Add some figures.

master
Karchnu 2022-01-21 17:30:57 +01:00
parent 2a2b5a26c4
commit 2eae61645c
1 changed files with 135 additions and 0 deletions

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@ -262,9 +262,144 @@ This is written in the code this way:
.PE .PE
.METAINFO2 .METAINFO2
.SECTION_NO_NUMBER Read the source code for the next figures.
Both figures have very few lines of code.
The source code can be read without prior knowledge of
.B pic ,
it's almost plain English!
.PS
reset
.\" Radius for different circles.
rad_large_circle = 0.6
rad_empty_space = 0.5
rad_light_source = 0.3
rad_aperture = 0.1
.\" Light intensity.
fill_large_circle = 0.1 # Very bright.
fill_empty_space = 0.6 # Little bright.
fill_light_source = 0 # Completely bright.
arrow_x_shift = 0.05
txt_y_shift = 0.25 # Allow space for text.
.\" Circles.
HALO: circle rad rad_large_circle fill fill_large_circle
EMPTY: circle with .c at HALO.c rad rad_empty_space fill fill_empty_space
SOURCE: circle with .c at HALO.c rad rad_light_source fill fill_light_source
APERTURE: circle with .c at HALO.c rad rad_aperture fill fill_light_source dashed
.\" Legend.
TAPERTURE: "Aperture, where light can pass through" ljust at HALO.e + (0.3, 0)
TSOURCE: "Main visible light source, very bright" ljust at Here + (0, -txt_y_shift)
TEMPTY: "Empty space, very little light" ljust at Here + (0, -txt_y_shift)
THALO: "Halo, thin light" ljust at Here + (0, -txt_y_shift)
.\" Arrows.
arrow from TAPERTURE + (-arrow_x_shift,0) to APERTURE chop 0 chop rad_aperture
arrow from TSOURCE + (-arrow_x_shift,0) to SOURCE chop 0 chop rad_light_source
arrow from TEMPTY + (-arrow_x_shift,0) to EMPTY chop 0 chop rad_empty_space
arrow from THALO + (-arrow_x_shift,0) to HALO chop 0 chop rad_large_circle
.\" Let's cheat a little: centering the figure.
false_line_x = 2.7
line from SOURCE + (false_line_x,0) to SOURCE + (false_line_x,0)
.ps 14
"Circular diffraction" at HALO.s + (1, -1)
.PE
Seriously, just check the source code.
It's filled with dead simple lines, such as:
.SOURCE C ps=7 vs=9p
circle rad rad_large_circle fill fill_large_circle
.SOURCE
.gcolor black
.PS
.vs 9p
.ps 7
reset
.\" Drawing direction.
down
scale = 1.4
.\""""""""""""""""""""""""""""""
.\" Variables to ajust elements.
.\" Distances x and y between the massive object and magnified ones.
mag_obj_x = 1.4
mag_obj_y = -1
.\" Radius of the different celestial objects.
rad_obs = 0.3
rad_massive_obj = 0.5
rad_mag = 0.4
rad_dist = 0.27
.\" Distance between the light beam of the distant object
.\" reaching the observer and the massive object's center.
dist_beam_massive_obj = 0.32
.\"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
.\" Drawing of the celestial corpses (planets, galaxies, etc.).
.\" Observer, massive object and the distant object.
OBSERVER: circle radius rad_obs "Observer"
move
MASSIVE_OBJ: circle radius rad_massive_obj "Massive" "object"
move
TARGET: circle radius rad_dist "Distant" "object"
.\" "radius" can be abreviated in "rad".
.\" Magnified objects.
MAGNIFIED1: circle rad rad_mag "Magnified" "distant" "object" at MASSIVE_OBJ + ( mag_obj_x, mag_obj_y)
MAGNIFIED2: circle rad rad_mag "Magnified" "distant" "object" at MASSIVE_OBJ + (-mag_obj_x, mag_obj_y)
.\" Lines from the magnified objects to the observer.
.\" chop = do not draw within the circles (a radius is given).
line from MAGNIFIED1 to OBSERVER chop rad_mag chop rad_obs dashed
line from MAGNIFIED2 to OBSERVER chop rad_mag chop rad_obs dashed
.\" Arrows, from distant object to the observer.
spline -> from TARGET to MASSIVE_OBJ.e + (dist_beam_massive_obj,0) to OBSERVER chop rad_dist chop rad_obs
spline -> from TARGET to MASSIVE_OBJ.w + (-dist_beam_massive_obj,0) to OBSERVER chop rad_dist chop rad_obs
.vs
.ps 14
"Gravitational lensing" at TARGET + (0,-0.7)
.PE
Both figures came from my summary of the book
.B "A Universe From Nothing" "\*[*]"
from
.I "Lawrence Krauss" .
.FOOTNOTE1
.\" I've no idea why footnotes line length changed.
.\" This is related to figures, but it needs some investigation.
.ll 7.5i
Available at:
.br
.ps 7.8
.ft CW
\*[WEBSITE]/universe-from-nothing.pdf
.ft
.ps
.FOOTNOTE2
.NH .NH
Some graphs with grap. Some graphs with grap.
.LP .LP
.PS
reset
.PE
.G1 .G1
GROWTHFACTOR=0.07 GROWTHFACTOR=0.07
grid bot dotted from 0 to 100 by 10 grid bot dotted from 0 to 100 by 10