add: RenderTarget

frame/CMakeLists.txt

@@ -8,6 +8,9 @@ set(src
     src/display/IDisplay.hpp
     src/display/EPD_7in5_V2.hpp 
     src/display/EPD_7in5_V2.cpp 
+    src/render/RenderTarget.hpp
+    src/render/RenderTarget.cpp
+
 )
 
 add_executable(${target} ${src})

frame/src/Color.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <cstdint>
+
+namespace frame
+{
+    enum Color : uint32_t { WHITE = 0, BLACK = 0xFF };
+}

frame/src/Size.hpp

@@ -9,4 +9,10 @@ namespace frame
         uint32_t width;
         uint32_t height;
     };
+
+    inline Size operator/(Size const& size, int div)
+    {
+        return {size.width / div, size.height / div};
+    }
+
 } // namespace frame

frame/src/Vector.hpp

@@ -0,0 +1,56 @@
+#pragma once
+
+#include "Size.hpp"
+
+namespace frame
+{
+    struct Vector
+    {
+        int32_t x;
+        int32_t y;
+
+        Vector() = default;
+        Vector(int32_t x, int32_t)
+            : x(x)
+            , y(y)
+        {
+        }
+
+        Vector(Size const& size)
+            : x(size.width)
+            , y(size.width)
+        {
+        }
+
+        void operator=(Size const& size)
+        {
+            x = size.width;
+            y = size.height;
+        }
+    };
+
+    inline bool operator==(Vector const& a, Vector const& b)
+    {
+        return a.x == b.x && a.y == b.y;
+    }
+
+    inline bool operator!=(Vector const& a, Vector const& b)
+    {
+        return !(a == b);
+    }
+
+    inline Vector& operator+=(Vector& a, Vector const& b)
+    {
+        a.x += b.x;
+        a.y += b.y;
+        return a;
+    }
+
+    inline Vector& operator-=(Vector& a, Vector const& b)
+    {
+        a.x -= b.x;
+        a.y -= b.y;
+        return a;
+    }
+
+} // namespace frame

frame/src/main.cpp

@@ -6,6 +6,7 @@
 using namespace std::chrono_literals;
 
 #include "display/EPD_7in5_V2.hpp"
+#include "render/RenderTarget.hpp"
 
 int main()
 {
@@ -14,34 +15,22 @@ int main()
 
     display.Init();
 
-    display.Clear(frame::display::Color::BLACK);
-
-    std::this_thread::sleep_for(2s);
-
     display.Clear(frame::display::Color::WHITE);
 
-    std::this_thread::sleep_for(2s);
+    frame::render::RenderTarget target(display.getSize());
 
-    frame::Image image(display.getSize());
+    frame::Vector const center = (display.getSize() / 2);
 
-    for(int y = 0; y < 1; ++y)
+    for(int i = 0; i < 360; i += 45)
     {
-        for(int x = 0; x < image.getWidth(); ++x)
+        auto end = center;
-        {
+        end.x += (int)std::cos(i * 0.01745329);
-            image.at(x, y) = 0xFF;
+        end.y += (int)std::sin(i * 0.01745329);
-        }
+
+        target.DrawLine(center, end);
     }
 
-    for(int y = image.getHeight() - 1; y < image.getHeight(); ++y)
+    display.Display(target.getImage());
-    {
-        for(int x = 0; x < image.getWidth(); ++x)
-        {
-            image.at(x, y) = 0xFF;
-        }
-    }
-
-
-    display.Display(image);
 
     std::this_thread::sleep_for(10s);
 

frame/src/render/RenderTarget.cpp

@@ -0,0 +1,49 @@
+#include "RenderTarget.hpp"
+
+namespace frame::render
+{
+
+    RenderTarget::RenderTarget(Size size)
+        : image(size)
+    {
+    }
+
+    void RenderTarget::DrawPixel(Vector const& position, Color color)
+    {
+        image.at(position.x, position.y) = color;
+    }
+
+    void RenderTarget::DrawLine(Vector const& start,
+                                Vector const& end,
+                                Color color)
+    {
+        auto const deltaX = std::abs(start.x - end.x);
+        auto const deltaY = std::abs(start.y - end.y);
+
+        auto const rX = start.x < end.x ? 1 : -1;
+        auto const rY = start.y < end.y ? 1 : -1;
+
+        auto pos = start;
+        auto E   = 2 * deltaY - deltaX;
+
+        DrawPixel(pos, color);
+
+        while(pos != end)
+        {
+            if(E <= 0)
+            {
+                pos.x += rX;
+
+                E += 2 * deltaY;
+            } else
+            {
+                pos.x += rX;
+                pos.y += rY;
+
+                E += 2 * deltaY - 2 * deltaX;
+            }
+            DrawPixel(pos, color);
+        }
+    }
+
+} // namespace frame::render

frame/src/render/RenderTarget.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "../Color.hpp"
+#include "../Image.hpp"
+#include "../Vector.hpp"
+
+namespace frame::render
+{
+
+    class RenderTarget
+    {
+        Image image;
+
+    public:
+        RenderTarget(Size size);
+
+        void DrawPixel(Vector const& position, Color color);
+
+        void DrawLine(Vector const& start,
+                      Vector const& end,
+                      Color color = BLACK);
+
+        Image const& getImage()
+        {
+            return image;
+        }
+    };
+
+} // namespace frame::render