initial commit

18 files changed, 1614 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..56838cf
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,15 @@
+AccessModifierOffset: -4
+AlignAfterOpenBracket: BlockIndent
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+BasedOnStyle: Microsoft
+BinPackParameters: false
+BinPackArguments: false
+BreakConstructorInitializers: BeforeComma
+ColumnLimit: 80
+InsertNewlineAtEOF: true
+IndentWidth: 4
+SpacesBeforeTrailingComments: 2
+UseTab: Never
+LineEnding: LF
+PointerAlignment: Left
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aa3808c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,82 @@
+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+*.qbs.user*
+CMakeLists.txt.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+
+# Directories with generated files
+.moc/
+.obj/
+.pch/
+.rcc/
+.uic/
+/build*/
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..23bc04c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "third_party/goodies"]
+	path = third_party/goodies
+	url = kostovsky.me:/srv/git/goodies
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..2a39f3c
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 4.1)
+
+project(OpticalDesign VERSION 0.1 LANGUAGES CXX)
+
+add_subdirectory(src)
+add_subdirectory(third_party)
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 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 for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..738c5ac
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# Calculate optical design for laser triangulation scanner
+
+This app allows to enter parameters of your lense, image sensor and scanner body and visualize resulting optical schema
+
+# Build and run
+
+```sh
+git clone https://git.kostovsky.me/optical_design/
+cd optical_design/
+git submodule update --init
+mkdir build
+cd build/
+cmake ..
+make -j${nproc}
+./src/optical_design
+```
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..9ef55bb
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,45 @@
+cmake_minimum_required(VERSION 4.1)
+
+project(optical_design LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 6.5 REQUIRED COMPONENTS Core Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(${PROJECT_NAME}
+    WIN32 MACOSX_BUNDLE
+    main.cpp
+    mainwindow.cpp
+    mainwindow.h
+    opticaldesign.h
+    opticaldesign.cpp
+    graphicsscene.h
+    graphicsscene.cpp
+    graphicsview.h
+    graphicsview.cpp
+)
+
+target_link_libraries(${PROJECT_NAME}
+    PRIVATE
+        Qt::Core
+        Qt::Widgets
+        goodies
+)
+
+include(GNUInstallDirs)
+
+install(TARGETS ${PROJECT_NAME}
+    BUNDLE  DESTINATION .
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+qt_generate_deploy_app_script(
+    TARGET ${PROJECT_NAME}
+    OUTPUT_SCRIPT deploy_script
+    NO_UNSUPPORTED_PLATFORM_ERROR
+)
+install(SCRIPT ${deploy_script})
diff --git a/src/graphicsscene.cpp b/src/graphicsscene.cpp
new file mode 100644
index 0000000..52416d5
--- /dev/null
+++ b/src/graphicsscene.cpp
@@ -0,0 +1,232 @@
+#include "graphicsscene.h"
+
+// qt
+#include <QGraphicsEllipseItem>
+#include <QGraphicsLineItem>
+#include <QGraphicsPolygonItem>
+
+namespace orphex
+{
+namespace constants
+{
+const QLineF laserPlane{QPointF{-1000, 0}, QPointF{1000, 0}};
+}
+}  // namespace orphex
+
+GraphicsScene::GraphicsScene(QObject* parent)
+    : QGraphicsScene{parent}
+{
+    setSceneRect(QRectF{QPointF{-1000, -1000}, QPointF{1000, 1000}});
+
+    m_lenseItem = addEllipse(
+        QRectF{QPointF{-1, -15}, QPointF{1, 15}},
+        QPen{Qt::yellow, 0}
+    );
+    m_lenseItem->setTransformOriginPoint(m_lenseItem->boundingRect().center());
+
+    m_sensorItem = new QGraphicsLineItem(QLineF{}, m_lenseItem);
+    m_sensorItem->setPen(QPen{Qt::red, 0});
+
+    m_lineOfActionItem = new QGraphicsLineItem{
