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sdrangel/sdrgui/gui/scaleengine.cpp

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C++
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel //
// //
// 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 as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <math.h>
#include <QObject>
#include <QFontMetrics>
#include <QDataStream>
#include "gui/scaleengine.h"
/*
static double trunc(double d)
{
return (d > 0) ? floor(d) : ceil(d);
}
*/
QString ScaleEngine::formatTick(double value, int decimalPlaces)
{
if (m_physicalUnit != Unit::TimeHMS)
{
if (m_physicalUnit == Unit::Scientific) {
return QString("%1").arg(m_makeOpposite ? -value : value, 0, 'e', m_fixedDecimalPlaces);
} else {
return QString("%1%2%3")
.arg(m_truncated ? "'" : "")
.arg(m_makeOpposite ? -value : value, 0, 'f', decimalPlaces)
.arg(m_truncated ? m_multiplierStr : "");
}
}
else
{
if (m_scale < 1.0f) { // sub second prints just as is
return QString("%1").arg(m_makeOpposite ? -value : value, 0, 'f', decimalPlaces);
}
QString str;
double actual = value * m_scale; // this is the actual value in seconds
double orig = fabs(actual);
double tmp;
if (m_truncated) {
str = "'";
}
if (orig >= 86400.0)
{
tmp = floor(actual / 86400.0);
str += QString("%1.").arg(tmp, 0, 'f', 0);
actual -= tmp * 86400.0;
if (actual < 0.0) {
actual *= -1.0;
}
}
if (orig >= 3600.0)
{
tmp = floor(actual / 3600.0);
str += QString("%1:").arg(tmp, 2, 'f', 0, QChar('0'));
actual -= tmp * 3600.0;
if (actual < 0.0) {
actual *= -1.0;
}
}
if (orig >= 60.0)
{
tmp = floor(actual / 60.0);
str += QString("%1:").arg(tmp, 2, 'f', 0, QChar('0'));
actual -= tmp * 60.0;
if (actual < 0.0) {
actual *= -1.0;
}
}
tmp = m_makeOpposite ? -actual : actual;
str += QString("%1").arg(tmp, 2, 'f', decimalPlaces, QChar('0'));
return str;
}
}
void ScaleEngine::calcCharSize()
{
QFontMetricsF fontMetrics(m_font);
if(m_orientation == Qt::Vertical) {
m_charSize = fontMetrics.height();
} else {
QString str("012345679.,-");
int i;
float size;
float max = 0.0f;
for(i = 0; i < str.length(); i++) {
size = fontMetrics.horizontalAdvance(QString(str[i]));
if(size > max)
max = size;
}
m_charSize = max;
}
}
void ScaleEngine::calcScaleFactor()
{
double median, range, freqBase;
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
median = ((rangeMax - rangeMin) / 2.0) + rangeMin;
range = (rangeMax - rangeMin);
freqBase = (median == 0 ? range : median);
m_scale = 1.0;
m_multiplierStr.clear();
switch(m_physicalUnit) {
case Unit::None:
case Unit::Scientific:
m_unitStr.clear();
break;
case Unit::Frequency:
if(freqBase < 1000.0) {
m_unitStr = QObject::tr("Hz");
m_multiplierStr = "";
} else if(freqBase < 1000000.0) {
m_unitStr = QObject::tr("kHz");
m_multiplierStr = "k";
m_scale = 1000.0;
} else if(freqBase < 1000000000.0) {
m_unitStr = QObject::tr("MHz");
m_multiplierStr = "M";
m_scale = 1000000.0;
} else if(freqBase < 1000000000000.0){
m_unitStr = QObject::tr("GHz");
m_multiplierStr = "G";
m_scale = 1000000000.0;
} else {
m_unitStr = QObject::tr("THz");
m_multiplierStr = "T";
