X-Git-Url: http://git.rot13.org/?p=perl-landing-airplanes.git;a=blobdiff_plain;f=trace-path.pl;h=5f9884ad8cf6a66c3fabc2941d6ea534bffd3aab;hp=9a27b35349363a7cf69903e6408cb26cb6e40cfb;hb=009020449eecf3b71c575224c2051e166a17ab53;hpb=bf08ab193ba6aeed8d356123374505f543bb67a0

diff --git a/trace-path.pl b/trace-path.pl
index 9a27b35..5f9884a 100755
--- a/trace-path.pl
+++ b/trace-path.pl
@@ -8,12 +8,23 @@ use SDL::Rect;
 use SDL::Color;
 use SDL::Constants;
 use SDL::Event;
+use Math::CatmullRom;
+#use Algorithm::Line::Bresenham;
 
-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,
@@ -28,42 +39,80 @@ our $event = SDL::Event->new;
 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 );
 
 my ( $last_x, $last_y ) = ( 0,0 );
 
+my @path;
+
+sub curve {
+	return unless $#path > 4;
+	my $curve = Math::CatmullRom->new( splice @path, 0, $#path + $#path / 2 );
+	my @curve = $curve->curve( $mouse_trashold * $max_path_length / 2 );
+	debug 'curve' => @curve;
+
+	my $i = 0;
+	while ( $i < $#curve ) {
+		my $rect = SDL::Rect->new( -x => int($curve[$i++]), -y => int($curve[$i++]), -w => 1, -h => 1 );
+		$app->fill( $rect, $red );
+		$app->update( $rect );
+	}
+}
+
 sub handle_events {
 
 	while ( $event->wait ) {
 		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;
 			my ( $x, $y ) = ( $event->motion_x, $event->motion_y );
-			warn "mouse $mouse_down @ $x*$y\n";
+			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 ) ) {
-				my $rect = SDL::Rect->new( -x => $event->motion_x, -y => $event->motion_y, -w => 3, -h => 3 );
-				$app->fill( $rect, $white );
-				$app->update( $rect );
-				$last_x = $x;
-				$last_y = $y;
+				if ( $#path < $max_path_length ) {
+					push @path, $x, $y;
+					my $rect = SDL::Rect->new( -x => $event->motion_x, -y => $event->motion_y, -w => 3, -h => 3 );
+					$app->fill( $rect, $white );
+					$app->update( $rect );
+					$last_x = $x;
+					$last_y = $y;
+				} else {
+					$mouse_down = 0;
+					curve;
+				}
 			}
 		} else {
-			warn "unknown $type\n";
+			warn "unknown type $type\n";
 		}
 	}
 };