svgui
1.9
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ 00002 00003 /* 00004 Sonic Visualiser 00005 An audio file viewer and annotation editor. 00006 Centre for Digital Music, Queen Mary, University of London. 00007 This file copyright 2006-2013 Chris Cannam and QMUL. 00008 00009 This program is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU General Public License as 00011 published by the Free Software Foundation; either version 2 of the 00012 License, or (at your option) any later version. See the file 00013 COPYING included with this distribution for more information. 00014 */ 00015 00016 #include "LogNumericalScale.h" 00017 #include "VerticalScaleLayer.h" 00018 00019 #include "base/LogRange.h" 00020 00021 #include <QPainter> 00022 00023 #include <cmath> 00024 00025 #include "view/View.h" 00026 00027 //#define DEBUG_TIME_VALUE_LAYER 1 00028 00029 int 00030 LogNumericalScale::getWidth(View *, 00031 QPainter &paint) 00032 { 00033 return paint.fontMetrics().width("-000.00") + 10; 00034 } 00035 00036 void 00037 LogNumericalScale::paintVertical(View *v, 00038 const VerticalScaleLayer *layer, 00039 QPainter &paint, 00040 int x0, 00041 float minlog, 00042 float maxlog) 00043 { 00044 int w = getWidth(v, paint) + x0; 00045 00046 int n = 10; 00047 00048 float val = minlog; 00049 float inc = (maxlog - val) / n; // even increments of log scale 00050 00051 // smallest increment as displayed 00052 float minDispInc = LogRange::unmap(minlog + inc) - LogRange::unmap(minlog); 00053 00054 #ifdef DEBUG_TIME_VALUE_LAYER 00055 cerr << "min = " << minlog << ", max = " << maxlog << ", inc = " << inc << ", minDispInc = " << minDispInc << endl; 00056 #endif 00057 00058 char buffer[40]; 00059 00060 float round = 1.f; 00061 int dp = 0; 00062 00063 if (minDispInc > 0) { 00064 int prec = trunc(log10f(minDispInc)); 00065 if (prec < 0) dp = -prec; 00066 round = powf(10.f, prec); 00067 if (dp > 4) dp = 4; 00068 #ifdef DEBUG_TIME_VALUE_LAYER 00069 cerr << "round = " << round << ", prec = " << prec << ", dp = " << dp << endl; 00070 #endif 00071 } 00072 00073 int prevy = -1; 00074 00075 for (int i = 0; i < n; ++i) { 00076 00077 int y, ty; 00078 bool drawText = true; 00079 00080 if (i == n-1 && 00081 v->height() < paint.fontMetrics().height() * (n*2)) { 00082 if (layer->getScaleUnits() != "") drawText = false; 00083 } 00084 00085 float dispval = LogRange::unmap(val); 00086 dispval = floor(dispval / round) * round; 00087 00088 #ifdef DEBUG_TIME_VALUE_LAYER 00089 cerr << "val = " << val << ", dispval = " << dispval << endl; 00090 #endif 00091 00092 y = layer->getYForValue(v, dispval); 00093 00094 ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2; 00095 00096 if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) { 00097 val += inc; 00098 continue; 00099 } 00100 00101 int digits = trunc(log10f(dispval)); 00102 int sf = dp + (digits > 0 ? digits : 0); 00103 if (sf < 4) sf = 4; 00104 #ifdef DEBUG_TIME_VALUE_LAYER 00105 cerr << "sf = " << sf << endl; 00106 #endif 00107 sprintf(buffer, "%.*g", sf, dispval); 00108 00109 QString label = QString(buffer); 00110 00111 paint.drawLine(w - 5, y, w, y); 00112 00113 if (drawText) { 00114 paint.drawText(w - paint.fontMetrics().width(label) - 6, 00115 ty, label); 00116 } 00117 00118 prevy = y; 00119 val += inc; 00120 } 00121 }