Camera Class Reference

#include <BoardManager.h>

Collaboration diagram for Camera:

Public Member Functions
	Camera ()
void	pan (glm::vec2 delta)
void	zoom (float factor, glm::vec2 mouse_world_pos_before_zoom)
void	setPosition (glm::vec2 newPosition)
glm::vec2	getPosition () const
void	setZoom (float newZoomLevel)
float	getZoom () const
glm::mat4	getViewMatrix () const
glm::mat4	getProjectionMatrix () const
glm::vec2	worldToScreenPosition (glm::vec2 world_position) const
glm::vec2	fboToNdcPos (glm::vec2 fbo_pixel_top_left_origin) const
glm::vec2	screenToWorldPosition (glm::vec2 fbo_pixel_top_left_origin) const
void	setFboDimensions (glm::vec2 dims)

Private Attributes
glm::vec2	position
float	zoom_level
glm::vec2	fbo_dimensions

Detailed Description

Definition at line 32 of file BoardManager.h.

Constructor & Destructor Documentation

Camera()

Camera::Camera ( )

inline

Definition at line 35 of file BoardManager.h.

             :
        position(0.0f, 0.0f), zoom_level(1.0f), fbo_dimensions(0, 0) {} // Set initial zoom to 1.0f for no scaling by default

Member Function Documentation

fboToNdcPos()

glm::vec2 Camera::fboToNdcPos ( glm::vec2 fbo_pixel_top_left_origin ) const

inline

Definition at line 115 of file BoardManager.h.

    {
        glm::vec2 ndc;
        ndc.x = (2.0f * fbo_pixel_top_left_origin.x) / fbo_dimensions.x - 1.0f;
        ndc.y = 1.0f - (2.0f * fbo_pixel_top_left_origin.y) / fbo_dimensions.y;
        return ndc;
    }

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getPosition()

glm::vec2 Camera::getPosition ( ) const

inline

Definition at line 61 of file BoardManager.h.

    {
        return position;
    }

getProjectionMatrix()

glm::mat4 Camera::getProjectionMatrix ( ) const

inline

Definition at line 82 of file BoardManager.h.

    {
        float half_width = (fbo_dimensions.x / 2.0f) / zoom_level;
        float half_height = (fbo_dimensions.y / 2.0f) / zoom_level;
        return glm::ortho(-half_width, half_width, half_height, -half_height, -1.0f, 1.0f);
    }

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getViewMatrix()

glm::mat4 Camera::getViewMatrix ( ) const

inline

Definition at line 77 of file BoardManager.h.

    {
        return glm::translate(glm::mat4(1.0f), glm::vec3(-position.x, -position.y, 0.0f));
    }

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getZoom()

float Camera::getZoom ( ) const

inline

Definition at line 72 of file BoardManager.h.

    {
        return zoom_level;
    }

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pan()

void Camera::pan ( glm::vec2 delta )

inline

Definition at line 38 of file BoardManager.h.

    {
        position += delta;
    }

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screenToWorldPosition()

glm::vec2 Camera::screenToWorldPosition ( glm::vec2 fbo_pixel_top_left_origin ) const

inline

Definition at line 123 of file BoardManager.h.

    {
 
        glm::vec2 ndc = fboToNdcPos(fbo_pixel_top_left_origin);
        glm::vec4 ndc_homogeneous = glm::vec4(ndc.x, ndc.y, 0.0f, 1.0f);
        glm::mat4 inverse_pv_matrix = glm::inverse(getProjectionMatrix() * getViewMatrix());
        glm::vec4 world_homogeneous = inverse_pv_matrix * ndc_homogeneous;
        glm::vec2 world_position;
        if (world_homogeneous.w != 0.0f)
        {
            world_position.x = world_homogeneous.x / world_homogeneous.w;
            world_position.y = world_homogeneous.y / world_homogeneous.w;
        }
        else
        {
            return glm::vec2(NAN, NAN); // Indicate invalid result
        }
 
        return world_position;
    }

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setFboDimensions()

void Camera::setFboDimensions ( glm::vec2 dims )

inline

Definition at line 144 of file BoardManager.h.

    {
        fbo_dimensions = dims;
    }

setPosition()

void Camera::setPosition ( glm::vec2 newPosition )

inline

Definition at line 56 of file BoardManager.h.

    {
        position = newPosition;
    }

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setZoom()

void Camera::setZoom ( float newZoomLevel )

inline

Definition at line 66 of file BoardManager.h.

    {
        zoom_level = newZoomLevel;
        zoom_level = glm::clamp(zoom_level, 0.1f, 10.0f);
    }

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worldToScreenPosition()

glm::vec2 Camera::worldToScreenPosition ( glm::vec2 world_position ) const

inline

Definition at line 89 of file BoardManager.h.

    {
        glm::vec4 world_homogeneous = glm::vec4(world_position.x, world_position.y, 0.0f, 1.0f);
        /*glm::vec4 camera_coords = getViewMatrix() * world_homogeneous;
        glm::vec4 clip_coords = getProjectionMatrix() * camera_coords;*/
 
        glm::mat4 pv_matrix = getProjectionMatrix() * getViewMatrix(); // Combine PV matrix
        glm::vec4 clip_coords = pv_matrix * world_homogeneous;
 
        glm::vec2 ndc;
        if (clip_coords.w != 0.0f)
        { // Avoid division by zero
            ndc.x = clip_coords.x / clip_coords.w;
            ndc.y = clip_coords.y / clip_coords.w;
        }
        else
        {
            return glm::vec2(NAN, NAN); // Indicate invalid position
        }
        glm::vec2 fbo_pixel_top_left_origin;
        fbo_pixel_top_left_origin.x = (ndc.x + 1.0f) * 0.5f * fbo_dimensions.x;
        fbo_pixel_top_left_origin.y = (1.0f - ndc.y) * 0.5f * fbo_dimensions.y;
 
        return fbo_pixel_top_left_origin;
    }

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zoom()

void Camera::zoom ( float factor, glm::vec2 mouse_world_pos_before_zoom )

inline

Definition at line 43 of file BoardManager.h.

    {
        float old_zoom_level = zoom_level;
        zoom_level *= factor;
        zoom_level = glm::clamp(zoom_level, 0.05f, 20.0f); // Example limits
        if (zoom_level == old_zoom_level)
        {
            return;
        }
        float zoom_ratio = zoom_level / old_zoom_level;
        position = mouse_world_pos_before_zoom - (mouse_world_pos_before_zoom - position) / zoom_ratio;
    }

Member Data Documentation

fbo_dimensions

glm::vec2 Camera::fbo_dimensions

private

Definition at line 152 of file BoardManager.h.

position

glm::vec2 Camera::position

private

Definition at line 150 of file BoardManager.h.

zoom_level

float Camera::zoom_level

private

Definition at line 151 of file BoardManager.h.

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The documentation for this class was generated from the following file:

• include/BoardManager.h