DrawRect without fill?

BlitzMax Forums/BlitzMax Beginners Area/DrawRect without fill?

Steve Elliott

(Posted 2005) [#1]

We have DrawRect and DrawLine - but don't seem to have the flag for drawing an unfilled rectangle - or have I missed it?

ImaginaryHuman

(Posted 2005) [#2]

I don't /think/ it's there yet. It should be simple enough to do. I think actually perhaps they intend that you use drawline for a series of lines to make a box.

Steve Elliott

(Posted 2005) [#3]

Yes I've been drawing 4 lines - just thought there might be a rectangle flag - or Mark might add it seeing this post. ;)

altitudems

(Posted 2005) [#4]

Just use one of these:

glPolygonMode(GL_BACK, GL_LINE)  'Draw outline only
glPolygonMode(GL_BACK, GL_POINT) 'Draw dotted outline
glPolygonMode(GL_BACK, GL_FILL)  'Draw filled

P.S. This will apply to all Draw commands.

Steve Elliott

(Posted 2005) [#5]

Thanks - and I see you need GL_BACK (not GL_FRONT) to write to the backbuffer before flipping.

altitudems

(Posted 2005) [#6]

Oops, missed that :)

ImaginaryHuman

(Posted 2005) [#7]

glPolygonMode(GL_BACK, GL_LINE) ' outlined
DrawRect 10,10,10,10
glPolygonMode(GL_BACK, GL_FILL) ' solid filled (back to normal)

flying willy

(Posted 2005) [#8]

Why isn't this in the help files for rect?

tonyg

(Posted 2005) [#9]

Because it's a workaround not an official function.
It's mentioned in the wiki.

Steve Elliott

(Posted 2005) [#10]

Does anybody else get a missing pixel in the top right corner of the rectangle?

I would be tempted to put this in the bug report section but it's not an official function.

altitudems

(Posted 2005) [#11]

Does this maybe have something to do with the DrawRect command not drawing the last pixel? After the recent 1.03 update mark has added a "draw_last_pixel" flag to DrawLine.

Steve Elliott

(Posted 2005) [#12]

I'm sure it is - I guess Mark needs to add another flag. ;-)

PGF	(Posted 2005) [#13]

I tried the following but it didn't work.

glObscureDrawMode(GL_BACK, GL_DRAWEVERYSINGLEPIXELINARECTANGLEPLEASE)

Steve Elliott

(Posted 2005) [#14]

LOL - not too much to ask is it? ;-)

z80jim

(Posted 2005) [#15]

How to generate an unfilled circle? The glPolygonMode command doesn't seem to work for that.

Yan	(Posted 2005) [#16]

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)

RiK	(Posted 2005) [#17]

Why isn't this in the help files for rect?

Sadly the docs are still the weakest link in the BMax chain...