From cad87dee4950141db863026342582f8a6af5b3bc Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Thu, 28 Sep 2017 13:24:58 -0700
Subject: [PATCH] line-visualizer: teach draw code how to fill in lines

We don't expose this via API yet, but it's handy to have it here so we can
build upon it for doing stacked drawings (as useful for things like memory
usage graphs by type).
---
 lib/sp-line-visualizer-row.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/lib/sp-line-visualizer-row.c b/lib/sp-line-visualizer-row.c
index 0a92e5ac..5340f619 100644
--- a/lib/sp-line-visualizer-row.c
+++ b/lib/sp-line-visualizer-row.c
@@ -72,6 +72,7 @@ typedef struct
   GdkRGBA background;
   GdkRGBA foreground;
   guint use_default_style : 1;
+  guint fill : 1;
 } LineInfo;
 
 typedef struct
@@ -139,12 +140,15 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
   SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
   GtkStyleContext *style_context;
   GtkStateFlags flags;
+  GtkAllocation alloc;
   GdkRGBA foreground;
   gboolean ret;
 
   g_assert (SP_IS_LINE_VISUALIZER_ROW (widget));
   g_assert (cr != NULL);
 
+  gtk_widget_get_allocation (widget, &alloc);
+
   ret = GTK_WIDGET_CLASS (sp_line_visualizer_row_parent_class)->draw (widget, cr);
 
   if (priv->cache == NULL)
@@ -160,6 +164,7 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
       const LineInfo *line_info = &g_array_index (priv->lines, LineInfo, line);
       const Point *fpoints;
       guint n_fpoints = 0;
+      GdkRGBA color;
 
       fpoints = point_cache_get_points (priv->cache, line_info->id, &n_fpoints);
 
@@ -179,7 +184,15 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
           last_x = points[0].x;
           last_y = points[0].y;
 
-          cairo_move_to (cr, last_x, last_y);
+          if (line_info->fill)
+            {
+              cairo_move_to (cr, last_x, alloc.height);
+              cairo_line_to (cr, last_x, last_y);
+            }
+          else
+            {
+              cairo_move_to (cr, last_x, last_y);
+            }
 
           for (guint i = 1; i < n_fpoints; i++)
             {
@@ -194,14 +207,25 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
               last_y = points[i].y;
             }
 
+          if (line_info->fill)
+            {
+              cairo_line_to (cr, last_x, alloc.height);
+              cairo_close_path (cr);
+            }
+
           cairo_set_line_width (cr, line_info->line_width);
 
           if (line_info->use_default_style)
-            gdk_cairo_set_source_rgba (cr, &foreground);
+            color = foreground;
           else
-            gdk_cairo_set_source_rgba (cr, &line_info->foreground);
+            color = line_info->foreground;
 
-          cairo_stroke (cr);
+          gdk_cairo_set_source_rgba (cr, &color);
+
+          if (line_info->fill)
+            cairo_fill (cr);
+          else
+            cairo_stroke (cr);
         }
     }