From db275d5f5503124d353393d78e899e2ecfdf03c3 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.me.uk>
Date: Tue, 21 Jan 2020 23:29:44 +0100
Subject: Add basic timing ruler

---
 libstorycode/gtk/timing_ruler.c       | 21 ++++++++++++++++++++-
 libstorycode/narrative.c              | 20 ++++++++++++++++++++
 libstorycode/narrative.h              |  2 ++
 libstorycode/narrative_render_cairo.c | 13 +++++++++++++
 libstorycode/narrative_render_cairo.h |  2 ++
 5 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/libstorycode/gtk/timing_ruler.c b/libstorycode/gtk/timing_ruler.c
index 66b925e..6ace1b1 100644
--- a/libstorycode/gtk/timing_ruler.c
+++ b/libstorycode/gtk/timing_ruler.c
@@ -44,7 +44,9 @@ void draw_ruler(cairo_t *cr, GtkNarrativeView *e)
 	int start_item, end_item;
 	int i;
 	double start_item_time = 0.0;
+	double end_item_time = 0.0;
 	double t;
+	double old_y;
 
 	/* Background */
 	cairo_set_source_rgba(cr, 0.9, 0.9, 0.9, 1.0);
@@ -60,7 +62,24 @@ void draw_ruler(cairo_t *cr, GtkNarrativeView *e)
 	}
 	t = start_item_time;
 	for ( i=start_item; i<=end_item; i++ ) {
-		//printf("%4i: %.2f mins\n", i, t);
 		t += e->n->items[i].estd_duration;
 	}
+	end_item_time = t;
+
+	old_y = 0.0;
+	for ( i=start_item_time; i<=end_item_time+1; i++ ) {
+		double y0, y1, y;
+		double yitem = narrative_find_time_pos(e->n, i);
+		y0 = narrative_get_item_y(e->n, yitem);
+		y1 = narrative_get_item_y(e->n, yitem+1);
+		y = y0 + (y1 - y0)*(yitem-trunc(yitem));
+		cairo_rectangle(cr, 0.0, old_y, 100.0, y-old_y);
+		old_y = y;
+		if ( i % 2 ) {
+			cairo_set_source_rgb(cr, 0.9, 0.9, 0.9);
+		} else {
+			cairo_set_source_rgb(cr, 0.8, 0.8, 0.8);
+		}
+		cairo_fill(cr);
+	}
 }
diff --git a/libstorycode/narrative.c b/libstorycode/narrative.c
index c9c94d6..6bedd30 100644
--- a/libstorycode/narrative.c
+++ b/libstorycode/narrative.c
@@ -766,6 +766,26 @@ static double timing_from_wordcount(struct narrative_item *item)
 }
 
 
+/* Find the position (in units of narrative items) of time 'minutes' */
+double narrative_find_time_pos(Narrative *n, double minutes)
+{
+	int i;
+	double t = 0.0;
+
+	if ( minutes == 0.0 ) return 0.0;
+
+	for ( i=0; i<n->n_items; i++ ) {
+		double idur = n->items[i].estd_duration;
+		if ( t + idur > minutes ) {
+			/* It's in this item */
+			return (double)i + (minutes - t)/idur;
+		}
+		t += n->items[i].estd_duration;
+	}
+	return n->n_items;
+}
+
+
 void update_timing(struct narrative_item *item)
 {
 	switch ( item->type ) {
diff --git a/libstorycode/narrative.h b/libstorycode/narrative.h
index 54ad380..6881829 100644
--- a/libstorycode/narrative.h
+++ b/libstorycode/narrative.h
@@ -74,6 +74,8 @@ extern Slide *narrative_get_slide_by_number(Narrative *n, int pos);
 extern int narrative_get_slide_number_for_para(Narrative *n, int para);
 extern int narrative_get_slide_number_for_slide(Narrative *n, Slide *s);
 
+extern double narrative_find_time_pos(Narrative *n, double minutes);
+
 extern char *narrative_range_as_text(Narrative *n, int p1, size_t o1, int p2, size_t o2);
 extern char *narrative_range_as_storycode(Narrative *n, int p1, size_t o1, int p2, size_t o2);
 
diff --git a/libstorycode/narrative_render_cairo.c b/libstorycode/narrative_render_cairo.c
index f23f18c..ee5e67d 100644
--- a/libstorycode/narrative_render_cairo.c
+++ b/libstorycode/narrative_render_cairo.c
@@ -504,6 +504,19 @@ int narrative_render_item_cairo(Narrative*n, cairo_t *cr, int i)
 	return 0;
 }
 
+double narrative_get_item_y(Narrative *n, int item)
+{
+	int i;
+	double y = 0.0;
+
+	if ( item >= n->n_items ) return +INFINITY;
+
+	for ( i=0; i<item; i++ ) {
+		y += narrative_item_get_height(n, i);
+	}
+	return y;
+}
+
 
 /* Given a y-coordinate range, works out which range of items (inclusive)
  * are at least partially within the range */
diff --git a/libstorycode/narrative_render_cairo.h b/libstorycode/narrative_render_cairo.h
index 265b3d9..5c1880f 100644
--- a/libstorycode/narrative_render_cairo.h
+++ b/libstorycode/narrative_render_cairo.h
@@ -55,6 +55,8 @@ extern int narrative_render_cairo(Narrative *n, cairo_t *cr, Stylesheet *stylesh
 
 extern void narrative_sort_positions(struct edit_pos *a, struct edit_pos *b);
 
+extern double narrative_get_item_y(Narrative *n, int item);
+
 extern void narrative_get_item_range(Narrative *n, double min_y, double max_y,
                                      int *start_item, int *end_item);
 
-- 
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