/usr/share/tcltk/tklib0.5/plotchart/plotaxis.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 to draw simple plots in a dedicated canvas
#
# Note:
# This source file contains the functions for drawing the axes
# and the legend. It is the companion of "plotchart.tcl"
#
# DrawYaxis --
# Draw the y-axis
# Arguments:
# w Name of the canvas
# ymin Minimum y coordinate
# ymax Maximum y coordinate
# ystep Step size
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawYaxis { w ymin ymax ydelt } {
variable scaling
variable config
set scaling($w,ydelt) $ydelt
$w delete yaxis
set linecolor $config($w,leftaxis,color)
set textcolor $config($w,leftaxis,textcolor)
set textfont $config($w,leftaxis,font)
set ticklength $config($w,leftaxis,ticklength)
set thickness $config($w,leftaxis,thickness)
set offtick [expr {($ticklength > 0)? $ticklength+2 : 2}]
$w create line $scaling($w,pxmin) $scaling($w,pymin) \
$scaling($w,pxmin) $scaling($w,pymax) \
-fill $linecolor -tag yaxis -width $thickness
set format $config($w,leftaxis,format)
if { [info exists scaling($w,-format,y)] } {
set format $scaling($w,-format,y)
}
if { $ymax > $ymin } {
set y [expr {$ymin+0.0}] ;# Make sure we have the number in the right format
set ym $ymax
} else {
set y [expr {$ymax+0.0}]
set ym $ymin
}
set yt [expr {$ymin+0.0}]
set scaling($w,yaxis) {}
while { $y < $ym+0.5*abs($ydelt) } {
foreach {xcrd ycrd} [coordsToPixel $w $scaling($w,xmin) $yt] {break}
set xcrd2 [expr {$xcrd-$ticklength}]
set xcrd3 [expr {$xcrd-$offtick}]
lappend scaling($w,yaxis) $ycrd
set ylabel $yt
if { $format != "" } {
set ylabel [format $format $y]
}
$w create line $xcrd2 $ycrd $xcrd $ycrd -tag yaxis -fill $linecolor
$w create text $xcrd3 $ycrd -text $ylabel -tag yaxis -anchor e \
-fill $textcolor -font $textfont
set y [expr {$y+abs($ydelt)}]
set yt [expr {$yt+$ydelt}]
if { abs($yt) < 0.5*abs($ydelt) } {
set yt 0.0
}
}
}
# DrawRightaxis --
# Draw the y-axis on the right-hand side
# Arguments:
# w Name of the canvas
# ymin Minimum y coordinate
# ymax Maximum y coordinate
# ystep Step size
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawRightaxis { w ymin ymax ydelt } {
variable scaling
variable config
set scaling($w,ydelt) $ydelt
$w delete raxis
set linecolor $config($w,rightaxis,color)
set textcolor $config($w,rightaxis,textcolor)
set textfont $config($w,rightaxis,font)
set thickness $config($w,rightaxis,thickness)
set ticklength $config($w,rightaxis,ticklength)
set offtick [expr {($ticklength > 0)? $ticklength+2 : 2}]
$w create line $scaling($w,pxmax) $scaling($w,pymin) \
$scaling($w,pxmax) $scaling($w,pymax) \
-fill $linecolor -tag raxis -width $thickness
set format $config($w,rightaxis,format)
if { [info exists scaling($w,-format,y)] } {
set format $scaling($w,-format,y)
}
if { $ymax > $ymin } {
set y [expr {$ymin+0.0}] ;# Make sure we have the number in the right format
set ym $ymax
} else {
set y [expr {$ymax+0.0}]
set ym $ymin
}
set yt [expr {$ymin+0.0}]
set scaling($w,yaxis) {}
while { $y < $ym+0.5*abs($ydelt) } {
foreach {xcrd ycrd} [coordsToPixel $w $scaling($w,xmax) $yt] {break}
set xcrd2 [expr {$xcrd+$ticklength}]
set xcrd3 [expr {$xcrd+$offtick}]
lappend scaling($w,yaxis) $ycrd
set ylabel $yt
if { $format != "" } {
