From 7363f062baf99097a9a5e2e4366cced0afd526cb Mon Sep 17 00:00:00 2001
From: kartofen <mladenovnasko0@gmail.com>
Date: Fri, 28 Oct 2022 22:23:02 +0300
Subject: wasm support

---
 src/main.c | 55 +++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 41 insertions(+), 14 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 4742ab8..dd37021 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,27 +1,36 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
 #include <math.h>
 #include "display.h"
 
-#define W 1600
-#define H 900
-#define FPS 1000
-#define SCALE 1000
-#define SWING_SCALE 15
+#define W 800
+#define H 600
+
+#ifndef PLATFORM_WEB
+  #define FPS 120
+#else
+  #define FPS 60
+#endif
+
+#define SCALE 800
+#define CYCLES 5
 
 #define RFPS 1/FPS
 #define PI 3.141592654
+#define g -9.81f * SCALE
 
-const float s = (PI/180 * 25); // rad
-const float l = 0.5 * SCALE; // m
-const int m = 7;  // kg
-const float g = -9.81f * SCALE; // m/s^2
+float s = 25;   // starting agnle
+float l = 0.5;  // lenght
+float m = 0.01; // mass in kg
 
 float t;
 float v;
 float a;
 
 float secs = 0.0f;
-int swings = 2 * SWING_SCALE;
+int swings = 2 * CYCLES;
 
 int has_reached_starting_amp(float old_t)
 {
@@ -34,17 +43,22 @@ int has_reached_starting_amp(float old_t)
 
 void update()
 {
+    if(secs == 0.0f) {
+        printf("\nStarting angle: %f", s/(PI/180));
+        printf("\nLenght:         %f", l/SCALE);
+        printf("\nMass:           %f\n", m/SCALE);
+    }
+
     float old_t = t;
     a = (g/l) * sinf(t);
     v += a * RFPS;
     t += v * RFPS;
 
     if(has_reached_starting_amp(old_t)) {
-        puts("new swing");
         swings += 1;
     }
-    if(swings >= 2 * SWING_SCALE) {
-        printf("period: %f\n", secs/SWING_SCALE);
+    if(swings >= 2 * CYCLES) {
+        printf("period: %f\n", secs/CYCLES);
         secs = 0.0f;
         swings = 0;
     }
@@ -57,8 +71,21 @@ void update()
     dspl_draw_circle(px, py, m);
 }
 
-int main(void)
+int main(int argc, char **argv)
 {
+    if(argc != 1 && argc != 4) {
+        puts("Please provide either 0 or 3 arguments:\n\t1st is starting angle in degrees\n\t2nd is lenght in meters\n\t3rd is mass in kilograms");
+        return 1;
+    }
+
+    float arg_s = strtof(argv[1], NULL);
+    float arg_l = strtof(argv[2], NULL);
+    float arg_m = strtof(argv[3], NULL);
+
+    s = ((arg_s == 0.0f) ? s : arg_s) * PI/180;
+    l = ((arg_l == 0.0f) ? l : arg_l) * SCALE;
+    m = ((arg_m == 0.0f) ? m : arg_m) * SCALE;
+
     t = s;
     v = 0;
     a = 0;
-- 
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