m_scale = 1000000000000.0;
}
break;
case Unit::Information:
if(median < 1024.0) {
m_unitStr = QObject::tr("Bytes");
m_multiplierStr = "";
} else if(median < 1048576.0) {
m_unitStr = QObject::tr("KiBytes");
m_multiplierStr = "k";
m_scale = 1024.0;
} else if(median < 1073741824.0) {
m_unitStr = QObject::tr("MiBytes");
m_multiplierStr = "M";
m_scale = 1048576.0;
} else if(median < 1099511627776.0) {
m_unitStr = QObject::tr("GiBytes");
m_multiplierStr = "G";
m_scale = 1073741824.0;
} else if(median < 1125899906842624.0) {
m_unitStr = QObject::tr("TiBytes");
m_multiplierStr = "T";
m_scale = 1099511627776.0;
} else {
m_unitStr = QObject::tr("PiBytes");
m_multiplierStr = "P";
m_scale = 1125899906842624.0;
}
break;
case Unit::Percent:
m_unitStr = QString("%");
break;
case Unit::Decibel:
m_unitStr = QString("dB");
break;
case Unit::DecibelMilliWatt:
m_unitStr = QString("dBm");
break;
case Unit::DecibelMicroVolt:
m_unitStr = QString("dBµV");
break;
case Unit::AngleDegrees:
m_unitStr = QString("°");
break;
case Unit::Time:
case Unit::TimeHMS:
if (median < 0.001) {
m_unitStr = QString("µs");
m_multiplierStr = "µ";
m_scale = 0.000001;
} else if (median < 1.0) {
m_unitStr = QString("ms");
m_multiplierStr = "m";
m_scale = 0.001;
} else if (median < 1000.0) {
m_unitStr = QString("s");
m_multiplierStr = "";
} else {
m_unitStr = QString("ks");
m_multiplierStr = "k";
m_scale = 1000.0;
}
break;
case Unit::Volt:
if (median < 1e-9) {
m_unitStr = QString("pV");
m_multiplierStr = "p";
m_scale = 1e-12;
} else if (median < 1e-6) {
m_unitStr = QString("nV");
m_multiplierStr = "n";
m_scale = 1e-9;
} else if (median < 1e-3) {
m_unitStr = QString("µV");
m_multiplierStr = "µ";
m_scale = 1e-6;
} else if (median < 1.0) {
m_unitStr = QString("mV");
m_multiplierStr = "m";
m_scale = 1e-3;
} else {
m_unitStr = QString("V");
m_multiplierStr = "";
}
break;
}
}
double ScaleEngine::calcMajorTickUnits(double distance, int* retDecimalPlaces)
{
double sign;
double log10x;
double exponent;
double base;
int decimalPlaces;
if(distance == 0.0)
return 0.0;
sign = (distance > 0.0) ? 1.0 : -1.0;
log10x = log10(fabs(distance));
exponent = floor(log10x);
base = pow(10.0, log10x - exponent);
decimalPlaces = (int)(-exponent);
/*
if((m_physicalUnit == Unit::Time) && (distance >= 1.0)) {
if(retDecimalPlaces != NULL)
*retDecimalPlaces = 0;
if(distance < 1.0)
return 1.0;
else if(distance < 5.0)
return 5.0;
else if(distance < 10.0)
return 10.0;
else if(distance < 15.0)
return 15.0;
else if(distance < 30.0)
return 30.0;
else if(distance < 60.0)
return 60.0;
else if(distance < 5.0 * 60.0)
return 5.0 * 60.0;
else if(distance < 10.0 * 60.0)
return 10.0 * 60.0;
else if(distance < 15.0 * 60.0)
return 15.0 * 60.0;
else if(distance < 30.0 * 60.0)
return 30.0 * 60.0;
else if(distance < 3600.0)
return 3600.0;
else if(distance < 2.0 * 3600.0)
return 2.0 * 3600.0;
else if(distance < 3.0 * 3600.0)
return 3.0 * 3600.0;
else if(distance < 6.0 * 3600.0)
return 6.0 * 3600.0;
else if(distance < 12.0 * 3600.0)
return 12.0 * 3600.0;
else if(distance < 86000.0)
return 86000.0;
else if(distance < 2.0 * 86000.0)
