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/usr/share/blt2.5/examples/pareto.tcl is in blt-demo 2.5.3+dfsg-3.

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#!/usr/bin/wish8.6

package require BLT

# --------------------------------------------------------------------------
# Starting with Tcl 8.x, the BLT commands are stored in their own 
# namespace called "blt".  The idea is to prevent name clashes with
# Tcl commands and variables from other packages, such as a "table"
# command in two different packages.  
#
# You can access the BLT commands in a couple of ways.  You can prefix
# all the BLT commands with the namespace qualifier "blt::"
#  
#    blt::graph .g
#    blt::table . .g -resize both
# 
# or you can import all the command into the global namespace.
#
#    namespace import blt::*
#    graph .g
#    table . .g -resize both
#
# --------------------------------------------------------------------------

if { $tcl_version >= 8.0 } {
    namespace import blt::*
    namespace import -force blt::tile::*
}


# Example of a pareto chart.
#
# The pareto chart mixes line and bar elements in the same graph.
# Each processing operating is represented by a bar element.  The
# total accumulated defects is displayed with a single line element.

barchart .b \
    -title "Defects Found During Inspection" \
    -font {Helvetica 12} \
    -plotpady { 12 4 } \
    -width 6i \
    -height 5i 
table . .b -fill both

set data {
    "Spot Weld"		82	yellow
    "Lathe"		49	orange
    "Gear Cut"		38	green
    "Drill"		24	blue
    "Grind"		17	red
    "Lapping"		12	brown
    "Press"		8	purple
    "De-burr"		4	pink
    "Packaging"		3	cyan
    "Other"		12	magenta
}

# Create an X-Y graph line element to trace the accumulated defects.
.b line create accum -label "" -symbol none -color red

# Define a bitmap to be used to stipple the background of each bar.
bitmap define pattern1 { {4 4} {01 02 04 08} }

# For each process, create a bar element to display the magnitude.
set count 0
set sum 0
set ydata 0
set xdata 0
foreach { label value color } $data {
    incr count
    .b element create $label \
	-xdata $count \
	-ydata $value \
	-fg $color \
	-relief solid \
	-borderwidth 1 \
	-stipple pattern1 \
	-bg lightblue 

    set labels($count) $label
    # Get the total number of defects.
    set sum [expr $value + $sum]
    lappend ydata $sum
    lappend xdata $count
}

# Configure the coordinates of the accumulated defects, 
# now that we know what they are.
.b line configure accum -xdata $xdata -ydata $ydata 

# Add text markers to label the percentage of total at each point.
foreach x $xdata y $ydata {
    set percent [expr ($y * 100.0) / $sum]
    if { $x == 0 } {
	set text " 0%"
    } else {
	set text [format %.1f $percent] 
    }
    .b marker create text \
	-coords "$x $y" \
	-text $text \
	-font {Helvetica 10} \
	-fg red4 \
	-anchor c \
	-yoffset -5
}

# Display an auxillary y-axis for percentages.
.b axis configure y2 \
    -hide no \
    -min 0.0 \
    -max 100.0 \
    -title "Percentage"

# Title the y-axis
.b axis configure y -title "Defects"

# Configure the x-axis to display the process names, instead of numbers.
.b axis configure x \
    -title "Process" \
    -command FormatLabels \
    -rotate 90 \
    -subdivisions 0

proc FormatLabels { widget value } {
    global labels
    set value [expr round($value)]
    if {[info exists labels($value)] } {
	return $labels($value)
    }
    return $value
}

# No legend needed.
.b legend configure -hide yes

# Configure the grid lines.
.b grid configure -mapx x -color lightblue