More model railroading with Tcl R. Suchenwirth, Konstanz 2001-03-10
Description edit
Richard Suchenwirth - This weekend fun project varies the theme of
Model railroading with Tcl and takes a windshield perspective. Imagine you're standing at a railroad crossing, red lights are flashing... and then the train runs by - an armour yellow F7A, boxcars, gondola, trailer on flat car.. and finally, the caboose. That's what the following piece shows on a Tk canvas. You can control train speed with left (faster), middle (emergency stop), and right (slower, or back) mouse buttons.
In order to cope with the higher data complexity, some more structure and a
rr namespace were introduced. The API, so to speak, is simple:
rr::init $canvas ;# creates and packs a canvas, if not existing
rr::create $type $number [$otherdata] ;# make a vehicle (loco or car)
rr::train $number $consist ;# vehicles of which a train is made up
rr::run $trainnumber ;# guess what that does ;-)
See the demo at end for concrete examples.
See Also edit
- Arts and crafts of Tcl-Tk programming
PYK 2012-12-09: eliminated
update, data(speed) now affects
after rather than
[move
]# sep_rr.tcl
package require Tk
namespace eval rr {
variable data
set data(curx) 700
set data(y) 190
proc init w {
variable data
set data(c) $w
set data(speed) 6
if ![winfo exists $w] {
canvas $w -width 700 -height 220 -bg lightblue
pack $w -expand 1 -fill both
}
$w delete all
foreach i [after info] {after cancel $i}
bind . <Shift-1> [list source [info script]]
bind . <1> {incr [namespace current]::data(speed) 1}
bind . <2> {set [namespace current]::data(speed) 0}
bind . <3> {incr [namespace current]::data(speed) -1}
bind .c <Motion> {wm title . [.c canvasx %x],[expr [.c canvasy %y]-190]}
$w create poly 0 1000 0 77 42 67 99 130 155 73 199 102 255 83 312 126\
380 116 433 105 501 75 600 104 1200 100 1200 1000 -fill green3 -tag bg
$w create rect 0 191 7000 200 -fill brown -outline brown ;# ballast
$w create poly -500 720 100 130 700 720 -fill gray50 ;# road
$w create poly 80 720 100 130 120 720 -outline yellow -fill gray50
$w create line 0 190 7000 190 -fill gray -width 3 ;# rail
crossing 210 215
}
proc define {name def} {
variable data
set data($name) $def
}
proc create {type id args} {
variable data
set c $data(c)
set tag $type:$id
foreach i [split $data($type) \n] {
set cmd [lindex $i 0]
switch $cmd {
bogie {
set x [lindex $i 1]
set diameter 21
$c create oval $x -$diameter [expr $x+$diameter] 0\
-fill black -outline white -tag $tag
set x1 [expr $x+[lindex $i 2]]
$c create oval $x1 -$diameter [expr $x1+$diameter] 0\
-fill black -outline white -tag $tag
set m [expr {$x+($x1+$diameter-$x)/2}]
$c create rect [expr $m-10] -10 [expr $m+10] -30 -fill black -tag $tag
$c create rect [expr $x-5] [expr -$diameter/2-5]\
[expr $x1+$diameter+5] [expr -$diameter/2+5] -fill gray20 -tag $tag
}
gp38body {
set t [list gp38body $tag]
$c create rect 0 -28 430 -21 -fill black -tag $t
$c create rect 25 -28 70 -80 -fill red -tag $t ;#nose
$c create rect 70 -100 130 -28 -fill red -tag $t ;#cab
$c create rect 130 -100 410 -28 -fill red2 -tag $t ;#body
$c create poly 180 -102 264 -102 264 -102 244 -90 200 -90\
180 -102 -fill red -outline black -tag $t
$c create rect 54 -103 170 -93 -fill red -tag $t ;#cab roof
