Mercurial > hg > svgui
view widgets/WindowShapePreview.cpp @ 333:e74b56f07c73
* Some work on correct alignment when moving panes during playback
* Overhaul alignment for playback frame values (view manager now always
refers to reference-timeline values, only the play source deals in
playback model timeline values)
* When making a selection, ensure the selection regions shown in other
panes (and used for playback constraints if appropriate) are aligned
correctly. This may be the coolest feature ever implemented in any
program ever.
author | Chris Cannam |
---|---|
date | Thu, 22 Nov 2007 14:17:19 +0000 |
parents | cec1f78fbfca |
children | be5c35d3f409 |
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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 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 "WindowShapePreview.h" #include <QHBoxLayout> #include <QLabel> #include <QPainter> #include <QPainterPath> #include <QFont> #include <QString> #include "data/fft/FFTapi.h" #include <iostream> WindowShapePreview::WindowShapePreview(QWidget *parent) : QFrame(parent), m_windowType(WindowType(999)) { QHBoxLayout *layout = new QHBoxLayout; layout->setMargin(0); setLayout(layout); m_windowTimeExampleLabel = new QLabel; m_windowFreqExampleLabel = new QLabel; layout->addWidget(m_windowTimeExampleLabel); layout->addWidget(m_windowFreqExampleLabel); } WindowShapePreview::~WindowShapePreview() { } void WindowShapePreview::updateLabels() { int step = 24; int peak = 48; int w = step * 4, h = 64; WindowType type = m_windowType; Window<float> windower = Window<float>(type, step * 2); QPixmap timeLabel(w, h + 1); timeLabel.fill(Qt::white); QPainter timePainter(&timeLabel); QPainterPath path; path.moveTo(0, h - peak + 1); path.lineTo(w, h - peak + 1); timePainter.setPen(Qt::gray); timePainter.setRenderHint(QPainter::Antialiasing, true); timePainter.drawPath(path); path = QPainterPath(); float acc[w]; for (int i = 0; i < w; ++i) acc[i] = 0.f; for (int j = 0; j < 3; ++j) { for (int i = 0; i < step * 2; ++i) { acc[j * step + i] += windower.getValue(i); } } for (int i = 0; i < w; ++i) { int y = h - int(peak * acc[i] + 0.001) + 1; if (i == 0) path.moveTo(i, y); else path.lineTo(i, y); } timePainter.drawPath(path); timePainter.setRenderHint(QPainter::Antialiasing, false); path = QPainterPath(); timePainter.setPen(Qt::black); for (int i = 0; i < step * 2; ++i) { int y = h - int(peak * windower.getValue(i) + 0.001) + 1; if (i == 0) path.moveTo(i + step, float(y)); else path.lineTo(i + step, float(y)); } if (type == RectangularWindow) { timePainter.drawPath(path); path = QPainterPath(); } timePainter.setRenderHint(QPainter::Antialiasing, true); path.addRect(0, 0, w, h + 1); timePainter.drawPath(path); QFont font; font.setPixelSize(10); font.setItalic(true); timePainter.setFont(font); QString label = tr("V / time"); timePainter.drawText(w - timePainter.fontMetrics().width(label) - 4, timePainter.fontMetrics().ascent() + 1, label); m_windowTimeExampleLabel->setPixmap(timeLabel); int fw = 100; QPixmap freqLabel(fw, h + 1); freqLabel.fill(Qt::white); QPainter freqPainter(&freqLabel); path = QPainterPath(); int fftsize = 512; float *input = (float *)fftf_malloc(fftsize * sizeof(float)); fftf_complex *output = (fftf_complex *)fftf_malloc(fftsize * sizeof(fftf_complex)); fftf_plan plan = fftf_plan_dft_r2c_1d(fftsize, input, output, FFTW_ESTIMATE); for (int i = 0; i < fftsize; ++i) input[i] = 0.f; for (int i = 0; i < step * 2; ++i) { input[fftsize/2 - step + i] = windower.getValue(i); } fftf_execute(plan); fftf_destroy_plan(plan); float maxdb = 0.f; float mindb = 0.f; bool first = true; for (int i = 0; i < fftsize/2; ++i) { float power = output[i][0] * output[i][0] + output[i][1] * output[i][1]; float db = mindb; if (power > 0) { db = 20 * log10(power); if (first || db > maxdb) maxdb = db; if (first || db < mindb) mindb = db; first = false; } } if (mindb > -80.f) mindb = -80.f; // -- no, don't use the actual mindb -- it's easier to compare // plots with a fixed min value mindb = -170.f; float maxval = maxdb + -mindb; // float ly = h - ((-80.f + -mindb) / maxval) * peak + 1; path.moveTo(0, h - peak + 1); path.lineTo(fw, h - peak + 1); freqPainter.setPen(Qt::gray); freqPainter.setRenderHint(QPainter::Antialiasing, true); freqPainter.drawPath(path); path = QPainterPath(); freqPainter.setPen(Qt::black); // std::cerr << "maxdb = " << maxdb << ", mindb = " << mindb << ", maxval = " <<maxval << std::endl; for (int i = 0; i < fftsize/2; ++i) { float power = output[i][0] * output[i][0] + output[i][1] * output[i][1]; float db = 20 * log10(power); float val = db + -mindb; if (val < 0) val = 0; float norm = val / maxval; float x = (fw / float(fftsize/2)) * i; float y = h - norm * peak + 1; if (i == 0) path.moveTo(x, y); else path.lineTo(x, y); } freqPainter.setRenderHint(QPainter::Antialiasing, true); path.addRect(0, 0, fw, h + 1); freqPainter.drawPath(path); fftf_free(input); fftf_free(output); freqPainter.setFont(font); label = tr("dB / freq"); freqPainter.drawText(fw - freqPainter.fontMetrics().width(label) - 4, freqPainter.fontMetrics().ascent() + 1, label); m_windowFreqExampleLabel->setPixmap(freqLabel); } void WindowShapePreview::setWindowType(WindowType type) { if (m_windowType == type) return; m_windowType = type; updateLabels(); }