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#!/usr/bin/env tclsh
## -*- tcl -*-
package require Tk
# plotdemos12.tcl --
# Test and demonstrate the interactive facilities of Plotchart
#
package require Plotchart
#
# Procedure for showing the coordinates
#
proc showCoords {xcoord ycoord} {
global coords
set coords "Coordinates: $xcoord, $ycoord"
}
#
# Procedure for showing an annotation
#
proc showAnnotation {xcoord ycoord plot w} {
$plot balloon $xcoord $ycoord "Data point: [format "%.3f, %.3f" $xcoord $ycoord]" north
after 2000 [list removeAnnotation $w]
}
#
# Procedure for erase an annotation
#
proc removeAnnotation {w} {
$w delete BalloonText
$w delete BalloonFrame
}
#
# Create a simple plot and a label
#
pack [canvas .c -bg white] [label .l -textvariable coords]
set p [::Plotchart::createXYPlot .c {0 1000 200} {0 10 1}]
$p dataconfig series1 -type both -symbol cross
foreach x {1 2 5 10 20 50 100 200 500 1000} {
$p plot series1 $x [expr {log($x)}]
$p bindlast series1 <Enter> [list showAnnotation $p %W]
}
$p balloon 20 2 "Text" north
$p title "y = log(x)"
$p bindplot <Motion> showCoords
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