$c create line 290 -105 300 -105 -fill red -arrow both \
-arrowshape {-6 -5 3} -width 2 -tag $t ;# horns
$c create rect 190 -22 255 -6 -fill black -tag $t ;#tank
window $t 86 -90 26 18
$c create line 100 -90 100 -72 -tag $tag ;# window separator
$c create line 15 -8 15 -55 -fill white -width 2 -tag $tag
$c create line 35 -8 35 -60 45 -60 57 -70 72 -70 -tag $t
$c create line 128 -70 130 -70 140 -60 315 -60 320 -55 \
405 -55 405 -8 -tag "$t handrail"
for {set x 150} {$x<400} {incr x 45} {
$c create line $x -60 $x -20 -tag "$t handrail"
}
$c create line 425 -8 425 -55 -fill white -width 2 -tag $tag
for {set y -70} {$y<=-30} {incr y 10} {
$c create line 25 $y 30 [expr $y-8] -width 3 -fill white\
-tag $t
}
$c create text 100 -60 -text $id\
-font {Helvetica 11 {bold italic}} -fill white -tag $t
$c create text 225 -75 -text "CP Rail" \
-font {Helvetica 24 {bold italic}} -fill white -tag $t
$c create oval 350 -90 400 -40 -fill white -outline white -tag $t
$c create rect 375 -90 400 -40 -fill white -outline white -tag $t
$c create poly 375 -65 400 -40 400 -90 -fill black -tag $t
$c raise handrail
}
f7abody {
set t [list f7abody $tag]
$c create rect 0 -25 430 -22 -fill black -tag $tag
$c create rect 400 -30 430 -90 -fill black -tag $tag
$c create poly \
17 -9 30 -85 35 -88 58 -90 60 -92 67 -106 70 -108 73 -110 \
425 -110 425 -15 410 -15 400 -25 295 -25 290 -15 165 -15 \
160 -25 45 -25 35 -9 -fill gold -tag $t
$c create rect 30 -71 51 -59 -fill black -tag $t
$c create text 31 -71 -text $id -anchor nw -fill white -tag $t
$c create poly 67 -102 72 -101 76 -97 70 -87 62 -92 \
-fill white -outline black -tag $t
$c create poly 71 -81 80 -94 94 -94 94 -81 -fill white \
-outline black -tag $t
$c create rect 98 -97 114 -52 -outline gold3 -tag $t
$c create rect 101 -94 111 -81 -fill white -tag $t ;# cab door window
$c create rect 118 -97 420 -80 -outline gold3 \
-tag $t ;# cooler grill
for {set i 121} {$i<420} {incr i 3} {
$c create line $i -97 $i -80 -fill gold3 -tag $t
}
$c create rect 140 -110 424 -100 -fill gray75 \
-outline gray75 -tag $t;# roof
$c create line 100 -113 110 -113 -arrow both \
-arrowshape {-5 -5 3} -width 2 -tag $t ;# horns
$c create rect 103 -115 107 -110 -fill black -tag $t
$c create oval 150 -77 165 -62 -fill gray50 -tag $t
$c create oval 300 -77 315 -62 -fill gray50 -tag $t
$c create text 145 -56 -text "U N I O N P A C I F I C" -fill red \
-font {Helvetica 13 bold} -anchor nw -tag $t
$c create text 55 -56 -text $id -fill red -font {Helvetica 13 bold}\
-anchor nw -tag $t
$c create line 55 -37 423 -37 -fill red -width 3 -tag $t
}
f7bbody {
set t [list f7bbody $tag]
$c create rect 0 -25 430 -22 -fill black -tag $tag
$c create rect 0 -30 430 -90 -fill black -tag $tag
$c create poly 17 -110 \
425 -110 425 -15 410 -15 400 -25 295 -25 290 -15 165 -15 \
160 -25 45 -25 35 -15 17 -15 -fill gold -tag $t
$c create rect 22 -97 420 -80 -outline gold3 \
-tag $t ;# cooler grill
for {set i 25} {$i<420} {incr i 3} {
$c create line $i -97 $i -80 -fill gold3 -tag $t
}
$c create rect 18 -110 424 -100 -fill gray75 \
-outline gray75 -tag $t;# roof
$c create oval 150 -77 165 -62 -fill gray50 -tag $t
$c create oval 300 -77 315 -62 -fill gray50 -tag $t
$c create text 145 -56 -text "U N I O N P A C I F I C" -fill red \
