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Export images with transparent background #2442

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Export images with transparent background #2442

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20 changes: 18 additions & 2 deletions src/gui/print_widget.cpp
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*
* Copyright 2012, 2013 Thomas Schöps
* Copyright 2012-2021 Kai Pastor
* Copyright 2012-2021, 2025 Kai Pastor
*
* This file is part of OpenOrienteering.
*
Expand Down Expand Up @@ -301,6 +301,10 @@ PrintWidget::PrintWidget(Map* map, MainWindow* main_window, MapView* main_view,
layout->addRow(world_file_check);
world_file_check->hide();

transparent_background_check = new QCheckBox(tr("Transparent background"));
layout->addRow(transparent_background_check);
transparent_background_check->hide();

scrolling_content = new QWidget();
scrolling_content->setLayout(layout);

Expand Down Expand Up @@ -670,6 +674,8 @@ void PrintWidget::setTarget(const QPrinterInfo* target)
// no point in writing a world file.
world_file_check->setChecked(!map->getGeoreferencing().toProjectedCoords(MapCoordF{}).isNull());

transparent_background_check->setVisible(is_image_target);

updateColorMode();
}

Expand Down Expand Up @@ -1154,6 +1160,7 @@ void PrintWidget::overprintingClicked(bool checked)
map_printer->setSimulateOverprinting(checked);
}


void PrintWidget::colorModeChanged()
{
if (color_mode_combo->currentData().toBool())
Expand Down Expand Up @@ -1299,11 +1306,20 @@ void PrintWidget::exportToImage()
return;
}

bool transparent_background = transparent_background_check->isChecked();
if (transparent_background
&& !path.endsWith(QLatin1String(".png"), Qt::CaseInsensitive)
&& !path.endsWith(QLatin1String(".tif"), Qt::CaseInsensitive) && !path.endsWith(QLatin1String(".tiff"), Qt::CaseInsensitive) )
{
transparent_background = false;
QMessageBox::information(this, tr("Information"), tr("Transparent background is not supported for this file format.\nUsing a white background instead."));
}

int dots_per_meter = qRound(pixel_per_mm * 1000);
image.setDotsPerMeterX(dots_per_meter);
image.setDotsPerMeterY(dots_per_meter);

image.fill(QColor(Qt::white));
image.fill(QColor(transparent_background ? Qt::transparent : Qt::white));

#if 0 // Pointless unless drawPage drives the event loop and sends progress
PrintProgressDialog progress(map_printer, main_window);
Expand Down
10 changes: 5 additions & 5 deletions src/gui/print_widget.h
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*
* Copyright 2012, 2013 Thomas Schöps
* Copyright 2012-2021 Kai Pastor
* Copyright 2012-2021, 2025 Kai Pastor
*
* This file is part of OpenOrienteering.
*
Expand Down Expand Up @@ -209,7 +209,7 @@ protected slots:

/** This slot reacts to changes of the "Simulate overprinting" option. */
void overprintingClicked(bool checked);

/** This slot reacts to changes of the "Color mode" option. */
void colorModeChanged();

Expand Down Expand Up @@ -303,6 +303,7 @@ protected slots:
QCheckBox* show_grid_check;
QCheckBox* overprinting_check;
QCheckBox* world_file_check;
QCheckBox* transparent_background_check;
QCheckBox* different_scale_check;
QSpinBox* different_scale_edit;
QComboBox* color_mode_combo;
Expand Down Expand Up @@ -344,7 +345,6 @@ protected slots:
Q_DECLARE_OPERATORS_FOR_FLAGS(OpenOrienteering::PrintWidget::TaskFlags)


#endif

#endif // OPENORIENTEERING_PRINT_WIDGET_H

#endif
#endif // QT_PRINTSUPPORT_LIB