set ylabel [format $format $yt]
}
$w create line $xcrd2 $ycrd $xcrd $ycrd -tag raxis -fill $linecolor
$w create text $xcrd3 $ycrd -text $ylabel -tag raxis -anchor w \
-fill $textcolor -font $textfont
set y [expr {$y+abs($ydelt)}]
set yt [expr {$yt+$ydelt}]
if { abs($yt) < 0.5*abs($ydelt) } {
set yt 0.0
}
}
}
# DrawLogYaxis --
# Draw the logarithmic y-axis
# Arguments:
# w Name of the canvas
# ymin Minimum y coordinate
# ymax Maximum y coordinate
# ystep Step size
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawLogYaxis { w ymin ymax ydelt } {
variable scaling
variable config
set scaling($w,ydelt) $ydelt
$w delete yaxis
set linecolor $config($w,leftaxis,color)
set textcolor $config($w,leftaxis,textcolor)
set textfont $config($w,leftaxis,font)
set thickness $config($w,leftaxis,thickness)
set ticklength $config($w,leftaxis,ticklength)
set offtick [expr {($ticklength > 0)? $ticklength+2 : 2}]
$w create line $scaling($w,pxmin) $scaling($w,pymin) \
$scaling($w,pxmin) $scaling($w,pymax) \
-fill $linecolor -tag yaxis -width $thickness
set format $config($w,bottomaxis,format)
set format $config($w,leftaxis,format)
if { [info exists scaling($w,-format,y)] } {
set format $scaling($w,-format,y)
}
set scaling($w,yaxis) {}
set y [expr {pow(10.0,floor(log10($ymin)))}]
set ylogmax [expr {pow(10.0,ceil(log10($ymax)))+0.1}]
while { $y < $ylogmax } {
#
# Labels and tickmarks
#
foreach factor {1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0} {
set yt [expr {$y*$factor}]
if { $yt < $ymin } continue
if { $yt > $ymax } break
foreach {xcrd ycrd} [coordsToPixel $w $scaling($w,xmin) [expr {log10($yt)}]] {break}
set xcrd2 [expr {$xcrd-$ticklength}]
set xcrd3 [expr {$xcrd-$offtick}]
lappend scaling($w,yaxis) $ycrd
set ylabel $y
if { $format != "" } {
set ylabel [format $format $y]
}
$w create line $xcrd2 $ycrd $xcrd $ycrd -tag yaxis -fill $linecolor
if { $factor == 1.0 } {
$w create text $xcrd3 $ycrd -text $ylabel -tag yaxis -anchor e \
-fill $textcolor -font $textfont
}
}
set y [expr {10.0*$y}]
}
}
# DrawXaxis --
# Draw the x-axis
# Arguments:
# w Name of the canvas
# xmin Minimum x coordinate
# xmax Maximum x coordinate
# xstep Step size
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawXaxis { w xmin xmax xdelt } {
variable scaling
variable config
set scaling($w,xdelt) $xdelt
$w delete xaxis
set linecolor $config($w,bottomaxis,color)
set textcolor $config($w,bottomaxis,textcolor)
set textfont $config($w,bottomaxis,font)
set thickness $config($w,bottomaxis,thickness)
set ticklength $config($w,bottomaxis,ticklength)
set offtick [expr {($ticklength > 0)? $ticklength+2 : 2}]
$w create line $scaling($w,pxmin) $scaling($w,pymax) \
$scaling($w,pxmax) $scaling($w,pymax) \
-fill black -tag xaxis
set format $config($w,bottomaxis,format)
if { [info exists scaling($w,-format,x)] } {
set format $scaling($w,-format,x)
}
if { $xmax > $xmin } {
set x [expr {$xmin+0.0}] ;# Make sure we have the number in the right format
set xm $xmax
} else {
set x [expr {$xmax+0.0}]
set xm $xmin
}
set xt [expr {$xmin+0.0}]
set scaling($w,xaxis) {}
while { $x < $xm+0.5*abs($xdelt) } {
foreach {xcrd ycrd} [coordsToPixel $w $xt $scaling($w,ymin)] {break}
set ycrd2 [expr {$ycrd+$ticklength}]
set ycrd3 [expr {$ycrd+$offtick}]