-font {Helvetica 13 bold} -anchor nw -tag $t
$c create text 55 -56 -text $id -fill red -font {Helvetica 13 bold}\
-anchor nw -tag $t
$c create line 25 -37 423 -37 -fill red -width 3 -tag $t
}
boxcarbody {
$c create rect 0 -25 380 -22 -fill black -tag $tag
$c create rect 10 -26 370 -105 -fill [lindex $args 1] -tag $tag
set rgrey grey[expr round(rand()*40+50)]
$c create rect 10 -100 370 -105 -fill $rgrey -tag $tag
$c create rect 160 -95 220 -30 -tag $tag
$c create text 100 -70 -text [lindex $args 0] -fill white -tag $tag
$c create text 100 -50 -text $id -fill white -tag $tag
}
baggagebody {
$c create rect 0 -25 420 -22 -fill black -tag $tag
$c create rect 0 -30 420 -92 -fill black -tag $tag
$c create rect 5 -24 415 -100 -fill [lindex $args 1] -tag $tag
set rgrey grey[expr round(rand()*20+70)]
$c create rect 5 -90 415 -100 -fill $rgrey -tag $tag
$c create text 205 -83 -text [join [split [lindex $args 0] ""] " "]\
-fill red -font {Times 7 bold} -tag $tag
$c create text 71 -44 -text $id -tag $tag
door $tag 20 -78 20 50 15
$c create rect 190 -75 240 -30 -tag $tag
door $tag 380 -78 20 50 16
}
coachbody {
$c create rect 0 -25 420 -22 -fill black -tag $tag
$c create rect 0 -30 420 -90 -fill black -tag $tag
$c create rect 5 -23 415 -100 -fill [lindex $args 1] -tag $tag
set rgrey grey[expr round(rand()*20+70)]
$c create rect 5 -90 415 -100 -fill $rgrey -tag $tag
for {set y -50} {$y<=-30} {incr y 3} {
$c create line 11 $y 410 $y -fill white -tag $tag
}
$c create text 205 -83 -text [join [split [lindex $args 0] ""] " "]\
-fill red -font {Times 7 bold} -tag $tag
$c create text 71 -44 -text $id -tag $tag
door $tag 10 -75 20 50 15
window $tag 45 -72 21 16 12 7
door $tag 390 -75 20 50 16
}
ocoachbody {
$c create rect 0 -25 420 -22 -fill black -tag $tag
$c create rect 20 -23 400 -90 -fill [lindex $args 1] -tag $tag
set rgrey grey[expr round(rand()*20+40)]
$c create rect 5 -90 415 -95 -fill $rgrey -tag $tag
$c create poly 20 -95 40 -102 380 -102 400 -95 -fill grey\
-outline black -width 2 -tag $tag
for {set x 50} {$x<=370} {incr x 20} {
$c create line $x -95 $x -102 -width 2 -tag $tag
}
$c create line 5 -5 5 -90 -tag $tag
$c create line 415 -5 415 -90 -tag $tag
$c create line 20 -88 400 -88 -fill yellow -tag $tag
$c create text 205 -83 -text [join [split [lindex $args 0] ""] " "]\
-fill yellow -font {Times 7 bold} -tag $tag
$c create line 20 -78 400 -78 -fill yellow -tag $tag
$c create text 40 -40 -text $id -fill yellow -tag $tag
$c create text 380 -40 -text $id -fill yellow -tag $tag
window $tag 50 -72 15 22 16 5
$c create line 50 -65 350 -65 -tag $tag
$c create line 20 -27 400 -27 -fill yellow -tag $tag
}
domebody {
$c create rect 0 -25 420 -22 -fill black -tag $tag
$c create rect 0 -30 420 -90 -fill black -tag $tag
$c create rect 5 -24 415 -100 -fill [lindex $args 1] -tag $tag
set rgrey grey[expr round(rand()*20+70)]
$c create rect 5 -90 415 -100 -fill $rgrey -tag $tag
$c create poly 110 -92 100 -100 130 -120 300 -120 330 -100 320 -92 \
-fill lightcyan -outline black -tag $tag ;# dome
for {set x 130} {$x<=300} {incr x 34} {
$c create line $x -120 $x -90 -tag $tag
}
$c create line 123 -115 130 -110 300 -110 308 -118 -tag $tag
$c create text 210 -83 -text [join [split [lindex $args 0] ""] " "]\
-fill red -font {Times 7 bold} -tag $tag
