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 "LinearNumericalScale.h" 00017 #include "VerticalScaleLayer.h" 00018 00019 #include <QPainter> 00020 00021 #include <cmath> 00022 00023 #include "view/View.h" 00024 00025 int 00026 LinearNumericalScale::getWidth(View *, 00027 QPainter &paint) 00028 { 00029 return paint.fontMetrics().width("-000.00") + 10; 00030 } 00031 00032 void 00033 LinearNumericalScale::paintVertical(View *v, 00034 const VerticalScaleLayer *layer, 00035 QPainter &paint, 00036 int x0, 00037 float minf, 00038 float maxf) 00039 { 00040 int n = 10; 00041 00042 float val = minf; 00043 float inc = (maxf - val) / n; 00044 00045 char buffer[40]; 00046 00047 int w = getWidth(v, paint) + x0; 00048 00049 float round = 1.f; 00050 int dp = 0; 00051 if (inc > 0) { 00052 int prec = trunc(log10f(inc)); 00053 prec -= 1; 00054 if (prec < 0) dp = -prec; 00055 round = powf(10.f, prec); 00056 #ifdef DEBUG_TIME_VALUE_LAYER 00057 cerr << "inc = " << inc << ", round = " << round << ", dp = " << dp << endl; 00058 #endif 00059 } 00060 00061 int prevy = -1; 00062 00063 for (int i = 0; i < n; ++i) { 00064 00065 int y, ty; 00066 bool drawText = true; 00067 00068 float dispval = val; 00069 00070 if (i == n-1 && 00071 v->height() < paint.fontMetrics().height() * (n*2)) { 00072 if (layer->getScaleUnits() != "") drawText = false; 00073 } 00074 dispval = lrintf(val / round) * round; 00075 00076 #ifdef DEBUG_TIME_VALUE_LAYER 00077 cerr << "val = " << val << ", dispval = " << dispval << endl; 00078 #endif 00079 00080 y = layer->getYForValue(v, dispval); 00081 00082 ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2; 00083 00084 if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) { 00085 val += inc; 00086 continue; 00087 } 00088 00089 sprintf(buffer, "%.*f", dp, dispval); 00090 00091 QString label = QString(buffer); 00092 00093 paint.drawLine(w - 5, y, w, y); 00094 00095 if (drawText) { 00096 paint.drawText(w - paint.fontMetrics().width(label) - 6, 00097 ty, label); 00098 } 00099 00100 prevy = y; 00101 val += inc; 00102 } 00103 }