reporting: add graph option: zeroLineColor

doc/dynare.texi

@@ -11239,7 +11239,7 @@ command. Default: @code{`!'}
 @end defmethod
 
 @anchor{addGraph}
-@defmethod Report addGraph data, graphDirName, graphName, graphSize, height, showGrid, showLegend, showLegendBox, legendLocation, legendOrientation, legendFontSize, miscTikzAxisOptions, miscTikzPictureOptions, seriesToUse, shade, shadeColor, shadeOpacity, title, width, xlabel, ylabel, xAxisTight, xrange, xTicks, xTickLabels, xTickLabelAnchor, xTickLabelRotation, yAxisTight, yTickLabelFixed, yTickLabelPrecision, yTickLabelZeroFill, yrange, showZeroline
+@defmethod Report addGraph data, graphDirName, graphName, graphSize, height, showGrid, showLegend, showLegendBox, legendLocation, legendOrientation, legendFontSize, miscTikzAxisOptions, miscTikzPictureOptions, seriesToUse, shade, shadeColor, shadeOpacity, title, width, xlabel, ylabel, xAxisTight, xrange, xTicks, xTickLabels, xTickLabelAnchor, xTickLabelRotation, yAxisTight, yTickLabelFixed, yTickLabelPrecision, yTickLabelZeroFill, yrange, showZeroline, zeroLineColor
 Adds a @code{Graph} to a @code{Section}.
 @optionshead
 @table @code
@@ -11390,9 +11390,14 @@ The precision with which to report the yTickLabel. Default: @code{1}
 @item yTickLabelZeroFill, @code{BOOLEAN}
 Whether or not to fill missing precision spots with zeros. Default: @code{true}
 
+@anchor{showZeroLine}
 @item showZeroline, @code{BOOLEAN}
 Display a solid black line at @math{y = 0}. Default: @code{false}
 
+@item zeroLineColor, @code{`red'} | @code{`green'} | @code{`blue'} | @code{`cyan'} | @code{`magenta'} | @code{`yellow'} | @code{`black'} | @code{`gray'} | @code{`darkgray'} | @code{`lightgray'} | @code{`brown'} | @code{`lime'} | @code{`olive'} | @code{`orange'} | @code{`pink'} | @code{`purple'} | @code{`teal'} | @code{`violet'} | @code{`white'}
+The color to use for the zero line. Only used if @ref{showZeroLine} is
+true. Default: @code{`black'}
+
 @end table
 @end defmethod
 

matlab/reports/@graph/graph.m

@@ -62,6 +62,7 @@ o.legendOrientation = 'horizontal';
 o.legendFontSize = 'tiny';
 
 o.showZeroline = false;
+o.zeroLineColor = 'black';
 
 o.graphSize = [];
 o.xTicks = [];
@@ -132,12 +133,13 @@ assert(ischar(o.xTickLabelAnchor), '@graph.graph: xTickLabelAnchor must be a str
 assert(isint(o.yTickLabelPrecision), '@graph.graph: o.yTickLabelPrecision must be an integer');
 assert(islogical(o.yTickLabelFixed), '@graph.graph: yTickLabelFixed must be either true or false');
 assert(islogical(o.yTickLabelZeroFill), '@graph.graph: yTickLabelZeroFill must be either true or false');
-
 valid_shadeColor = {'red', 'green', 'blue', 'cyan ', 'magenta', 'yellow', ...
                     'black', 'gray', 'darkgray', 'lightgray', 'brown', ...
                     'lime', 'olive', 'orange', 'pink', 'purple', 'teal', 'violet', 'white'};
 assert(any(strcmp(o.shadeColor, valid_shadeColor)), ['@graph.graph: shadeColor must be one of ' ...
         strjoin(valid_shadeColor)]);
+assert(any(strcmp(o.zeroLineColor, valid_shadeColor)), ...
+       ['@graph.graph: zeroLineColor must be one of ' strjoin(valid_shadeColor)]);
 
 valid_legend_locations = ...
     {'south west','south east','north west','north east','outer north east'};

matlab/reports/@graph/writeGraphFile.m

@@ -212,7 +212,8 @@ if ~isempty(o.shade)
 end
 
 if o.showZeroline
-    fprintf(fid, '%%zeroline\n\\addplot[black,line width=.5,forget plot] coordinates {(1,0)(%d,0)};\n',dd.ndat);
+    fprintf(fid, '%%zeroline\n\\addplot[%s,line width=.5,forget plot] coordinates {(1,0)(%d,0)};\n', ...
+        o.zeroLineColor, dd.ndat);
 end
 
 for i=1:ne

tests/reporting/example1.mod

@@ -65,8 +65,9 @@ r = report();
     r = r.addSection('cols', 2);
 @#  for var in endovars
       r = r.addGraph('data', shock@{shock}.@{var}, 'title', '@{var}', ...
-                     'showGrid', false, 'yTickLabelPrecision', 2, 'yTickLabelZeroFill', false);
-      r = r.addSeries('graphHline', 0, 'graphLineColor', 'red');
+                     'showGrid', false, 'yTickLabelPrecision', 2, ...
+                     'yTickLabelZeroFill', false, ...
+                     'showZeroLine', true, 'zeroLineColor', 'red');
 @#  endfor
     r = r.addVspace('number', 2);
     r = r.addSection('cols', 1);