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This commit is contained in:
Jason Bou-Samra
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/****************************************************************************
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** 3D_Jason.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 draw (void);
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double x[8], y[8], z[8];
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double xt[8], yt[8], zt[8];
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double xu[8], yu[8], zu[8];
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double angle = 0.0;
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bool quit = false;
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SDL_Window *window = NULL;
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SDL_Renderer *s;
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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 DELAY 3000 /* milliseconds */
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#define TITLE "3Dcube" /* title */
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#define RAD 3.14159265/180
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#define SPEED 3
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int main(void)
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{
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initSDL();
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SDL_RenderSetScale(s, 2.0, 2.0); /* scale x2 */
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while (quit==false){
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while (SDL_PollEvent(&event)) {
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if (event.type==SDL_QUIT || event.type == SDL_WINDOWEVENT_CLOSE) {quit = true;}
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}
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if(quit) {break;}
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rotate();
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draw();
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}
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shutdownSDL();
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}
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/* rotation & projection routine */
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int rotate()
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{
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for (int i=7; i>=0; i--){
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/* x angle (Roll) */
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xt[i]=x[i];
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yt[i]=y[i]*cos(RAD*angle)-z[i]*sin(RAD*angle);
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zt[i]=y[i]*sin(RAD*angle)+z[i]*cos(RAD*angle);
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/* y angle (Pitch) */
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xu[i]=zt[i]*sin(RAD*angle)+xt[i]*cos(RAD*angle);
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yu[i]=yt[i];
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zu[i]=xt[i]*-sin(RAD*angle)+zt[i]*cos(RAD*angle);
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/* z angle (Yaw) */
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xt[i]=xu[i]*cos(RAD*angle)-yu[i]*sin(RAD*angle);
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yt[i]=xu[i]*sin(RAD*angle)+yu[i]*cos(RAD*angle);
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zt[i]=zu[i];
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/* 2d perspective projection */
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xt[i]=(xt[i]*200)/(zt[i]+800)+160;
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yt[i]=(yt[i]*200)/(zt[i]+800)+128;
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}
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angle = angle + SPEED;
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}
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/* render cube */
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int draw()
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{
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SDL_SetRenderDrawColor(s, 0x00, 0x00, 0x00, 255); /* background */
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SDL_RenderClear(s); /* clear screen (black) */
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SDL_SetRenderDrawColor(s, 0x80, 0x00,0x80,255); /* pen */
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SDL_RenderDrawLine(s, xt[0], yt[0], xt[1], yt[1]);
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SDL_RenderDrawLine(s, xt[1], yt[1], xt[2], yt[2]);
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SDL_RenderDrawLine(s, xt[2], yt[2], xt[3], yt[3]);
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SDL_RenderDrawLine(s, xt[3], yt[3], xt[0], yt[0]);
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SDL_RenderDrawLine(s, xt[4], yt[4], xt[5], yt[5]);
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SDL_RenderDrawLine(s, xt[5], yt[5], xt[6], yt[6]);
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SDL_RenderDrawLine(s, xt[6], yt[6], xt[7], yt[7]);
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SDL_RenderDrawLine(s, xt[7], yt[7], xt[4], yt[4]);
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SDL_RenderDrawLine(s, xt[0], yt[0], xt[4], yt[4]);
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SDL_RenderDrawLine(s, xt[1], yt[1], xt[5], yt[5]);
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SDL_RenderDrawLine(s, xt[2], yt[2], xt[6], yt[6]);
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SDL_RenderDrawLine(s, xt[3], yt[3], xt[7], yt[7]);
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SDL_RenderPresent(s);
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}
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/* initialise SDL */
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int initSDL(){
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SDL_Init(SDL_INIT_EVERYTHING);
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/* new window */
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window = SDL_CreateWindow(
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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 errors */
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if (window == NULL) {
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fprintf(stderr, "SDL window failed to initialise: %s\n", SDL_GetError());
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return 1;
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}
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/* create renderer */
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s = 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_Delay(DELAY); /* pause sdl sub-system */
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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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/* cube verticies */
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/* x component */
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double x[]={-80.0, 80.0, 80.0, -80.0, -80.0, 80.0, 80.0, -80.0
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};
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/* y component */
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double y[]={80.0, 80.0, -80.0, -80.0, 80.0, 80.0, -80.0, -80.0
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};
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/* z component */
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double z[]={80.0, 80.0, 80.0, 80.0, -80.0, -80.0, -80.0, -80.0
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};
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/* perspective projection table */
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double ProjPos[]={
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};
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/* message */
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char author[]={"3d vector graphics demo"};
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const char* text = "c version 1";
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