...

3 files changed, 82 insertions, 1 deletions

diff --git a/demos/CMakeLists.txt b/demos/CMakeLists.txt
index 3edabd0a..cb9d3f6e 100644
--- a/demos/CMakeLists.txt
+++ b/demos/CMakeLists.txt
@@ -2,7 +2,7 @@ add_library(cru_demo_base INTERFACE)
 
 target_link_libraries(cru_demo_base INTERFACE cru_platform_bootstrap)
 
-if(WIN32) # Currently only enable tests on Windows.
+if(WIN32)
 	add_subdirectory(main)
 	add_subdirectory(scroll_view)
 
@@ -12,6 +12,7 @@ elseif(APPLE)
 	add_subdirectory(scroll_view)
 
 	add_subdirectory(input_method)
+	add_subdirectory(graphics_experiments)
 elseif(UNIX)
 	add_subdirectory(xcb)
 endif()
diff --git a/demos/graphics_experiments/1/main.cpp b/demos/graphics_experiments/1/main.cpp
new file mode 100644
index 00000000..926557e7
--- /dev/null
+++ b/demos/graphics_experiments/1/main.cpp
@@ -0,0 +1,76 @@
+#include "cru/platform/Color.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 <functional>
+
+void BresenhamDrawLine(int x1, int y1, int x2, int y2,
+                       const std::function<void(int, int)>& draw_pixel) {
+  // calculating range for line between start and end point
+  int dx = x2 - x1;
+  int dy = y2 - y1;
+
+  int x = x1;
+  int y = y1;
+
+  // this is the case when slope(m) < 1
+  if (abs(dx) > abs(dy)) {
+    draw_pixel(x, y);  // this putpixel is for very first pixel of the line
+    int pk = (2 * abs(dy)) - abs(dx);
+
+    for (int i = 0; i < abs(dx); i++) {
+      x = x + 1;
+      if (pk < 0)
+        pk = pk + (2 * abs(dy));
+      else {
+        y = y + 1;
+        pk = pk + (2 * abs(dy)) - (2 * abs(dx));
+      }
+      draw_pixel(x, y);
+    }
+  } else {
+    // this is the case when slope is greater than or equal to 1  i.e: m>=1
+    draw_pixel(x, y);  // this putpixel is for very first pixel of the line
+    int pk = (2 * abs(dx)) - abs(dy);
+
+    for (int i = 0; i < abs(dy); i++) {
+      y = y + 1;
+      if (pk < 0)
+        pk = pk + (2 * abs(dx));
+      else {
+        x = x + 1;
+        pk = pk + (2 * abs(dx)) - (2 * abs(dy));
+      }
+
+      draw_pixel(x, y);  // display pixel at coordinate (x, y)
+    }
+  }
+}
+
+int main() {
+  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, 200));
+
+  window->PaintEvent()->AddHandler([window, &brush](nullptr_t) {
+    auto painter = window->BeginPaint();
+    auto draw_pixel = [&painter, &brush](int x, int y) {
+      painter->FillRectangle({static_cast<float>(x) - 0.5f,
+                              static_cast<float>(y) - 0.5f, 1.0f, 1.0f},
+                             brush.get());
+    };
+    BresenhamDrawLine(50, 50, 100, 200, draw_pixel);
+    BresenhamDrawLine(50, 50, 200, 100, draw_pixel);
+  });
+
+  window->SetVisibility(cru::platform::gui::WindowVisibilityType::Show);
+
+  return application->Run();
+}
diff --git a/demos/graphics_experiments/CMakeLists.txt b/demos/graphics_experiments/CMakeLists.txt
new file mode 100644
index 00000000..cc0ce99a
--- /dev/null
+++ b/demos/graphics_experiments/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_executable(cru_graphics_experiment_1
+    1/main.cpp
+)
+target_link_libraries(cru_graphics_experiment_1 PRIVATE cru_demo_base)