--- /dev/null
+package provide Tkblt 3.0
+
+namespace eval ::blt::legend {
+ variable _private
+ array set _private {
+ afterId ""
+ scroll 0
+ space off
+ drag 0
+ x 0
+ y 0
+ }
+}
+
+namespace eval ::blt::ZoomStack {
+ variable _private
+ array set _private {
+ afterId ""
+ scroll 0
+ space off
+ drag 0
+ x 0
+ y 0
+ }
+}
+
+proc blt::legend::SetSelectionAnchor { w tagOrId } {
+ set elem [$w legend get $tagOrId]
+ # If the anchor hasn't changed, don't do anything
+ if { $elem != [$w legend get anchor] } {
+ $w legend selection clearall
+ $w legend focus $elem
+ $w legend selection set $elem
+ $w legend selection anchor $elem
+ }
+}
+
+# ----------------------------------------------------------------------
+#
+# MoveFocus --
+#
+# Invoked by KeyPress bindings. Moves the active selection to
+# the entry <where>, which is an index such as "up", "down",
+# "prevsibling", "nextsibling", etc.
+#
+# ----------------------------------------------------------------------
+proc blt::legend::MoveFocus { w elem } {
+ catch {$w legend focus $elem} result
+ puts stderr "result=$result elem=$elem"
+ if { [$w legend cget -selectmode] == "single" } {
+ $w legend selection clearall
+ $w legend selection set focus
+ $w legend selection anchor focus
+ }
+}
+
+
+proc Blt_ActiveLegend { g } {
+ $g legend bind all <Enter> [list blt::ActivateLegend $g ]
+ $g legend bind all <Leave> [list blt::DeactivateLegend $g]
+ $g legend bind all <ButtonPress-1> [list blt::HighlightLegend $g]
+}
+
+proc Blt_Crosshairs { g } {
+ blt::Crosshairs $g
+}
+
+proc Blt_ResetCrosshairs { g state } {
+ blt::Crosshairs $g "Any-Motion" $state
+}
+
+proc Blt_ZoomStack { g args } {
+ array set params {
+ -mode click
+ -button "ButtonPress-3"
+ }
+ array set params $args
+ if { $params(-mode) == "click" } {
+ blt::ZoomStack::ClickClick $g $params(-button)
+ } else {
+ blt::ZoomStack::ClickRelease $g $params(-button)
+ }
+}
+
+proc Blt_ClosestPoint { g } {
+ blt::ClosestPoint $g
+}
+
+#
+# The following procedures that reside in the "blt" namespace are
+# supposed to be private.
+#
+
+proc blt::ActivateLegend { g } {
+ set elem [$g legend get current]
+ $g legend activate $elem
+}
+proc blt::DeactivateLegend { g } {
+ set elem [$g legend get current]
+ $g legend deactivate $elem
+}
+
+proc blt::HighlightLegend { g } {
+ set elem [$g legend get current]
+ if { $elem != "" } {
+ set relief [$g element cget $elem -legendrelief]
+ if { $relief == "flat" } {
+ $g element configure $elem -legendrelief raised
+ $g element activate $elem
+ } else {
+ $g element configure $elem -legendrelief flat
+ $g element deactivate $elem
+ }
+ }
+}
+
+proc blt::Crosshairs { g {event "Any-Motion"} {state "on"}} {
+ $g crosshairs $state
+ bind crosshairs-$g <$event> {
+ %W crosshairs configure -position @%x,%y
+ }
+ bind crosshairs-$g <Leave> {
+ %W crosshairs off
+ }
+ bind crosshairs-$g <Enter> {
+ %W crosshairs on
+ }
+ $g crosshairs configure -color red
+ if { $state == "on" } {
+ blt::AddBindTag $g crosshairs-$g
+ } elseif { $state == "off" } {
+ blt::RemoveBindTag $g crosshairs-$g
+ }
+}
+
+proc blt::ClosestPoint { g {event "Control-ButtonPress-2"} } {
+ bind closest-point-$g <$event> {
+ blt::FindElement %W %x %y
+ }
+ blt::AddBindTag $g closest-point-$g
+}
+
+proc blt::AddBindTag { widget tag } {
+ set oldTagList [bindtags $widget]
+ if { [lsearch $oldTagList $tag] < 0 } {
+ bindtags $widget [linsert $oldTagList 0 $tag]
+ }
+}
+
+proc blt::RemoveBindTag { widget tag } {
+ set oldTagList [bindtags $widget]
+ set index [lsearch $oldTagList $tag]
+ if { $index >= 0 } {
+ bindtags $widget [lreplace $oldTagList $index $index]
+ }
+}
+
+proc blt::FindElement { g x y } {
+ array set info [$g element closest $x $y -interpolate yes]
+ if { ![info exists info(name)] } {
+ beep
+ return
+ }
+ # --------------------------------------------------------------
+ # find(name) - element Id
+ # find(index) - index of closest point
+ # find(x) find(y) - coordinates of closest point
+ # or closest point on line segment.
