source: branches/blt4/gui/scripts/isomarker.tcl @ 1829

# ----------------------------------------------------------------------
#  COMPONENT: nanovisviewer::isomarker - Marker for 3D volume rendering
#
#  This widget performs volume rendering on 3D scalar/vector datasets.
#  It connects to the Nanovis server running on a rendering farm,
#  transmits data, and displays the results.
# ======================================================================
#  AUTHOR:  Michael McLennan, Purdue University
#  Copyright (c) 2004-2005  Purdue Research Foundation
#
#  See the file "license.terms" for information on usage and
#  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# ======================================================================
package require Itk
package require BLT

itcl::class Rappture::IsoMarker {
    private variable value_     "";     # Absolute value of marker.
    private variable label_     ""
    private variable tick_      ""
    private variable canvas_    ""
    private variable nvobj_     "";     # Parent nanovis object.
    private variable tf_        "";     # Transfer function that this marker is 
                                        # associated with.
    private variable active_motion_   0
    private variable active_press_    0
    private common   normalIcon_ [Rappture::icon nvlegendmark]
    private common   activeIcon_ [Rappture::icon nvlegendmark2]

    constructor {c obj tf args} { 
        set canvas_ $c
        set nvobj_ $obj
        set tf_ $tf
        set w [winfo width $canvas_]
        set h [winfo height $canvas_]
        set tick_ [$c create image 0 $h \
                -image $normalIcon_ -anchor s \
                -tags "$this $obj" -state hidden]
        set label_ [$c create text 0 $h \
                -anchor n -fill white -font "Helvetica 8" \
                -tags "$this $obj" -state hidden]
        $c bind $tick_ <Enter> [itcl::code $this HandleEvent "enter"]
        $c bind $tick_ <Leave> [itcl::code $this HandleEvent "leave"]
        $c bind $tick_ <ButtonPress-1> \
            [itcl::code $this HandleEvent "start" %x %y]
        $c bind $tick_ <B1-Motion> \
            [itcl::code $this HandleEvent "update" %x %y]
        $c bind $tick_ <ButtonRelease-1> \
            [itcl::code $this HandleEvent "end" %x %y]
    }
    destructor { 
        $canvas_ delete $this
    }
    public method transferfunc {} {
        return $tf_
    }
    public method activate { bool } {
        if  { $bool || $active_press_ || $active_motion_ } {
            $canvas_ itemconfigure $label_ -state normal
            $canvas_ itemconfigure $tick_ -image $activeIcon_
        } else {
            $canvas_ itemconfigure $label_ -state hidden
            $canvas_ itemconfigure $tick_ -image $normalIcon_
        }
    }
    public method visible { bool } {
        if { $bool } {
            absval $value_
            $canvas_ itemconfigure $tick_ -state normal
            $canvas_ raise $tick_
        } else {
            $canvas_ itemconfigure $tick_ -state hidden
        }
    }
    public method screenpos { } { 
        set x [relval]
        if { $x < 0.0 } {
            set x 0.0
        } elseif { $x > 1.0 } {
            set x 1.0 
        }
        set low 10 
        set w [winfo width $canvas_]
        set high [expr {$w  - 10}]
        set x [expr {round($x*($high - $low) + $low)}]
        return $x
    }
    public method absval { {x "-get"} } {
        if { $x != "-get" } {
            set value_ $x
            set y 31
            $canvas_ itemconfigure $label_ -text [format %.2g $value_]
            set x [screenpos]
            $canvas_ coords $tick_ $x [expr {$y+3}]
            $canvas_ coords $label_ $x [expr {$y+5}]
        }
        return $value_
    }
    public method relval  { {x "-get"} } {
        if { $x == "-get" } {
            array set limits [$nvobj_ limits $tf_] 
            if { $limits(vmax) == $limits(vmin) } {
                if { $limits(vmax) == 0.0 } {
                    set limits(vmin) 0.0
                    set limits(vmax) 1.0
                } else {
                    set limits(vmax) [expr $limits(vmin) + 1.0]
                }
            }
            return [expr {($value_-$limits(vmin))/
                          ($limits(vmax) - $limits(vmin))}]
        } 
        array set limits [$nvobj_ limits $tf_] 
        if { $limits(vmax) == $limits(vmin) } {
            set limits(min) 0.0
            set limits(max) 1.0
        }
        set r [expr $limits(vmax) - $limits(vmin)]
        absval [expr {($x * $r) + $limits(vmin)}]
    }
    private method HandleEvent { option args } {
        switch -- $option {
            enter {
                set active_motion_ 1
                activate yes
                $canvas_ raise $tick_
            }
            leave {
                set active_motion_ 0
                activate no
            }
            start {
                $canvas_ raise $tick_ 
                set active_press_ 1
                activate yes
                $canvas_ itemconfigure limits -state hidden
            }
            update {
                set w [winfo width $canvas_]
                set x [lindex $args 0]
                relval [expr {double($x-10)/($w-20)}]
                $nvobj_ overmarker $this $x
                $nvobj_ updatetransferfuncs
            }
            end {
                set x [lindex $args 0]
                if { ![$nvobj_ rmdupmarker $this $x]} {
                    eval HandleEvent update $args
                }
                set active_press_ 0
                activate no
                $canvas_ itemconfigure limits -state normal
            }
            default {
                error "bad option \"$option\": should be start, update, end"
            }
        }
    }
}