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 "LinearColourScale.h" 00017 #include "ColourScaleLayer.h" 00018 00019 #include <QPainter> 00020 00021 #include <cmath> 00022 00023 #include "view/View.h" 00024 00025 int 00026 LinearColourScale::getWidth(View *, 00027 QPainter &paint) 00028 { 00029 return paint.fontMetrics().width("-000.00") + 15; 00030 } 00031 00032 void 00033 LinearColourScale::paintVertical(View *v, 00034 const ColourScaleLayer *layer, 00035 QPainter &paint, 00036 int /* x0 */, 00037 float min, 00038 float max) 00039 { 00040 int h = v->height(); 00041 00042 int n = 10; 00043 00044 float val = min; 00045 float inc = (max - val) / n; 00046 00047 char buffer[40]; 00048 00049 int boxx = 5, boxy = 5; 00050 if (layer->getScaleUnits() != "") { 00051 boxy += paint.fontMetrics().height(); 00052 } 00053 int boxw = 10, boxh = h - boxy - 5; 00054 00055 int tx = 5 + boxx + boxw; 00056 paint.drawRect(boxx, boxy, boxw, boxh); 00057 00058 paint.save(); 00059 for (int y = 0; y < boxh; ++y) { 00060 float val = ((boxh - y) * (max - min)) / boxh + min; 00061 paint.setPen(layer->getColourForValue(v, val)); 00062 paint.drawLine(boxx + 1, y + boxy + 1, boxx + boxw, y + boxy + 1); 00063 } 00064 paint.restore(); 00065 00066 // float round = 1.f; 00067 int dp = 0; 00068 if (inc > 0) { 00069 int prec = trunc(log10f(inc)); 00070 prec -= 1; 00071 if (prec < 0) dp = -prec; 00072 // round = powf(10.f, prec); 00073 //#ifdef DEBUG_TIME_VALUE_LAYER 00074 // cerr << "inc = " << inc << ", round = " << round << ", dp = " << dp << endl; 00075 //#endif 00076 } 00077 00078 for (int i = 0; i < n; ++i) { 00079 00080 int y, ty; 00081 00082 y = boxy + int(boxh - ((val - min) * boxh) / (max - min)); 00083 00084 ty = y - paint.fontMetrics().height() + 00085 paint.fontMetrics().ascent() + 2; 00086 00087 sprintf(buffer, "%.*f", dp, val); 00088 QString label = QString(buffer); 00089 00090 paint.drawLine(boxx + boxw - boxw/3, y, boxx + boxw, y); 00091 paint.drawText(tx, ty, label); 00092 00093 val += inc; 00094 } 00095 }