Depedency of draw

utils.c

+#include <math.h>
+#include <stdlib.h>
+#include "vector/vector.h"
+#include "utils.h"
+
+coordinates_t coordinates_create(int row_, int column_)
+{
+    coordinates_t c = {.row = row_, .column = column_};
+    return c;
+}
+
+// Transform a position in the univers [x0,y0]x[x1,y1] to a screen position
+coordinates_t position_to_coordinates(int width, int height, double x0, double x1, double y0, double y1, vector pos)
+{
+    double dx = x1 - x0;
+    double dy = y1 - y0;
+    return coordinates_create((int)round(height * (pos.y - y0) / dy), (int)round(width * (pos.x - x0) / dx));
+}
+
+double rand_one()
+{
+    return (double)rand() / (double)RAND_MAX;
+}
+
+charge_t charge_create(double q, vector pos)
+{
+    charge_t c = {.q = q, .pos = pos};
+    return c;
+}
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utils.h

+#ifndef _UTILS_H_
+#define _UTILS_H_
+
+#define K 8.988e9;
+#define E 1.602e-19;
+
+#include <stdint.h>
+#include "vector/vector.h"
+
+typedef struct
+{
+    uint32_t row;
+    uint32_t column;
+} coordinates_t;
+
+typedef struct
+{
+    double q;
+    vector pos;
+} charge_t;
+
+coordinates_t coordinates_create(int row_, int column_);
+
+// Transform a position in the univers [x0,y0]x[x1,y1] to a screen position
+coordinates_t position_to_coordinates(int width, int height, double x0, double x1, double y0, double y1, vector pos);
+
+double rand_one();
+
+charge_t charge_create(double q, vector pos);
+
+#endif
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