115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
// Author: Max Howell <max.howell@methylblue.com>, (C) 2004
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// Copyright: See COPYING file that comes with this distribution
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#include "boomanalyzer.h"
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#include <cmath>
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#include <QPainter>
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const char* BoomAnalyzer::kName =
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QT_TRANSLATE_NOOP("AnalyzerContainer", "Boom analyzer");
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BoomAnalyzer::BoomAnalyzer(QWidget* parent)
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: Analyzer::Base(parent, 9),
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K_barHeight(1.271) // 1.471
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,
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F_peakSpeed(1.103) // 1.122
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,
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F(1.0),
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bar_height(BAND_COUNT, 0),
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peak_height(BAND_COUNT, 0),
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peak_speed(BAND_COUNT, 0.01),
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barPixmap(COLUMN_WIDTH, 50) {}
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void BoomAnalyzer::changeK_barHeight(int newValue) {
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K_barHeight = (double)newValue / 1000;
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}
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void BoomAnalyzer::changeF_peakSpeed(int newValue) {
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F_peakSpeed = (double)newValue / 1000;
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}
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void BoomAnalyzer::resizeEvent(QResizeEvent*) { init(); }
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void BoomAnalyzer::init() {
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const uint HEIGHT = height() - 2;
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const double h = 1.2 / HEIGHT;
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F = double(HEIGHT) / (log10(256) * 1.1 /*<- max. amplitude*/);
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barPixmap = QPixmap(COLUMN_WIDTH - 2, HEIGHT);
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QPainter p(&barPixmap);
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for (uint y = 0; y < HEIGHT; ++y) {
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const double F = (double)y * h;
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p.setPen(QColor(qMax(0, 255 - int(229.0 * F)),
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qMax(0, 255 - int(229.0 * F)),
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qMax(0, 255 - int(191.0 * F))));
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p.drawLine(0, y, COLUMN_WIDTH - 2, y);
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}
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}
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void BoomAnalyzer::transform(Scope& s) {
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float* front = static_cast<float*>(&s.front());
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m_fht->spectrum(front);
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m_fht->scale(front, 1.0 / 60);
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Scope scope(32, 0);
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const uint xscale[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
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11, 12, 13, 14, 15, 16, 17, 19, 24, 29, 36,
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43, 52, 63, 76, 91, 108, 129, 153, 182, 216, 255};
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for (uint j, i = 0; i < 32; i++)
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for (j = xscale[i]; j < xscale[i + 1]; j++)
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if (s[j] > scope[i]) scope[i] = s[j];
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s = scope;
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}
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void BoomAnalyzer::analyze(QPainter& p, const Scope& scope, bool new_frame) {
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float h;
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const uint MAX_HEIGHT = height() - 1;
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for (uint i = 0, x = 0, y; i < BAND_COUNT; ++i, x += COLUMN_WIDTH + 1) {
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h = log10(scope[i] * 256.0) * F;
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if (h > MAX_HEIGHT) h = MAX_HEIGHT;
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if (h > bar_height[i]) {
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bar_height[i] = h;
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if (h > peak_height[i]) {
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peak_height[i] = h;
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peak_speed[i] = 0.01;
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} else
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goto peak_handling;
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} else {
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if (bar_height[i] > 0.0) {
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bar_height[i] -= K_barHeight; // 1.4
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if (bar_height[i] < 0.0) bar_height[i] = 0.0;
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}
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peak_handling:
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if (peak_height[i] > 0.0) {
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peak_height[i] -= peak_speed[i];
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peak_speed[i] *= F_peakSpeed; // 1.12
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if (peak_height[i] < bar_height[i]) peak_height[i] = bar_height[i];
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if (peak_height[i] < 0.0) peak_height[i] = 0.0;
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}
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}
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y = height() - uint(bar_height[i]);
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p.drawPixmap(x + 1, y, barPixmap, 0, y, -1, -1);
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p.setPen(palette().color(QPalette::Highlight));
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if (bar_height[i] > 0) p.drawRect(x, y, COLUMN_WIDTH - 1, height() - y - 1);
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y = height() - uint(peak_height[i]);
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p.setPen(palette().color(QPalette::Base));
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p.drawLine(x, y, x + COLUMN_WIDTH - 1, y);
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}
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}
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