#include "allegro.h" typedef struct point3d { float x, y, z; } point3d; typedef struct point2d { float x, y; } point2d; typedef struct cubeline { int a, b; } cubeline; int main(void) { allegro_init(); install_keyboard(); set_color_depth(desktop_color_depth()); if (set_gfx_mode(GFX_AUTODETECT_WINDOWED, 800, 600, 0, 0) != 0) { set_gfx_mode(GFX_TEXT, 0, 0, 0, 0); allegro_message("Couldn't set graphics mode!"); return 1; } set_window_title("Circles3d"); BITMAP* buffer = create_bitmap(800, 600); clear_to_color(buffer, makecol(0, 0, 0)); // Makes the 3d -> 2d mapping thinie give 2d values that are on the screen set_projection_viewport(0, 0, 800, 600); // A CUBE HAS 8 COURNERS. point3d inpoints[8] = { {-16, -16, -16}, {-16, 16.0, -16}, {16.0, 16.0, -16}, {16.0, -16, -16}, {-16, -16, 16.0}, {-16, 16.0, 16.0}, {16.0, 16.0, 16.0}, {16.0, -16, 16.0}}; // A CUBE HAS 12 LINES. cubeline cubelines[12] = { {0, 1}, {1, 2}, {2, 3}, {3, 0}, {4, 5}, {5, 6}, {6, 7}, {7, 4}, {0, 4}, {1, 5}, {2, 6}, {3, 7}}; point2d outpoints[8]; // Translate 3d to 2d for (int i = 0; i < 8; i++) { persp_project_f(inpoints[i].x, inpoints[i].y, inpoints[i].z, &outpoints[i].x, &outpoints[i].y); textprintf_ex(buffer, font, 0, i*10, makecol(255, 255, 255), -1, "persp_project_f(%g, %g, %g, %g, %g);", inpoints[i].x, inpoints[i].y, inpoints[i].z, outpoints[i].x, outpoints[i].y); } // Put lines between all the points on the screen for (int i = 0; i < 12; i++) { line(buffer, outpoints[cubelines[i].a].x, outpoints[cubelines[i].a].y, outpoints[cubelines[i].b].x, outpoints[cubelines[i].b].y, makecol(255, 255, 255)); } blit(buffer, screen, 0, 0, 0, 0, 800, 600); readkey(); } END_OF_MAIN();