bulk data dump
This commit is contained in:
Jason Bou-Samra
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/****************************************************************************
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** 3Dcube_final.c - display a 3D rotating cube **
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** Copyright (c) 31/12/2022 Jason Bou-Samra [Paragon] **
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** **
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** This program is free software: you can redistribute it and/or modify **
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** it under the terms of the GNU General Public License as published by **
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** the Free Software Foundation, either version 3 of the License, or **
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** (at your option) any later version. **
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** **
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** This program is distributed in the hope that it will be useful, **
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** but WITHOUT ANY WARRANTY; without even the implied warranty of **
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
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** GNU General Public License for more details. **
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** **
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** You should have received a copy of the GNU General Public License **
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** along with this program. If not, see <https://www.gnu.org/licenses/>. **
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****************************************************************************/
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#include <stdio.h>
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#include <SDL2/SDL.h>
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#include <math.h>
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#include <stdbool.h>
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int initSDL (void);
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int shutdownSDL (void);
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int rotate (void);
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int render (void);
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double rx, l, fs, c, s;
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double x[8], y[8], z[8]; /* xyz coords */
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double xt, yt, zt; /* temp xyz coords */
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double vx[8], vy[8]; /* vertices */
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bool quit = false; /* quit flag */
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SDL_Window *window = NULL;
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SDL_Renderer *sr;
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SDL_Event event;
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/* window paramaters */
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#define WIDTH 640 /* pixels */
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#define HEIGHT 512 /* pixels */
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#define TITLE "3Dcube" /* window title */
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#define STEPS .05 /* resolution */
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int main (void)
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{
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initSDL ();
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SDL_RenderSetScale (sr, 2.0, 2.0); /* scale x2 */
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rx = -0.1;
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l = 80;
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fs = 200; /* scale factor */
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l = l / 2;
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while (quit == false)
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{
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while (SDL_PollEvent (&event))
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{
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if (event.type == SDL_QUIT || event.type == SDL_WINDOWEVENT_CLOSE)
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{
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quit = true;
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}
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}
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if (quit)
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{
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break;
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}
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/* define cube */
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x[0] = -l; y[0] = -l; z[0] = -l;
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x[1] = -l; y[1] = l; z[1] = -l;
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x[2] = l; y[2] = l; z[2] = -l;
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x[3] = l; y[3] = -l; z[3] = -l;
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x[4] = -l; y[4] = -l; z[4] = l;
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x[5] = -l; y[5] = l; z[5] = l;
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x[6] = l; y[6] = l; z[6] = l;
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x[7] = l; y[7] = -l; z[7] = l;
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rx = rx + STEPS;
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c = cos (rx);
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s = sin (rx);
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rotate ();
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render ();
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// SDL_Delay(50);
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}
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shutdownSDL (); /* bye */
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}
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/* render */
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int render ()
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{
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/* foreground & background colours */
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SDL_SetRenderDrawColor (sr, 0x00, 0x10, 0x00, 255); /* background */
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SDL_RenderClear (sr); /* clear background */
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SDL_SetRenderDrawColor (sr, 0x00, 0xF0, 0x00, 255); /* set pen colour*/
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/* draw cube */
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SDL_RenderDrawLine (sr, vx[0], vy[0], vx[1], vy[1]);
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SDL_RenderDrawLine (sr, vx[1], vy[1], vx[2], vy[2]);
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SDL_RenderDrawLine (sr, vx[2], vy[2], vx[3], vy[3]);
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SDL_RenderDrawLine (sr, vx[3], vy[3], vx[0], vy[0]);
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SDL_RenderDrawLine (sr, vx[4], vy[4], vx[5], vy[5]);
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SDL_RenderDrawLine (sr, vx[5], vy[5], vx[6], vy[6]);
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SDL_RenderDrawLine (sr, vx[6], vy[6], vx[7], vy[7]);
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SDL_RenderDrawLine (sr, vx[7], vy[7], vx[4], vy[4]);
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SDL_RenderDrawLine (sr, vx[0], vy[0], vx[4], vy[4]);
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SDL_RenderDrawLine (sr, vx[3], vy[3], vx[7], vy[7]);
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SDL_RenderDrawLine (sr, vx[1], vy[1], vx[5], vy[5]);
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SDL_RenderDrawLine (sr, vx[2], vy[2], vx[6], vy[6]);
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SDL_RenderPresent (sr);
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}
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/* rotation routine */
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int rotate ()
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{
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for (int np = 0; np < 8; np++)
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{
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/* rotation around x axis */
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yt = y[np];
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y[np] = c * yt - s * z[np];
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z[np] = s * yt + c * z[np];
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/* rotation around y axis */
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xt = x[np];
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x[np] = c * xt + s * z[np];
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z[np] = -s * xt + c * z[np];
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/* rotation around z axis */
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xt = x[np];
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x[np] = c * xt - s * y[np];
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y[np] = s * xt + c * y[np];
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/* now project into 2D */
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vx[np] = (x[np] * fs) / (z[np] + fs) + 160;
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vy[np] = (y[np] * fs) / (z[np] + fs) + 128;
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}
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}
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/* initialise SDL */
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int initSDL ()
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{
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SDL_Init (SDL_INIT_EVERYTHING);
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/* new window */
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window = SDL_CreateWindow (TITLE, /* title */
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SDL_WINDOWPOS_UNDEFINED, /* x pos */
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SDL_WINDOWPOS_UNDEFINED, /* w pos */
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WIDTH, /* width */
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HEIGHT, /* height */
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0); /* Additional flag(s) */
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/* deal with error */
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if (window == NULL)
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{
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fprintf (stderr, "SDL window failed to initialise: %s\n",
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SDL_GetError ());
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return 1;
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}
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/* creater renderer */
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sr = SDL_CreateRenderer (window, 0, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
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}
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/* shutdown routine */
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int shutdownSDL ()
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{
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SDL_DestroyWindow (window); /* free memory */
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SDL_Quit (); /* shutdown entire sdl sub-systems */
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return 0;
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}
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/* message */
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char author[] = { "3d vector graphics demo by jason bou-samra" };
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const char* text = "Amiga by Commodore all the way";
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