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#include "horizontalplotscale.h"
#include "ticksets/logarithmictickset.h"
#include "ticksets/numerictickset.h"
#include "ticksets/texttickset.h"
#include "ticksets/timetickset.h"
HorizontalPlotScale::HorizontalPlotScale()
: _widgetWidth(0.0),
_widgetHeight(0.0),
_minFromLeft(0.0),
_fromTop(0.0),
_isSecondAxis(false),
_axisType(AxisType::kNumeric),
_tickRange({0.0, 1.0}),
_tickLabels(),
_isLogarithmic(false),
_isInteger(false),
_rotateUnits(false),
_drawWithDescription(true),
_unitsCaption("x"),
_descriptionFontSize(14),
_tickValuesFontSize(14) {}
HorizontalPlotScale::~HorizontalPlotScale() { Unlink(); }
double HorizontalPlotScale::UnitToAxis(double unitValue) const {
return _tickSet ? _tickSet->UnitToAxis(unitValue) : 0.0;
}
double HorizontalPlotScale::AxisToUnit(double axisValue) const {
return _tickSet ? _tickSet->AxisToUnit(axisValue) : 0.0;
}
void HorizontalPlotScale::Draw(const Cairo::RefPtr<Cairo::Context>& cairo) {
initializeMetrics(cairo);
cairo->set_source_rgb(0.0, 0.0, 0.0);
const Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_tickValuesFontSize * PANGO_SCALE);
layout->set_font_description(fontDescription);
const double tickDisplacement = _isSecondAxis ? -3.0 : 3.0;
const double height = CalculateHeight(cairo);
// Y position of x-axis line
const double yPos =
_isSecondAxis ? _fromTop + height : _widgetHeight - height;
for (unsigned i = 0; i != _tickSet->Size(); ++i) {
const Tick tick = _tickSet->GetTick(i);
const double x = tick.first * Data().plotWidth + Data().fromLeft;
cairo->move_to(x, yPos);
cairo->line_to(x, yPos + tickDisplacement);
layout->set_text(tick.second);
const Pango::Rectangle extents = layout->get_pixel_ink_extents();
if (_rotateUnits) {
const double y = _isSecondAxis ? (yPos + extents.get_lbearing() - 8)
: (yPos + extents.get_width() + 8);
cairo->move_to(x - extents.get_descent() - extents.get_height() / 2, y);
cairo->save();
cairo->rotate(-M_PI * 0.5);
layout->show_in_cairo_context(cairo);
cairo->restore();
} else {
// Room is reserved of size height between the text and the axis
const double y =
_isSecondAxis ? yPos - extents.get_height() : yPos + tickDisplacement;
cairo->move_to(x - extents.get_width() / 2, y);
layout->show_in_cairo_context(cairo);
}
}
cairo->stroke();
if (_drawWithDescription) drawDescription(cairo);
}
void HorizontalPlotScale::drawDescription(
const Cairo::RefPtr<Cairo::Context>& cairo) {
const double yPos = _isSecondAxis ? _fromTop : _widgetHeight;
cairo->save();
const Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_descriptionFontSize * PANGO_SCALE);
layout->set_font_description(fontDescription);
layout->set_text(_unitsCaption);
const Pango::Rectangle extents = layout->get_pixel_logical_extents();
double y = _isSecondAxis ? (yPos - extents.get_descent() + 5)
: (yPos - extents.get_height() - 5);
cairo->move_to(Data().fromLeft + 0.3 * Data().plotWidth, y);
layout->show_in_cairo_context(cairo);
cairo->stroke();
cairo->restore();
// Base of arrow
y = _isSecondAxis ? (yPos + extents.get_height() + 5) : (yPos - 5);
cairo->move_to(Data().fromLeft + 0.1 * Data().plotWidth,
y - 0.5 * extents.get_height());
cairo->line_to(Data().fromLeft + 0.275 * Data().plotWidth,
y - 0.5 * extents.get_height());
cairo->stroke();
// The arrow
cairo->move_to(Data().fromLeft + 0.275 * Data().plotWidth,
y - 0.5 * extents.get_height());
cairo->line_to(Data().fromLeft + 0.25 * Data().plotWidth,
y - 0.2 * extents.get_height());
cairo->line_to(Data().fromLeft + 0.26 * Data().plotWidth,
y - 0.5 * extents.get_height());
cairo->line_to(Data().fromLeft + 0.25 * Data().plotWidth,
y - 0.8 * extents.get_height());
cairo->close_path();
cairo->fill();
}
void HorizontalPlotScale::initializeMetrics(
const Cairo::RefPtr<Cairo::Context>& cairo) {
if (!Data().metricsAreInitialized) {
Data().metricsAreInitialized = true;
double globalPlotWidth = 0.0, globalFromLeft = 0.0, globalRightMargin = 0.0;
for (HorizontalPlotScale* scale : *this) {
double lPlotWidth, lFromLeft, lRightMargin;
scale->initializeLocalMetrics(cairo, lPlotWidth, lFromLeft, lRightMargin);
if (lPlotWidth != 0.0) {
