void Scene::RenderParticle(Particle* particle)
{
Emitter* parent = particle->m_parent;
vec3 norm_dir = parent->GetDirection();
norm_dir = norm_dir.Normalize();
vec3 new_force;
if (!parent->GetDirection().Length())
new_force = vec3(
particle->m_velocity.x * particle->m_speed.x,
particle->m_velocity.y * particle->m_speed.y) * DELTA_TIME;
else
new_force = vec3(
particle->m_speed.x * norm_dir.x + norm_dir.x,
particle->m_speed.y * norm_dir.y + norm_dir.y) * DELTA_TIME;
// Update position by velocity and direction
particle->SetPosition(vec3(
particle->GetPosition().x + new_force.x,
particle->GetPosition().y + new_force.y,
parent->GetPosition().z));
// Set new fade
float new_fade = particle->m_fade * new_force.Length() / parent->GetBoundary();
// Reduce particle's life
particle->m_life -= new_fade;
// Update rotation
particle->SetRotation(particle->GetRotation() + parent->GetSpeed());
// Color effect
// Change color from inside noe to outside one
if (parent->GetEdgeColor().Length())
{
vec3 colorOffset = parent->GetEdgeColor() - parent->GetColor();
particle->SetColor(vec4(
particle->GetColor() + colorOffset * new_fade,
particle->m_life));
}
}
void Scene::RefreshParticle(Particle* particle)
{
Emitter* parent = particle->m_parent;
// If the emitter mode is explosion,
// there is no more refreshing precess
if (parent->GetExplosionToggle())
{
// Reset the original position
if (parent->GetMode() == FIRE)
{
parent->SetDirection(vec3(0.f, 1.f));
float repos_offset = 3.f / 5.f;
float new_pos = parent->GetBoundary() * repos_offset;
particle->SetPosition(parent->GetPosition() +
vec3(
Random::GetInstance().GetRandomFloat(-new_pos, new_pos),
Random::GetInstance().GetRandomFloat(-new_pos, new_pos)));
}
else if (parent->GetMode() == SNOW)
{
particle->SetPosition(parent->GetPosition() +
vec3(
Random::GetInstance().GetRandomFloat(parent->GetSnowStartingPoint().x, parent->GetSnowEndingPoint().x),
Random::GetInstance().GetRandomFloat(parent->GetSnowStartingPoint().y, parent->GetSnowEndingPoint().y)));
}
else
particle->SetPosition(parent->GetPosition());
// Rescale?
if (parent->GetRandomScaleToggle())
{
float randomSize = Random::GetInstance().GetRandomFloat(parent->GetRandomScaleRange().x, parent->GetRandomScaleRange().y);
particle->SetScale(vec3(randomSize, randomSize));
}
// Reset life
particle->m_life = 1.f;
// Reset color
particle->SetColor(vec4(
parent->GetColor().x,
parent->GetColor().y,
parent->GetColor().z,
particle->m_life));
// Set Velocity;
if (!parent->GetDirection().Length())
{
particle->m_velocity = vec3(
Random::GetInstance().GetRandomFloat(-1.f, 1.f),
Random::GetInstance().GetRandomFloat(-1.f, 1.f));
particle->m_velocity = particle->m_velocity.Normalize();
}
// Set speed
particle->m_speed =
parent->GetSpeed() * vec3(
Random::GetInstance().GetRandomFloat(0.f, 1.f),
Random::GetInstance().GetRandomFloat(0.f, 1.f));
// Reset vanishing speed
particle->m_fade = Random::GetInstance().GetRandomFloat(DELTA_TIME, 1.f);
if (parent->GetMode() == EXPLOSION && parent->GetRefreshingToggle())
parent->ActivateExplosion(false);
}
}
