From d53c5b5481e29cfb39203ab941490b00ab87e54d Mon Sep 17 00:00:00 2001
From: Orestis <orestis.malaspinas@pm.me>
Date: Fri, 5 Mar 2021 22:19:26 +0100
Subject: [PATCH] added logistic map orbit with sdl
---
travaux_pratiques/tpChaos/Makefile | 12 ++++
travaux_pratiques/tpChaos/gfx.c | 95 ++++++++++++++++++++++++++++++
travaux_pratiques/tpChaos/gfx.h | 41 +++++++++++++
travaux_pratiques/tpChaos/map.c | 37 +++++++++---
4 files changed, 178 insertions(+), 7 deletions(-)
create mode 100644 travaux_pratiques/tpChaos/Makefile
create mode 100644 travaux_pratiques/tpChaos/gfx.c
create mode 100644 travaux_pratiques/tpChaos/gfx.h
diff --git a/travaux_pratiques/tpChaos/Makefile b/travaux_pratiques/tpChaos/Makefile
new file mode 100644
index 0000000..e5cf4ae
--- /dev/null
+++ b/travaux_pratiques/tpChaos/Makefile
@@ -0,0 +1,12 @@
+CC=gcc
+CFLAGS=-Wall -Wextra -pedantic -std=c11 -g -fsanitize=leak -fsanitize=undefined -fsanitize=address -O3
+LFLAGS=-lSDL2
+TARGET=map
+
+all: map
+
+map: map.c gfx.c
+ $(CC) $(CFLAGS) $^ -o $@ $(LFLAGS)
+
+clean:
+ rm -f *.o $(TARGET)
diff --git a/travaux_pratiques/tpChaos/gfx.c b/travaux_pratiques/tpChaos/gfx.c
new file mode 100644
index 0000000..aca1933
--- /dev/null
+++ b/travaux_pratiques/tpChaos/gfx.c
@@ -0,0 +1,95 @@
+/// @file gfx.c
+/// @author Florent Gluck
+/// @date November 6, 2016
+/// Helper routines to render pixels in fullscreen graphic mode.
+/// Uses the SDL2 library.
+
+#include "gfx.h"
+
+/// Create a fullscreen graphic window.
+/// @param title Title of the window.
+/// @param width Width of the window in pixels.
+/// @param height Height of the window in pixels.
+/// @return a pointer to the graphic context or NULL if it failed.
+struct gfx_context_t* gfx_create(char *title, uint width, uint height) {
+ if (SDL_Init(SDL_INIT_VIDEO) != 0) goto error;
+ SDL_Window *window = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED,
+ SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_RESIZABLE);
+ SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
+ SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888,
+ SDL_TEXTUREACCESS_STREAMING, width, height);
+ uint32_t *pixels = malloc(width*height*sizeof(uint32_t));
+ struct gfx_context_t *ctxt = malloc(sizeof(struct gfx_context_t));
+
+ if (!window || !renderer || !texture || !pixels || !ctxt) goto error;
+
+ ctxt->renderer = renderer;
+ ctxt->texture = texture;
+ ctxt->window = window;
+ ctxt->width = width;
+ ctxt->height = height;
+ ctxt->pixels = pixels;
+
+ SDL_ShowCursor(SDL_DISABLE);
+ gfx_clear(ctxt, COLOR_BLACK);
+ return ctxt;
+
+error:
+ return NULL;
+}
+
+/// Draw a pixel in the specified graphic context.
+/// @param ctxt Graphic context where the pixel is to be drawn.
+/// @param x X coordinate of the pixel.
+/// @param y Y coordinate of the pixel.
+/// @param color Color of the pixel.
+void gfx_putpixel(struct gfx_context_t *ctxt, int x, int y, uint32_t color) {
+ if (x < ctxt->width && y < ctxt->height)
+ ctxt->pixels[ctxt->width*y+x] = color;
+}
+
+/// Clear the specified graphic context.
+/// @param ctxt Graphic context to clear.
+/// @param color Color to use.
+void gfx_clear(struct gfx_context_t *ctxt, uint32_t color) {
+ int n = ctxt->width*ctxt->height;
+ while (n)
+ ctxt->pixels[--n] = color;
+}
+
+/// Display the graphic context.
+/// @param ctxt Graphic context to clear.
+void gfx_present(struct gfx_context_t *ctxt) {
+ SDL_UpdateTexture(ctxt->texture, NULL, ctxt->pixels, ctxt->width*sizeof(uint32_t));
+ SDL_RenderCopy(ctxt->renderer, ctxt->texture, NULL, NULL);
+ SDL_RenderPresent(ctxt->renderer);
+}
+
+/// Destroy a graphic window.
+/// @param ctxt Graphic context of the window to close.