lappend scaling($w,xaxis) $xcrd
set xlabel $xt
if { $format != "" } {
set xlabel [format $format $xt]
}
$w create line $xcrd $ycrd2 $xcrd $ycrd -tag xaxis -fill $linecolor
$w create text $xcrd $ycrd3 -text $xlabel -tag xaxis -anchor n \
-fill $textcolor -font $textfont
set x [expr {$x+abs($xdelt)}]
set xt [expr {$xt+$xdelt}]
if { abs($x) < 0.5*abs($xdelt) } {
set xt 0.0
}
}
set scaling($w,xdelt) $xdelt
}
# DrawXtext --
# Draw text to the x-axis
# Arguments:
# w Name of the canvas
# text Text to be drawn
# Result:
# None
# Side effects:
# Text drawn in canvas
#
proc ::Plotchart::DrawXtext { w text } {
variable scaling
variable config
set textcolor $config($w,bottomaxis,textcolor)
set textfont $config($w,bottomaxis,font)
set xt [expr {($scaling($w,pxmin)+$scaling($w,pxmax))/2}]
set yt [expr {$scaling($w,pymax)+18}]
$w create text $xt $yt -text $text -fill $textcolor -anchor n -font $textfont
}
# DrawYtext --
# Draw text to the y-axis
# Arguments:
# w Name of the canvas
# text Text to be drawn
# Result:
# None
# Side effects:
# Text drawn in canvas
#
proc ::Plotchart::DrawYtext { w text } {
variable scaling
variable config
if { [string match "r*" $w] == 0 } {
set textcolor $config($w,leftaxis,textcolor)
set textfont $config($w,leftaxis,font)
set xt $scaling($w,pxmin)
set anchor se
} else {
set textcolor $config($w,rightaxis,textcolor)
set textfont $config($w,rightaxis,font)
set xt $scaling($w,pxmax)
set anchor sw
}
set yt [expr {$scaling($w,pymin)-8}]
$w create text $xt $yt -text $text -fill $textcolor -anchor $anchor -font $textfont
}
# DrawPolarAxes --
# Draw thw two polar axes
# Arguments:
# w Name of the canvas
# rad_max Maximum radius
# rad_step Step in radius
# Result:
# None
# Side effects:
# Axes drawn in canvas
#
proc ::Plotchart::DrawPolarAxes { w rad_max rad_step } {
variable config
set linecolor $config($w,axis,color)
set textcolor $config($w,axis,textcolor)
set textfont $config($w,axis,font)
set thickness $config($w,axis,thickness)
set bgcolor $config($w,background,innercolor)
#
# Draw the spikes
#
set angle 0.0
foreach {xcentre ycentre} [polarToPixel $w 0.0 0.0] {break}
while { $angle < 360.0 } {
foreach {xcrd ycrd} [polarToPixel $w $rad_max $angle] {break}
foreach {xtxt ytxt} [polarToPixel $w [expr {1.05*$rad_max}] $angle] {break}
$w create line $xcentre $ycentre $xcrd $ycrd -fill $linecolor -width $thickness
if { $xcrd > $xcentre } {
set dir w
} else {
set dir e
}
$w create text $xtxt $ytxt -text $angle -anchor $dir -fill $textcolor -font $textfont
set angle [expr {$angle+30}]
}
#
# Draw the concentric circles
#
set rad $rad_step
while { $rad < $rad_max+0.5*$rad_step } {
foreach {xright ytxt} [polarToPixel $w $rad 0.0] {break}
foreach {xleft ycrd} [polarToPixel $w $rad 180.0] {break}
foreach {xcrd ytop} [polarToPixel $w $rad 90.0] {break}
foreach {xcrd ybottom} [polarToPixel $w $rad 270.0] {break}
set oval [$w create oval $xleft $ytop $xright $ybottom -outline $linecolor -width $thickness -fill {}]
$w lower $oval
$w create text $xright [expr {$ytxt+3}] -text $rad -anchor n -fill $textcolor -font $textfont
set rad [expr {$rad+$rad_step}]
}
}
# DrawXlabels --
# Draw the labels to an x-axis (barchart)
# Arguments:
# w Name of the canvas
# xlabels List of labels
# noseries Number of series or "stacked"
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawXlabels { w xlabels noseries } {
