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#include <cuda-samples/Common/helper_math.h>
#include <glm/gtx/quaternion.hpp>
#include "SFML/Window/Event.hpp"
class Camera {
private:
glm::quat _rotation;
glm::vec3 _target;
glm::vec3 _position;
glm::vec3 _forward;
glm::vec3 _right;
glm::vec3 _up;
float _distance;
bool _dragging;
bool _moving;
float2 _lastMouse;
public:
Camera(float3 target, float distance):
_distance(distance),
_target(target.x, target.y, target.z),
_dragging(false),
_moving(false) {
update();
}
void update() {
_position = _target + glm::axis(_rotation * glm::quat(0, 0, _distance, 0) * glm::conjugate(_rotation));
_forward = glm::normalize(_target - _position);
_right = glm::axis(_rotation * glm::quat(0, -1, 0, 0) * glm::conjugate(_rotation));
_up = glm::axis(_rotation * glm::quat(0, glm::cross(glm::vec3(0, 1, 0), glm::vec3(-1, 0, 0))) * glm::conjugate(_rotation));
}
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:
float2 mouse = make_float2(event.mouseMove.x, event.mouseMove.y);
if (_dragging) {
float2 delta = 0.005 * (mouse - _lastMouse);
glm::quat rotation_z = glm::vec3(0,0,delta.x);
glm::quat rotation_x = glm::vec3(delta.y,0,0);
_rotation *= glm::cross(rotation_x, rotation_z);
}
if (_moving) {
float2 delta = 0.04 * (mouse - _lastMouse);
_target += _right*delta.x + _up*delta.y;
}
_lastMouse = mouse;
break;
}
update();
}
float3 getPosition() const {
return make_float3(_position.x, _position.y, _position.z);
}
float3 getForward() const {
return make_float3(_forward.x, _forward.y, _forward.z);
}
float3 getRight() const {
return make_float3(_right.x, _right.y, _right.z);
}
float3 getUp() const {
return make_float3(_up.x, _up.y, _up.z);
}
};
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