our $mouse_down = 0;
-our $white = SDL::Color->new( 0xff, 0xff, 0xff );
-our $red = SDL::Color->new( 0xff, 0x00, 0x00 );
-our $black = SDL::Color->new( 0x00, 0x00, 0x00 );
+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 {
- return unless $#path > 4;
- my $curve = Math::CatmullRom->new( splice @path, 0, $#path + $#path / 2 );
- my @curve = $curve->curve( $mouse_trashold * 10 );
+ 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 ) {
- my $from_x = int($curve[$i++]);
- my $from_y = int($curve[$i++]);
- my $to_x = int($curve[$i++]);
- my $to_y = int($curve[$i++]);
+ while ( $i <= $#curve - 4 ) {
line(
int($curve[$i++]),
int($curve[$i++]),
int($curve[$i++]),
int($curve[$i++]),
- sub { $app->pixel( @_, $red ) }
+ sub { $app->pixel( @_, $path_color ) }
);
}
$app->sync;
+ reset_path;
}
sub handle_events {
if ( $key eq 's' ) { # XXX draw curve
curve;
} elsif ( $key eq 'backspace' ) { # XXX clean screen
- @path = ();
+ reset_path;
my $rect = SDL::Rect->new( -x => 0, -y => 0, -w => $w, -h => $h );
$app->fill( $rect, $black );
$app->update( $rect );
debug 'key up', $event->key_name;
} elsif ( $type == SDL_MOUSEMOTION() ) {
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 ) ) {
+ #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, $white );
+ $app->fill( $rect, $mouse_color );
$app->update( $rect );
$last_x = $x;
$last_y = $y;