variable scaling
variable config
set linecolor $config($w,bottomaxis,color)
set textcolor $config($w,bottomaxis,textcolor)
set textfont $config($w,bottomaxis,font)
set thickness $config($w,bottomaxis,thickness)
$w delete xaxis
$w create line $scaling($w,pxmin) $scaling($w,pymax) \
$scaling($w,pxmax) $scaling($w,pymax) \
-fill $linecolor -width $thickness -tag xaxis
set x 0.5
set scaling($w,ybase) {}
foreach label $xlabels {
foreach {xcrd ycrd} [coordsToPixel $w $x $scaling($w,ymin)] {break}
set ycrd [expr {$ycrd+2}]
$w create text $xcrd $ycrd -text $label -tag xaxis -anchor n \
-fill $textcolor -font $textfont
set x [expr {$x+1.0}]
lappend scaling($w,ybase) 0.0
}
set scaling($w,xbase) 0.0
if { $noseries != "stacked" } {
set scaling($w,stacked) 0
set scaling($w,xshift) [expr {1.0/$noseries}]
set scaling($w,barwidth) [expr {1.0/$noseries}]
} else {
set scaling($w,stacked) 1
set scaling($w,xshift) 0.0
set scaling($w,barwidth) 0.8
set scaling($w,xbase) 0.1
}
}
# DrawYlabels --
# Draw the labels to a y-axis (barchart)
# Arguments:
# w Name of the canvas
# ylabels List of labels
# noseries Number of series or "stacked"
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawYlabels { w ylabels noseries } {
variable scaling
variable config
set linecolor $config($w,leftaxis,color)
set textcolor $config($w,leftaxis,textcolor)
set textfont $config($w,leftaxis,font)
set thickness $config($w,leftaxis,thickness)
$w delete yaxis
$w create line $scaling($w,pxmin) $scaling($w,pymin) \
$scaling($w,pxmin) $scaling($w,pymax) \
-fill $linecolor -width $thickness -tag yaxis
set y 0.5
set scaling($w,xbase) {}
foreach label $ylabels {
foreach {xcrd ycrd} [coordsToPixel $w $scaling($w,xmin) $y] {break}
set xcrd [expr {$xcrd-2}]
$w create text $xcrd $ycrd -text $label -tag yaxis -anchor e \
-fill $textcolor -font $textfont
set y [expr {$y+1.0}]
lappend scaling($w,xbase) 0.0
}
set scaling($w,ybase) 0.0
if { $noseries != "stacked" } {
set scaling($w,stacked) 0
set scaling($w,yshift) [expr {1.0/$noseries}]
set scaling($w,barwidth) [expr {1.0/$noseries}]
} else {
set scaling($w,stacked) 1
set scaling($w,yshift) 0.0
set scaling($w,barwidth) 0.8
set scaling($w,ybase) 0.1
}
}
# XConfig --
# Configure the x-axis for an XY plot
# Arguments:
# w Name of the canvas
# args Option and value pairs
# Result:
# None
#
proc ::Plotchart::XConfig { w args } {
AxisConfig xyplot $w x DrawXaxis $args
}
# YConfig --
# Configure the y-axis for an XY plot
# Arguments:
# w Name of the canvas
# args Option and value pairs
# Result:
# None
#
proc ::Plotchart::YConfig { w args } {
AxisConfig xyplot $w y DrawYaxis $args
}
# AxisConfig --
# Configure an axis and redraw it if necessary
# Arguments:
# plottype Type of plot
# w Name of the canvas
# orient Orientation of the axis
# drawmethod Drawing method
# option_values Option/value pairs
# Result:
# None
#
proc ::Plotchart::AxisConfig { plottype w orient drawmethod option_values } {
variable scaling
variable axis_options
variable axis_option_clear
variable axis_option_values
set clear_data 0
foreach {option value} $option_values {
set idx [lsearch $axis_options $option]
if { $idx < 0 } {
