changeset 224:8ff1ad4e7a9c

* Work on harmonising colour and scale ranges between types of layer
* Add normalize options to colour 3d plot layer

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/LogRange.cpp	Thu Feb 01 14:31:28 2007 +0000
@@ -0,0 +1,60 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include "LogRange.h"
+
+#include <algorithm>
+#include <cmath>
+
+void
+LogRange::mapRange(float &min, float &max, float logthresh)
+{
+    if (min > max) std::swap(min, max);
+    if (max == min) max = min + 1;
+
+    if (min >= 0.f) {
+
+        max = log10f(max); // we know max != 0
+
+        if (min == 0.f) min = std::min(logthresh, max);
+        else min = log10f(min);
+
+    } else if (max <= 0.f) {
+        
+        min = log10f(-min); // we know min != 0
+        
+        if (max == 0.f) max = std::min(logthresh, min);
+        else max = log10f(-max);
+        
+        std::swap(min, max);
+        
+    } else {
+        
+        // min < 0 and max > 0
+        
+        max = log10f(std::max(max, -min));
+        min = std::min(logthresh, max);
+    }
+
+    if (min == max) min = max - 1;
+}        
+
+float
+LogRange::map(float value, float thresh)
+{
+    if (value == 0.f) return thresh;
+    return log10f(fabsf(value));
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/LogRange.h	Thu Feb 01 14:31:28 2007 +0000
@@ -0,0 +1,38 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _LOG_RANGE_H_
+#define _LOG_RANGE_H_
+
+class LogRange
+{
+public:
+    /**
+     * Map a linear range onto a logarithmic range.  min and max are
+     * passed as the extents of the linear range and returned as the
+     * extents of the logarithmic range.  thresh is the minimum value
+     * for the log range, to be used if the linear range spans zero.
+     */
+    static void mapRange(float &min, float &max, float thresh = -10);
+
+    /**
+     * Map a value onto a logarithmic range.  This just means taking
+     * the base-10 log of the absolute value, or using the threshold
+     * value if the absolute value is zero.
+     */
+    static float map(float value, float thresh = -10);
+};
+
+#endif

--- a/base/PropertyContainer.h	Fri Jan 26 16:59:57 2007 +0000
+++ b/base/PropertyContainer.h	Thu Feb 01 14:31:28 2007 +0000
@@ -102,7 +102,7 @@
 
 signals:
     void propertyChanged(PropertyContainer::PropertyName);
-    
+
 public slots:
     /**
      * Set a property.  This is used for all property types.  For

--- a/base/base.pro	Fri Jan 26 16:59:57 2007 +0000
+++ b/base/base.pro	Thu Feb 01 14:31:28 2007 +0000
@@ -19,6 +19,7 @@
            Command.h \
            CommandHistory.h \
            Exceptions.h \
+           LogRange.h \
            Pitch.h \
            PlayParameterRepository.h \
            PlayParameters.h \
@@ -44,6 +45,7 @@
            Command.cpp \
            CommandHistory.cpp \
            Exceptions.cpp \
+           LogRange.cpp \
            Pitch.cpp \
            PlayParameterRepository.cpp \
            PlayParameters.cpp \