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public Intersects ( |
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| frectangle | ||
| return | bool | |
/// <summary>
/// Checks if Two Entities are intersecting each other assuming the specified states, gameTime and group filter.
/// This check is actually rather ineffecient. O(n^2) time complexity. In reality though, we would be smart about
/// what to compare - hence the group and state filters. The number of comparasins between drawables should be kept
/// to a minimum in order to maintain performance.
/// </summary>
public static bool IntersectsWith(
Entity entity1, string entity1State, string entity1Group,
Entity entity2, string entity2State, string entity2Group,
GameTime gameTime
)
{
HashSet<GameDrawableInstance> entity1Instances = entity1.Drawables.GetByState(entity1State);
HashSet<GameDrawableInstance> entity2Instances = entity2.Drawables.GetByState(entity2State);
if (entity1Instances == null || entity2Instances == null) return false;
foreach (GameDrawableInstance instanceForEntity1 in entity1Instances)
{
if (entity1Group == null || instanceForEntity1._associatedGroup == entity1Group)
{
Rectangle sourceRectangleEntity1 = instanceForEntity1.GetSourceRectangle(gameTime);
float entity1SourceWidth = sourceRectangleEntity1.Width * entity1.ScaleX;
float entity1SourceHeight = sourceRectangleEntity1.Height * entity1.ScaleY;
FRectangle absBoundingRectEntity1 = new FRectangle(
entity1.Pos.X - entity1SourceWidth * instanceForEntity1.Drawable.Origin.X,
entity1.Pos.Y - entity1SourceHeight * instanceForEntity1.Drawable.Origin.Y,
entity1SourceWidth,
entity1SourceHeight
);
foreach (GameDrawableInstance instanceForEntity2 in entity2Instances)
{
if (entity2Group == null || instanceForEntity2._associatedGroup == entity2Group)
{
Rectangle sourceRectangleEntity2 = instanceForEntity2.GetSourceRectangle(gameTime);
float entity2SourceWidth = sourceRectangleEntity2.Width * entity2.ScaleX;
float entity2SourceHeight = sourceRectangleEntity2.Height * entity2.ScaleY;
FRectangle absBoundingRectEntity2 = new FRectangle(
entity2.Pos.X - entity2SourceWidth * instanceForEntity2.Drawable.Origin.X,
entity2.Pos.Y - entity2SourceHeight * instanceForEntity2.Drawable.Origin.Y,
entity2SourceWidth,
entity2SourceHeight
);
// Check if the two bounding boxes intersect
if (absBoundingRectEntity1.Intersects(absBoundingRectEntity2))
return true;
}
}
}
}
// No Intersection tests passed.
return false;
}
public static bool IntersectsWith(Entity entity, string entityState, string entityGroup, FRectangle bounds, GameTime gameTime)
{
HashSet<DrawableInstance> entityInstances = entity.Drawables.GetByState(entityState);
if (entityInstances == null) return false;
foreach (DrawableInstance instance in entityInstances)
{
if (entityGroup == null || instance._associatedGroup == entityGroup)
{
float entitySourceWidth = instance.GetWidth(gameTime) * entity.ScaleX;
float entitySourceHeight = instance.GetHeight(gameTime) * entity.ScaleY;
FRectangle absBoundingBox = new FRectangle(
entity.Pos.X - entitySourceWidth * instance.Drawable.Origin.X,
entity.Pos.Y - entitySourceHeight * instance.Drawable.Origin.Y,
entitySourceWidth,
entitySourceHeight
);
if (bounds.Intersects(absBoundingBox))
return true;
}
}
// No intersection tests passed.
return false;
}