+void gfx_destroy(struct gfx_context_t *ctxt) {
+ SDL_ShowCursor(SDL_ENABLE);
+ SDL_DestroyTexture(ctxt->texture);
+ SDL_DestroyRenderer(ctxt->renderer);
+ SDL_DestroyWindow(ctxt->window);
+ free(ctxt->pixels);
+ ctxt->texture = NULL;
+ ctxt->renderer = NULL;
+ ctxt->window = NULL;
+ ctxt->pixels = NULL;
+ SDL_Quit();
+ free(ctxt);
+}
+
+/// If a key was pressed, returns its key code (non blocking call).
+/// List of key codes: https://wiki.libsdl.org/SDL_Keycode
+/// @return the key that was pressed or 0 if none was pressed.
+SDL_Keycode gfx_keypressed() {
+ SDL_Event event;
+ if (SDL_PollEvent(&event)) {
+ if (event.type == SDL_KEYDOWN)
+ return event.key.keysym.sym;
+ }
+ return 0;
+}
+
diff --git a/travaux_pratiques/tpChaos/gfx.h b/travaux_pratiques/tpChaos/gfx.h
new file mode 100644
index 0000000..72bbdc3
--- /dev/null
+++ b/travaux_pratiques/tpChaos/gfx.h
@@ -0,0 +1,41 @@
+#ifndef _GFX_H_
+#define _GFX_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <SDL2/SDL.h>
+
+#define MAKE_COLOR(r,g,b) ((uint32_t)b|((uint32_t)g<<8)|((uint32_t)r<<16))
+
+#define COLOR_GET_B(color) (color & 0xff)
+#define COLOR_GET_G(color) ((color >> 8) & 0xff)
+#define COLOR_GET_R(color) ((color >> 16) & 0xff)
+
+#define COLOR_BLACK 0x00000000
+#define COLOR_RED 0x00FF0000
+#define COLOR_GREEN 0x0000FF00
+#define COLOR_BLUE 0x000000FF
+#define COLOR_WHITE 0x00FFFFFF
+#define COLOR_YELLOW 0x00FFFF00
+
+typedef unsigned int uint;
+typedef unsigned long ulong;
+typedef unsigned char uchar;
+
+struct gfx_context_t {
+ SDL_Window *window;
+ SDL_Renderer *renderer;
+ SDL_Texture *texture;
+ uint32_t *pixels;
+ int width;
+ int height;
+};
+
+extern void gfx_putpixel(struct gfx_context_t *ctxt, int x, int y, uint32_t color);
+extern void gfx_clear(struct gfx_context_t *ctxt, uint32_t color);
+extern struct gfx_context_t* gfx_create(char *text, uint width, uint height);
+extern void gfx_destroy(struct gfx_context_t *ctxt);
+extern void gfx_present(struct gfx_context_t *ctxt);
+extern SDL_Keycode gfx_keypressed();
+
+#endif
diff --git a/travaux_pratiques/tpChaos/map.c b/travaux_pratiques/tpChaos/map.c
index 5750975..bbfe075 100644
--- a/travaux_pratiques/tpChaos/map.c
+++ b/travaux_pratiques/tpChaos/map.c
@@ -1,23 +1,46 @@
#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "gfx.h"
double map(double x, double lambda) {
return lambda * x * (1.0 - x);
}
int main() {
- const double lambda_min = 0.0;
- const double lambda_max = 4.0;
- const int N = 100;
+ const double lambda_min = 0;
+ const double lambda_max = 4;
+ const int N = 1920;
+ const int M = 960;
const double dl = (lambda_max - lambda_min) / N;
+
+ struct gfx_context_t *ctxt = gfx_create("Example", N, M);
+ if (!ctxt) {
+ fprintf(stderr, "Graphics initialization failed!\n");
+ return EXIT_FAILURE;
+ }
+ gfx_clear(ctxt, COLOR_BLACK);
- int max_iter = 1000;
- for (double lambda = 0.0; lambda < lambda_max; lambda += dl) {
+ int max_iter = 100000;
+ for (double i_lambda = 0; i_lambda < N; ++i_lambda) {
double x = 0.5;
for (int i = 0; i < max_iter; ++i) {
- printf("x(%d, %g) = %g\n", i, lambda, x);
+ double lambda = lambda_min + i_lambda * dl;
x = map(x, lambda);
+ if (i > max_iter - M) {
+ gfx_putpixel(ctxt, i_lambda, x * M, COLOR_WHITE);
+ // printf("x(%d, %g) = %g\n", i, i_lambda * dl, x);
+
+ // usleep((unsigned int)1000);
+ }
}
- printf("\n");
+ gfx_present(ctxt);
+
+ // printf("\n");
}
+ while (gfx_keypressed() != SDLK_ESCAPE) {
+ }
+ gfx_destroy(ctxt);
+ return EXIT_SUCCESS;
}
--
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