+        QLineF{QPointF{0, -50}, QPointF{0, 50}},
+        m_lenseItem
+    };
+    m_lineOfActionItem->setPen(QPen{Qt::gray, 0});
+
+    m_opticalAxisItem = new QGraphicsLineItem{
+        QLineF{QPointF{-1000, 0}, QPointF{1000, 0}},
+        m_lenseItem
+    };
+    m_opticalAxisItem->setPen(QPen{Qt::gray, 0});
+
+    using namespace orphex::constants;
+    m_laserPlaneItem = addLine(laserPlane, QPen{Qt::black, 0});
+    m_laserPlaneItem->stackBefore(m_lenseItem);
+
+    m_reverseLaserPlaneItem = new QGraphicsLineItem(QLineF{}, m_lenseItem);
+    m_reverseLaserPlaneItem->setPen(QPen{Qt::magenta, 2});
+    m_reverseLaserPlaneItem->setVisible(false);
+
+    m_desiredLaserPlaneItem = new QGraphicsLineItem(QLineF{}, m_lenseItem);
+    m_desiredLaserPlaneItem->setPen(QPen{Qt::yellow, 0.1});
+    m_desiredLaserPlaneItem->setOpacity(0.5);
+
+    m_desiredImagePlaneItem = new QGraphicsLineItem(QLineF{}, m_lenseItem);
+    m_desiredImagePlaneItem->setPen(QPen{Qt::yellow, 0.15});
+    m_desiredImagePlaneItem->stackBefore(m_sensorItem);
+
+    m_desiredRangeAreaItem = new QGraphicsPolygonItem{m_lenseItem};
+    m_desiredRangeAreaItem->setPen(
+        QPen{m_desiredLaserPlaneItem->pen().color(), 0}
+    );
+    m_desiredRangeAreaItem->setBrush(
+        QBrush{m_desiredLaserPlaneItem->pen().color()}
+    );
+    m_desiredRangeAreaItem->setOpacity(0.1);
+
+    m_actualRangeItem = new QGraphicsLineItem(QLineF{}, m_lenseItem);
+    m_actualRangeItem->setPen(QPen{Qt::red, 0.1});
+    m_actualRangeItem->setOpacity(0.5);
+
+    m_actualRangeAreaItem = new QGraphicsPolygonItem{m_lenseItem};
+    m_actualRangeAreaItem->setPen(QPen{m_sensorItem->pen().color(), 0});
+    m_actualRangeAreaItem->setBrush(QBrush{m_sensorItem->pen().color()});
+    m_actualRangeAreaItem->setOpacity(0.1);
+}
+
+void GraphicsScene::update(OpticalDesign* design)
+{
+    if (!design)
+    {
+        qCritical() << Q_FUNC_INFO << "design is nullptr";
+        return;
+    }
+
+    using namespace orphex::constants;
+
+    const auto F = design->get_focalDistanceMm();
+    const auto H = design->get_lenseYPosMm();
+    const auto w = design->get_sensorPixelsWidth();
+    const auto h = design->get_sensorPixelsHeight();
+    const auto wMm = design->get_sensorWidthMm();
+    const auto hMm = design->get_sensorHeightMm();
+    const auto oAngle = design->get_opticalAxisAngleDegrees();
+
+    m_lenseItem->setRotation(m_lenseItem->rotation());
+    m_lenseItem->setRotation(-oAngle);
+    m_lenseItem->setPos(QPointF{0, -H});
+
+    const auto objectToImage = [F](const QPointF& objectPoint) -> QPointF {
+        // please note that object X is negative
+        const auto imagePointX = 1. / (1. / F - 1. / -objectPoint.x());
+        const auto magnification = imagePointX / objectPoint.x();
+        const auto imagePointY = magnification * objectPoint.y();
+
+        return QPointF{imagePointX, imagePointY};
+    };
+
+    const auto imageToObject = [F](const QPointF& imagePoint) -> QPointF {
+        const auto objectPointX = 1. / (1. / imagePoint.x() - 1. / F);
+        const auto magnification = imagePoint.x() / objectPointX;
+        const auto objectPointY = imagePoint.y() / magnification;
+
+        return QPointF{objectPointX, objectPointY};
+    };
+
+    // calculate sensor plane
+    const auto& oai = m_opticalAxisItem;
+    const auto& oail = m_opticalAxisItem->line();
+    const QLineF opticalAxisScene{
+        oai->mapToScene(oail.p1()),
+        oai->mapToScene(oail.p2())
+    };
+
+    QPointF intersection{};
+    const auto type =
+        m_laserPlaneItem->line().intersects(opticalAxisScene, &intersection);
+
+    if (type == QLineF::NoIntersection)
+    {
+        qCritical() << "no intersection between laser plane and optical axis";
+        return;
+    }
+
+    if (!qFuzzyCompare(intersection.y(), 0.))
