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line-visualizer: teach draw code how to fill in lines

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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).
This commit is contained in:
Christian Hergert
2017-09-28 13:24:58 -07:00
parent 85ff333491
commit cad87dee49
1 changed files with 28 additions and 4 deletions
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32
lib/sp-line-visualizer-row.c
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@ -72,6 +72,7 @@ typedef struct
GdkRGBA background; GdkRGBA background;
GdkRGBA foreground; GdkRGBA foreground;
guint use_default_style : 1; guint use_default_style : 1;
guint fill : 1;
} LineInfo; } LineInfo;
typedef struct typedef struct
@ -139,12 +140,15 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self); SpLineVisualizerRowPrivate *priv = sp_line_visualizer_row_get_instance_private (self);
GtkStyleContext *style_context; GtkStyleContext *style_context;
GtkStateFlags flags; GtkStateFlags flags;
GtkAllocation alloc;
GdkRGBA foreground; GdkRGBA foreground;
gboolean ret; gboolean ret;
g_assert (SP_IS_LINE_VISUALIZER_ROW (widget)); g_assert (SP_IS_LINE_VISUALIZER_ROW (widget));
g_assert (cr != NULL); g_assert (cr != NULL);
gtk_widget_get_allocation (widget, &alloc);
ret = GTK_WIDGET_CLASS (sp_line_visualizer_row_parent_class)->draw (widget, cr); ret = GTK_WIDGET_CLASS (sp_line_visualizer_row_parent_class)->draw (widget, cr);
if (priv->cache == NULL) 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 LineInfo *line_info = &g_array_index (priv->lines, LineInfo, line);
const Point *fpoints; const Point *fpoints;
guint n_fpoints = 0; guint n_fpoints = 0;
GdkRGBA color;
fpoints = point_cache_get_points (priv->cache, line_info->id, &n_fpoints); 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_x = points[0].x;
last_y = points[0].y; 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++) for (guint i = 1; i < n_fpoints; i++)
{ {
@ -194,14 +207,25 @@ sp_line_visualizer_row_draw (GtkWidget *widget,
last_y = points[i].y; 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); cairo_set_line_width (cr, line_info->line_width);
if (line_info->use_default_style) if (line_info->use_default_style)
gdk_cairo_set_source_rgba (cr, &foreground); color = foreground;
else 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);
} }
} }