From 4ec94c97879aafef15f7663135745e4ba61e62cf Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 17 May 2021 00:15:33 +0200
Subject: Extract first public LiterateLB version

---
 tangle/util/camera.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 tangle/util/camera.h

(limited to 'tangle/util/camera.h')

diff --git a/tangle/util/camera.h b/tangle/util/camera.h
new file mode 100644
index 0000000..0a793d3
--- /dev/null
+++ b/tangle/util/camera.h
@@ -0,0 +1,86 @@
+#include <cuda-samples/Common/helper_math.h>
+#include "SFML/Window/Event.hpp"
+
+class Camera {
+private:
+  float _distance;
+  float _phi;
+  float _psi;
+  float3 _target;
+  float3 _eye;
+  float3 _direction;
+  bool _dragging;
+  bool _moving;
+  float2 _lastMouse;
+
+public:
+  Camera(float3 target, float distance, float phi, float psi):
+    _distance(distance),
+    _phi(phi),
+    _psi(psi),
+    _target(target),
+    _dragging(false),
+    _moving(false) {
+    update();
+  }
+
+  void update() {
+    _eye = _target + make_float3(_distance*sin(_psi)*cos(_phi), _distance*sin(_psi)*sin(_phi), _distance*cos(_psi));
+    _direction = normalize(_target - _eye);
+  }
+
+  void handle(sf::Event& event) {
+    switch (event.type) {
+    case sf::Event::MouseWheelMoved:
+      _distance -= event.mouseWheel.delta * 10;
+      break;
+    case sf::Event::MouseButtonPressed:
+      if (event.mouseButton.button == sf::Mouse::Left) {
+        _dragging = true;
+        _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
+      } else if (event.mouseButton.button == sf::Mouse::Right) {
+        _moving = true;
+        _lastMouse = make_float2(event.mouseButton.x, event.mouseButton.y);
+      }
+      break;
+    case sf::Event::MouseButtonReleased:
+      if (event.mouseButton.button == sf::Mouse::Left) {
+        _dragging = false;
+      } else if (event.mouseButton.button == sf::Mouse::Right) {
+        _moving = false;
+      }
+      break;
+    case sf::Event::MouseMoved:
+      if (_dragging) {
+        float2 mouse = make_float2(event.mouseMove.x, event.mouseMove.y);
+        float2 delta = mouse - _lastMouse;
+        _lastMouse = mouse;
+        _phi += 0.4*delta.x * 2*M_PI/360;
+        if (delta.y > 0 && _psi <= M_PI-2*M_PI/60) {
+          _psi += 0.4*delta.y * M_PI/180;
+        } else if (delta.y < 0 && _psi >= 2*M_PI/60) {
+          _psi += 0.4*delta.y * M_PI/180;
+        }
+      }
+      if (_moving) {
+        float2 mouse = make_float2(event.mouseMove.x, event.mouseMove.y);
+        float2 delta = mouse - _lastMouse;
+        _lastMouse = mouse;
+        float3 forward = normalize(_target - _eye);
+    	   float3 right   = normalize(cross(make_float3(0.f, 0.f, -1.f), forward));
+        float3 up      = cross(right, forward);
+        _target += 0.4*right*delta.x - 0.4*up*delta.y;
+      }
+      break;
+    }
+    update();
+  }
+
+  float3 getDirection() const {
+    return _direction;
+  }
+
+  float3 getEyePosition() const {
+    return _eye;
+  }
+};
-- 
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