+    {
+        qCritical() << "laser plane/optical axis intersection point y != 0";
+        return;
+    }
+
+    // take 2 points - to the left and to the right from intersection point;
+    const auto leftP = intersection / 4;
+    // const auto rightP = intersection + leftP;
+    const auto rightP = intersection * 1.5;
+
+    // create desired line on laser plane
+    m_desiredLaserPlaneItem->setLine(
+        {m_lenseItem->mapFromScene(QPointF{-design->get_zBaseMm(), 0}),
+         m_lenseItem->mapFromScene(
+             QPointF{-(design->get_zBaseMm() + design->get_zRangeMm()), 0}
+         )}
+    );
+
+    // calculate image plane
+    const auto debugL = m_desiredLaserPlaneItem->line();
+    const QLineF debugImageL{
+        objectToImage(debugL.p1()),
+        objectToImage(debugL.p2())
+    };
+
+    m_desiredImagePlaneItem->setLine(debugImageL);
+
+    // create sensor line on image plane
+    QPointF sensorCenterPos{};
+
+    if (m_opticalAxisItem->line().intersects(
+            m_desiredImagePlaneItem->line(),
+            &sensorCenterPos
+        ) == QLineF::NoIntersection)
+    {
+        qCritical() << "no intersection between sensor plane and optical axis";
+        return;
+    }
+
+    const auto sensorHalfHeight = design->get_sensorHeightMm() / 2.;
+    QLineF sensorLine{QPointF{0, 0}, QPointF{0, sensorHalfHeight}};
+    sensorLine.translate(sensorCenterPos);
+    sensorLine.setAngle(m_desiredImagePlaneItem->line().angle());
+    sensorLine.setP1(sensorCenterPos + (sensorCenterPos - sensorLine.p2()));
+    // at this momet sensor is centered and rotated. apply vertical offset
+    const auto offsetRatio =
+        design->get_sensorVerticalOffsetMm() / sensorLine.length();
+    const auto offset = sensorLine.pointAt(1 + offsetRatio) - sensorLine.p2();
+    sensorLine.setPoints(sensorLine.p1() + offset, sensorLine.p2() + offset);
+
+    m_sensorItem->setLine(sensorLine);
+
+    // find laser plane range which corresponds to sensor position
+    m_actualRangeItem->setLine({
+        imageToObject(m_sensorItem->line().p1()),
+        imageToObject(m_sensorItem->line().p2()),
+    });
+
+    // not that object area has negative coords
+    design->set_actualZBaseMm(
+        -m_actualRangeItem->mapToScene(m_actualRangeItem->line().p1()).x()
+    );
+    design->set_actualZRangeMm(m_actualRangeItem->line().length());
+
+    // convert debug image plane to laser plane just to verify they are the same
+    // TODO: check with code and log errors?
