like:=0A>canvas.c=
reate_rectangle(100,100,150,150, stipple=3D'@lines.xbm', fill=3D'black')=0A=
>=0A>There might be two problems:=0A>1) path to the xbm files. If you put y=
our xbm files somewhere else than=0A>the current directory, I think you wil=
l have to use the full path, like:=0A>... stipple=3D'@/path/to/file.xbm' ..=
.=0A>Which might complicate the matters as you have to keep track of where=
=0A>your xbm files are, and use the appropriate path.=0A>=0A>2) creating th=
e xbm files themselves. If you only need some options like=0A>'diagonal lin=
es, close the each other' or 'vertical lines, far apart'=0A>you could creat=
e some xbm files, and only provide those. (Essentially=0A>hardcoding thos p=
atterns.) If you need more flexibility, like 'lines at=0A>60 degrees angle,=
2 pixels wide and 7 pixels apart' you will have to=0A>generate xbm files o=
n the fly. A way of pipeing the xbm data would come=0A>handy in this case, =
but I don't know if such exists. You might have to=0A>save the generated xb=
m data to be able to pass the filename to tkinter.=0A>I think generating th=
e xbm files on the fly will be pretty easy, as they=0A>are simply black&whi=
te bitmaps.=0A>=0A>According to=0A>http://www.pythonware.com/library/tkinte=
r/introduction/x2861-options.htm=0A>which is describing the options of arc =
object:=0A>"As of Tk 8.0p2, the stipple option is ignored on the Windows pl=
atform.=0A>To draw stippled pieslices or chords, you have to create corresp=
onding=0A>polygons."=0A>=0A>But I think that doesn't affect other objects. =
(I didn't test on Windows)=0A>=0A>Abel Daniel=0A>=0A>______________________=
_________________________=0A>Tutor maillist - Tutor@python.org=0A>http://=
mail.python.org/mailman/listinfo/tutor=0A
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