public GraphicsObject(GameObject host)
{
Host = host;
}
/// <summary>
/// Checks for a collision between this object and another.
/// </summary>
/// <param name="other"></param>
/// <returns>Collision detected</returns>
public bool CheckCollide(GameObject other)
{
if ((other.Position - Position).LengthSquared() > other.Sprite.RadiusSquared + Sprite.RadiusSquared) {
return false;
}
GameObject small, large;
if (Sprite.Dimensions.Width * Sprite.Dimensions.Height < other.Sprite.Dimensions.Width * other.Sprite.Dimensions.Height) {
small = this;
large = other;
} else {
large = this;
small = other;
}
// Matrix to convert from small-space to large-space, the local space of the respective objects.
Matrix s2l = small.Transform * Matrix.Invert(large.Transform);
Color[] sColors = new Color[small.Sprite.Dimensions.Width * small.Sprite.Dimensions.Height];
Color[] lColors = new Color[large.Sprite.Dimensions.Width * large.Sprite.Dimensions.Height];
small.Sprite.GetColorData(ref sColors);
large.Sprite.GetColorData(ref lColors);
Vector3 sPos = new Vector3(0, 0, 1);
Vector3 lPos;
int sIndex = 0;
int lIndex;
for (sPos.Y = 0; sPos.Y < small.Sprite.Dimensions.Height; ++sPos.Y)
for (sPos.X = 0; sPos.X < small.Sprite.Dimensions.Width; ++sPos.X, ++sIndex) {
if (sColors[sIndex].A > 0) {
Vector3.Transform(ref sPos, ref s2l, out lPos);
lIndex = large.Sprite.Sheet.VectorToIndex(lPos);
if (lIndex >= 0 && lColors[lIndex].A > 0)
return true;
}
}
return false;
}