+    const QLineF reverseLaserPlaneLine{
+        imageToObject(m_desiredImagePlaneItem->line().p1()),
+        imageToObject(m_desiredImagePlaneItem->line().p2())
+    };
+    m_reverseLaserPlaneItem->setLine(reverseLaserPlaneLine);
+
+    // fill desired range area
+    m_desiredRangeAreaItem->setPolygon(
+        QPolygonF{
+            {m_desiredImagePlaneItem->line().p1(),
+             m_desiredImagePlaneItem->line().p2(),
+             m_desiredLaserPlaneItem->line().p2(),
+             m_desiredLaserPlaneItem->line().p1()}
+        }
+    );
+
+    // fill actual range area
+    m_actualRangeAreaItem->setPolygon(
+        QPolygonF{
+            {m_sensorItem->line().p1(),
+             m_sensorItem->line().p2(),
+             m_actualRangeItem->line().p2(),
+             m_actualRangeItem->line().p1()}
+        }
+    );
+
+    design->set_sensorLenseAngleDegrees(
+        m_desiredImagePlaneItem->line().angleTo(m_lineOfActionItem->line())
+    );
+
+    // TODO: take back focal length into account
+}
diff --git a/src/graphicsscene.h b/src/graphicsscene.h
new file mode 100644
index 0000000..289deba
--- /dev/null
+++ b/src/graphicsscene.h
@@ -0,0 +1,33 @@
+#pragma once
+
+// qt
+#include <QGraphicsScene>
+
+// optical design
+#include "opticaldesign.h"
+
+class GraphicsScene : public QGraphicsScene
+{
+    Q_OBJECT
+
+public:
+    explicit GraphicsScene(QObject* parent = nullptr);
+    ~GraphicsScene() override = default;
+
+public slots:
+    // TODO: store design in scene?
+    void update(OpticalDesign* design);
+
+private:
+    QGraphicsLineItem* m_lineOfActionItem{nullptr};
+    QGraphicsEllipseItem* m_lenseItem{nullptr};
+    QGraphicsLineItem* m_opticalAxisItem{nullptr};
+    QGraphicsLineItem* m_laserPlaneItem{nullptr};
+    QGraphicsLineItem* m_desiredLaserPlaneItem{nullptr};
+    QGraphicsLineItem* m_reverseLaserPlaneItem{nullptr};
+    QGraphicsLineItem* m_desiredImagePlaneItem{nullptr};
+    QGraphicsLineItem* m_sensorItem{nullptr};
+    QGraphicsLineItem* m_actualRangeItem{nullptr};
+    QGraphicsPolygonItem* m_desiredRangeAreaItem{nullptr};
+    QGraphicsPolygonItem* m_actualRangeAreaItem{nullptr};
+};
diff --git a/src/graphicsview.cpp b/src/graphicsview.cpp
new file mode 100644
index 0000000..b81cff4
--- /dev/null
+++ b/src/graphicsview.cpp
@@ -0,0 +1,47 @@
+#include "graphicsview.h"
+
+// qt
+#include <QWheelEvent>
+
+GraphicsView::GraphicsView(QWidget* parent)
+    : QGraphicsView{parent}
+{
+    init();
+}
+
+GraphicsView::GraphicsView(QGraphicsScene* scene, QWidget* parent)
+    : QGraphicsView{scene, parent}
+{
+    init();
+}
+
+void GraphicsView::wheelEvent(QWheelEvent* event)
+{
+    setTransformationAnchor(GraphicsView::AnchorUnderMouse);
+
+    QPoint pixels = event->pixelDelta();
+    QPoint degrees = event->angleDelta();
+    const auto oldScenePos = event->scenePosition();
+    const auto oldMapped = mapToScene(event->position().toPoint());
+
+    if (pixels.isNull() && degrees.isNull())
+        return;
+
+    const double scaleMultiplier{1.1};
+    const auto steps = double(pixels.isNull() ? degrees.y() : pixels.y());
+    auto actualScale = std::abs(steps) * scaleMultiplier /
+                       double(QWheelEvent::DefaultDeltasPerStep);
+
+    if (steps < 0)
+        actualScale = 1 / actualScale;
+
+    scale(actualScale, actualScale);
+
+    event->accept();
+}
+
+void GraphicsView::init()
+{
+    setDragMode(QGraphicsView::ScrollHandDrag);
+    setRenderHint(QPainter::Antialiasing, true);
+}
