8 files changed, 118 insertions, 13 deletions

diff --git a/engine/CMakeLists.txt b/engine/CMakeLists.txt
index 7cb7f20..266e109 100644
--- a/engine/CMakeLists.txt
+++ b/engine/CMakeLists.txt
@@ -4,6 +4,7 @@ add_library(
 	src/Camera.cpp
 	src/Clock.cpp
 	src/Point.cpp
+	src/Rect.cpp
 )
 target_include_directories(
 	${PROJECT_NAME}
diff --git a/engine/include/kurator/engine/Point.h b/engine/include/kurator/engine/Point.h
index 4b352d6..eecf2c6 100644
--- a/engine/include/kurator/engine/Point.h
+++ b/engine/include/kurator/engine/Point.h
@@ -23,6 +23,7 @@ struct Point
 	Point subtract(double _x, double _y) const;
 	bool operator==(const Point& other) const;
 	bool operator!=(const Point& other) const;
+	friend Point abs(const Point& point);
 };
 
 
diff --git a/engine/include/kurator/engine/Rect.h b/engine/include/kurator/engine/Rect.h
new file mode 100644
index 0000000..d485937
--- /dev/null
+++ b/engine/include/kurator/engine/Rect.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "Point.h"
+
+
+namespace kurator
+{
+namespace engine
+{
+
+
+struct Rect
+{
+	Rect();
+	Rect(const Point& first, const Point& second);
+	Point position;
+	Point size;
+	Point topleft() const;
+	Point bottomright() const;
+	Point center() const;
+	bool contains(const Point& point);
+	bool contains(const Point& circle, double radius);
+};
+
+
+}  // namespace engine
+}  // namespace kurator
diff --git a/engine/src/Point.cpp b/engine/src/Point.cpp
index e01de57..8dd50bd 100644
--- a/engine/src/Point.cpp
+++ b/engine/src/Point.cpp
@@ -96,5 +96,12 @@ Point::operator!=(const Point& other) const
 }
 
 
+Point
+abs(const Point& point)
+{
+	return {std::abs(point.x), std::abs(point.y)};
+}
+
+
 }  // namespace engine
 }  // namespace kurator
diff --git a/engine/src/Rect.cpp b/engine/src/Rect.cpp
new file mode 100644
index 0000000..293e099
--- /dev/null
+++ b/engine/src/Rect.cpp
@@ -0,0 +1,74 @@
+#include <kurator/engine/Rect.h>
+
+#include <algorithm>
+#include <cmath>
+
+#include <raylib.h>
+
+#include <kurator/engine/Point.h>
+
+
+using std::abs;
+
+
+namespace kurator
+{
+namespace engine
+{
+
+
+Rect::Rect() :
+	position {0, 0},
+	size {0, 0}
+{
+}
+
+
+Rect::Rect(const Point& first, const Point& second) :
+	position {std::min(first.x, second.x), std::min(first.y, second.y)},
+	size {abs(second - first)}
+{
+}
+
+
+Point Rect::topleft() const
+{
+	return position;
+}
+
+
+Point Rect::bottomright() const
+{
+	return position + size;
+}
+
+
+Point Rect::center() const
+{
+	return position + size.scale(0.5);
+}
+
+
+bool Rect::contains(const Point& point)
+{
+	const auto br = bottomright();
+	return point.x >= position.x && point.x <= br.x && point.y >= position.y && point.y <= br.y;
+}
+
+
+bool Rect::contains(const Point& circle, double radius)
+{
+	return CheckCollisionCircleRec(
+		{static_cast<float>(circle.x), static_cast<float>(circle.y)},
+		radius,
+		{
+			static_cast<float>(position.x),
+			static_cast<float>(position.y),
+			static_cast<float>(size.x),
+			static_cast<float>(size.y)
+		});
+}
+
+
+}  // namespace engine
+}  // namespace kurator
diff --git a/kurator/src/Controller.cpp b/kurator/src/Controller.cpp
index d7efcdb..3512f3e 100644
--- a/kurator/src/Controller.cpp
+++ b/kurator/src/Controller.cpp
@@ -26,15 +26,8 @@ void Controller::update(sim::State& ctx)
 void Controller::draw(const sim::State&) const
 {
 	if (mouse.is_dragging()) {
-		const auto pos = mouse.position();
-		const auto start = mouse.start();
-		const auto diff = start - pos;
-		DrawRectangleLines(
-			std::min(pos.x, start.x),
-			std::min(pos.y, start.y),
-			std::abs(diff.x),
-			std::abs(diff.y),
-			GRAY);
+		const auto rect = mouse.selection();
+		DrawRectangleLines(rect.position.x, rect.position.y, rect.size.x, rect.size.y, GRAY);
 	}
 }
 
diff --git a/kurator/src/Mouse.cpp b/kurator/src/Mouse.cpp
index e66d869..aeaa8e5 100644
--- a/kurator/src/Mouse.cpp
+++ b/kurator/src/Mouse.cpp
@@ -3,6 +3,7 @@
 #include <raylib.h>
 
 #include <kurator/engine/Point.h>
+#include <kurator/engine/Rect.h>
 
 
 namespace kurator
@@ -30,10 +31,10 @@ Mouse::position() const
 }
 
 
-engine::Point
-Mouse::start() const
+engine::Rect
+Mouse::selection() const
 {
-	return start_;
+	return {start_, position()};
 }
 
 
diff --git a/kurator/src/Mouse.h b/kurator/src/Mouse.h
index c5c1f0e..81afe2c 100644
--- a/kurator/src/Mouse.h
+++ b/kurator/src/Mouse.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <kurator/engine/Point.h>
+#include <kurator/engine/Rect.h>
 
 
 namespace kurator
@@ -13,7 +14,7 @@ public:
 	Mouse();
 	void update();
 	engine::Point position() const;
-	engine::Point start() const;
+	engine::Rect selection() const;
 	bool is_dragging() const;
 private:
 	engine::Point start_;