public static GsVector ComputeProjectileDirection(float angle)
{
GsVector v = new GsVector(1, 0);
GsMatrix rotMatrix = GsMatrix.CreateRotationZ(angle);
return(GsVector.Transform(v, rotMatrix));
}
/// <summary></summary>
public GsPolygon GetHull(GsVector offset)
{
GsVector[] polygon = GetImageHull();
if (hullCache == null || Bounds != previousBounds)
{
GsMatrix transform = CreateTransform(GetTextureDrawData(offset));
hullCache = new GsPolygon(polygon, transform);
previousBounds = Bounds;
}
return(hullCache);
}
/// <summary></summary>
protected virtual GsMatrix CreateTransform(ImageParams data)
{
// create the matrix for transforming the center
GsMatrix transform =
GsMatrix.CreateTranslation(-data.Origin.X, -data.Origin.Y, 0) *
GsMatrix.CreateRotationZ(Orientation) *
GsMatrix.CreateScale(data.Scale.X, data.Scale.Y, 1f) *
GsMatrix.CreateTranslation(data.Position.X, data.Position.Y, 0);
// return the transform
return(transform);
}
/// <summary></summary>
protected virtual GsVector GetCenter(GsVector offset)
{
// get the drawing data
ImageParams data = GetTextureDrawData(offset);
// get the center of the image
GsVector center = data.ImageSize.ToVector() / 2f;
// compute the transform
GsMatrix transform = CreateTransform(data);
// return the center transformated
return(GsVector.Transform(center, transform));
}
