Mercurial > hg > svgui
view layer/LogColourScale.cpp @ 710:c65826b5e980 tonioni
Use sv-dependency-builds on OS/X as well if no config.pri
author | Chris Cannam |
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date | Thu, 09 Jan 2014 09:18:17 +0000 |
parents | 1a1448f7beb2 |
children | 1d526ba11a24 |
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/* -*- 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 2006-2013 Chris Cannam and QMUL. 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 "LogColourScale.h" #include "ColourScaleLayer.h" #include "base/LogRange.h" #include <QPainter> #include <cmath> #include "view/View.h" int LogColourScale::getWidth(View *v, QPainter &paint) { return paint.fontMetrics().width("-000.00") + 15; } void LogColourScale::paintVertical(View *v, const ColourScaleLayer *layer, QPainter &paint, int x0, float minlog, float maxlog) { int h = v->height(); int n = 10; float val = minlog; float inc = (maxlog - val) / n; char buffer[40]; int w = getWidth(v, paint) + x0; int boxx = 5, boxy = 5; if (layer->getScaleUnits() != "") { boxy += paint.fontMetrics().height(); } int boxw = 10, boxh = h - boxy - 5; int tx = 5 + boxx + boxw; paint.drawRect(boxx, boxy, boxw, boxh); paint.save(); for (int y = 0; y < boxh; ++y) { float val = ((boxh - y) * (maxlog - minlog)) / boxh + minlog; paint.setPen(layer->getColourForValue(v, LogRange::unmap(val))); paint.drawLine(boxx + 1, y + boxy + 1, boxx + boxw, y + boxy + 1); } paint.restore(); int dp = 0; if (inc > 0) { int prec = trunc(log10f(inc)); prec -= 1; if (prec < 0) dp = -prec; } for (int i = 0; i < n; ++i) { int y, ty; y = boxy + int(boxh - ((val - minlog) * boxh) / (maxlog - minlog)); ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2; double dv = LogRange::unmap(val); int digits = trunc(log10f(dv)); int sf = dp + (digits > 0 ? digits : 0); if (sf < 2) sf = 2; sprintf(buffer, "%.*g", sf, dv); QString label = QString(buffer); paint.drawLine(boxx + boxw - boxw/3, y, boxx + boxw, y); paint.drawText(tx, ty, label); val += inc; } }