I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides?
polygon angle option perpendicular to axis
7 messages · Simon, Heather, Peter Alspach, Greg Snow +2 more
Tena koe Simon plot(1:10, 1:10, type='n') polygon(c(2,3,6,8), c(2,5,5,3), density=20, angle=90) polygon(c(2,3,6,8), 5+c(2,5,5,3), density=20, angle=0) I don't understand your problem. Perhaps if you "provide[d] commented, minimal, self-contained, reproducible code" it would help. HTH .... Peter Alspach -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Simon, Heather Sent: Thursday, 28 April 2016 8:17 a.m. To: r-help at r-project.org Subject: [R] polygon angle option perpendicular to axis I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides? ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. The contents of this e-mail are confidential and may be ...{{dropped:14}}
Thanks for the question. Here is a sample of the code for my plot:
Top = c(34, 39, 42, 45, 46, 41, 41, 40, 43, 38, 33, 33)
Bottom = c(24, 29, 32, 36, 32, 34, 32,41, 40, 39, 29, 24)
plot(1,1, col = "white", xlim = c(1.3,11.7), ylim = c(0,80), axis = FALSE, xaxt = "n")
axis(1, at = c(1:12))
polygon(c(c(1:12),c(12:1)), c(top, bottom), col = adjustcolor("#33a02c",alpha.f = 0.7) ,border = "#33a02c", lty = 4, density = 80, angle = 180)
I would like the hatched lines to all go in the same direction (parallel to the x-axis) so that I can layer another polygon on top with perpendicular hatches and you will be able to differentiate between the two.
-----Original Message-----
From: Peter Alspach [mailto:Peter.Alspach at plantandfood.co.nz]
Sent: Thursday, April 28, 2016 12:11 AM
To: Simon, Heather <Simon.Heather at epa.gov>; r-help at r-project.org
Subject: RE: polygon angle option perpendicular to axis
Tena koe Simon
plot(1:10, 1:10, type='n')
polygon(c(2,3,6,8), c(2,5,5,3), density=20, angle=90) polygon(c(2,3,6,8), 5+c(2,5,5,3), density=20, angle=0)
I don't understand your problem. Perhaps if you "provide[d] commented, minimal, self-contained, reproducible code" it would help.
HTH ....
Peter Alspach
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Simon, Heather
Sent: Thursday, 28 April 2016 8:17 a.m.
To: r-help at r-project.org
Subject: [R] polygon angle option perpendicular to axis
I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides?
______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
The contents of this e-mail are confidential and may be ...{{dropped:9}}
Filling polygons with lines is a throwback to the time when the height of quality graphics was the mechanical pen plotter (a device that used a pen in a mechanical arm to draw the plot on a piece of paper). Computing and printing technology has advanced quite a bit from that day, so you may want to reconsider why you want polygons filled with lines instead of just a solid color (and I consider white, grey, and black as colors for this purpose).
On Wed, Apr 27, 2016 at 2:17 PM, Simon, Heather <Simon.Heather at epa.gov> wrote:
I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides?
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______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Gregory (Greg) L. Snow Ph.D. 538280 at gmail.com
I think you are seeing the Moire (interference) pattern arising from the interaction of lty=4 (dotted/dashed lines) and closely spaced parallel lines. Use lty=1 (solid lines) to see this. [BTW, your script did not work because you changed the capitalization of top and bottom halfway through it.] As for hatching being old-fashioned, when I read stats stuff on my black and white Kindle I wish that people used color less and hatching more. Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, Apr 28, 2016 at 5:45 AM, Simon, Heather <Simon.Heather at epa.gov> wrote:
Thanks for the question. Here is a sample of the code for my plot:
Top = c(34, 39, 42, 45, 46, 41, 41, 40, 43, 38, 33, 33)
Bottom = c(24, 29, 32, 36, 32, 34, 32,41, 40, 39, 29, 24)
plot(1,1, col = "white", xlim = c(1.3,11.7), ylim = c(0,80), axis
= FALSE, xaxt = "n")
axis(1, at = c(1:12))
polygon(c(c(1:12),c(12:1)), c(top, bottom), col =
adjustcolor("#33a02c",alpha.f = 0.7) ,border = "#33a02c", lty = 4, density
= 80, angle = 180)
I would like the hatched lines to all go in the same direction (parallel
to the x-axis) so that I can layer another polygon on top with
perpendicular hatches and you will be able to differentiate between the two.