diff --git a/src/graphicsview.h b/src/graphicsview.h
new file mode 100644
index 0000000..b7672ee
--- /dev/null
+++ b/src/graphicsview.h
@@ -0,0 +1,21 @@
+#pragma once
+
+// qt
+#include <QGraphicsView>
+
+class GraphicsView : public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    explicit GraphicsView(QWidget* parent = nullptr);
+    explicit GraphicsView(QGraphicsScene* scene, QWidget* parent = nullptr);
+    ~GraphicsView() override = default;
+
+    // QGraphicsView
+public:
+    void wheelEvent(QWheelEvent* event) override;
+
+private:
+    void init();
+};
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..96ec1e3
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,19 @@
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    a.setApplicationName("OpticalDesign");
+    a.setApplicationDisplayName("Optical Design");
+    // TODO: move to cmake
+    a.setApplicationVersion(QStringLiteral("0.1"));
+    a.setOrganizationName("Orphex");
+    a.setOrganizationDomain("kostovsky.me");
+
+    MainWindow w;
+    w.showMaximized();
+    return a.exec();
+}
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
new file mode 100644
index 0000000..66274c1
--- /dev/null
+++ b/src/mainwindow.cpp
@@ -0,0 +1,303 @@
+#include "mainwindow.h"
+
+// qt
+#include <QComboBox>
+#include <QDoubleSpinBox>
+#include <QFormLayout>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QOpenGLWidget>
+#include <QShortcut>
+#include <QStyle>
+
+// optical design
+#include "graphicsscene.h"
+#include "graphicsview.h"
+#include "opticaldesign.h"
+
+MainWindow::MainWindow(QWidget* parent)
+    : QMainWindow{parent}
+    , m_scene{new GraphicsScene{this}}
+    , m_view{new GraphicsView{m_scene, this}}
+    , m_design{new OpticalDesign{this}}
+{
+    initUi();
+    initShortcuts();
+}
+
+MainWindow::~MainWindow() {}
+
+void MainWindow::initUi()
+{
+    setMinimumSize({640, 480});
+
+    qDebug() << "global settings path:"
+             << GlobalSettings::instance()->fileName();
+
+    const auto mainWidget = new QWidget{this};
+
+    const auto mainLayout = new QHBoxLayout{mainWidget};
+    mainWidget->setLayout(mainLayout);
+    // addLayout sets parent below
+    const auto leftLayout = new QFormLayout{};
+    leftLayout->setLabelAlignment(Qt::AlignVCenter | Qt::AlignRight);
+    mainLayout->addLayout(leftLayout);
+
+    // left panel
+    const auto connectWidgetToProperty = [this](
+                                             const auto widget,
+                                             const auto widgetSignal,
+                                             const auto widgetSetter,
+                                             const auto propertyObject,
+                                             const auto propertySignal,
+                                             const auto propertySetter
+                                         ) {
+        connect(widget, widgetSignal, propertyObject, propertySetter);
+        connect(propertyObject, propertySignal, widget, widgetSetter);
+    };
+
+    using MinValue = double;
+    using MaxValue = double;
+    using SingleStep = double;
+    auto addFormPair = [this, leftLayout, connectWidgetToProperty](
+                           const QString text,
+                           const auto propertySignal,
+                           const auto propertyGetter,
+                           const auto propertySetter,
+                           const MinValue minValue,
+                           const MaxValue maxValue,
+                           const SingleStep singleStep = 0.1