return 2.0 * 86000.0;
else if(distance < 7.0 * 86000.0)
return 7.0 * 86000.0;
else if(distance < 10.0 * 86000.0)
return 10.0 * 86000.0;
else if(distance < 30.0 * 86000.0)
return 30.0 * 86000.0;
else return 90.0 * 86000.0;
} */
if(base <= 1.0) {
base = 1.0;
} else if(base <= 2.0) {
base = 2.0;
} else if(base <= 2.5) {
base = 2.5;
if(decimalPlaces >= 0)
decimalPlaces++;
} else if(base <= 5.0) {
base = 5.0;
} else {
base = 10.0;
}
if(retDecimalPlaces != 0) {
if(decimalPlaces < 0)
decimalPlaces = 0;
*retDecimalPlaces = decimalPlaces;
}
return sign * base * pow(10.0, exponent);
}
int ScaleEngine::calcTickTextSize(double distance)
{
int tmp;
int tickLen;
int decimalPlaces;
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
tickLen = 1;
tmp = formatTick(rangeMin / m_scale, 0).length();
if(tmp > tickLen)
tickLen = tmp;
tmp = formatTick(rangeMax / m_scale, 0).length();
if(tmp > tickLen)
tickLen = tmp;
calcMajorTickUnits(distance, &decimalPlaces);
return tickLen + decimalPlaces + 1;
}
void ScaleEngine::forceTwoTicks()
{
Tick tick;
QFontMetricsF fontMetrics(m_font);
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
m_tickList.clear();
tick.major = true;
tick.pos = getPosFromValueTrunc(rangeMin);
tick.text = formatTick(rangeMin / m_scale, m_decimalPlaces);
tick.textSize = fontMetrics.boundingRect(tick.text).width();
if(m_orientation == Qt::Vertical)
tick.textPos = tick.pos - fontMetrics.ascent() / 2;
else tick.textPos = tick.pos - fontMetrics.boundingRect(tick.text).width() / 2;
m_tickList.append(tick);
tick.pos = getPosFromValueTrunc(rangeMax);
tick.text = formatTick(rangeMax / m_scale, m_decimalPlaces);
tick.textSize = fontMetrics.boundingRect(tick.text).width();
if(m_orientation == Qt::Vertical)
tick.textPos = tick.pos - fontMetrics.ascent() / 2;
else tick.textPos = tick.pos - fontMetrics.boundingRect(tick.text).width() / 2;
m_tickList.append(tick);
}
void ScaleEngine::reCalc()
{
float majorTickSize;
double rangeMinScaled;
double rangeMaxScaled;
int maxNumMajorTicks;
int numMajorTicks;
int step;
int skip;
double value;
double value2;
int i;
int j;
Tick tick;
float pos;
QString str;
QFontMetricsF fontMetrics(m_font);
float endPos;
float lastEndPos;
bool done;
if (!m_recalc) {
return;
}
updateTruncation();
m_recalc = false;
m_tickList.clear();
calcScaleFactor();
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
rangeMinScaled = rangeMin / m_scale;
rangeMaxScaled = rangeMax / m_scale;
if(m_orientation == Qt::Vertical)
{
maxNumMajorTicks = (int)(m_size / (fontMetrics.lineSpacing() * 1.3f));
m_majorTickValueDistance = calcMajorTickUnits((rangeMaxScaled - rangeMinScaled) / maxNumMajorTicks, &m_decimalPlaces);
}
else
{
majorTickSize = (calcTickTextSize((rangeMaxScaled - rangeMinScaled) / 20) + 2) * m_charSize;
if(majorTickSize != 0.0) {
maxNumMajorTicks = (int)(m_size / majorTickSize);
} else {
maxNumMajorTicks = 20;
}
m_majorTickValueDistance = calcMajorTickUnits((rangeMaxScaled - rangeMinScaled) / maxNumMajorTicks, &m_decimalPlaces);
}
numMajorTicks = (int)((rangeMaxScaled - rangeMinScaled) / m_majorTickValueDistance);
