initial commit

.gitignore

@@ -0,0 +1,3 @@
+*.core
+agraph
+.git-old

Makefile

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+FILES = main.c
+LINKR = -lm -lncurses
+
+default:
+	gcc -Wall -std=c99 -march=native $(LINKR) $(FILES) -o agraph

main.c

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+#include <stdio.h>
+#include <math.h>
+#include <unistd.h>
+#include <locale.h>
+#include <ncurses.h>
+#include <sys/ioctl.h>
+
+
+double clamp(double num, double min, double max)
+{
+    return (num > max ? max : (num < min ? min : num));
+}
+
+int strln_nt(char *str)
+{
+    int len = 0;
+    while(str[len])
+        len++;
+
+    return len;
+}
+
+int main()
+{
+    // set locale for ncurses
+    setlocale(LC_CTYPE, "");
+
+    // init ncurses
+    initscr();
+    raw();
+    noecho();
+    nodelay(stdscr, TRUE);
+    intrflush(stdscr, FALSE);
+    keypad(stdscr, TRUE);
+
+    // get term size
+    int HEIGHT, WIDTH;
+    getmaxyx(stdscr, HEIGHT, WIDTH);
+    HEIGHT -= 2;
+    WIDTH  -= 2;
+
+    // set animation properties
+    double sinestep  = 5, sinephase  = 0,
+           vsinestep = 1, vsinephase = 0,
+           parastep  = 5, paraphase  = 1;
+
+    // hide cursor
+    curs_set(0);
+
+    // draw border
+    border('|', '|', '-', '-', '+', '+', '+', '+');
+
+    while(1)
+    {
+        whilestart:
+        if(getch() == 'q')
+            goto end;
+
+        sinephase += sinestep;
+        if(sinephase > (20 * M_PI))
+            sinephase = 0;
+
+        vsinephase += vsinestep;
+        if(vsinephase > (8 * M_PI))
+            vsinephase = 0;
+
+        paraphase += parastep;
+        if(paraphase >= 360 || paraphase <= 1)
+            parastep *= -1;
+
+        // init graph
+        char graph[HEIGHT][WIDTH];
+        for(int y = 0; y < HEIGHT; ++y)
+            for(int x = 0; x < WIDTH; ++x)
+                graph[y][x] = ' ';
+
+        // do the math
+        /* sine wave */
+        for(double x = 0; x < WIDTH; ++x)
+            {
+                int y = (int)round(clamp(HEIGHT / 4 * 3 + (sin((x - sinephase) / 10) * 5), 0, HEIGHT));
+                graph[y][(int)x] = 'X';
+            }
+
+        /* cosine wave */
+        for(double x = 0; x < WIDTH; ++x)
+            {
+                int y = (int)round(clamp(HEIGHT / 4 + (cos((x - sinephase) / 10) * 5), 0, HEIGHT));
+                graph[y][(int)x] = 'X';
+            }
+
+        /* vertical sine wave */
+        for(double y = 0; y < HEIGHT; ++y)
+        {
+            int x = (int)round(clamp(WIDTH / 2 + (sin((y - vsinephase) / 4) * 5), 0, WIDTH));
+            graph[(int)y][x] = 'X';
+        }
+
+        /* hyperbola */
+        for(double x = 0; x < WIDTH; ++x)
+        {
+            int y = (int)round(clamp(paraphase/x, 0, HEIGHT));
+            graph[y][(int)x] = 'X';
+        }
+
+        //print the math correctly
+        for(int y = HEIGHT - 1; y >= 0; --y)
+        {
+            while(is_term_resized(HEIGHT + 2, WIDTH + 2))
+            {
+                erase();
+                refresh();
+                usleep(300 * 1000);
+
+                getmaxyx(stdscr, HEIGHT, WIDTH);
+                WIDTH  -= 2;
+                HEIGHT -= 2;
+                border('|', '|', '-', '-', '+', '+', '+', '+');
+
+                if(is_term_resized(HEIGHT + 2, WIDTH + 2))
+                    goto whilestart;
+            }
+
+            for(int x = 0; x < WIDTH; ++x)
+            {
+                mvaddch(HEIGHT - y, x + 1, graph[y][x]);
+            }
+        }
+
+        usleep(1000 / 30 * 1000);
+    }
+
+    // end
+    end:
+    curs_set(1);
+    endwin();
+    putchar(10);
+    return 0;
+}