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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 2006-2007 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 "PaintAssistant.h"
#include "base/AudioLevel.h"
#include <QPaintDevice>
#include <QPainter>
#include <iostream>
#include <cmath>
void
PaintAssistant::paintVerticalLevelScale(QPainter &paint, QRect rect,
double minVal, double maxVal,
Scale scale, int &mult,
std::vector<int> *vy)
{
static double meterdbs[] = { -40, -30, -20, -15, -10,
-5, -3, -2, -1, -0.5, 0 };
int h = rect.height(), w = rect.width();
int textHeight = paint.fontMetrics().height();
int toff = -textHeight/2 + paint.fontMetrics().ascent() + 1;
int lastLabelledY = -1;
int n = 10;
if (vy) vy->clear();
double step = 0;
mult = 1;
if (scale == LinearScale) {
step = (maxVal - minVal) / n;
int round = 0, limit = 10000000;
do {
round = int(minVal + step * mult);
mult *= 10;
} while (!round && mult < limit);
if (round) {
mult /= 10;
// cerr << "\n\nstep goes from " << step;
step = double(round) / mult;
n = int(lrint((maxVal - minVal) / step));
if (mult > 1) {
mult /= 10;
}
// cerr << " to " << step << " (n = " << n << ")" << endl;
}
}
for (int i = 0; i <= n; ++i) {
double val = 0.0, nval = 0.0;
QString text = "";
switch (scale) {
case LinearScale:
val = (minVal + (i * step));
text = QString("%1").arg(mult * val);
break;
case MeterScale: // ... min, max
val = AudioLevel::dB_to_multiplier(meterdbs[i]);
text = QString("%1").arg(meterdbs[i]);
if (i == n) text = "0dB";
if (i == 0) {
text = "-Inf";
val = 0.0;
}
break;
case dBScale: // ... min, max
val = AudioLevel::dB_to_multiplier(-(10*n) + i * 10);
text = QString("%1").arg(-(10*n) + i * 10);
if (i == n) text = "0dB";
if (i == 0) {
text = "-Inf";
val = 0.0;
}
break;
}
if (val < minVal || val > maxVal) continue;
int y = getYForValue(scale, val, minVal, maxVal, rect.y(), h);
int ny = y;
if (nval != 0.0) {
ny = getYForValue(scale, nval, minVal, maxVal, rect.y(), h);
}
// SVDEBUG << "PaintAssistant::paintVerticalLevelScale: val = "
// << val << ", y = " << y << ", h = " << h << endl;
bool spaceForLabel = (i == 0 ||
abs(y - lastLabelledY) >= textHeight - 1);
if (spaceForLabel) {
int tx = 3;
// if (scale != LinearScale) {
if (paint.fontMetrics().width(text) < w - 10) {
tx = w - 10 - paint.fontMetrics().width(text);
}
int ty = y;
if (ty < paint.fontMetrics().ascent()) {
ty = paint.fontMetrics().ascent();
// } else if (ty > rect.y() + h - paint.fontMetrics().descent()) {
// ty = rect.y() + h - paint.fontMetrics().descent();
} else {
ty += toff;
}
paint.drawText(tx, ty, text);
lastLabelledY = ty - toff;
/*
if (ny != y) {
ty = ny;
if (ty < paint.fontMetrics().ascent()) {
ty = paint.fontMetrics().ascent();
} else if (ty > h - paint.fontMetrics().descent()) {
ty = h - paint.fontMetrics().descent();
} else {
ty += toff;
}
paint.drawText(tx, ty, text);
}
*/
paint.drawLine(w - 7, y, w, y);
if (vy) vy->push_back(y);
if (ny != y) {
paint.drawLine(w - 7, ny, w, ny);
if (vy) vy->push_back(ny);
}
} else {
paint.drawLine(w - 4, y, w, y);
if (vy) vy->push_back(y);
if (ny != y) {
paint.drawLine(w - 4, ny, w, ny);
if (vy) vy->push_back(ny);
}
}
}
}
static int
dBscale(double sample, int m, double maxVal, double minVal)
{
if (sample < 0.0) return dBscale(-sample, m, maxVal, minVal);
double dB = AudioLevel::multiplier_to_dB(sample);
double mindB = AudioLevel::multiplier_to_dB(minVal);
double maxdB = AudioLevel::multiplier_to_dB(maxVal);
if (dB < mindB) return 0;
if (dB > 0.0) return m;
return int(((dB - mindB) * m) / (maxdB - mindB) + 0.1);
}
int
PaintAssistant::getYForValue(Scale scale, double value,
double minVal, double maxVal,
int minY, int height)
{
int vy = 0;
// int m = height/2;
// int my = minY + m;
switch (scale) {
case LinearScale:
// vy = my - int(m * value);
vy = minY + height - int(((value - minVal) / (maxVal - minVal)) * height);
break;
case MeterScale:
// vy = my - AudioLevel::multiplier_to_preview(value, m);
vy = minY + height - AudioLevel::multiplier_to_preview
((value - minVal) / (maxVal - minVal), height);
break;
case dBScale:
vy = minY + height - dBscale(value, height, maxVal, minVal);
break;
}
return vy;
}
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