if(numMajorTicks == 0) {
forceTwoTicks();
return;
}
if(maxNumMajorTicks > 0)
m_numMinorTicks = (int)(m_size / (maxNumMajorTicks * fontMetrics.height()));
else m_numMinorTicks = 0;
if(m_numMinorTicks < 1)
m_numMinorTicks = 0;
else if(m_numMinorTicks < 2)
m_numMinorTicks = 1;
else if(m_numMinorTicks < 5)
m_numMinorTicks = 2;
else if(m_numMinorTicks < 10)
m_numMinorTicks = 5;
else m_numMinorTicks = 10;
m_firstMajorTickValue = floor(rangeMinScaled / m_majorTickValueDistance) * m_majorTickValueDistance;
skip = 0;
if(rangeMinScaled == rangeMaxScaled)
return;
while (true)
{
m_tickList.clear();
step = 0;
lastEndPos = -100000000;
done = true;
for (i = 0; true; i++)
{
value = majorTickValue(i);
for (j = 1; j < m_numMinorTicks; j++)
{
value2 = value + minorTickValue(j);
if(value2 < rangeMinScaled)
continue;
if(value2 > rangeMaxScaled)
break;
pos = getPosFromValueTrunc((value + minorTickValue(j)) * m_scale);
if((pos >= 0) && (pos < m_size)) {
tick.pos = pos;
tick.major = false;
tick.textPos = -1;
tick.textSize = -1;
tick.text.clear();
}
m_tickList.append(tick);
}
pos = getPosFromValueTrunc(value * m_scale);
if(pos < 0.0)
continue;
if(pos >= m_size)
break;
tick.pos = pos;
tick.major = true;
tick.textPos = -1;
tick.textSize = -1;
tick.text.clear();
if(step % (skip + 1) != 0) {
m_tickList.append(tick);
step++;
continue;
}
step++;
str = formatTick(value, m_decimalPlaces);
tick.text = str;
tick.textSize = fontMetrics.boundingRect(tick.text).width();
if(m_orientation == Qt::Vertical) {
tick.textPos = pos - fontMetrics.ascent() / 2;
endPos = tick.textPos + fontMetrics.ascent();
} else {
tick.textPos = pos - fontMetrics.boundingRect(tick.text).width() / 2;
endPos = tick.textPos + tick.textSize;
}
if(lastEndPos >= tick.textPos) {
done = false;
break;
} else {
lastEndPos = endPos;
}
m_tickList.append(tick);
}
if(done)
break;
skip++;
}
// make sure we have at least two major ticks with numbers
numMajorTicks = 0;
for(i = 0; i < m_tickList.count(); i++) {
tick = m_tickList.at(i);
if(tick.major)
numMajorTicks++;
}
if(numMajorTicks < 2)
forceTwoTicks();
}
double ScaleEngine::majorTickValue(int tick)
{
return m_firstMajorTickValue + (tick * m_majorTickValueDistance);
}
double ScaleEngine::minorTickValue(int tick)
{
if(m_numMinorTicks < 1)
return 0.0;
return (m_majorTickValueDistance * tick) / m_numMinorTicks;
}
ScaleEngine::ScaleEngine() :
m_orientation(Qt::Horizontal),
m_charSize(8),
m_size(1.0f),
m_physicalUnit(Unit::None),
m_rangeMin(-1.0),
m_rangeMax(1.0),
m_recalc(true),
m_scale(1.0),
m_majorTickValueDistance(1.0),
m_firstMajorTickValue(1.0),
m_numMinorTicks(1),
m_decimalPlaces(1),
m_fixedDecimalPlaces(2),
m_makeOpposite(false),
m_truncateMode(false),
m_truncated(false),
m_truncationValue(0.0)
{
}
void ScaleEngine::setOrientation(Qt::Orientation orientation)
{
m_orientation = orientation;
m_recalc = true;
}
void ScaleEngine::setFont(const QFont& font)
{
m_font = font;
m_recalc = true;
calcCharSize();
}
void ScaleEngine::setSize(float size)
{
if(size > 0.0f) {
m_size = size;
} else {
m_size = 1.0f;
}
m_recalc = true;
}