+ # find(dist) - distance from sample coordinate
+ # --------------------------------------------------------------
+ set markerName "bltClosest_$info(name)"
+ catch { $g marker delete $markerName }
+ $g marker create text $markerName \
+ -coords "$info(x) $info(y)" \
+ -text "$info(name): $info(dist)\nindex $info(index)" \
+ -anchor center -justify left \
+ -yoffset 0 -bg {}
+
+ set coords [$g invtransform $x $y]
+ set nx [lindex $coords 0]
+ set ny [lindex $coords 1]
+
+ $g marker create line line.$markerName -coords "$nx $ny $info(x) $info(y)"
+
+ blt::FlashPoint $g $info(name) $info(index) 10
+ blt::FlashPoint $g $info(name) [expr $info(index) + 1] 10
+}
+
+proc blt::FlashPoint { g name index count } {
+ if { $count & 1 } {
+ $g element deactivate $name
+ } else {
+ $g element activate $name $index
+ }
+ incr count -1
+ if { $count > 0 } {
+ after 200 blt::FlashPoint $g $name $index $count
+ update
+ } else {
+ catch {eval $g marker delete [$g marker names "bltClosest_*"]}
+ }
+}
+
+
+proc blt::ZoomStack::Init { g } {
+ variable _private
+ set _private($g,interval) 100
+ set _private($g,afterId) 0
+ set _private($g,A,x) {}
+ set _private($g,A,y) {}
+ set _private($g,B,x) {}
+ set _private($g,B,y) {}
+ set _private($g,stack) {}
+ set _private($g,corner) A
+}
+
+proc blt::ZoomStack::ClickClick { g reset } {
+ variable _private
+
+ Init $g
+
+ bind zoom-$g <Enter> "focus %W"
+ bind zoom-$g <KeyPress-Escape> { blt::ZoomStack::Reset %W }
+ bind zoom-$g <ButtonPress-1> { blt::ZoomStack::SetPoint %W %x %y }
+ bind zoom-$g <${reset}> {
+ if { [%W inside %x %y] } {
+ blt::ZoomStack::Reset %W
+ }
+ }
+ blt::AddBindTag $g zoom-$g
+}
+
+proc blt::ZoomStack::ClickRelease { g reset } {
+ variable _private
+
+ Init $g
+ bind zoom-$g <Enter> "focus %W"
+ bind zoom-$g <KeyPress-Escape> {blt::ZoomStack::Reset %W}
+ bind zoom-$g <ButtonPress-1> {blt::ZoomStack::DragStart %W %x %y}
+ bind zoom-$g <B1-Motion> {blt::ZoomStack::DragMotion %W %x %y}
+ bind zoom-$g <ButtonRelease-1> {blt::ZoomStack::DragFinish %W %x %y}
+ bind zoom-$g <${reset}> {
+ if { [%W inside %x %y] } {
+ blt::ZoomStack::Reset %W
+ }
+ }
+ blt::AddBindTag $g zoom-$g
+}
+
+proc blt::ZoomStack::GetCoords { g x y index } {
+ variable _private
+ if { [$g cget -invertxy] } {
+ set _private($g,$index,x) $y
+ set _private($g,$index,y) $x
+ } else {
+ set _private($g,$index,x) $x
+ set _private($g,$index,y) $y
+ }
+}
+
+proc blt::ZoomStack::MarkPoint { g index } {
+ variable _private
+
+ if { [llength [$g xaxis use]] > 0 } {
+ set x [$g xaxis invtransform $_private($g,$index,x)]
+ } else if { [llength [$g x2axis use]] > 0 } {
+ set x [$g x2axis invtransform $_private($g,$index,x)]
+ }
+ if { [llength [$g yaxis use]] > 0 } {
