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Scale factor and expansion upon basic implementation

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This commit is contained in:
octolinkyt
2026-06-15 11:54:39 -04:00
committed by P7MJ
parent c4930f77df
commit 4b545205aa
19 changed files with 2400 additions and 41 deletions
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115
src/physics.c Normal file
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#include <math.h>
#include "physics.h"
#include "world.h"
#include "config.h"
void UpdateEntities(float dt, int screenWidth)
{
for (int i = 0; i < MAX_ENTITIES; i++)
{
Entity *e = &entities[i];
if (!e->active)
continue;
bool onGround = IsGrounded(e);
if (e->affectedByGravity)
{
ApplyForce(
e,
(Vector2){0, e->mass * g}
);
}
e->acceleration.x =
e->force.x / e->mass;
e->acceleration.y =
e->force.y / e->mass;
e->velocity.x +=
e->acceleration.x * dt;
e->velocity.y +=
e->acceleration.y * dt;
e->velocity.x *= AIR_DRAG;
e->velocity.y *= AIR_DRAG;
if (onGround)
{
if (e->velocity.x > 0)
{
e->velocity.x -=
GROUND_FRICTION * dt;
if (e->velocity.x < 0)
e->velocity.x = 0;
}
else if (e->velocity.x < 0)
{
e->velocity.x +=
GROUND_FRICTION * dt;
if (e->velocity.x > 0)
e->velocity.x = 0;
}
}
if (e->isPlayer)
{
if (e->velocity.x > MAX_PLAYER_SPEED)
e->velocity.x = MAX_PLAYER_SPEED;
if (e->velocity.x < -MAX_PLAYER_SPEED)
e->velocity.x = -MAX_PLAYER_SPEED;
}
e->position.x +=
e->velocity.x * dt;
e->position.y +=
e->velocity.y * dt;
e->force = (Vector2){0, 0};
if (e->position.y +
e->size * 0.5f >=
ground_y)
{
e->position.y =
ground_y -
e->size * 0.5f;
e->velocity.y *=
-BOUNCE;
if (fabsf(e->velocity.y) < 15.0f)
{
e->velocity.y = 0;
}
}
if (e->position.x -
e->size * 0.5f < 0)
{
e->position.x =
e->size * 0.5f;
e->velocity.x *= -0.6f;
}
if (e->position.x +
e->size * 0.5f >
screenWidth)
{
e->position.x =
screenWidth -
e->size * 0.5f;
e->velocity.x *= -0.6f;
}
}
}