From 979862e2b9679b9ba222c2eae8724558b26fb53c Mon Sep 17 00:00:00 2001
From: Alexander Kojevnikov <alexander@kojevnikov.com>
Date: Thu, 20 Sep 2012 10:44:19 -0700
Subject: [PATCH] Support non-zero upper value in the dynamic range ruler

---
 src/spek-ruler.cc       | 17 +++++++++--------
 src/spek-ruler.hh       |  5 +++--
 src/spek-spectrogram.cc |  5 ++++-
 3 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/src/spek-ruler.cc b/src/spek-ruler.cc
index 0a6464a..93e47de 100644
--- a/src/spek-ruler.cc
+++ b/src/spek-ruler.cc
@@ -22,11 +22,11 @@
 
 SpekRuler::SpekRuler(
     int x, int y, Position pos, wxString sample_label,
-    int *factors, int units, double spacing,
+    int *factors, int min_units, int max_units, double spacing,
     double scale, double offset, formatter_cb formatter)
     :
     x(x), y(y), pos(pos), sample_label(sample_label),
-    factors(factors), units(units), spacing(spacing),
+    factors(factors), min_units(min_units), max_units(max_units), spacing(spacing),
     scale(scale), offset(offset), formatter(formatter)
 {
 }
@@ -47,12 +47,12 @@ void SpekRuler::draw(wxDC& dc)
     }
 
     // Draw the ticks.
-    this->draw_tick(dc, 0);
-    this->draw_tick(dc, units);
+    this->draw_tick(dc, min_units);
+    this->draw_tick(dc, max_units);
 
     if (factor > 0) {
-        for (int tick = factor; tick < units; tick += factor) {
-            if (fabs(this->scale * (units - tick)) < len * 1.2) {
+        for (int tick = min_units + factor; tick < max_units; tick += factor) {
+            if (fabs(this->scale * (max_units - tick)) < len * 1.2) {
                 break;
             }
             this->draw_tick(dc, tick);
@@ -66,8 +66,9 @@ void SpekRuler::draw_tick(wxDC& dc, int tick)
     double TICK_LEN = 4;
 
     wxString label = this->formatter(tick);
-    int value = this->pos == TOP || this->pos == BOTTOM ? tick : this->units - tick;
-    double p = this->offset + this->scale * value;
+    int value = this->pos == TOP || this->pos == BOTTOM ?
+        tick : this->max_units + this->min_units - tick;
+    double p = this->offset + this->scale * (value - min_units);
     wxSize size = dc.GetTextExtent(label);
     int w = size.GetWidth();
     int h = size.GetHeight();
diff --git a/src/spek-ruler.hh b/src/spek-ruler.hh
index a689114..9b5304e 100644
--- a/src/spek-ruler.hh
+++ b/src/spek-ruler.hh
@@ -37,7 +37,7 @@ public:
 
     SpekRuler(
         int x, int y, Position pos, wxString sample_label,
-        int *factors, int units, double spacing,
+        int *factors, int min_units, int max_units, double spacing,
         double scale, double offset, formatter_cb formatter
     );
 
@@ -51,7 +51,8 @@ protected:
     Position pos;
     wxString sample_label;
     int *factors;
-    int units;
+    int min_units;
+    int max_units;
     double spacing;
     double scale;
     double offset;
diff --git a/src/spek-spectrogram.cc b/src/spek-spectrogram.cc
index 10255b3..ac8ced7 100644
--- a/src/spek-spectrogram.cc
+++ b/src/spek-spectrogram.cc
@@ -282,6 +282,7 @@ void SpekSpectrogram::render(wxDC& dc)
                 // TODO: i18n
                 wxT("00:00"),
                 time_factors,
+                0,
                 (int)this->duration,
                 1.5,
                 (w - LPAD - RPAD) / this->duration,
@@ -302,6 +303,7 @@ void SpekSpectrogram::render(wxDC& dc)
                 // TRANSLATORS: keep "00" unchanged, it's used to calc the text width
                 _("00 kHz"),
                 freq_factors,
+                0,
                 freq,
                 3.0,
                 (h - TPAD - BPAD) / (double)freq,
@@ -332,7 +334,8 @@ void SpekSpectrogram::render(wxDC& dc)
             // TRANSLATORS: keep "-00" unchanged, it's used to calc the text width
             _("-00 dB"),
             density_factors,
-            this->urange - this->lrange,
+            -this->urange,
+            -this->lrange,
             3.0,
             (h - TPAD - BPAD) / (double)(this->lrange - this->urange),
             h - TPAD - BPAD,