+                       ) {
+        const auto spinBox = new QDoubleSpinBox{centralWidget()};
+        spinBox->setRange(minValue, maxValue);
+        spinBox->setSingleStep(singleStep);
+        spinBox->setValue(std::bind(propertyGetter, m_design)());
+
+        connect(
+            spinBox,
+            &QDoubleSpinBox::valueChanged,
+            m_design,
+            propertySetter
+        );
+        connect(m_design, propertySignal, spinBox, &QDoubleSpinBox::setValue);
+        connect(
+            m_design,
+            propertySignal,
+            m_scene,
+            std::bind(&GraphicsScene::update, m_scene, m_design)
+        );
+
+        leftLayout->addRow(text, spinBox);
+    };
+
+    using Decimals = int;
+    auto addFormLabel = [this, leftLayout](
+                            const QString text,
+                            const auto propertySignal,
+                            const Decimals decimals = 2
+                        ) {
+        const auto label = new QLabel{centralWidget()};
+
+        connect(
+            m_design,
+            propertySignal,
+            label,
+            [label, decimals](const auto value) {
+                label->setText(QString::number(value, 'F', decimals));
+            }
+        );
+
+        leftLayout->addRow(text, label);
+    };
+
+    const auto createLenseApertureComboBox = [this, leftLayout]() {
+        const auto comboBox = new QComboBox{centralWidget()};
+
+        using namespace orphex;
+        const auto metaEnum = QMetaEnum::fromType<LenseAperture>();
+
+        for (int i{0}; i < metaEnum.keyCount(); ++i)
+        {
+            const auto key = metaEnum.key(i);
+            const auto value = metaEnum.value(i);
+            const auto text =
+                QString{key}
+                    .replace(QStringLiteral("F"), QStringLiteral("1/"))
+                    .replace(QChar{'_'}, QChar{'.'});
+
+            comboBox->addItem(text, value);
+        }
+
+        // update property on combobox change
+        connect(
+            comboBox,
+            &QComboBox::currentIndexChanged,
+            m_design,
+            [this, metaEnum, comboBox](const auto index) {
+                m_design->set_lenseAperture(
+                    comboBox->currentData().value<LenseAperture>()
+                );
+
+                qDebug() << m_design->get_lenseAperture();
+            }
+        );
+
+        // update combobox on property change
+        connect(
+            m_design,
+            qOverload<LenseAperture>(&OpticalDesign::lenseApertureChanged),
+            comboBox,
+            [comboBox](const auto value) {
+                comboBox->setCurrentIndex(
+                    comboBox->findData(QVariant::fromValue(value))
+                );
+            }
+        );
+
+        leftLayout->addRow(tr("Lense A&perture:"), comboBox);
+    };
+
+    addFormPair(
+        tr("&Axis Angle (°):"),
+        qOverload<double>(&OpticalDesign::opticalAxisAngleDegreesChanged),
+        &OpticalDesign::get_opticalAxisAngleDegrees,
+        &OpticalDesign::set_opticalAxisAngleDegrees,
+        MinValue{10.},
+        MaxValue{85.}
+    );
+
+    addFormPair(
+        tr("Lense &Y pos (mm):"),
+        qOverload<double>(&OpticalDesign::lenseYPosMmChanged),
+        &OpticalDesign::get_lenseYPosMm,
+        &OpticalDesign::set_lenseYPosMm,
+        MinValue{10.},
+        MaxValue{500.},
+        SingleStep{1.}
+    );
+
+    addFormPair(
