X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;ds=sidebyside;f=trace-path.pl;h=5884405ee5906dc308b169e2d0af37ae4ea73f33;hb=45bbd5469d1dd119b8ef6e6c177b9ecc8cb5537d;hp=8232a2afe1a49e1cc9aae6c8c2c96cf7876b80ea;hpb=2fd5080d75295ea78cb955b8618afc7d3c44913e;p=perl-landing-airplanes.git

diff --git a/trace-path.pl b/trace-path.pl
index 8232a2a..5884405 100755
--- a/trace-path.pl
+++ b/trace-path.pl
@@ -8,11 +8,13 @@ use SDL::Rect;
 use SDL::Color;
 use SDL::Constants;
 use SDL::Event;
+use Math::CatmullRom;
 
 use Carp qw/confess/;
 use Data::Dump qw/dump/;
 
 my ( $w, $h ) = ( 800, 480 );
+my $mouse_trashold = 10;
 
 our $app = SDL::App->new(
 	-width  => $w,
@@ -27,6 +29,26 @@ 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 $max_path_length = 100;
+my @path;
+
+sub curve {
+	my $curve = Math::CatmullRom->new( splice @path, 0, $#path + $#path / 2 );
+	my @curve = $curve->curve( $mouse_trashold * $max_path_length );
+	warn "curve ", dump @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 {
 
@@ -42,17 +64,36 @@ sub handle_events {
 		} 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;
+			warn "key down $key\n";
+			exit if $key =~ m/^[xq]$/;
+			if ( $key eq 's' ) {
+				curve;
+			} elsif ( $key eq 'd' ) {
+				@path = ();
+				my $rect = SDL::Rect->new( -x => 0, -y => 0, -w => $w, -h => $h );
+				$app->fill( $rect, $black );
+				$app->update( $rect );
+			}
 		} elsif ( $type == SDL_KEYUP() ) {
 			warn "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 );
+			warn "mouse $mouse_down @ $x*$y\n";
+			my $dx = abs( $last_x - $x );
+			my $dy = abs( $last_y - $y );
+			if ( $mouse_down && ( $dx > $mouse_trashold || $dy > $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 );
+					$app->update( $rect );
+					$last_x = $x;
+					$last_y = $y;
+				} else {
+					$mouse_down = 0;
+				}
 			}
 		} else {
 			warn "unknown $type\n";