#include <jo/jo.h> // Structure to store the cube's position and velocity typedef struct { jo_pos3Df position; float velocity_y; float velocity_x; // Horizontal velocity bool is_jumping; } Cube; // Cube instance Cube cube; // Position and rotation structures jo_pos3Df pos; jo_rot3Df rot; jo_palette image_pal; // Camera structure jo_camera cam; // Definition of the cube's vertices and quads jo_vertice cube_vertices[] = JO_3D_CUBE_VERTICES(32); jo_3d_quad cube_quads[6]; // Constants const float GRAVITY = 1.0f; // Gravity force const float JUMP_VELOCITY = 15.0f; // Initial jump velocity const float GROUND_Y = 0.0f; // Ground position const float MOVE_SPEED = 2.0f; // Horizontal movement speed // Function to create the cube void create_cube(void) { int i; jo_3d_create_cube(cube_quads, cube_vertices); for (i = 0; i < 6; ++i) jo_3d_set_texture(&cube_quads[i], 0); } // Function to initialize the cube void init_cube(void) { cube.position.x = 0.0f; cube.position.y = GROUND_Y; cube.position.z = 0.0f; cube.velocity_y = 0.0f; cube.velocity_x = MOVE_SPEED; // Initialize horizontal velocity cube.is_jumping = false; } // Function to update the cube's position void update_cube_position(void) { // Continuous horizontal movement cube.position.x += cube.velocity_x; if (cube.is_jumping) { // Update Y position with the current velocity cube.position.y -= cube.velocity_y; // Apply gravity cube.velocity_y -= GRAVITY; // Check if the cube has returned to the ground if (cube.position.y >= GROUND_Y) { cube.position.y = GROUND_Y; cube.is_jumping = false; cube.velocity_y = 0.0f; } } else { // Detect button C to initiate a jump if (jo_is_pad1_key_down(JO_KEY_C)) { cube.is_jumping = true; cube.velocity_y = JUMP_VELOCITY; } } } // Function to draw the cube void draw_cube(void) { jo_3d_push_matrix(); { jo_3d_translate_matrixf(cube.position.x, cube.position.y, cube.position.z); jo_3d_draw_array(cube_quads, 6); } jo_3d_pop_matrix(); } // Function to draw the 3D planes (ground) void draw_3d_planes(void) { // FLOOR jo_3d_push_matrix(); { jo_3d_rotate_matrix_rad(rot.rx, rot.ry, rot.rz); jo_3d_translate_matrixf(pos.x, pos.y, pos.z); jo_background_3d_plane_a_draw(true); } jo_3d_pop_matrix(); } // Function to initialize the 3D planes void init_3d_planes(void) { jo_img_8bits img; jo_core_tv_off(); jo_enable_background_3d_plane(JO_COLOR_Black); // FLOOR img.data = JO_NULL; jo_tga_8bits_loader(&img, JO_ROOT_DIR, "FLOOR.TGA", 0); jo_background_3d_plane_a_img(&img, image_pal.id, true, true); jo_free_img(&img); jo_core_tv_on(); } void update_camera(void) { // Set the camera position to follow the cube int camera_x = (int)cube.position.x; int camera_y = (int)(cube.position.y + 100); // Adjust for a higher view int camera_z = (int)(cube.position.z - 200); // Position the camera behind the cube // Set the camera's target (where it is looking) int target_x = (int)cube.position.x; int target_y = (int)cube.position.y; int target_z = (int)cube.position.z; // Update the camera's position jo_3d_camera_set_viewpoint(&cam, camera_x, camera_y, camera_z); // Update the camera's target jo_3d_camera_set_target(&cam, target_x, target_y, target_z); } // Main drawing function void my_draw(void) { jo_printf(12, 1, "*Cube Jump Demo*"); /* Update the camera */ jo_3d_camera_look_at(&cam); update_camera(); draw_cube(); jo_printf(0, 28, "Polygon count: %d ", jo_3d_get_polygon_count()); } // Palette handling function jo_palette *my_tga_palette_handling(void) { // Create a new palette for each image. Not ideal but works for a demo. jo_create_palette(&image_pal); return (&image_pal); } // Main function void jo_main(void) { jo_core_init(JO_COLOR_Black); jo_set_tga_palette_handling(my_tga_palette_handling); init_3d_planes(); // Set the initial camera position pos.x = 800.0f; pos.y = 800.0f; pos.z = -35.0f; // Set the initial rotation rot.rx = JO_DEG_TO_RAD(90.0f); rot.ry = JO_DEG_TO_RAD(0.0f); rot.rz = JO_DEG_TO_RAD(45.0f); jo_3d_camera_init(&cam); jo_3d_camera_set_viewpoint(&cam, 0, 0, -250); // Add the cube's sprite jo_sprite_add_tga(JO_ROOT_DIR, "BOX.TGA", JO_COLOR_Transparent); // Create and initialize the cube create_cube(); init_cube(); // Add the callbacks jo_core_add_callback(draw_3d_planes); jo_core_add_callback(my_draw); jo_core_add_callback(update_cube_position); jo_core_run(); }