+        tr("&Focal Distance (mm):"),
+        qOverload<double>(&OpticalDesign::focalDistanceMmChanged),
+        &OpticalDesign::get_focalDistanceMm,
+        &OpticalDesign::set_focalDistanceMm,
+        MinValue{1.},
+        MaxValue{45.}
+    );
+
+    createLenseApertureComboBox();
+
+    addFormPair(
+        tr("Sensor &Width (mm):"),
+        qOverload<double>(&OpticalDesign::sensorWidthMmChanged),
+        &OpticalDesign::get_sensorWidthMm,
+        &OpticalDesign::set_sensorWidthMm,
+        MinValue{1.},
+        MaxValue{30.}
+    );
+
+    addFormPair(
+        tr("Sensor &Height (mm):"),
+        qOverload<double>(&OpticalDesign::sensorHeightMmChanged),
+        &OpticalDesign::get_sensorHeightMm,
+        &OpticalDesign::set_sensorHeightMm,
+        MinValue{1.},
+        MaxValue{30.}
+    );
+
+    addFormPair(
+        tr("Sensor Cell W&idth (mm):"),
+        qOverload<double>(&OpticalDesign::sensorCellWidthUmChanged),
+        &OpticalDesign::get_sensorCellWidthUm,
+        &OpticalDesign::set_sensorCellWidthUm,
+        MinValue{1.},
+        MaxValue{30.}
+    );
+
+    addFormPair(
+        tr("Sensor Cell H&eight (mm):"),
+        qOverload<double>(&OpticalDesign::sensorCellHeightUmChanged),
+        &OpticalDesign::get_sensorCellHeightUm,
+        &OpticalDesign::set_sensorCellHeightUm,
+        MinValue{1.},
+        MaxValue{30.}
+    );
+
+    addFormPair(
+        tr("Sensor Vertical &Offset (mm):"),
+        qOverload<double>(&OpticalDesign::sensorVerticalOffsetMmChanged),
+        &OpticalDesign::get_sensorVerticalOffsetMm,
+        &OpticalDesign::set_sensorVerticalOffsetMm,
+        MinValue{-50.},
+        MaxValue{50.},
+        SingleStep{0.1}
+    );
+
+    addFormPair(
+        tr("Z &Base (mm):"),
+        qOverload<double>(&OpticalDesign::zBaseMmChanged),
+        &OpticalDesign::get_zBaseMm,
+        &OpticalDesign::set_zBaseMm,
+        MinValue{1.},
+        MaxValue{10000.},
+        SingleStep{1.}
+    );
+
+    addFormPair(
+        tr("Z &Range (mm):"),
+        qOverload<double>(&OpticalDesign::zRangeMmChanged),
+        &OpticalDesign::get_zRangeMm,
+        &OpticalDesign::set_zRangeMm,
+        MinValue{1.},
+        MaxValue{10000.},
+        SingleStep{1.}
+    );
+
+    addFormLabel(
+        tr("Sensor/Lense Angle (°):"),
+        qOverload<double>(&OpticalDesign::sensorLenseAngleDegreesChanged),
+        Decimals{3}
+    );
+
+    addFormLabel(
+        tr("Actual Z Base (mm):"),
+        qOverload<double>(&OpticalDesign::actualZBaseMmChanged),
+        Decimals{2}
+    );
+
+    addFormLabel(
+        tr("Actual Z Range (mm):"),
+        qOverload<double>(&OpticalDesign::actualZRangeMmChanged),
+        Decimals{2}
+    );
+
+    // graphics view
+    const auto openGlWidget = new QOpenGLWidget{centralWidget()};
+    QSurfaceFormat surfaceFormat{};
+    surfaceFormat.setSamples(4);
+    openGlWidget->setFormat(surfaceFormat);
+    m_view->setViewport(openGlWidget);
+    // m_view->centerOn({0, 0});
+    // m_view->ensureVisible(QRectF{m_scene->sceneRect()});
+
+    mainLayout->addWidget(m_view);
+    setCentralWidget(mainWidget);
+
+    connect(
+        m_design,
+        qOverload<double>(&OpticalDesign::opticalAxisAngleDegreesChanged),
+        this,
+        [](const auto value) { qDebug() << "angle changed:" << value; }
+    );
+
+    m_view->setTransformationAnchor(GraphicsView::AnchorViewCenter);
+    m_view->scale(15, 15);
+    m_view->centerOn({0, -m_design->get_lenseYPosMm()});
+
+    m_scene->update(m_design);
