X-Git-Url: http://git.rot13.org/?p=perl-landing-airplanes.git;a=blobdiff_plain;f=trace-path.pl;h=c0d695daa41c5f5a822f43737f0cd8f1416bcf34;hp=8232a2afe1a49e1cc9aae6c8c2c96cf7876b80ea;hb=46851d0baf6e8a3bb8f6f7580c062590d3c5d35a;hpb=2fd5080d75295ea78cb955b8618afc7d3c44913e

diff --git a/trace-path.pl b/trace-path.pl
index 8232a2a..c0d695d 100755
--- 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 +38,40 @@ our $event = SDL::Event->new;
 
 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 {
 
@@ -34,28 +79,52 @@ 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
+				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;
-			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 $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";
 		}
 	}
 };