return -code error "Unknown or invalid option: $option (value: $value)"
} else {
set clear_data [lindex $axis_option_clear $idx]
set values [lindex $axis_option_values [expr {2*$idx+1}]]
if { $values != "..." } {
if { [lsearch $values $value] < 0 } {
return -code error "Unknown or invalid value: $value for option $option - $values"
}
}
set scaling($w,$option,$orient) $value
if { $option == "-scale" } {
set min ${orient}min
set max ${orient}max
set delt ${orient}delt
foreach [list $min $max $delt] $value {break}
set scaling($w,$min) [set $min]
set scaling($w,$max) [set $max]
set scaling($w,$delt) [set $delt]
}
}
}
if { $clear_data } {
$w delete data
}
if { $orient == "x" } {
$drawmethod $w $scaling($w,xmin) $scaling($w,xmax) $scaling($w,xdelt)
}
if { $orient == "y" } {
$drawmethod $w $scaling($w,ymin) $scaling($w,ymax) $scaling($w,ydelt)
}
if { $orient == "z" } {
$drawmethod $w $scaling($w,zmin) $scaling($w,zmax) $scaling($w,zdelt)
}
}
# DrawXTicklines --
# Draw the ticklines for the x-axis
# Arguments:
# w Name of the canvas
# colour Colour of the ticklines
# Result:
# None
#
proc ::Plotchart::DrawXTicklines { w {colour black} } {
DrawTicklines $w x $colour
}
# DrawYTicklines --
# Draw the ticklines for the y-axis
# Arguments:
# w Name of the canvas
# colour Colour of the ticklines
# Result:
# None
#
proc ::Plotchart::DrawYTicklines { w {colour black} } {
DrawTicklines $w y $colour
}
# DrawTicklines --
# Draw the ticklines
# Arguments:
# w Name of the canvas
# axis Which axis (x or y)
# colour Colour of the ticklines
# Result:
# None
#
proc ::Plotchart::DrawTicklines { w axis {colour black} } {
variable scaling
if { $axis == "x" } {
#
# Cater for both regular x-axes and time-axes
#
if { [info exists scaling($w,xaxis)] } {
set botaxis xaxis
} else {
set botaxis taxis
}
if { $colour != {} } {
foreach x $scaling($w,$botaxis) {
$w create line $x $scaling($w,pymin) \
$x $scaling($w,pymax) \
-fill $colour -tag xtickline
}
} else {
$w delete xtickline
}
} else {
if { $colour != {} } {
foreach y $scaling($w,yaxis) {
$w create line $scaling($w,pxmin) $y \
$scaling($w,pxmax) $y \
-fill $colour -tag ytickline
}
} else {
$w delete ytickline
}
}
}
# DefaultLegend --
# Set all legend options to default
# Arguments:
# w Name of the canvas
# Result:
# None
#
proc ::Plotchart::DefaultLegend { w } {
variable legend
variable config
set legend($w,background) $config($w,legend,background)
set legend($w,border) $config($w,legend,border)
set legend($w,canvas) $w
set legend($w,position) $config($w,legend,position)
set legend($w,series) ""
set legend($w,text) ""
}
# LegendConfigure --
# Configure the legend
# Arguments:
# w Name of the canvas
# args Key-value pairs
# Result:
# None
#
proc ::Plotchart::LegendConfigure { w args } {
variable legend
foreach {option value} $args {
switch -- $option {
"-background" {
set legend($w,background) $value
}
"-border" {
set legend($w,border) $value
}
"-canvas" {
set legend($w,canvas) $value
}
"-position" {
if { [lsearch {top-left top-right bottom-left bottom-right} $value] >= 0 } {
set legend($w,position) $value
} else {
return -code error "Unknown or invalid position: $value"
}
}
default {
return -code error "Unknown or invalid option: $option (value: $value)"
