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# Copyright (C) 1999-2021
# Smithsonian Astrophysical Observatory, Cambridge, MA, USA
# For conditions of distribution and use, see copyright notice in "copyright"
package provide DS9 1.0
proc PlotZoomStack {g} {
# a bit of a hack to determine varname
set varname [lindex [split $g {.}] 1]
upvar #0 $varname var
global $varname
set cmd {}
switch $var(canvas,layout) {
grid -
column -
row {}
strip {
set min [$g axis cget x -min]
set max [$g axis cget x -max]
set logscale [$g axis cget x -logscale]
foreach cc $var(graphs) {
if {$var($cc,graph) != $g} {
$var($cc,graph) axis configure x -min $min -max $max -logscale $logscale
}
}
}
}
}
proc PlotZoomStackReset {g} {
# a bit of a hack to determine varname
set varname [lindex [split $g {.}] 1]
upvar #0 $varname var
global $varname
set cmd {}
switch $var(canvas,layout) {
grid -
column -
row {}
strip {
set min [$g axis cget x -min]
set max [$g axis cget x -max]
set logscale [$g axis cget x -logscale]
foreach cc $var(graphs) {
if {$var($cc,graph) != $g} {
append cmd "[list $var($cc,graph) axis configure x -min $min -max $max -logscale $logscale]\n"
}
}
}
}
return $cmd
}
# These are redefinitions to provide a callback for stip graphs
# tkblt/library/graph.tcl
namespace eval blt::ZoomStack {}
proc blt::ZoomStack::Push { g } {
variable _private
catch {eval $g marker delete [$g marker names "zoom*"]}
if { [info exists _private($g,afterId)] } {
after cancel $_private($g,afterId)
}
set x1 $_private($g,A,x)
set y1 $_private($g,A,y)
set x2 $_private($g,B,x)
set y2 $_private($g,B,y)
if { ($x1 == $x2) || ($y1 == $y2) } {
# No delta, revert to start
return
}
set cmd {}
foreach axis [$g axis names] {
if { [$g axis cget $axis -hide] } {
continue
}
set min [$g axis cget $axis -min]
set max [$g axis cget $axis -max]
set logscale [$g axis cget $axis -logscale]
# Save the current scale (log or linear) so that we can restore it.
# This is for the case where the user changes to logscale while
# zooming. A previously pushed axis limit could be negative. It
# seems better for popping the zoom stack to restore a previous view
# (not convert the ranges).
set c [list $g axis configure $axis]
lappend c -min $min -max $max -logscale $logscale
append cmd "$c\n"
}
append cmd [PlotZoomStackReset $g]
# This effectively pushes the command to reset the graph to the current
# zoom level onto the stack. This is useful if the new axis ranges are
# bad and we need to reset the zoom stack.
set _private($g,stack) [linsert $_private($g,stack) 0 $cmd]
foreach axis [$g axis names] {
if { [$g axis cget $axis -hide] } {
continue; # Don't set zoom on axes not displayed.
}
set type [$g axis type $axis]
if { $type == "x" } {
set min [$g axis invtransform $axis $x1]
set max [$g axis invtransform $axis $x2]
} elseif { $type == "y" } {
set min [$g axis invtransform $axis $y1]
set max [$g axis invtransform $axis $y2]
} else {
continue; # Axis is not bound to any margin.
}
if { ![SetAxisRanges $g $axis $min $max] } {
Pop $g
bell
return
}
}
update; # This "update" redraws the graph
}
proc blt::ZoomStack::SetAxisRanges { g axis min max } {
if { $min > $max } {
set tmp $max; set max $min; set min $tmp
}
if { [catch { $g axis configure $axis -min $min -max $max }] != 0 } {
return 0
}
PlotZoomStack $g
return 1
}
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