rename colors

[perl-landing-airplanes.git] / trace-path.pl

diff --git a/trace-path.pl b/trace-path.pl
index 8232a2a..05dccdd 100755 (executable)
--- a/trace-path.pl
+++ b/trace-path.pl
@@ -8,11 +8,23 @@ use SDL::Rect;
 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,
@@ -26,7 +38,36 @@ our $event = SDL::Event->new;
 
 our $mouse_down = 0;
 
-our $white = SDL::Color->new( 0xff, 0xff, 0xff );
+our $mouse_color = SDL::Color->new( 0x00, 0x80, 0x00 );
+our $path_color  = SDL::Color->new( 0xff, 0x00, 0x00 );
+our $black       = SDL::Color->new( 0x00, 0x00, 0x00 );
+
+my ( $last_x, $last_y ) = ( 0,0 );
+
+our @path;
+
+sub curve {
+       return unless $#path > 4;
+       my $curve = Math::CatmullRom->new( splice @path, 0, $#path + $#path / 2 );
+       my @curve = $curve->curve( $mouse_trashold * 10 );
+       debug 'curve' => @curve;
+
+       my $i = 0;
+       while ( $i < $#curve ) {
+               my $from_x = int($curve[$i++]);
+               my $from_y = int($curve[$i++]);
+               my $to_x   = int($curve[$i++]);
+               my $to_y   = int($curve[$i++]);
+               line(
+                       int($curve[$i++]),
+                       int($curve[$i++]),
+                       int($curve[$i++]),
+                       int($curve[$i++]),
+                       sub { $app->pixel( @_, $path_color ) }
+               );
+       }
+       $app->sync;
+}
 
 sub handle_events {
 
@@ -34,28 +75,53 @@ sub handle_events {
                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
+                               @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;
-                       warn "mouse $mouse_down @ ", $event->motion_x, ' ', $event->motion_y;
-                       if ( $mouse_down ) {
-                               my $rect = SDL::Rect->new( -x => $event->motion_x, -y => $event->motion_y, -w => 3, -h => 3 );
-                               $app->fill( $rect, $white );
-                               $app->update( $rect );
+                       my ( $x, $y ) = ( $event->motion_x, $event->motion_y );
+                       debug 'mouse', $mouse_down, $x, $y;
+                       my $dx = abs( $last_x - $x );
+                       my $dy = abs( $last_y - $y );
+                       if ( $mouse_down && ( $dx > $mouse_trashold || $dy > $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";
                }
        }
 };