}
}
}
}
# DrawLegend --
# Draw or extend the legend
# Arguments:
# w Name of the canvas
# series For which series?
# text Text to be shown
# Result:
# None
#
proc ::Plotchart::DrawLegend { w series text } {
variable legend
variable scaling
variable data_series
if { [string match r* $w] } {
set w [string range $w 1 end]
}
lappend legend($w,series) $series
lappend legend($w,text) $text
set legendw $legend($w,canvas)
$legendw delete legend
$legendw delete legendbg
set y 0
foreach series $legend($w,series) text $legend($w,text) {
set colour "black"
if { [info exists data_series($w,$series,-colour)] } {
set colour $data_series($w,$series,-colour)
}
set type "line"
if { [info exists data_series($w,$series,-type)] } {
set type $data_series($w,$series,-type)
}
if { [info exists data_series($w,legendtype)] } {
set type $data_series($w,legendtype)
}
# TODO: line or rectangle!
if { $type != "rectangle" } {
$legendw create line 0 $y 15 $y -fill $colour -tag legend
if { $type == "symbol" || $type == "both" } {
set symbol "dot"
if { [info exists data_series($w,$series,-symbol)] } {
set symbol $data_series($w,$series,-symbol)
}
DrawSymbolPixel $legendw $series 7 $y $symbol $colour [list legend legend_$series]
}
} else {
$legendw create rectangle 0 [expr {$y-3}] 15 [expr {$y+3}] \
-fill $colour -tag [list legend legend_$series]
}
$legendw create text 25 $y -text $text -anchor w -tag [list legend legend_$series]
incr y 10 ;# TODO: size of font!
}
#
# Now the frame and the background
#
foreach {xl yt xr yb} [$legendw bbox legend] {break}
set xl [expr {$xl-2}]
set xr [expr {$xr+2}]
set yt [expr {$yt-2}]
set yb [expr {$yb+2}]
$legendw create rectangle $xl $yt $xr $yb -fill $legend($w,background) \
-outline $legend($w,border) -tag legendbg
$legendw raise legend
if { $w == $legendw } {
switch -- $legend($w,position) {
"top-left" {
set dx [expr { 10+$scaling($w,pxmin)-$xl}]
set dy [expr { 10+$scaling($w,pymin)-$yt}]
}
"top-right" {
set dx [expr {-10+$scaling($w,pxmax)-$xr}]
set dy [expr { 10+$scaling($w,pymin)-$yt}]
}
"bottom-left" {
set dx [expr { 10+$scaling($w,pxmin)-$xl}]
set dy [expr {-10+$scaling($w,pymax)-$yb}]
}
"bottom-right" {
set dx [expr {-10+$scaling($w,pxmax)-$xr}]
set dy [expr {-10+$scaling($w,pymax)-$yb}]
}
}
} else {
set dx 10
set dy 10
}
$legendw move legend $dx $dy
$legendw move legendbg $dx $dy
}
# DrawTimeaxis --
# Draw the date/time-axis
# Arguments:
# w Name of the canvas
# tmin Minimum date/time
# tmax Maximum date/time
# tstep Step size in days
# Result:
# None
# Side effects:
# Axis drawn in canvas
#
proc ::Plotchart::DrawTimeaxis { w tmin tmax tdelt } {
variable scaling
variable config
set linecolor $config($w,bottomaxis,color)
set textcolor $config($w,bottomaxis,textcolor)