-----Original Message-----
From: Peter Alspach [mailto:Peter.Alspach at plantandfood.co.nz]
Sent: Thursday, April 28, 2016 12:11 AM
To: Simon, Heather <Simon.Heather at epa.gov>; r-help at r-project.org
Subject: RE: polygon angle option perpendicular to axis
Tena koe Simon
plot(1:10, 1:10, type='n')
polygon(c(2,3,6,8), c(2,5,5,3), density=20, angle=90) polygon(c(2,3,6,8),
5+c(2,5,5,3), density=20, angle=0)
I don't understand your problem. Perhaps if you "provide[d] commented,
minimal, self-contained, reproducible code" it would help.
HTH ....
Peter Alspach
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Simon,
Heather
Sent: Thursday, 28 April 2016 8:17 a.m.
To: r-help at r-project.org
Subject: [R] polygon angle option perpendicular to axis
I am trying to use the angle option in polygon to create polygons filled
with horizontal and vertical lines. The polygons I am crating are
irregular and it the angle function appears to set the angle of the shading
perpendicular to the polygon sides rather than perpendicular to the axes.
Is there any way to set the angle relative to the axes rather than relative
to the polygon sides?
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. The contents of this e-mail are confidential and may be ...{{dropped:9}} ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
The angle is not based on the polygon edges, but it can seem that way if you do not use the asp=1 argument in your plot. Try this example,
plot(1:10, 1:10, type='n') x <- c(1, 3, 5, 3) y <- c(3, 5, 3, 1) polygon(x, y, angle=0, density=10) polygon(x, y + 4.5, angle=45, density=10) polygon(x + 4.5, y + 4.5, angle=90, density=10) polygon(x + 4.5, y, angle=135, density=10)
Notice that the 45 and 135 degree lines (upper left and lower right) do not seem to be parallel to the edges of the boxes which should be 45 and 135. Run the code again adding asp=1 to the plot() function and now the lines are parallel. ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Greg Snow Sent: Thursday, April 28, 2016 9:50 AM To: Simon, Heather Cc: r-help at r-project.org Subject: Re: [R] polygon angle option perpendicular to axis Filling polygons with lines is a throwback to the time when the height of quality graphics was the mechanical pen plotter (a device that used a pen in a mechanical arm to draw the plot on a piece of paper). Computing and printing technology has advanced quite a bit from that day, so you may want to reconsider why you want polygons filled with lines instead of just a solid color (and I consider white, grey, and black as colors for this purpose).
On Wed, Apr 27, 2016 at 2:17 PM, Simon, Heather <Simon.Heather at epa.gov> wrote:
I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides?
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Gregory (Greg) L. Snow Ph.D. 538280 at gmail.com ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Thanks, adding asp = 1 did the trick! -----Original Message----- From: David L Carlson [mailto:dcarlson at tamu.edu] Sent: Thursday, April 28, 2016 12:17 PM To: Greg Snow <538280 at gmail.com>; Simon, Heather <Simon.Heather at epa.gov> Cc: r-help at r-project.org Subject: RE: [R] polygon angle option perpendicular to axis The angle is not based on the polygon edges, but it can seem that way if you do not use the asp=1 argument in your plot. Try this example,
plot(1:10, 1:10, type='n') x <- c(1, 3, 5, 3) y <- c(3, 5, 3, 1) polygon(x, y, angle=0, density=10) polygon(x, y + 4.5, angle=45, density=10) polygon(x + 4.5, y + 4.5, angle=90, density=10) polygon(x + 4.5, y, angle=135, density=10)
Notice that the 45 and 135 degree lines (upper left and lower right) do not seem to be parallel to the edges of the boxes which should be 45 and 135. Run the code again adding asp=1 to the plot() function and now the lines are parallel. ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Greg Snow Sent: Thursday, April 28, 2016 9:50 AM To: Simon, Heather Cc: r-help at r-project.org Subject: Re: [R] polygon angle option perpendicular to axis Filling polygons with lines is a throwback to the time when the height of quality graphics was the mechanical pen plotter (a device that used a pen in a mechanical arm to draw the plot on a piece of paper). Computing and printing technology has advanced quite a bit from that day, so you may want to reconsider why you want polygons filled with lines instead of just a solid color (and I consider white, grey, and black as colors for this purpose).
On Wed, Apr 27, 2016 at 2:17 PM, Simon, Heather <Simon.Heather at epa.gov> wrote:
I am trying to use the angle option in polygon to create polygons filled with horizontal and vertical lines. The polygons I am crating are irregular and it the angle function appears to set the angle of the shading perpendicular to the polygon sides rather than perpendicular to the axes. Is there any way to set the angle relative to the axes rather than relative to the polygon sides?
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
-- Gregory (Greg) L. Snow Ph.D. 538280 at gmail.com ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.