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, 0x00, 0x80 );
42 our $path_color = SDL::Color->new( 0xff, 0xff, 0x80 );
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 $points = $#path + 1 - 4; # remove start/end points
59 my @curve = $curve->curve( $points );
60 debug 'curve' => @curve;
63 while ( $i <= $#curve - 4 ) {
69 sub { $app->pixel( @_, $path_color ) }
78 while ( $event->wait ) {
79 my $type = $event->type();
81 if ( $type == SDL_MOUSEBUTTONDOWN() ) {
82 debug 'mouse down', $event->button_x, $event->button_y;
84 } elsif ( $type == SDL_MOUSEBUTTONUP() ) {
85 debug 'mouse up', $event->button_x, $event->button_y;
88 } elsif ( $type == SDL_QUIT() ) {
90 } elsif ( $type == SDL_KEYDOWN() ) {
91 my $key = $event->key_name;
92 debug 'key down', $key;
93 exit if $key =~ m/^[xq]$/;
94 if ( $key eq 's' ) { # XXX draw curve
96 } elsif ( $key eq 'backspace' ) { # XXX clean screen
98 my $rect = SDL::Rect->new( -x => 0, -y => 0, -w => $w, -h => $h );
99 $app->fill( $rect, $black );
100 $app->update( $rect );
101 } elsif ( $key eq 'd' ) { # XXX toggle debug
103 warn "debug $debug\n";
105 warn "unknown key $key";
107 } elsif ( $type == SDL_KEYUP() ) {
108 debug 'key up', $event->key_name;
109 } elsif ( $type == SDL_MOUSEMOTION() ) {
110 my ( $x, $y ) = ( $event->motion_x, $event->motion_y );
111 #debug 'mouse', $mouse_down, $x, $y;
112 my $d = sqrt( ( $x - $last_x ) ** 2 + ( $y - $last_y ) ** 2 );
113 if ( $mouse_down && $d > $mouse_trashold ) {
114 if ( $#path < $max_path_length ) {
116 my $rect = SDL::Rect->new( -x => $event->motion_x - 1, -y => $event->motion_y -1 , -w => 3, -h => 3 );
117 $app->fill( $rect, $mouse_color );
118 $app->update( $rect );
127 warn "unknown type $type\n";