+ set y [$g yaxis invtransform $_private($g,$index,y)]
+ } else if { [llength [$g y2axis use]] > 0 } {
+ set y [$g y2axis invtransform $_private($g,$index,y)]
+ }
+ set marker "zoomText_$index"
+ set text [format "x=%.4g\ny=%.4g" $x $y]
+
+ if [$g marker exists $marker] {
+ $g marker configure $marker -coords "$x $y" -text $text
+ } else {
+ $g marker create text $marker \
+ -coords "$x $y" \
+ -text $text -anchor center -bg {} -justify left
+ }
+}
+
+proc blt::ZoomStack::DestroyTitle { g } {
+ variable _private
+
+ if { $_private($g,corner) == "A" } {
+ catch { $g marker delete "zoomTitle" }
+ }
+}
+
+proc blt::ZoomStack::Pop { g } {
+ variable _private
+
+ set zoomStack $_private($g,stack)
+ if { [llength $zoomStack] > 0 } {
+ set cmd [lindex $zoomStack 0]
+ set _private($g,stack) [lrange $zoomStack 1 end]
+ eval $cmd
+ TitleLast $g
+ update
+ after 2000 [list blt::ZoomStack::DestroyTitle $g]
+ } else {
+ catch { $g marker delete "zoomTitle" }
+ }
+}
+
+# Push the old axis limits on the stack and set the new ones
+
+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"
+ }
+
+ # 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 $max }] != 0 } {
+ return 0
+ }
+ return 1
+}
+
+#
+# This routine terminates either an existing zoom, or pops back to
+# the previous zoom level (if no zoom is in progress).
+#
+proc blt::ZoomStack::Reset { g } {
+ variable _private
+
+ if { ![info exists _private($g,corner)] } {
+ Init $g
+ }
+ catch {eval $g marker delete [$g marker names "zoom*"]}
+
+ if { $_private($g,corner) == "A" } {
+ # Reset the whole axis
+ Pop $g
+ } else {
+ set _private($g,corner) A
+ blt::RemoveBindTag $g select-region-$g
+ }
+}
+
+proc blt::ZoomStack::TitleNext { g } {
+ variable _private
+
+ set level [expr [llength $_private($g,stack)] + 1]
+ if { [$g cget -invertxy] } {
+ set coords "Inf -Inf"
+ } else {
+ set coords "-Inf Inf"
+ }
+ set marker "zoomTitle"
+ if {![$g marker exists $marker]} {
+ $g marker create text $marker -bindtags "" -anchor nw
+ }
+ $g marker configure $marker -text "Zoom #$level" -coords $coords
+}
+
+proc blt::ZoomStack::TitleLast { g } {
+ variable _private
+
+ set level [llength $_private($g,stack)]
+ if { [$g cget -invertxy] } {
+ set coords "Inf -Inf"
+ } else {
+ set coords "-Inf Inf"
+ }
+
+ set marker "zoomTitle"
+ if { $level > 0 } {
+ if {![$g marker exists $marker]} {
+ $g marker create text "zoomTitle" -anchor nw
+ }
+ $g marker configure $marker -text "Zoom #$level" -coords $coords
+ }
+}
+
+
+proc blt::ZoomStack::SetPoint { g x y } {
+ variable _private
+ if { ![info exists _private($g,corner)] } {
+ Init $g
+ }
+ GetCoords $g $x $y $_private($g,corner)
+ bind select-region-$g <Motion> {
+ blt::ZoomStack::GetCoords %W %x %y B
