/usr/share/tcltk/tklib0.5/plotchart/plotannot.tcl is in tklib 0.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Facilities for annotating charts
#
# Note:
# This source file contains such functions as to draw a
# balloon text in an xy-graph.
# It is the companion of "plotchart.tcl"
#
#
# Static data
#
namespace eval ::Plotchart {
# Index, three pairs of scale factors to determine xy-coordinates
set BalloonDir(north-west) {0 0 1 -2 -2 1 0}
set BalloonDir(north) {1 -1 0 0 -3 1 0}
set BalloonDir(north-east) {2 -1 0 2 -2 0 1}
set BalloonDir(east) {3 0 -1 3 0 0 1}
set BalloonDir(south-east) {4 0 -1 2 2 -1 0}
set BalloonDir(south) {5 1 0 0 3 -1 0}
set BalloonDir(south-west) {6 1 0 -2 2 0 -1}
set BalloonDir(west) {7 0 1 -3 0 0 -1}
set TextDir(centre) c
set TextDir(center) c
set TextDir(c) c
set TextDir(north-west) nw
set TextDir(nw) nw
set TextDir(north) n
set TextDir(n) n
set TextDir(north-east) ew
set TextDir(ne) ew
set TextDir(east) e
set TextDir(e) e
set TextDir(south-west) nw
set TextDir(sw) sw
set TextDir(south) s
set TextDir(s) s
set TextDir(south-east) ew
set TextDir(east) e
}
# DefaultBalloon --
# Set the default properties of balloon text and other types of annotation
# Arguments:
# w Name of the canvas
# Result:
# None
# Side effects:
# Stores the default settings
#
proc ::Plotchart::DefaultBalloon { w } {
variable settings
foreach {option value} {font fixed
margin 5
textcolour black
justify left
arrowsize 5
background white
outline black
rimwidth 1} {
set settings($w,balloon$option) $value
}
foreach {option value} {font fixed
colour black
justify left} {
set settings($w,text$option) $value
}
}
# ConfigBalloon --
# Configure the properties of balloon text
# Arguments:
# w Name of the canvas
# args List of arguments
# Result:
# None
# Side effects:
# Stores the new settings for the next balloon text
#
proc ::Plotchart::ConfigBalloon { w args } {
variable settings
foreach {option value} $args {
set option [string range $option 1 end]
switch -- $option {
"font" -
"margin" -
"textcolour" -
"justify" -
"arrowsize" -
"background" -
"outline" -
"rimwidth" {
set settings($w,balloon$option) $value
}
"textcolor" {
set settings($w,balloontextcolour) $value
}
}
}
}
# DrawBalloon --
# Plot a balloon text in a chart
# Arguments:
# w Name of the canvas
# x X-coordinate of the point the arrow points to
# y Y-coordinate of the point the arrow points to
# text Text in the balloon
# dir Direction of the arrow (north, north-east, ...)
# Result:
# None
# Side effects:
# Text and polygon drawn in the chart
#
proc ::Plotchart::DrawBalloon { w x y text dir } {
variable settings
variable BalloonDir
#
# Create the item and then determine the coordinates
# of the frame around the text
#
set item [$w create text 0 0 -text $text -tag BalloonText \
-font $settings($w,balloonfont) -fill $settings($w,balloontextcolour) \
-justify $settings($w,balloonjustify)]
if { ![info exists BalloonDir($dir)] } {
set dir south-east
}
foreach {xmin ymin xmax ymax} [$w bbox $item] {break}
set xmin [expr {$xmin-$settings($w,balloonmargin)}]
set xmax [expr {$xmax+$settings($w,balloonmargin)}]
set ymin [expr {$ymin-$settings($w,balloonmargin)}]
set ymax [expr {$ymax+$settings($w,balloonmargin)}]
set xcentr [expr {($xmin+$xmax)/2}]
set ycentr [expr {($ymin+$ymax)/2}]
set coords [list $xmin $ymin \
$xcentr $ymin \
$xmax $ymin \
$xmax $ycentr \
$xmax $ymax \
$xcentr $ymax \
$xmin $ymax \
$xmin $ycentr ]
set idx [lindex $BalloonDir($dir) 0]
set scales [lrange $BalloonDir($dir) 1 end]
set factor $settings($w,balloonarrowsize)
set extraCoords {}
set xbase [lindex $coords [expr {2*$idx}]]
set ybase [lindex $coords [expr {2*$idx+1}]]
foreach {xscale yscale} $scales {
set xnew [expr {$xbase+$xscale*$factor}]
set ynew [expr {$ybase+$yscale*$factor}]
lappend extraCoords $xnew $ynew
}
#
# Insert the extra coordinates
#
set coords [eval lreplace [list $coords] [expr {2*$idx}] [expr {2*$idx+1}] \
$extraCoords]
set xpoint [lindex $coords [expr {2*$idx+2}]]
set ypoint [lindex $coords [expr {2*$idx+3}]]
set poly [$w create polygon $coords -tag BalloonFrame \
-fill $settings($w,balloonbackground) \
-width $settings($w,balloonrimwidth) \
-outline $settings($w,balloonoutline)]
