From 020762baaeea7a0d4509fb03cf33ef92399cc600 Mon Sep 17 00:00:00 2001
From: mertz
Date: Tue, 8 Jul 2003 12:41:25 +0000
Subject: Zetris now works even without openGL. It is just ugly!

---
 Perl/demos/Tk/demos/zinc_lib/Zetris.pl | 40 ++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 14 deletions(-)

(limited to 'Perl/demos')

diff --git a/Perl/demos/Tk/demos/zinc_lib/Zetris.pl b/Perl/demos/Tk/demos/zinc_lib/Zetris.pl
index f9e239f..f99778b 100644
--- a/Perl/demos/Tk/demos/zinc_lib/Zetris.pl
+++ b/Perl/demos/Tk/demos/zinc_lib/Zetris.pl
@@ -30,13 +30,13 @@
 #
 #  - This TkTetris-like uses a tk widget similar to the canvas
 #    and called "Zinc". Zinc bring to Tk widgets openGL features
-#    like transparency, color gradiants, scaling.
-#    So to use Zetris you need openGL capability.
+#    like transparency, color gradients, scaling.
+#    So to use Zetris graphic enhancement, you need openGL capability.
 #    Zinc comes with other features like grouping and clipping.
 #
-#  - A color gradiant is used for Zetris background,
+#  - A color gradient is used for Zetris background,
 #
-#  - Zetris balls are filled with transparently color gradiants,
+#  - Zetris balls are filled with transparently color gradients,
 #    (transparency is visible when balls fall over TkZinc logo)
 #
 #  - Zetris balls have a little transparent shadow,
@@ -47,10 +47,11 @@
 #    This feature is particularly useful for applying transformations,
 #
 #  - The TkZinc logo over background isn't an image but only curves
-#    and color gradiants (made by <vinot@cena.fr>)
+#    and color gradients (made by <vinot@cena.fr>)
 #
 #  - Please feel free to provide any feedback to <buisson@cena.fr>
-#
+#  
+#  - CM: Zetris now works even without openGL. It is just ugly!
 #
 #------------------------------------------------------------------------------
 
@@ -233,7 +234,12 @@ my $tetris = $top->Zinc(-width  => $step_x*($width-2),
 			-lightangle => 130,
 			-render => 1,
 		       )->pack;
-die "no openGL rendering on this X server" unless $tetris->cget(-render);
+
+# Zetris will no more die if there is no openGL render. I did some minor
+# modification (transparency, item priority) to make all needed item
+# visible, even without alpha-transparency
+
+my $render = $tetris->cget(-render);
 
 my $shadow_group = $tetris->add('group',1, -visible => 1);
 
@@ -249,7 +255,7 @@ $tetris->add('rectangle',
 	     [0, 0,$step_x*($width-2) ,$step_y*($height-1)] ,
 	     -filled => 1,
 	     -linewidth => 0,
-	     -fillcolor  => "=axial 90 |black;40|gray80;60",
+	     -fillcolor  => $render ? "=axial 90 |black;40|gray80;60" : "grey80",
 	     -visible => 1);
 
 my $group = $tetris->add('group', 1, );
@@ -259,7 +265,7 @@ my $logo = Tk::Zinc::Logo->new(-widget => $tetris,
 					     $step_y*($height-1)/2],
 			       );
 
-$tetris->lower($group);
+$tetris->lower($group) if $render;
 
 my $score_group = $tetris->add('group',1, -visible => 1);
 my $new = $tetris->add('text',$score_group,
@@ -268,8 +274,14 @@ my $new = $tetris->add('text',$score_group,
 		       -font => $basefont->($fontheight),
 		       -position => [$width-2,10],
 		      );
+$tetris->add('text',$score_group,
+		       -text => "Sorry, without openGL,\nZtetris is just ugly.",
+		       #-anchor => 'e',
+		       -font => $basefont->($fontheight),
+		       -position => [$width-2,100],
+	     ) if !$render;
 
-$tetris->lower($score_group);
+$tetris->lower($score_group) if $render;
 
 my $timer = $top->after(speed(), sub {
 			  $old_win_height = $top->height;
@@ -545,17 +557,16 @@ sub rectangle
       {
 	my($xx, $yy);
 	($xx, $yy) = (($x-1)*$step_x, $y*$step_y);
-	my $dark_color;
-	$dark_color = $color_dark{$mode};
 	my $color = $color_bright{$mode};
 	# Adding new Zinc item : ball shadow
 	my $ombre=$zinc->add(
 			     'arc',$shadow_group,[$xx+10,$yy+10,$xx+$boxsize_x+10,$yy+$boxsize_y+10],
 			     -visible=>1,
 			     -filled=>1,
-			     -fillcolor => "=path 50 50 |black;100 0|black;80 20|black;0 100", # color gradiant
+			     -fillcolor => $render ? "=path 50 50 |black;100 0|black;80 20|black;0 100" : "grey90", # color gradiant
 			     -linewidth => 0,
 			     -linecolor => 'yellow',
+			     -priority => $render ? 6 : 10,
 			     -tags => ["ombre$x-$y"]);
 	
 	$zinc->itemconfigure($shadow_group, -priority => 2);
@@ -565,8 +576,9 @@ sub rectangle
 			      'arc',$topgroup,[$xx,$yy,$xx+$boxsize_x,$yy+$boxsize_y],
 			      -visible=>1,
 			      -filled=>1,
-			      -fillcolor => "=radial -20 -20 |white;90|$color;90" ,
+			      -fillcolor => $render ? "=radial -20 -20 |white;90|$color;90" : $color,
 			      -linewidth => 1,
+			      -priority => 5,
 			      -linecolor => "$color;80",
 			      -tags => ["$x-$y"]);
       }
-- 
cgit v1.1