private void detectarColisao()
{
foreach (GameObject o in objetos)
{
o.colidiu = false;
}
for (int i = 0; i < objetos.Count; i++)
{
GameObject obj1 = objetos[i];
for (int j = i + 1; j < objetos.Count; j++)
{
GameObject obj2 = objetos[j];
Colisao colisao = verificarColisao(obj1, obj2);
if (colisao.colidiu)
{
obj1.colidiu = true;
obj2.colidiu = true;
Colisao colisao2 = new Colisao();
colisao2.colidiu = colisao.colidiu;
colisao2.local = colisao.local;
preencherSentidoColisao(colisao, obj1);
preencherSentidoColisao(colisao2, obj2);
obj1.colisaoDetectada(obj2, colisao);
obj2.colisaoDetectada(obj1, colisao2);
}
}
if (!obj1.colidiu)
{
obj1.colisaoNaoDetectada();
}
}
}
private Colisao verificarColisao(GameObject a, GameObject b)
{
Color[] bitsA = new Color[a.texture.Width * a.texture.Height];
a.texture.GetData(bitsA);
Color[] bitsB = new Color[b.texture.Width * b.texture.Height];
b.texture.GetData(bitsB);
int x1 = Math.Max(a.rectangle.X, b.rectangle.X);
int x2 = Math.Min(a.rectangle.X + a.rectangle.Width, b.rectangle.X + b.rectangle.Width);
int y1 = Math.Max(a.rectangle.Y, b.rectangle.Y);
int y2 = Math.Min(a.rectangle.Y + a.rectangle.Height, b.rectangle.Y + b.rectangle.Height);
for (int y = y1; y < y2; ++y)
{
for (int x = x1; x < x2; ++x)
{
Color ca = bitsA[(x - a.rectangle.X) + (y - a.rectangle.Y) * a.rectangle.Width];
Color cb = bitsB[(x - b.rectangle.X) + (y - b.rectangle.Y) * b.rectangle.Width];
if (ca.A != 0 && cb.A != 0)
{
Colisao colisao = new Colisao();
colisao.colidiu = true;
colisao.local = new Vector2(x, y);
return(colisao);
}
}
}
return(new Colisao());
}
private void preencherSentidoColisao(Colisao colisao, GameObject obj)
{
Vector2 centro = getCentroGameObject(obj);
if (colisao.local.X > centro.X)
{
colisao.colisaoDireita = true;
}
if (colisao.local.X < centro.X)
{
colisao.colisaoEsquerda = true;
}
if (colisao.local.Y > centro.Y)
{
colisao.colisaoBaixo = true;
}
if (colisao.local.Y < centro.Y)
{
colisao.colisaoCima = true;
}
}
public virtual void colisaoDetectada(GameObject obj, Colisao colisao)
{
}