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https://github.com/miek/inspectrum.git
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101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/*
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* Copyright (C) 2015, Mike Walters <mike@flomp.net>
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*
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* This file is part of inspectrum.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "waveformview.h"
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#include <QDebug>
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#include <QPainter>
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#include <gnuradio/top_block.h>
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#include <gnuradio/blocks/multiply_const_cc.h>
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#include "grsamplebuffer.h"
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#include "memory_sink.h"
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#include "memory_source.h"
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WaveformView::WaveformView()
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{
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for (int i = 0; i < 128; i++) {
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colormap[i] = qRgb(i/2, i*1.5, i*1.5);
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}
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for (int i = 128; i < 256; i++) {
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colormap[i] = qRgb(64 + (i-128)*1.5, 192+(i-128)/2, 192+(i-128)/2);
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}
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}
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void WaveformView::inputSourceChanged(AbstractSampleSource *src)
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{
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gr::top_block_sptr tb = gr::make_top_block("multiply");
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auto mem_source = gr::blocks::memory_source::make(8);
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auto mem_sink = gr::blocks::memory_sink::make(8);
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auto multiply = gr::blocks::multiply_const_cc::make(20);
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tb->connect(mem_source, 0, multiply, 0);
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tb->connect(multiply, 0, mem_sink, 0);
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auto derived = dynamic_cast<SampleSource<std::complex<float>>*>(src);
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if (derived == nullptr)
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throw new std::runtime_error("SampleSource doesn't provide correct type for GRSampleBuffer");
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sampleSource = new GRSampleBuffer<std::complex<float>, std::complex<float>>(derived, tb, mem_source, mem_sink);
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update();
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}
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void WaveformView::viewChanged(off_t firstSample, off_t lastSample)
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{
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this->firstSample = firstSample;
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this->lastSample = lastSample;
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qDebug() << "viewChanged(" << firstSample << ", " << lastSample << ")";
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update();
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}
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void WaveformView::paintEvent(QPaintEvent *event)
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{
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if (sampleSource == nullptr) return;
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if (lastSample - firstSample <= 0) return;
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QRect rect = QRect(0, 0, width(), height());
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QPainter painter(this);
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painter.fillRect(rect, Qt::black);
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off_t length = lastSample - firstSample;
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auto samples = dynamic_cast<SampleSource<std::complex<float>>*>(sampleSource)->getSamples(firstSample, length);
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painter.setPen(Qt::red);
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plot(&painter, reinterpret_cast<float*>(samples.get()), length, 2);
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painter.setPen(Qt::blue);
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plot(&painter, reinterpret_cast<float*>(samples.get())+1, length, 2);
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}
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void WaveformView::plot(QPainter *painter, float *samples, off_t count, int step = 1)
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{
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QRect rect = QRect(0, 0, width(), height());
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int xprev = 0;
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int yprev = 0;
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for (off_t i = 0; i < count; i++) {
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float sample = samples[i*step];
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int x = (float)i / count * rect.width();
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int y = (sample * rect.height()/2) + rect.height()/2;
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if (x < 0) x = 0;
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if (y < 0) y = 0;
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if (x >= rect.width()-1) x = rect.width()-2;
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if (y >= rect.height()-1) y = rect.height()-2;
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painter->drawLine(xprev, yprev, x, y);
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xprev = x;
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yprev = y;
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}
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} |