From 6b7d0e795bc57856a1bcaaab08229bb0869e8516 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Fri, 3 Feb 2023 23:53:33 +0100
Subject: Extracted from/to camera viewport transformations to camera itself

---
 engine/CMakeLists.txt                  |  5 +++++
 engine/include/kurator/engine/Camera.h |  2 ++
 engine/include/kurator/engine/Point.h  |  2 ++
 engine/src/Camera.cpp                  | 39 ++++++++++++++++++++++++++++++++++
 engine/src/Point.cpp                   | 16 +++++++++++++-
 5 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 engine/src/Camera.cpp

(limited to 'engine')

diff --git a/engine/CMakeLists.txt b/engine/CMakeLists.txt
index 041965a..1ffbd98 100644
--- a/engine/CMakeLists.txt
+++ b/engine/CMakeLists.txt
@@ -1,9 +1,14 @@
 project(engine)
 add_library(
 	${PROJECT_NAME} STATIC
+	src/Camera.cpp
 	src/Point.cpp
 )
 target_include_directories(
 	${PROJECT_NAME}
 	PUBLIC include
 )
+target_link_libraries(
+	${PROJECT_NAME}
+	PRIVATE raylib
+)
diff --git a/engine/include/kurator/engine/Camera.h b/engine/include/kurator/engine/Camera.h
index abe0ffe..2eb192a 100644
--- a/engine/include/kurator/engine/Camera.h
+++ b/engine/include/kurator/engine/Camera.h
@@ -13,6 +13,8 @@ struct Camera
 {
 	Point offset = {};
 	double scale = 1.0;
+	Point to_world(const Point& screen) const;
+	Point to_screen(const Point& world) const;
 };
 
 
diff --git a/engine/include/kurator/engine/Point.h b/engine/include/kurator/engine/Point.h
index 0e9f0ab..3dc0c8b 100644
--- a/engine/include/kurator/engine/Point.h
+++ b/engine/include/kurator/engine/Point.h
@@ -19,6 +19,8 @@ struct Point
 	Point normalized() const;
 	Point operator-(const Point& other) const;
 	Point operator+(const Point& other) const;
+	Point subtract(const Point& other) const;
+	Point subtract(double _x, double _y) const;
 };
 
 
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
-- 
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