if (globalPlotWidth == 0.0 || globalPlotWidth > lPlotWidth)
globalPlotWidth = lPlotWidth;
}
globalFromLeft = std::max(globalFromLeft, lFromLeft);
globalRightMargin = std::max(globalRightMargin, lRightMargin);
}
if (Data().plotWidth != globalPlotWidth ||
Data().fromLeft != globalFromLeft ||
Data().rightMargin != globalRightMargin) {
Data().plotWidth = globalPlotWidth;
Data().fromLeft = globalFromLeft;
Data().rightMargin = globalRightMargin;
for (HorizontalPlotScale* scale : *this) scale->_signalLinkedRedraw();
}
}
}
double HorizontalPlotScale::CalculateHeight(
const Cairo::RefPtr<Cairo::Context>& cairo) {
const std::unique_ptr<TickSet> lTickSet = _tickSet->Clone();
double height;
if (_drawWithDescription) {
const Glib::RefPtr<Pango::Layout> descTextLayout =
Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_descriptionFontSize * PANGO_SCALE);
descTextLayout->set_text(_unitsCaption);
descTextLayout->set_font_description(fontDescription);
height = descTextLayout->get_pixel_logical_extents().get_height();
} else {
height = 0;
}
int maxTickTextHeight = 0;
const Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_tickValuesFontSize * PANGO_SCALE);
layout->set_font_description(fontDescription);
for (size_t i = 0; i != _tickSet->Size(); ++i) {
const Tick tick = _tickSet->GetTick(i);
layout->set_text(tick.second);
if (_rotateUnits) {
maxTickTextHeight = std::max(
maxTickTextHeight, layout->get_pixel_logical_extents().get_width());
} else {
maxTickTextHeight = std::max(
maxTickTextHeight, layout->get_pixel_logical_extents().get_height());
}
}
if (_rotateUnits)
height += maxTickTextHeight + 15;
else
height += maxTickTextHeight + 10;
return height;
}
void HorizontalPlotScale::initializeLocalMetrics(
const Cairo::RefPtr<Cairo::Context>& cairo, double& plotWidth,
double& fromLeft, double& rightMargin) {
fromLeft = _minFromLeft;
if (_tickSet == nullptr) {
rightMargin = 0.0;
plotWidth = 0.0;
} else {
_tickSet->Reset();
while (!ticksFit(cairo) && _tickSet->Size() > 2) {
_tickSet->DecreaseTicks();
}
if (_tickSet->Size() != 0) {
const Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_tickValuesFontSize * PANGO_SCALE);
layout->set_font_description(fontDescription);
const Tick lastTick = _tickSet->GetTick(_tickSet->Size() - 1);
layout->set_text(lastTick.second);
const int width = layout->get_pixel_logical_extents().get_width();
const double approxOversize =
_widgetWidth * lastTick.first + width / 2 - _widgetWidth;
rightMargin = std::max(10.0, approxOversize + 5.0);
} else {
rightMargin = 0.0;
}
plotWidth = _widgetWidth - _minFromLeft - rightMargin;
}
}
void HorizontalPlotScale::InitializeTicks() {
if (_isLogarithmic) {
_tickSet =
std::make_unique<LogarithmicTickSet>(_tickRange[0], _tickRange[1], 25);
} else {
switch (_axisType) {
case AxisType::kNumeric:
_tickSet = std::make_unique<NumericTickSet>(
_tickRange[0], _tickRange[1], 25, _isInteger);
break;
case AxisType::kText:
_tickSet = std::make_unique<TextTickSet>(_tickLabels, 100);
break;
case AxisType::kTime:
_tickSet =
std::make_unique<TimeTickSet>(_tickRange[0], _tickRange[1], 25);
break;
}
}
Data().metricsAreInitialized = false;
}
bool HorizontalPlotScale::ticksFit(const Cairo::RefPtr<Cairo::Context>& cairo) {
cairo->set_font_size(16.0);
double prevEndX = 0.0;
const Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(cairo);
Pango::FontDescription fontDescription;
fontDescription.set_size(_tickValuesFontSize * PANGO_SCALE);
layout->set_font_description(fontDescription);
for (unsigned i = 0; i != _tickSet->Size(); ++i) {
const Tick tick = _tickSet->GetTick(i);
// Use "M" to get at least an "M" of distance between axis
layout->set_text(tick.second + "M");
const Pango::Rectangle extents = layout->get_pixel_logical_extents();
const double midX =
tick.first * (Data().plotWidth - Data().fromLeft) + Data().fromLeft;
double startX, endX;
if (_rotateUnits) {
startX = midX - extents.get_height() / 2;
endX = startX + extents.get_height();
} else {
startX = midX - extents.get_width() / 2;
endX = startX + extents.get_width();
}
if (startX < prevEndX && i != 0) return false;
prevEndX = endX;
}
return true;
}
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