+}
+
+void MainWindow::initShortcuts()
+{
+    new QShortcut{Qt::CTRL | Qt::Key_Q, this, this, &MainWindow::close};
+}
diff --git a/src/mainwindow.h b/src/mainwindow.h
new file mode 100644
index 0000000..3b4922a
--- /dev/null
+++ b/src/mainwindow.h
@@ -0,0 +1,27 @@
+#pragma once
+
+// qt
+#include <QMainWindow>
+
+// optical design
+class GraphicsScene;
+class GraphicsView;
+class OpticalDesign;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    void initUi();
+    void initShortcuts();
+
+private:
+    GraphicsScene* m_scene{nullptr};
+    GraphicsView* m_view{nullptr};
+    OpticalDesign* m_design{nullptr};
+};
diff --git a/src/opticaldesign.cpp b/src/opticaldesign.cpp
new file mode 100644
index 0000000..01f6050
--- /dev/null
+++ b/src/opticaldesign.cpp
@@ -0,0 +1,14 @@
+#include "opticaldesign.h"
+
+// qt
+#include <QSize>
+
+void OpticalDesign::calculate() const
+{
+    const auto F = get_focalDistanceMm();
+    const auto w = get_sensorPixelsWidth();
+    const auto h = get_sensorPixelsHeight();
+    const auto wMm = get_sensorWidthMm();
+    const auto hMm = get_sensorHeightMm();
+    const auto oAngle = get_opticalAxisAngleDegrees();
+}
diff --git a/src/opticaldesign.h b/src/opticaldesign.h
new file mode 100644
index 0000000..e6fb2c6
--- /dev/null
+++ b/src/opticaldesign.h
@@ -0,0 +1,74 @@
+#pragma once
+
+// goodies
+#include <g_object.h>
+#include <g_property.h>
+
+namespace orphex
+{
+Q_NAMESPACE
+// multiplied by 10
+enum class LenseAperture
+{
+    F0_5 = 05,
+    F0_7 = 07,
+    F1_0 = 10,
+    F1_2 = 12,
+    F1_4 = 14,
+    F2_0 = 20,
+    F2_8 = 28,
+    F4_0 = 40,
+    F5_6 = 56,
+    F8_0 = 80,
+    F11_0 = 110,
+    F16_0 = 160,
+    F22_0 = 220,
+    F32_0 = 320,
+    F45_0 = 450,
+    F64_0 = 640,
+    F90_0 = 900,
+    F128_0 = 1280,
+    F180_0 = 1800,
+    F256_0 = 2560
+};
+Q_ENUM_NS(LenseAperture)
+}  // namespace orphex
+
+// Q_DECLARE_METATYPE(orphex::LenseAperture)
+
+class OpticalDesign : public G_Object
+{
+    Q_OBJECT
+
+    DEFAULT_CONSTRUCTOR(G_Object, OpticalDesign)
+    DEFAULT_DESTRUCTOR(OpticalDesign);
+    G_OBJECT(G_Object, OpticalDesign)
+
+public:
+    void calculate() const;
+
+protected:
+    INI_PROPERTY(double, opticalAxisAngleDegrees, 45.);
+    // the Y axis is directed from the laser to the lens
+    INI_PROPERTY(double, lenseYPosMm, 50.);
+    INI_PROPERTY(double, focalDistanceMm, 6.);
+    INI_PROPERTY_VAR(
+        orphex::LenseAperture,
+        lenseAperture,
+        orphex::LenseAperture::F1_2
+    );
+    INI_PROPERTY(double, sensorWidthMm, 4.98);
+    INI_PROPERTY(double, sensorHeightMm, 3.74);
+    INI_PROPERTY(double, sensorCellWidthUm, 6.9);
+    INI_PROPERTY(double, sensorCellHeightUm, 6.9);
+    // sensor vertical offset along the image plane
+    INI_PROPERTY(double, sensorVerticalOffsetMm, 0.);
+    INI_PROPERTY(uint16_t, sensorPixelsHeight, 720);
+    INI_PROPERTY(uint16_t, sensorPixelsWidth, 544);
+    INI_PROPERTY(double, zBaseMm, 90);
+    INI_PROPERTY(double, zRangeMm, 250);
+
+    G_PROPERTY_DEFAULT(double, sensorLenseAngleDegrees, 0.);
+    G_PROPERTY_DEFAULT(double, actualZBaseMm, 0.);
+    G_PROPERTY_DEFAULT(double, actualZRangeMm, 0.);
+};
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
new file mode 100644
index 0000000..32d7908
--- /dev/null
+++ b/third_party/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 4.1)
+
+add_subdirectory(goodies)
diff --git a/third_party/goodies b/third_party/goodies
new file mode 160000
+Subproject e7019763076cbbe3d52c2a03133c3ded5558f01