12 use Algorithm::Line::Bresenham qw(line);
15 use Data::Dump qw(dump);
19 my ( $w, $h ) = ( 800, 480 );
20 my $mouse_trashold = 10;
21 my $max_path_length = 200;
25 my ($package, $filename, $line) = caller;
26 warn '# ', dump( @_ ), " $filename +$line\n";
29 our $app = SDL::App->new(
33 # -flags=>SDL_DOUBLEBUF | SDL_HWSURFACE | SDL_HWACCEL,
34 -title => 'Trace mouse',
37 our $event = SDL::Event->new;
41 our $mouse_color = SDL::Color->new( 0x00, 0x80, 0x00 );
42 our $path_color = SDL::Color->new( 0xff, 0x00, 0x00 );
43 our $black = SDL::Color->new( 0x00, 0x00, 0x00 );
45 my ( $last_x, $last_y ) = ( 0,0 );
48 sub reset_path { @path = () }
51 if ( $#path < ( 4 * 2 - 1 ) ) { # less than 4 points
52 warn "path too short ", dump @path;
57 my $curve = Math::CatmullRom->new( @path );
58 my @curve = $curve->curve( $mouse_trashold * 10 );
59 debug 'curve' => @curve;
62 while ( $i < $#curve - 4 ) {
63 my $from_x = int($curve[$i++]);
64 my $from_y = int($curve[$i++]);
65 my $to_x = int($curve[$i++]);
66 my $to_y = int($curve[$i++]);
72 sub { $app->pixel( @_, $path_color ) }
81 while ( $event->wait ) {
82 my $type = $event->type();
84 if ( $type == SDL_MOUSEBUTTONDOWN() ) {
85 debug 'mouse down', $event->button_x, $event->button_y;
87 } elsif ( $type == SDL_MOUSEBUTTONUP() ) {
88 debug 'mouse up', $event->button_x, $event->button_y;
91 } elsif ( $type == SDL_QUIT() ) {
93 } elsif ( $type == SDL_KEYDOWN() ) {
94 my $key = $event->key_name;
95 debug 'key down', $key;
96 exit if $key =~ m/^[xq]$/;
97 if ( $key eq 's' ) { # XXX draw curve
99 } elsif ( $key eq 'backspace' ) { # XXX clean screen
101 my $rect = SDL::Rect->new( -x => 0, -y => 0, -w => $w, -h => $h );
102 $app->fill( $rect, $black );
103 $app->update( $rect );
104 } elsif ( $key eq 'd' ) { # XXX toggle debug
106 warn "debug $debug\n";
108 warn "unknown key $key";
110 } elsif ( $type == SDL_KEYUP() ) {
111 debug 'key up', $event->key_name;
112 } elsif ( $type == SDL_MOUSEMOTION() ) {
113 my ( $x, $y ) = ( $event->motion_x, $event->motion_y );
114 #debug 'mouse', $mouse_down, $x, $y;
115 my $dx = abs( $last_x - $x );
116 my $dy = abs( $last_y - $y );
117 if ( $mouse_down && ( $dx > $mouse_trashold || $dy > $mouse_trashold ) ) {
118 if ( $#path < $max_path_length ) {
120 my $rect = SDL::Rect->new( -x => $event->motion_x - 1, -y => $event->motion_y -1 , -w => 3, -h => 3 );
121 $app->fill( $rect, $mouse_color );
122 $app->update( $rect );
131 warn "unknown type $type\n";