Extracted from/to camera viewport transformations to camera itself

2 files changed, 54 insertions, 1 deletions

diff --git a/engine/src/Camera.cpp b/engine/src/Camera.cpp
new file mode 100644
index 0000000..60e8aa1
--- /dev/null
+++ b/engine/src/Camera.cpp
@@ -0,0 +1,39 @@
+#include <kurator/engine/Camera.h>
+
+#include <raylib.h>
+
+#include <kurator/engine/Point.h>
+
+
+namespace kurator
+{
+namespace engine
+{
+
+
+static auto viewport() -> Point;
+
+
+Point
+Camera::to_world(const Point& screen) const
+{
+	return screen - viewport().scale(1.0 / (2.0 * scale)) + offset;
+}
+
+
+Point
+Camera::to_screen(const Point& world) const
+{
+	return (world - offset).scale(scale) + viewport().scale(0.5);
+}
+
+
+Point
+viewport()
+{
+	return {static_cast<double>(GetScreenWidth()), static_cast<double>(GetScreenHeight())};
+}
+
+
+}  // namespace engine
+}  // namespace kurator
diff --git a/engine/src/Point.cpp b/engine/src/Point.cpp
index b5ce4eb..f02991c 100644
--- a/engine/src/Point.cpp
+++ b/engine/src/Point.cpp
@@ -57,7 +57,7 @@ Point::normalized() const
 Point
 Point::operator-(const Point& other) const
 {
-	return {x - other.x, y - other.y};
+	return subtract(other);
 }
 
 
@@ -68,5 +68,19 @@ Point::operator+(const Point& other) const
 }
 
 
+Point
+Point::subtract(const Point& other) const
+{
+	return {x - other.x, y - other.y};
+}
+
+
+Point
+Point::subtract(const double _x, const double _y) const
+{
+	return {x - _x, y - _y};
+}
+
+
 }  // namespace engine
 }  // namespace kurator