From f625d32a6e5393de4757ed930caf5ff802fb2008 Mon Sep 17 00:00:00 2001
From: Alexander Kojevnikov <alexander@kojevnikov.com>
Date: Sun, 16 May 2010 18:11:14 +1000
Subject: [PATCH] Duration ruler (start and end only)

---
 src/spek-source.vala      |  2 ++
 src/spek-spectrogram.vala | 24 +++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/spek-source.vala b/src/spek-source.vala
index cbc308b..48ec70f 100644
--- a/src/spek-source.vala
+++ b/src/spek-source.vala
@@ -27,6 +27,7 @@ namespace Spek {
 		public int threshold { get; construct; }
 		// TODO: file a bug, cannot s/set/construct/
 		public Callback callback {get; set; }
+		public int64 duration { get; private set; }
 
 		public delegate void Callback (int sample, float[] values);
 
@@ -84,6 +85,7 @@ namespace Spek {
 			Format format;
 			int64 duration;
 			query.parse_duration (out format, out duration);
+			this.duration = duration;
 			spectrum.set ("interval", duration / (samples + 1));
 
 			pipeline.set_state (State.PLAYING);
diff --git a/src/spek-spectrogram.vala b/src/spek-spectrogram.vala
index da0cefd..fbf4446 100644
--- a/src/spek-spectrogram.vala
+++ b/src/spek-spectrogram.vala
@@ -108,13 +108,35 @@ namespace Spek {
 			cr.set_source_rgb (0, 0, 0);
 			cr.paint ();
 
-			// Draw the spectrogram.
 			if (image != null) {
+				// Draw the spectrogram.
 				cr.translate (PADDING, h - PADDING);
 				cr.scale (1, -(h - 2 * PADDING) / image.get_height ());
 				cr.set_source_surface (image, 0, 0);
 				cr.paint ();
 				cr.identity_matrix ();
+
+				// Time ruler.
+				int64[] time_points = {0, source.duration};
+				cr.set_source_rgb (1, 1, 1);
+				cr.set_line_width (1);
+				cr.set_antialias (Antialias.NONE);
+				cr.select_font_face ("sans-serif", FontSlant.NORMAL, FontWeight.NORMAL);
+				cr.set_font_size (10.0);
+				TextExtents ext;
+				cr.text_extents ("00:00", out ext);
+				double tick_width = ext.width;
+				foreach (var pt in time_points) {
+					var seconds = (int) (pt / 1000000000);
+					var label = "%d:%02d".printf (seconds / 60, seconds % 60);
+					var pos = PADDING + (w - 2 * PADDING) * pt / source.duration;
+					cr.text_extents (label, out ext);
+					cr.move_to (pos - ext.width / 2, h - PADDING + GAP + ext.height);
+					cr.show_text (label);
+					cr.move_to (pos, h - PADDING);
+					cr.rel_line_to (0, 4);
+					cr.stroke ();
+				}
 			}
 
 			// Border around the spectrogram.