fix Prima able to have multiple "lines" in same plot

lib/PDL/Graphics/Simple/Prima.pm

@@ -269,7 +269,7 @@ sub PDL::Graphics::Simple::Prima::Sepia_Palette::apply {
 # the plot type in terms of others.
 sub _load_types {
   $types = {
-    lines => [ppair::Lines()],
+    lines => 'Lines',
 
     points => [ map ppair->can($_)->(), qw/Blobs Triangles Squares Crosses Xs Asterisks/ ],
 
@@ -457,10 +457,10 @@ sub plot {
     $plot->x->scaling(sc::Log()) if($ipo->{logaxis}=~ m/x/i);
     $plot->y->scaling(sc::Log()) if($ipo->{logaxis}=~ m/y/i);
 
-    $plot->x->min($ipo->{xrange}->[0]) if(defined($ipo->{xrange}) and defined($ipo->{xrange}->[0]));
-    $plot->x->max($ipo->{xrange}->[1]) if(defined($ipo->{xrange}) and defined($ipo->{xrange}->[1]));
-    $plot->y->min($ipo->{yrange}->[0]) if(defined($ipo->{yrange}) and defined($ipo->{yrange}->[0]));
-    $plot->y->max($ipo->{yrange}->[1]) if(defined($ipo->{yrange}) and defined($ipo->{yrange}->[1]));
+    $plot->x->min($ipo->{xrange}[0]) if(defined($ipo->{xrange}) and defined($ipo->{xrange}[0]));
+    $plot->x->max($ipo->{xrange}[1]) if(defined($ipo->{xrange}) and defined($ipo->{xrange}[1]));
+    $plot->y->min($ipo->{yrange}[0]) if(defined($ipo->{yrange}) and defined($ipo->{yrange}[0]));
+    $plot->y->max($ipo->{yrange}[1]) if(defined($ipo->{yrange}) and defined($ipo->{yrange}[1]));
 
     ##############################
     # I couldn't find a way to scale the plot to make the plot area justified, so
@@ -506,7 +506,7 @@ sub plot {
 	my $co = shift @$block;
 
 	# Parse out curve style (for points type selection)
-	if(defined($co->{style}) and $co->{style}) {
+	if ($co->{style}) {
 	    $me->{curvestyle} = $co->{style};
 	} else {
 	    $me->{curvestyle}++;
@@ -524,7 +524,7 @@ sub plot {
 	if( ref($type) eq 'CODE' ) {
 	    $type->($me, $plot, $block, $cprops, $co, $ipo);
 	} else {
-	    my $pt = ref($type) eq 'ARRAY' ? $type->[ ($me->{curvestyle}-1) % (0+@{$type}) ] : eval $type;
+	    my $pt = ref($type) eq 'ARRAY' ? $type->[ ($me->{curvestyle}-1) % (0+@{$type}) ] : ppair->can($type)->();
 	    $plot->dataSets()->{ 1+keys(%{$plot->dataSets()}) } = ds::Pair(@$block, plotType => $pt, @$cprops);
 	}
     }

t/simple.t

@@ -98,6 +98,7 @@ ok( (  defined($mods) and ref $mods eq 'HASH'  ) ,
 # line & bin
 my $x10 = xvals(10);
 my $x10sqrt = $x10->sqrt * sqrt(10);
+my $x10_12 = $x10 * 0.5;
 my $sin10 = sin($x10)*10;
 # errorbars
 my $x37 = xvals(37);
@@ -156,12 +157,13 @@ for my $engine (@engines) {
 {
 my @args = PDL::Graphics::Simple::_translate_plot(@$w{qw(held keys)},
   with=>'line', $x10, $x10sqrt,
+  with=>'line', $x10, $x10_12,
   with=>'bins', $x10, $sin10,
   {title=>"PDL: $engine engine, line & bin plots"}
 );
 delete $args[1]{yrange}; # so different sin can't cause spurious fails
 is_deeply \@args, [
-  [ 'line 1', 'bin 2' ],
+  [ 'line 1', 'line 2', 'bin 3' ],
   {
     'bounds' => undef, 'crange' => undef,
     'justify' => 0, 'legend' => undef,
@@ -174,13 +176,18 @@ is_deeply \@args, [
     { 'key' => undef, 'style' => undef, 'width' => undef, 'with' => 'lines' },
     $x10, $x10sqrt,
   ],
+  [
+    { 'key' => undef, 'style' => undef, 'width' => undef, 'with' => 'lines' },
+    $x10, $x10_12,
+  ],
   [
     { 'key' => undef, 'style' => undef, 'width' => undef, 'with' => 'bins' },
     $x10, $sin10,
   ]
 ];
 }
       eval { $w->plot(with=>'line', $x10, $x10sqrt,
+		      with=>'line', $x10, $x10_12,
 		      with=>'bins', $sin10,
 		 {title=>"PDL: $engine engine, line & bin plots"}),
       };
@@ -357,8 +364,8 @@ is_deeply \@args, [
 
       ask_yn qq{
 Testing $engine engine: You should see in a 3x2 grid:
-1) a superposed line plot and bin plot, with x range from 0 to 9 and
-yrange from 0 to 9. The two plots should have different line styles.
+1) 2 superposed line plots and a bin plot, with x range from 0 to 9 and
+yrange from 0 to 9. The three plots should have different line styles.
 2) error bars (symmetric relative to each plotted point) and limit bars
 (asymmetric about each plotted point).
 3) a radial 11x11 "target" image and some superimposed "circles".