Arcball-Graphics-Package | Improved Arcball Implementation with quaternion class

This is an example of common usage of the library. I've tried to make the functionality as self-evident and obvious as possible. Set With Euler Angles. Multiply a Matrix with Another Matrix Transposed. Cross Product of two 3 Dimensional Vectors. Normalize a 3 Dimensional Vector. Prints a 4x4 matrix. Calculate Magnitude of a Vec3. Calculate Difference of a Vec3.
Initalizaiton arcball arc; arc.SetCamera(camera, up_vector); arc.SetCenter(center_pos); arc.SetViewArea(window_width,window_height); // can omit these if okay with default values arc.SetProjectionVars(fov, z_near, z_far); arc.rotate_sensitivity = 0.004; arc.zoom_sensitivity = 0.2; arc.zoom_translate_sensitivity = 0.1;
Rotate Function if(is_scroll_clicked){ arc.Rotate(mouse_delta_x, mouse_delta_y); camera_pos = arc.Camera(); // If Needed for Shader click_delta_x = 0; click_delta_y = 0; }
Zoom Function if(is_scrolled){ // Distance From Center of Screen. Left and Up are Positive // Float Type Because of Possible Subpixel Resolution From OS float dis_x = 0.5*window_width - mouse_x; float dis_y = 0.5*window_height - mouse_y; arc.Zoom(dis_x, dis_y, scroll_ammount); camera_pos = arc.Camera(); // If Needed for Shader is_scrolled = false; }
Translate Function if(is_left_clicked){ arc.Translate(mouse_delta_x, mouse_delta_y); camera_pos = arc.Camera(); // If Needed for Shader }
ViewProjMatrix Function // Creates View Projection Matrix in Location Pointed to by viewproj float viewproj[16]; arc.ViewProjMatrix(viewproj);
MouseRay Function // Gets Direction Vector of Mouse Ray From Camera float ray[3]; arc.MouseRay(ray);