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package require BLT
set palette "spectral.rgb"
set mesh [blt::mesh create regular -x "0 100 2" -y "0 100 2"]
set values [blt::vector create]
$values set { 1 1 10 1 }
blt::contour .g -highlightthickness 0
.g element create myContour -mesh $mesh -values $values
.g isoline step 20 -element myContour
.g element configure myContour \
-fill palette \
-outline black
.g legend configure -hide yes
.g axis configure z \
-palette $palette \
-margin right \
-colorbarthickness 20 \
-tickdirection in
foreach key { boundary values symbols isolines colormap symbols wireframe } {
set show($key) [.g element cget myContour -show$key]
}
proc Fix { what } {
global show
set bool $show($what)
.g element configure myContour -show$what $bool
}
blt::tk::checkbutton .boundary -text "Boundary" -variable show(boundary) \
-command "Fix boundary"
blt::tk::checkbutton .wireframe -text "Wireframe" -variable show(wireframe) \
-command "Fix wireframe"
blt::tk::checkbutton .colormap -text "Colormap" \
-variable show(colormap) -command "Fix colormap"
blt::tk::checkbutton .isolines -text "Isolines" \
-variable show(isolines) -command "Fix isolines"
blt::tk::checkbutton .values -text "Values" \
-variable show(values) -command "Fix values"
blt::tk::checkbutton .symbols -text "Symbols" \
-variable show(symbols) -command "Fix symbols"
blt::table . \
0,0 .g -fill both -rowspan 7 \
0,1 .boundary -anchor w \
1,1 .colormap -anchor w \
2,1 .isolines -anchor w \
3,1 .wireframe -anchor w \
4,1 .symbols -anchor w \
5,1 .values -anchor w
blt::table configure . r* c1 -resize none
blt::table configure . r6 -resize both
#Blt_ZoomStack .g
proc FindIsoline { g x y } {
set results [$g isoline nearest $x $y -halo 1i]
set markerName "myMarker"
$g marker delete active
$g isoline deactivate all
if { $results == "" } {
return
}
array set info $results
# --------------------------------------------------------------
# info(name) - element Id
# info(index) - index of closest point
# info(x) find(y) - coordinates of closest point
# or closest point on line segment.
# info(dist) - distance from sample coordinate
# --------------------------------------------------------------
set mesg [format "%s: #%d value=%g\n x=%g y=%g" \
$info(name) $info(index) $info(value) $info(x) $info(y)]
set coords [$g invtransform $x $y]
set nx [lindex $coords 0]
set ny [lindex $coords 1]
set id [$g marker create text \
-coords [list $nx $ny] \
-text $mesg \
-font "Arial 6" \
-anchor center \
-justify left \
-yoffset 0 -bg {}]
$g marker tag add "active" $id
$g isoline activate $info(name)
set id [$g marker create line -coords "$nx $ny $info(x) $info(y)"]
$g marker tag add "active" $id
}
.g isoline bind all <Enter> {
%W isoline deactivate all
%W isoline activate current
}
.g isoline bind all <Leave> {
%W isoline deactivate all
}
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