for {set y -50} {$y<=-30} {incr y 3} {
$c create line 11 $y 410 $y -fill white -tag $tag
}
$c create text 71 -44 -text $id -tag $tag
door $tag 20 -75 20 50 15
window $tag 110 -60 25 15 6 10
door $tag 380 -75 20 50 16
}
caboosebody {
$c create rect 0 -25 300 -22 -fill black -tag $tag
$c create poly 35 -25 35 -100 120 -100 120 -130 190 -130\
190 -100 270 -100 270 -25\
-fill [lindex $args 1] -tag $tag
$c create line 10 -10 10 -100 -tag $tag
$c create line 290 -10 290 -100 -tag $tag
set rgrey grey[expr round(rand()*40+10)]
$c create rect 10 -100 120 -105 -fill $rgrey -tag $tag
$c create rect 115 -125 195 -130 -fill $rgrey -tag $tag
$c create rect 190 -100 290 -105 -fill $rgrey -tag $tag
$c create rect 210 -105 215 -130 -fill black -tag $tag
window $tag 130 -120 18 15 2 15
window $tag 50 -75 19 17 2 15
window $tag 200 -75 19 17 2 15
$c create text 150 -90 -text [lindex $args 0] -fill white -tag $tag
$c create text 150 -50 -text $id -fill white -tag $tag
$c create arc 40 -30 85 -85 -style arc -start 180 \
-extent 90 -outline yellow -width 1 -tag $tag
$c create arc 220 -30 265 -85 -style arc -start 270 \
-extent 90 -outline yellow -width 1 -tag $tag
}
flatcarbody {
$c create rect 0 -25 380 -22 -fill black -tag $tag
$c create rect 10 -26 370 -35 -fill [lindex $args 1] -tag $tag
$c create text 80 -29 -text [lindex $args 0] -fill white -tag $tag
$c create text 220 -29 -text $id -fill white -tag $tag
}
gondolabody {
$c create rect 0 -25 380 -22 -fill black -tag $tag
$c create rect 10 -26 370 -90 -fill [lindex $args 1] -tag $tag
$c create text 100 -70 -text [lindex $args 0] -fill white -tag $tag
$c create text 100 -50 -text $id -fill white -tag $tag
}
hopperbody {
$c create rect 0 -25 380 -22 -fill black -tag $tag
$c create poly 10 -100 10 -50 120 -10 130 -30 180 -10 190 -30\
200 -10 250 -30 260 -10 370 -50 370 -100 -fill [lindex $args 1] -tag $tag
$c create rect 10 -26 370 -100 -width 2 -tag $tag
for {set x 52} {$x<360} {incr x 93} {
$c create line $x -26 $x -100 -width 2 -tag $tag
}
$c create text 90 -50 -text "[lindex $args 0] $id" -fill white -tag $tag
$c create text 190 -60 -text [lindex $args 0] -font {Times 24 bold}\
-fill white -tag $tag
}
trailer {
set color [lindex $i 1]
$c create rect 40 -110 340 -50 -fill $color -tag $tag
$c create text 190 -80 -text "ROADWAY" \
-font {Helvetica 40} -fill green4 -tag $tag
$c create line 80 -50 80 -35 -width 3 -tag $tag
$c create oval 240 -50 260 -30 -fill gray50 -tag $tag
$c create oval 280 -50 300 -30 -fill gray50 -tag $tag
$c create oval 245 -45 255 -35 -fill $color -tag $tag
$c create oval 285 -45 295 -35 -fill $color -tag $tag
}
"" continue
default {error "bad definition word $cmd:\n$i"}
}
}
}
proc train {name rstock} {
variable data
set c $data(c)
set newx 0
foreach i $rstock {
$c move $i $data(curx) $data(y)
set data(curx) [lindex [$c bbox $i] 2]
$c addtag $name withtag $i
}
incr data(curx) 3000
}
proc crossing {x y} {
variable data
set c $data(c)
$c create line [expr $x-10] [expr $y-40] [expr $x+15] [expr $y-40]\
-width 3 -tag fg
$c create rect $x $y [expr $x+5] [expr $y-70] -fill orange -tag fg
$c create line [expr $x-15] [expr $y-80] [expr $x+20] [expr $y-60]\
-width 5 -fill white -tag fg
$c create line [expr $x-15] [expr $y-60] [expr $x+20] [expr $y-80]\
-width 5 -fill white -tag fg
