use SDL::Color;
use SDL::Constants;
use SDL::Event;
+use Math::CatmullRom;
+use Algorithm::Line::Bresenham qw(line);
-use Carp qw/confess/;
-use Data::Dump qw/dump/;
+use Carp qw(cluck);
+use Data::Dump qw(dump);
+
+our $debug = 0;
my ( $w, $h ) = ( 800, 480 );
my $mouse_trashold = 10;
+my $max_path_length = 200;
+
+sub debug {
+ return unless $debug;
+ my ($package, $filename, $line) = caller;
+ warn '# ', dump( @_ ), " $filename +$line\n";
+}
our $app = SDL::App->new(
-width => $w,
our $mouse_down = 0;
-our $white = SDL::Color->new( 0xff, 0xff, 0xff );
+our $mouse_color = SDL::Color->new( 0x00, 0x00, 0x80 );
+our $path_color = SDL::Color->new( 0xff, 0xff, 0x80 );
+our $black = SDL::Color->new( 0x00, 0x00, 0x00 );
my ( $last_x, $last_y ) = ( 0,0 );
+our @path;
+sub reset_path { @path = () }
+
+sub curve {
+ if ( $#path < ( 4 * 2 - 1 ) ) { # less than 4 points
+ warn "path too short ", dump @path;
+ reset_path;
+ return;
+ }
+
+ my $curve = Math::CatmullRom->new( @path );
+ my $points = $#path + 1 - 4; # remove start/end points
+ my @curve = $curve->curve( $points );
+ debug 'curve' => @curve;
+
+ my $i = 0;
+ while ( $i <= $#curve - 4 ) {
+ line(
+ int($curve[$i++]),
+ int($curve[$i++]),
+ int($curve[$i++]),
+ int($curve[$i++]),
+ sub { $app->pixel( @_, $path_color ) }
+ );
+ }
+ $app->sync;
+ reset_path;
+}
+
sub handle_events {
while ( $event->wait ) {
my $type = $event->type();
if ( $type == SDL_MOUSEBUTTONDOWN() ) {
- warn "mouse down ", $event->button_x, ' ', $event->button_y;
+ debug 'mouse down', $event->button_x, $event->button_y;
$mouse_down = 1;
} elsif ( $type == SDL_MOUSEBUTTONUP() ) {
- warn "mouse up ", $event->button_x, ' ', $event->button_y;
+ debug 'mouse up', $event->button_x, $event->button_y;
$mouse_down = 0;
+ curve;
} elsif ( $type == SDL_QUIT() ) {
exit;
} elsif ( $type == SDL_KEYDOWN() ) {
- warn "key down ", $event->key_name,$/;
- exit if $event->key_name =~ m/^[xq]$/;
+ my $key = $event->key_name;
+ debug 'key down', $key;
+ exit if $key =~ m/^[xq]$/;
+ if ( $key eq 's' ) { # XXX draw curve
+ curve;
+ } elsif ( $key eq 'backspace' ) { # XXX clean screen
+ reset_path;
+ my $rect = SDL::Rect->new( -x => 0, -y => 0, -w => $w, -h => $h );
+ $app->fill( $rect, $black );
+ $app->update( $rect );
+ } elsif ( $key eq 'd' ) { # XXX toggle debug
+ $debug = ! $debug;
+ warn "debug $debug\n";
+ } else {
+ warn "unknown key $key";
+ }
} elsif ( $type == SDL_KEYUP() ) {
- warn "key up ", $event->key_name,$/;
+ debug 'key up', $event->key_name;
} elsif ( $type == SDL_MOUSEMOTION() ) {
-# warn "mouse ", $event->motion_xrel, ' ', $event->motion_yrel;
my ( $x, $y ) = ( $event->motion_x, $event->motion_y );
- warn "mouse $mouse_down @ $x*$y\n";
- my $dx = abs( $last_x - $x );
- my $dy = abs( $last_y - $y );
- if ( $mouse_down && ( $dx > $mouse_trashold || $dy > $mouse_trashold ) ) {
- my $rect = SDL::Rect->new( -x => $event->motion_x, -y => $event->motion_y, -w => 3, -h => 3 );
- $app->fill( $rect, $white );
- $app->update( $rect );
- $last_x = $x;
- $last_y = $y;
+ #debug 'mouse', $mouse_down, $x, $y;
+ my $d = sqrt( ( $x - $last_x ) ** 2 + ( $y - $last_y ) ** 2 );
+ if ( $mouse_down && $d > $mouse_trashold ) {
+ if ( $#path < $max_path_length ) {
+ push @path, $x, $y;
+ my $rect = SDL::Rect->new( -x => $event->motion_x - 1, -y => $event->motion_y -1 , -w => 3, -h => 3 );
+ $app->fill( $rect, $mouse_color );
+ $app->update( $rect );
+ $last_x = $x;
+ $last_y = $y;
+ } else {
+ $mouse_down = 0;
+ curve;
+ }
}
} else {
- warn "unknown $type\n";
+ warn "unknown type $type\n";
}
}
};