#
# Position the two items
#
foreach {xtarget ytarget} [coordsToPixel $w $x $y] {break}
set dx [expr {$xtarget-$xpoint}]
set dy [expr {$ytarget-$ypoint}]
$w move $item $dx $dy
$w move $poly $dx $dy
$w raise BalloonFrame
$w raise BalloonText
}
# DrawPlainText --
# Plot plain text in a chart
# Arguments:
# w Name of the canvas
# x X-coordinate of the point the arrow points to
# y Y-coordinate of the point the arrow points to
# text Text to be drawn
# anchor Anchor position (north, north-east, ..., defaults to centre)
# Result:
# None
# Side effects:
# Text drawn in the chart
#
proc ::Plotchart::DrawPlainText { w x y text {anchor centre} } {
variable settings
variable TextDir
foreach {xtext ytext} [coordsToPixel $w $x $y] {break}
if { [info exists TextDir($anchor)] } {
set anchor $TextDir($anchor)
} else {
set anchor c
}
$w create text $xtext $ytext -text $text -tag PlainText \
-font $settings($w,textfont) -fill $settings($w,textcolour) \
-justify $settings($w,textjustify) -anchor $anchor
$w raise PlainText
}
# BrightenColour --
# Compute a brighter colour
# Arguments:
# color Original colour
# factor Factor by which to brighten the colour
# Result:
# New colour
# Note:
# Adapted from R. Suchenwirths Wiki page on 3D bars
#
proc ::Plotchart::BrightenColour {color factor} {
foreach i {r g b} n [winfo rgb . $color] d [winfo rgb . white] {
set $i [expr {int(255.*($n+($d-$n)*$factor)/$d)}]
}
format #%02x%02x%02x $r $g $b
}
# DrawGradientBackground --
# Add a gradient background to the plot
# Arguments:
# w Name of the canvas
# colour Main colour
# dir Direction of the gradient (left-right, top-down,
# bottom-up, right-left)
# rect (Optional) coordinates of the rectangle to be filled
# Result:
# None
# Side effects:
# Gradient background drawn in the chart
#
proc ::Plotchart::DrawGradientBackground { w colour dir {rect {}} } {
variable scaling
set pxmin $scaling($w,pxmin)
set pxmax $scaling($w,pxmax)
set pymin $scaling($w,pymin)
set pymax $scaling($w,pymax)
if { $rect != {} } {
foreach {rxmin rymin rxmax rymax} $rect {break}
} else {
set rxmin $pxmin
set rxmax $pxmax
set rymin $pymin
set rymax $pymax
}
switch -- $dir {
"left-right" {
set dir h
set first 0.0
set last 1.0
set fac [expr {($pxmax-$pxmin)/50.0}]
}
"right-left" {
set dir h
set first 1.0
set last 0.0
set fac [expr {($pxmax-$pxmin)/50.0}]
}
"top-down" {
set dir v
set first 0.0
set last 1.0
set fac [expr {($pymin-$pymax)/50.0}]
}
"bottom-up" {
set dir v
set first 1.0
set last 0.0
set fac [expr {($pymin-$pymax)/50.0}]
}
default {
set dir v
set first 0.0
set last 1.0
set fac [expr {($pymin-$pymax)/50.0}]
}
}
if { $dir == "h" } {
set x2 $rxmin
set y1 $rymin
set y2 $rymax
} else {
set y2 $rymax
set x1 $rxmin
set x2 $rxmax
}
set n 50
if { $dir == "h" } {
set nmax [expr {ceil($n*($rxmax-$rxmin)/double($pxmax-$pxmin))}]
} else {
set nmax [expr {ceil($n*($rymin-$rymax)/double($pymin-$pymax))}]
}
for { set i 0 } { $i < $nmax } { incr i } {
set factor [expr {($first*$i+$last*($n-$i-1))/double($n)}]
set gcolour [BrightenColour $colour $factor]
if { $dir == "h" } {
set x1 $x2
set x2 [expr {$rxmin+($i+1)*$fac}]
if { $i == $nmax-1 } {
set x2 $rxmax
}
} else {
set y1 $y2
set y2 [expr {$rymax+($i+1)*$fac}]
if { $i == $nmax-1 } {
set y2 $rymin
}
}
$w create rectangle $x1 $y1 $x2 $y2 -fill $gcolour -outline $gcolour -tag {data background}
}
$w lower data
$w lower background
}
# DrawImageBackground --
# Add an image (tilde) to the background to the plot
# Arguments:
# w Name of the canvas
# colour Main colour
# image Name of the image
# Result:
# None
# Side effects:
# Image appears in the plot area, tiled if needed
#
proc ::Plotchart::DrawImageBackground { w image } {
variable scaling
set pxmin $scaling($w,pxmin)
set pxmax $scaling($w,pxmax)
set pymin $scaling($w,pymin)
set pymax $scaling($w,pymax)
set iwidth [image width $image]
set iheight [image height $image]
for { set y $pymax } { $y > $pymin } { set y [expr {$y-$iheight}] } {
for { set x $pxmin } { $x < $pxmax } { incr x $iwidth } {
$w create image $x $y -image $image -anchor sw -tags {data background}
}
}
$w lower data
$w lower background
}
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