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|
#!/usr/bin/perl -w
#TITLE: Chart demo
#REQUIRES: Gtk
# chart-demo.pl
#
# Gtk+/Perl chart demo.
#
# 19980813 PMC Created.
#
# Coding and mathematics are horrible, but this is just to demonstrate
# the use of colors and graphics contexts.
#use strict;
use Gtk;
init Gtk;
$pixmapChart = undef;
$width = 600;
$height = 240;
sub do_chart_expose {
my (
$widget,
$event
) = @_;
my (
$event_area
);
$event_area = ${$event}{'area'};
$widget->window->draw_pixmap(
$widget->style->fg_gc('normal'),
$pixmapChart,
${$event_area}[0],
${$event_area}[1],
${$event_area}[0],
${$event_area}[1],
${$event_area}[2],
${$event_area}[3]
);
0;
}
sub draw_chart {
my ( $widget ) = @_;
my ( $margin, $axemargin ) = ( 20, 20 );
my ( $xticks, $yticks, $tickwidth ) = ( 10, 24, 5 );
my $steps = 90;
my ( $step );
my ( $tick);
my $red_gc = new Gtk::Gdk::GC ( $widget->window );
my $green_gc = new Gtk::Gdk::GC ( $widget->window );
my $blue_gc = new Gtk::Gdk::GC ( $widget->window );
my $red_color = $widget->window->get_colormap->color_alloc( { red => 65000, green => 0, blue => 0 } );
my $green_color = $widget->window->get_colormap->color_alloc( { red => 0, green => 65000, blue => 0 } );
my $blue_color = $widget->window->get_colormap->color_alloc( { red => 0, green => 0, blue => 65000 } );
$red_gc->set_foreground( $red_color );
$green_gc->set_foreground( $green_color );
$blue_gc->set_foreground( $blue_color );
$pixmapChart = new Gtk::Gdk::Pixmap (
$widget->window,
$width,
$height,
-1
);
# clear the pixmap to white
$pixmapChart->draw_rectangle(
$widget->style->white_gc,
1,
0,
0,
$width,
$height
);
$pixmapChart->draw_line(
$blue_gc,
$margin,
$height - $margin - $axemargin,
$width - $margin,
$height - $margin - $axemargin
);
$pixmapChart->draw_line(
$blue_gc,
$margin + $axemargin,
$margin,
$margin + $axemargin,
$height - $margin
);
$tickstep = ( $height - ( $margin * 2 ) - ( $axemargin * 2 ) ) / $xticks;
for $tick ( 1 .. $xticks ) {
$pixmapChart->draw_line(
$red_gc,
$margin + $axemargin - $tickwidth,
$height - $margin - $axemargin - ( $tick * $tickstep ),
$margin + $axemargin,
$height - $margin - $axemargin - ( $tick * $tickstep )
);
}
$tickstep = ( $width - ( $margin * 2 ) - ( $axemargin * 2 ) ) / $yticks;
for $tick ( 1 .. $yticks ) {
$pixmapChart->draw_line(
$red_gc,
$margin + $axemargin + ( $tick * $tickstep ),
$height - $margin - $axemargin,
$margin + $axemargin + ( $tick * $tickstep ),
$height - $margin - $axemargin + $tickwidth
);
}
$range = $width - 2 * $margin - 2 * $axemargin;
$center = $height / 2;
$old = $center;
for $step ( 1 .. $range ) {
$new = 3.14 / ( $range / 2 - $step + 0.000000001 ) * 20 + $center;
if ( $new > ( $height - $margin - $axemargin ) ) {
$new = $margin + $axemargin;
}
$pixmapChart->draw_line(
$green_gc,
$margin + $axemargin + $step,
$old,
$margin + $axemargin + $step + 1,
$new
);
$old = $new;
}
}
# main
my (
$windowMain,
$vboxMain,
$dareaChart
);
$windowMain = new Gtk::Window( 'toplevel' );
$windowMain->signal_connect( 'destroy', sub { Gtk::main_quit( Gtk ); } );
$windowMain->set_title( 'Chart drawing' );
$windowMain->border_width( 0 );
$vboxMain = new Gtk::VBox ( 0, 0 );
$vboxMain->border_width( 10 );
$windowMain->add( $vboxMain );
$vboxMain->show;
$dareaChart = new Gtk::DrawingArea;
$dareaChart->signal_connect( 'expose_event', \&do_chart_expose );
$dareaChart->size( $width, $height );
$vboxMain->pack_start( $dareaChart, 1, 1, 0 );
$dareaChart->set_events( [ 'exposure_mask' ] );
$dareaChart->show;
$dareaChart->realize;
draw_chart ( $dareaChart );
$windowMain->show;
Gtk::main( Gtk );
# end
|