$c create oval [expr $x-8] [expr $y-45] [expr $x-18] [expr $y-35]\
-fill white -tag fg
$c create oval [expr $x-10] [expr $y-43] [expr $x-16] [expr $y-37]\
-fill black -tag {fg blink0}
$c create oval [expr $x+15] [expr $y-45] [expr $x+25] [expr $y-35]\
-fill white -tag fg
$c create oval [expr $x+17] [expr $y-43] [expr $x+23] [expr $y-37]\
-fill black -tag {fg blink1}
set data(blink) 1
flashCrossing 0
}
proc flashCrossing {which} {
variable data
set c $data(c)
if $data(blink) {$c itemconfig blink$which -fill red -outline red}
set which [expr 1-$which]
$c itemconfig blink$which -fill black -outline black
after 250 [list [namespace current]::flashCrossing $which]
}
proc window {t x y w h {n 1} {space 10}} {
variable data
set c $data(c)
for {set i 0} {$i<$n} {incr i} {
$c create rect $x $y [expr $x+$w] [expr $y+$h] -fill black -tag $t
$c create rect [expr $x+3] [expr $y+3] [expr $x+$w] [expr $y+$h]\
-fill white -tag $t
set x [expr $x+$w+$space]
}
}
proc door {t x y w h winh} {
variable data
set c $data(c)
$c create rect $x $y [expr $x+$w] [expr $y+$h] -tag $t
incr w -8
incr x 4
incr y 4
window $t $x $y $w $winh
}
proc run {trains} {
variable data
set c $data(c)
foreach train $trains {
$c move $train -1 0
}
after idle [list [namespace current]::run2 $train]
}
proc run2 {trains} {
variable data
set c $data(c)
foreach train $trains {
if [lindex [$c bbox $train] 2]<0 {
$c move $train 15000 0
set data(blink) 0
} elseif [lindex [$c bbox $train] 0]<1500 {
set data(blink) 1
}
}
after [expr {10-$data(speed)}] [list [namespace current]::run $train]
$c raise fg
}
define F7A {
bogie 55 60
bogie 305 60
f7abody
}
define F7B {
bogie 55 60
bogie 305 60
f7bbody
}
define GP38 {
bogie 60 50
bogie 310 50
gp38body
}
define boxcar {
bogie 40 40
bogie 280 40
boxcarbody
}
define coach {
bogie 50 40
bogie 310 40
coachbody
}
define ocoach {
bogie 50 40
bogie 310 40
ocoachbody
}
define domecar {
bogie 50 40
bogie 310 40
domebody
}
define baggage {
bogie 50 40
bogie 310 40
baggagebody
}
define gondola {
bogie 40 40
bogie 280 40
gondolabody
}
define hopper {
bogie 30 40
bogie 290 40
hopperbody
}
define flatcar {
bogie 40 40
bogie 280 40
trailer gray85
flatcarbody
}
define caboose {
bogie 40 40
bogie 190 40
caboosebody
}
}
namespace eval rr {
# Usage examples, and demo:
init .c
create F7A I50I
create F7B I308
create GP38 3018
create GP38 3022
create hopper 12988 "N & W" grey30
create boxcar 42135 ATSF brown
create boxcar 42199 C&NW orange
create gondola 745219 N.Y.C. salmon4
create baggage 93152 "UNION PACIFIC" grey90
create coach 4312 "UNION PACIFIC" grey90
create domecar 7001 "UNION PACIFIC" grey95
create coach 4319 "UNION PACIFIC" grey90
create ocoach 4711 "BALTIMORE & OHIO" darkgreen
create ocoach 5006 "PENNSYLVANIA" firebrick
create caboose 18832 "U N I O N P A C I F I C" red2
create flatcar 88402 "BOSTON & MAINE" black
train UP1 {
F7A:I50I F7B:I308 baggage:93152 coach:4319 domecar:7001 coach:4312
ocoach:4711 ocoach:5006
}
train CP123 {
GP38:3018 GP38:3022 hopper:12988
boxcar:42135 flatcar:88402 gondola:745219 boxcar:42199
caboose:18832
}
run {CP123 UP1}
}Screenshots Section edit
gold swapped pix to wiki storage, underscores are not being accessed?
[trains2_scr1
] [trains2_scr2
] [trains2_scr3
]HJG 2015-05-20: pix have expired