void ScaleEngine::setRange(Unit::Physical physicalUnit, float rangeMin, float rangeMax)
{
double tmpRangeMin;
double tmpRangeMax;
/*
if(rangeMin < rangeMax) {
tmpRangeMin = rangeMin;
tmpRangeMax = rangeMax;
} else if(rangeMin > rangeMax) {
tmpRangeMin = rangeMax;
tmpRangeMax = rangeMin;
} else {
tmpRangeMin = rangeMin * 0.99;
tmpRangeMax = rangeMin * 1.01 + 0.01;
}
*/
tmpRangeMin = rangeMin;
tmpRangeMax = rangeMax;
if ((tmpRangeMin != m_rangeMin) || (tmpRangeMax != m_rangeMax) || (m_physicalUnit != physicalUnit))
{
m_physicalUnit = physicalUnit;
m_rangeMin = tmpRangeMin;
m_rangeMax = tmpRangeMax;
m_recalc = true;
}
}
float ScaleEngine::getPosFromValue(double value)
{
return ((value - m_rangeMin) / (m_rangeMax - m_rangeMin)) * (m_size - 1.0);
}
float ScaleEngine::getValueFromPos(double pos)
{
return ((pos * (m_rangeMax - m_rangeMin)) / (m_size - 1.0)) + m_rangeMin;
}
float ScaleEngine::getPosFromValueTrunc(double value)
{
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
return ((value - rangeMin) / (rangeMax - rangeMin)) * (m_size - 1.0);
}
float ScaleEngine::getValueFromPosTrunc(double pos)
{
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
return ((pos * (rangeMax - rangeMin)) / (m_size - 1.0)) + rangeMin;
}
const ScaleEngine::TickList& ScaleEngine::getTickList()
{
reCalc();
return m_tickList;
}
QString ScaleEngine::getRangeMinStr()
{
double rangeMin = m_truncated ? m_rangeMin - m_truncationValue : m_rangeMin;
if (m_unitStr.length() > 0) {
return QString("%1 %2").arg(formatTick(rangeMin / m_scale, m_decimalPlaces)).arg(m_unitStr);
} else {
return QString("%1").arg(formatTick(rangeMin / m_scale, m_decimalPlaces));
}
}
QString ScaleEngine::getRangeMaxStr()
{
double rangeMax = m_truncated ? m_rangeMax - m_truncationValue : m_rangeMax;
if (m_unitStr.length() > 0) {
return QString("%1 %2").arg(formatTick(rangeMax / m_scale, m_decimalPlaces)).arg(m_unitStr);
} else {
return QString("%1").arg(formatTick(rangeMax / m_scale, m_decimalPlaces));
}
}
float ScaleEngine::getScaleWidth()
{
float max;
float len;
int i;
reCalc();
max = 0.0f;
for(i = 0; i < m_tickList.count(); i++) {
len = m_tickList[i].textSize;
if(len > max)
max = len;
}
return max;
}
void ScaleEngine::setTruncateMode(bool mode)
{
qDebug("ScaleEngine::setTruncateMode: %s", (mode ? "on" : "off"));
m_truncateMode = mode;
m_recalc = true;
reCalc();
}
void ScaleEngine::updateTruncation()
{
m_truncated = false;
m_truncationValue = 0.0;
if (!m_truncateMode) {
return;
}
if (order(m_rangeMax) != order(m_rangeMin)) {
return;
}
double width = m_rangeMax - m_rangeMin;
int widthOrder = order(width);
int maxOrder = order(m_rangeMax);
if ((widthOrder < 0) || (maxOrder < 0) || (widthOrder == maxOrder)) {
return;
}
for (int i = widthOrder+1; i <= maxOrder; i++)
{
int irangeMin = floor(m_rangeMin / pow(10, i));
int irangeMax = floor(m_rangeMax / pow(10, i));
if (irangeMin == irangeMax)
{
m_truncated = true;
m_truncationValue = irangeMin * pow(10, i);
break;
}
}
qDebug("ScaleEngine::updateTruncation: m_truncationValue: %f", m_truncationValue);
}
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