set textfont $config($w,bottomaxis,font)
set thickness $config($w,bottomaxis,thickness)
set ticklength $config($w,bottomaxis,ticklength)
set offtick [expr {($ticklength > 0)? $ticklength+2 : 2}]
set scaling($w,tdelt) $tdelt
$w delete taxis
$w create line $scaling($w,pxmin) $scaling($w,pymax) \
$scaling($w,pxmax) $scaling($w,pymax) \
-fill $linecolor -width $thickness -tag taxis
set format $config($w,bottomaxis,format)
if { [info exists scaling($w,-format,x)] } {
set format $scaling($w,-format,x)
}
set ttmin [clock scan $tmin]
set ttmax [clock scan $tmax]
set t [expr {int($ttmin)}]
set ttdelt [expr {$tdelt*86400.0}]
set scaling($w,taxis) {}
while { $t < $ttmax+0.5*$ttdelt } {
foreach {xcrd ycrd} [coordsToPixel $w $t $scaling($w,ymin)] {break}
set ycrd2 [expr {$ycrd+$ticklength}]
set ycrd3 [expr {$ycrd+$offtick}]
lappend scaling($w,taxis) $xcrd
if { $format != "" } {
set tlabel [clock format $t -format $format]
} else {
set tlabel [clock format $t -format "%Y-%m-%d"]
}
$w create line $xcrd $ycrd2 $xcrd $ycrd -tag taxis -fill $linecolor
$w create text $xcrd $ycrd3 -text $tlabel -tag taxis -anchor n \
-fill $textcolor -font $textfont
set t [expr {int($t+$ttdelt)}]
}
set scaling($w,tdelt) $tdelt
}
# RescalePlot --
# Partly redraw the XY plot to allow for new axes
# Arguments:
# w Name of the canvas
# xscale New minimum, maximum and step for x-axis
# yscale New minimum, maximum and step for y-axis
# Result:
# None
# Side effects:
# Axes redrawn in canvas, data scaled and moved
# Note:
# Symbols will be scaled as well!
#
proc ::Plotchart::RescalePlot { w xscale yscale } {
variable scaling
foreach {xmin xmax xdelt} $xscale {break}
foreach {ymin ymax ydelt} $yscale {break}
if { $xdelt == 0.0 || $ydelt == 0.0 } {
return -code error "Step size can not be zero"
}
if { ($xmax-$xmin)*$xdelt < 0.0 } {
set xdelt [expr {-$xdelt}]
}
if { ($ymax-$ymin)*$ydelt < 0.0 } {
set ydelt [expr {-$ydelt}]
}
$w delete xaxis
$w delete yaxis
#
# Zoom in to the new scaling: move and scale the existing data
#
foreach {xb yb} [coordsToPixel $w $scaling($w,xmin) $scaling($w,ymin)] {break} ;# Extreme pixels
foreach {xe ye} [coordsToPixel $w $scaling($w,xmax) $scaling($w,ymax)] {break} ;# Extreme pixels
foreach {xnb ynb} [coordsToPixel $w $xmin $ymin] {break} ;# Current pixels of new rectangle
foreach {xne yne} [coordsToPixel $w $xmax $ymax] {break}
set fx [expr {($xe-$xb)/double($xne-$xnb)}]
set fy [expr {($ye-$yb)/double($yne-$ynb)}]
$w scale data $xnb $ynb $fx $fy
$w move data [expr {$xb-$xnb}] [expr {$yb-$ynb}]
worldCoordinates $w $xmin $ymin $xmax $ymax
DrawYaxis $w $ymin $ymax $ydelt
DrawXaxis $w $xmin $xmax $xdelt
}
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