Mercurial > hg > svgui
view widgets/WindowShapePreview.cpp @ 789:9fd1bdf214dd tonioni
Play pointer: when user drags pane during playback such that the pointer is no longer visible, accept that and stop trying to track it until pointer naturally comes back within visible area
author | Chris Cannam |
---|---|
date | Thu, 12 Jun 2014 12:48:11 +0100 |
parents | 1a0dfcbffaf1 |
children | 4a578a360011 |
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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> #ifndef __GNUC__ #include <alloca.h> #endif 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(); #ifdef __GNUC__ float acc[w]; #else float *acc = (float *)alloca(w * sizeof(float)); #endif 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); // cerr << "maxdb = " << maxdb << ", mindb = " << mindb << ", maxval = " <<maxval << 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(); }