+ #blt::ZoomStack::MarkPoint $g B
+ blt::ZoomStack::Box %W
+ }
+ if { $_private($g,corner) == "A" } {
+ if { ![$g inside $x $y] } {
+ return
+ }
+ # First corner selected, start watching motion events
+
+ #MarkPoint $g A
+ TitleNext $g
+
+ blt::AddBindTag $g select-region-$g
+ set _private($g,corner) B
+ } else {
+ # Delete the modal binding
+ blt::RemoveBindTag $g select-region-$g
+ Push $g
+ set _private($g,corner) A
+ }
+}
+
+proc blt::ZoomStack::DragStart { g x y } {
+ variable _private
+ if { ![info exists _private($g,corner)] } {
+ Init $g
+ }
+ GetCoords $g $x $y A
+ if { ![$g inside $x $y] } {
+ return
+ }
+ set _private(drag) 1
+ TitleNext $g
+}
+
+proc blt::ZoomStack::DragMotion { g x y } {
+ variable _private
+
+ if { $_private(drag) } {
+ GetCoords $g $x $y B
+ set dx [expr abs($_private($g,B,x) - $_private($g,A,x))]
+ set dy [expr abs($_private($g,B,y) - $_private($g,A,y))]
+ Box $g
+ if { $dy > 10 && $dx > 10 } {
+ return 1
+ }
+ }
+ return 0
+}
+
+proc blt::ZoomStack::DragFinish { g x y } {
+ variable _private
+ if { [DragMotion $g $x $y] } {
+ Push $g
+ } else {
+ catch {eval $g marker delete [$g marker names "zoom*"]}
+ if { [info exists _private($g,afterId)] } {
+ after cancel $_private($g,afterId)
+ }
+ }
+ set _private(drag) 0
+}
+
+
+proc blt::ZoomStack::MarchingAnts { g offset } {
+ variable _private
+
+ incr offset
+ # wrap the counter after 2^16
+ set offset [expr $offset & 0xFFFF]
+ if { [$g marker exists zoomOutline] } {
+ $g marker configure zoomOutline -dashoffset $offset
+ set interval $_private($g,interval)
+ set id [after $interval [list blt::ZoomStack::MarchingAnts $g $offset]]
+ set _private($g,afterId) $id
+ }
+}
+
+proc blt::ZoomStack::Box { g } {
+ variable _private
+
+ if { $_private($g,A,x) > $_private($g,B,x) } {
+ set x1 [$g xaxis invtransform $_private($g,B,x)]
+ set y1 [$g yaxis invtransform $_private($g,B,y)]
+ set x2 [$g xaxis invtransform $_private($g,A,x)]
+ set y2 [$g yaxis invtransform $_private($g,A,y)]
+ } else {
+ set x1 [$g xaxis invtransform $_private($g,A,x)]
+ set y1 [$g yaxis invtransform $_private($g,A,y)]
+ set x2 [$g xaxis invtransform $_private($g,B,x)]
+ set y2 [$g yaxis invtransform $_private($g,B,y)]
+ }
+ set coords "$x1 $y1 $x2 $y1 $x2 $y2 $x1 $y2 $x1 $y1"
+ if { [$g marker exists "zoomOutline"] } {
+ $g marker configure "zoomOutline" -coords $coords
+ } else {
+ set X [lindex [$g xaxis use] 0]
+ set Y [lindex [$g yaxis use] 0]
+ $g marker create line "zoomOutline" \
+ -coords $coords -mapx $X -mapy $Y \
+ -dashes 4 -linewidth 1
+ set interval $_private($g,interval)
+ set id [after $interval [list blt::ZoomStack::MarchingAnts $g 0]]
+ set _private($g,afterId) $id
+ }
+}
+
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