94 lines
2.5 KiB
C
Executable File
94 lines
2.5 KiB
C
Executable File
#include <stdio.h>
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#include <math.h>
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#include <inttypes.h>
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#include <SDL2/SDL.h>
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#ifdef SKIP
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clang -g -Wall -Wextra -Wpedantic --std=gnu99 -O3 \
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`pkg-config --cflags sdl2` \
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-o phyllotaxis phyllotaxis.c \
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`pkg-config --libs sdl2` -lm
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exit 0
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#endif
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void star(SDL_Renderer *r, uint16_t x, uint16_t y ){
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SDL_RenderDrawPoint(r, x, y);
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SDL_RenderDrawPoint(r, x, y+1);
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SDL_RenderDrawPoint(r, x, y-1);
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SDL_RenderDrawPoint(r, x-1, y);
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SDL_RenderDrawPoint(r, x+1, y);
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}
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int main(){
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/* defs */
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SDL_Init(SDL_INIT_EVERYTHING);
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char * appname = "phyllotaxis";
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SDL_Window *w;
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SDL_Renderer *r;
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SDL_Texture *t;
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SDL_Event e;
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uint16_t c, n, x, y;
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float rad, a;
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uint16_t ww = 1366;
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uint16_t wh = 768;
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n = 0;
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c = 4;
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/* inits */
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w = SDL_CreateWindow(appname, SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED, ww, wh, 0x0);
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r = SDL_CreateRenderer(w, -1,
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SDL_RENDERER_ACCELERATED |
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SDL_RENDERER_TARGETTEXTURE |
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SDL_RENDERER_PRESENTVSYNC);
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t = SDL_CreateTexture(r, SDL_PIXELFORMAT_RGBA4444,
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SDL_TEXTUREACCESS_TARGET, ww, wh);
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/* Set canvas to be the texture t */
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SDL_SetRenderTarget(r, t);
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/* clear it */
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SDL_SetRenderDrawColor(r, 0x00, 0x00, 0x00, 0xF0);
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SDL_RenderClear(r);
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do{
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SDL_PollEvent(&e);
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/* CTRL+Q quits */
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if((e.key.keysym.sym == SDLK_q) &
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(SDL_GetModState() == KMOD_LCTRL)) break;
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n++;
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/* Set actual canvas to be the renderer r */
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SDL_SetRenderTarget(r, 0x00);
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/* clear it */
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SDL_SetRenderDrawColor(r, 0x00, 0x00, 0x00, 0xF0);
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SDL_RenderClear(r);
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/* Set the actual canvas to be the texture t */
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SDL_SetRenderTarget(r, t);
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/* draw stuff */
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a = (180/M_PI) * n * 137.3;
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rad = c * sqrt(n);
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x = (uint16_t) rad * cosf(a) + ww/2;
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y = (uint16_t) rad * sinf(a) + wh/2;
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SDL_SetRenderDrawColor(r, (int)n%256, (int)a%256, (int)rad%256, 0xF0);
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if( (0 < x < ww) & (0 < y < wh) )
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star(r, (int) x, (int) y);
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/* actual canvas is r */
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SDL_SetRenderTarget(r, 0x00);
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/* copy t to actual canvas (r) */
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SDL_RenderCopy(r, t, 0x00, 0x00);
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/* present canvas r */
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SDL_RenderPresent(r);
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/*SDL_Delay(5);*/
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} while(1);
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/* exit */
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SDL_DestroyRenderer(r);
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SDL_DestroyTexture(t);
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SDL_DestroyWindow(w);
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SDL_Quit();
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return(0);
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}
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