field.h 1.06 KiB
#ifndef _PHYSIQUE_H_
#define _PHYSIQUE_H_
#include "../utils/vec2/vec2.h"
#include "../utils/gfx/gfx.h"
#include "../utils/utils.h"
#include <stdio.h>
// Compute E*qP/norm(qP)
// Return false if norm(qP) < eps
bool compute_e(charge_t c, vec2 p, double eps, vec2 *e);
// Compute the normalized sum of Ei*qiP/norm(qiP)
// Return false if for some qiP, norm(qiP) < eps
bool compute_total_normalized_e(charge_t *charges, int num_charges, vec2 p, double eps, vec2 *e);
// Compute and then draw all the points belonging to a field line,
// starting from pos0.
// Returns false if pos0 is not a valid position
// (for example if pos0 is too close to a charge).
static bool draw_field_line(struct gfx_context_t *ctxt, charge_t *charges, int num_charges, double dx, vec2 pos0, double x0, double x1, double y0, double y1);
// Draw all the charges
// A circle with minus sign for negative charges
// A circle with a plus sign for positive charges
static void draw_charges(struct gfx_context_t *context, charge_t *charges, int num_charges, double x0, double x1, double y0, double y1);
#endif