X-Git-Url: http://git.rot13.org/?p=perl-landing-airplanes.git;a=blobdiff_plain;f=trace-path.pl;h=3611481d31779f5f53a2c114127463547c296f98;hp=5f9884ad8cf6a66c3fabc2941d6ea534bffd3aab;hb=27cbedf1109d2d7ecc16c8845b6b94e100b84bde;hpb=009020449eecf3b71c575224c2051e166a17ab53

diff --git a/trace-path.pl b/trace-path.pl
index 5f9884a..3611481 100755
--- a/trace-path.pl
+++ b/trace-path.pl
@@ -9,7 +9,7 @@ use SDL::Color;
 use SDL::Constants;
 use SDL::Event;
 use Math::CatmullRom;
-#use Algorithm::Line::Bresenham;
+use Algorithm::Line::Bresenham qw(line);
 
 use Carp qw(cluck);
 use Data::Dump qw(dump);
@@ -20,12 +20,21 @@ my ( $w, $h ) = ( 800, 480 );
 my $mouse_trashold = 10;
 my $max_path_length = 200;
 
+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 );
+
 sub debug {
 	return unless $debug;
 	my ($package, $filename, $line) = caller;
 	warn '# ', dump( @_ ), " $filename +$line\n";
 }
 
+my $mask = SDL::Surface->new(
+	-name => 'artwork/world1/a-mask.png',
+	-depth => 24,
+);
+
 our $app = SDL::App->new(
 	-width  => $w,
 	-height => $h,
@@ -34,30 +43,85 @@ our $app = SDL::App->new(
 	-title  => 'Trace mouse',
 );
 
+our $app_rect  = SDL::Rect->new( -x => 0, -y => 0, -width => $w, -height => $h );
+$mask->blit( $mask->rect, $app, $app_rect );
+$app->sync;
+
+
+my @landing;
+
+my $mask_step = 10;
+
+my $y = 0;
+foreach ( 0 .. $mask->height / $mask_step ) {
+	printf "%3d: ", $_;
+	my $x = 0;
+	foreach ( 0 .. $mask->width / $mask_step ) {
+		my $col = $mask->pixel( $x, $y );
+		my $nr = 0;
+		$nr += 4 if $col->r;
+		$nr += 2 if $col->g;
+		$nr += 1 if $col->b;
+		$landing[$nr] = [ $x, $y ] unless defined $landing[$nr];
+		printf "%02x%02x%02x:%d ", $col->r, $col->g, $col->b, $nr;
+		$x += $mask_step;
+	}
+	print "\n";
+	$y += $mask_step;
+}
+
+warn 'lading ',dump(@landing);
+
 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;
+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 * $max_path_length / 2 );
+
+	if ( $#path < 1 ) {
+		warn "path too short ", dump @path;
+		reset_path;
+		return;
+	}
+	
+	my $mask_col = $mask->pixel( $path[-2], $path[-1] );
+	my $mask_hex = sprintf '%02x%02x%02x', $mask_col->r, $mask_col->g, $mask_col->b;
+	warn "mask $path[-2] $path[1] $mask_hex\n";
+
+	if ( $mask_hex eq '000000' ) { # push landing point at path end
+		foreach ( 1 .. 6 ) {
+			push @path, $landing[$_]->[0], $landing[$_]->[1];
+		}
+	}
+
+	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 $rect = SDL::Rect->new( -x => int($curve[$i++]), -y => int($curve[$i++]), -w => 1, -h => 1 );
-		$app->fill( $rect, $red );
-		$app->update( $rect );
+	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 {
@@ -71,6 +135,7 @@ sub handle_events {
 		} elsif ( $type == SDL_MOUSEBUTTONUP() ) {
 			debug 'mouse up', $event->button_x, $event->button_y;
 			$mouse_down = 0;
+	
 			curve;
 		} elsif ( $type == SDL_QUIT() ) {
 			exit;
@@ -80,11 +145,12 @@ sub handle_events {
 			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 'backspace' || $key eq 'c' ) { # XXX clean screen
+				reset_path;
+				$app->fill( $app->rect, $black );
+#				$app->update( $rect );
+				$mask->blit( $mask->rect, $app, $app_rect );
+				$app->sync;
 			} elsif ( $key eq 'd' ) { # XXX toggle debug
 				$debug = ! $debug;
 				warn "debug $debug\n";
@@ -95,14 +161,13 @@ sub handle_events {
 			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, -y => $event->motion_y, -w => 3, -h => 3 );
-					$app->fill( $rect, $white );
+					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;