2 files changed, 166 insertions, 0 deletions
diff --git a/demos/graphics_experiments/4.cpp b/demos/graphics_experiments/4.cpp
new file mode 100644
index 00000000..04f7edb7
--- /dev/null
+++ b/demos/graphics_experiments/4.cpp
@@ -0,0 +1,161 @@
+#include "cru/platform/GraphicsBase.hpp"
+#include "cru/platform/bootstrap/Bootstrap.hpp"
+#include "cru/platform/graphics/Factory.hpp"
+#include "cru/platform/graphics/Painter.hpp"
+#include "cru/platform/gui/UiApplication.hpp"
+#include "cru/platform/gui/Window.hpp"
+
+#include <dlib/matrix.h>
+#include <dlib/numeric_constants.h>
+#include <cmath>
+
+using cru::platform::Point;
+
+using matrix14 = dlib::matrix<float, 1, 4>;
+using matrix13 = dlib::matrix<float, 1, 3>;
+using matrix44 = dlib::matrix<float, 4, 4>;
+
+matrix44 Identity() {
+  matrix44 m;
+  m = dlib::identity_matrix<float, 4>();
+  return m;
+}
+
+matrix44 T1(float a, float b, float c) {
+  auto m = Identity();
+
+  m(0, 3) = -a;
+  m(1, 3) = -b;
+  m(2, 3) = -c;
+
+  return m;
+}
+
+matrix44 T2(float theta) {
+  auto m = Identity();
+
+  m(0, 0) = -std::cos(theta);
+  m(0, 2) = -std::sin(theta);
+  m(2, 0) = std::sin(theta);
+  m(2, 2) = -std::cos(theta);
+
+  return m;
+}
+
+matrix44 T3(float phi) {
+  auto m = Identity();
+
+  m(1, 1) = std::sin(phi);
+  m(1, 2) = -std::cos(phi);
+  m(2, 1) = std::cos(phi);
+  m(2, 2) = std::sin(phi);
+
+  return m;
+}
+
+matrix44 T4(float alpha) {
+  auto m = Identity();
+
+  m(0, 0) = std::cos(alpha);
+  m(1, 0) = std::sin(alpha);
+  m(0, 1) = -std::sin(alpha);
+  m(1, 1) = std::cos(alpha);
+
+  return m;
+}
+
+matrix44 T5() {
+  auto m = Identity();
+
+  m(0, 0) = -1;
+
+  return m;
+}
+
+struct Args {
+  float a;
+  float b;
+  float c;
+  float theta;
+  float phi;
+  float alpha;
+};
+
+matrix44 Tv(Args args) {
+  return T1(args.a, args.b, args.c) * T2(args.theta) * T3(args.phi) *
+         T4(args.alpha) * T5();
+}
+
+matrix14 Transform(matrix14 point, Args args) { return point * Tv(args); }
+
+matrix14 Transform(matrix13 point, Args args) {
+  return matrix14{point(0), point(1), point(2), 1} * Tv(args);
+}
+
+Point TransformTo2D(matrix14 point, float d) {
+  return Point{point(1), point(2)};
+}
+
+const float length = 100;
+
+matrix13 points[] = {
+    {0, 0, 0},
+    {length, 0, 0},
+    {length, 0, 0},
+    {length, length, 0},
+    {length, length, 0},
+    {0, length, 0},
+    {0, length, 0},
+    {0, 0, 0},
+    {0, 0, 0},
+    {0, 0, length},
+    {length, 0, 0},
+    {length, 0, length},
+    {length, length, 0},
+    {length, length, length},
+    {0, length, 0},
+    {0, length, length},
+    {0, 0, length},
+    {length, 0, length},
+    {length, 0, length},
+    {length, length, length},
+    {length, length, length},
+    {0, length, length},
+    {0, length, length},
+    {0, 0, length},
+};
+
+const float pi = static_cast<float>(dlib::pi);
+
+Args args{30, 40, 50, pi / 3.f, pi / 4.f, pi / 5.f};
+
+int main() {
+  std::vector<Point> points2d;
+
+  for (auto p : points) {
+    auto point2d = TransformTo2D(Transform(std::move(p), args), length);
+    points2d.push_back(point2d);
+  }
+
+  auto application = cru::platform::bootstrap::CreateUiApplication();
+  auto window = application->CreateWindow();
+
+  auto brush = application->GetGraphicsFactory()->CreateSolidColorBrush(
+      cru::platform::colors::black);
+
+  window->SetClientSize(cru::platform::Size(400, 400));
+
+  window->PaintEvent()->AddHandler([window, &brush, points2d](nullptr_t) {
+    auto painter = window->BeginPaint();
+    painter->PushState();
+    painter->ConcatTransform(cru::platform::Matrix::Translation(200, 200));
+    for (int i = 0; i < points2d.size(); i += 2) {
+      painter->DrawLine(points2d[i], points2d[i + 1], brush.get(), 1.f);
+    }
+    painter->PopState();
+  });
+
+  window->SetVisibility(cru::platform::gui::WindowVisibilityType::Show);
+
+  return application->Run();
+}
diff --git a/demos/graphics_experiments/CMakeLists.txt b/demos/graphics_experiments/CMakeLists.txt
index 2e0237aa..103d1cc4 100644
--- a/demos/graphics_experiments/CMakeLists.txt
+++ b/demos/graphics_experiments/CMakeLists.txt
@@ -3,3 +3,8 @@ target_link_libraries(cru_graphics_experiment_1 PRIVATE cru_demo_base)
 
 add_executable(cru_graphics_experiment_2 2.cpp)
 target_link_libraries(cru_graphics_experiment_2 PRIVATE cru_demo_base)
+
+find_package(dlib CONFIG REQUIRED)
+
+add_executable(cru_graphics_experiment_4 4.cpp)
+target_link_libraries(cru_graphics_experiment_4 PRIVATE cru_demo_base dlib::dlib)