public CollisionMask(CollisionMaskFunction collisionMaskFunction, BoundingBox bbox)
{
if (collisionMaskFunction == CollisionMaskFunction.Precise)
{
throw new ArgumentOutOfRangeException(nameof(collisionMaskFunction));
}
CollisionMaskFunction = collisionMaskFunction;
switch (collisionMaskFunction)
{
case CollisionMaskFunction.Disk:
_hitTestFunc = HitTestDisk;
break;
case CollisionMaskFunction.Diamond:
_hitTestFunc = HitTestDiamond;
break;
case CollisionMaskFunction.Rectangle:
_hitTestFunc = HitTestRectangle;
break;
}
Left = bbox.Left;
Right = bbox.Right;
Top = bbox.Top;
Bottom = bbox.Bottom;
}
public CollisionMask(IImage[] images, BoundingBox bbox, int alphaTolerance)
{
_hitTestFunc = HitTestPrecise;
CollisionMaskFunction = CollisionMaskFunction.Precise;
Left = bbox.Left;
Top = bbox.Top;
Right = bbox.Right;
Bottom = bbox.Bottom;
var w = Right - Left + 1;
var h = Bottom - Top + 1;
Mask = Enumerable.Range(0, h)
.Select(i => new BitArray(w))
.ToArray();
foreach (var image in images)
{
for (var i = 0; i < w * h; i++)
{
var x = i % w;
var y = i / w;
var ptr = (Top + y) * image.Width + (Left + x);
var alpha = (image.ImageData[ptr] & 0xFF000000) >> 24;
if (alpha > alphaTolerance)
{
Mask[y][x] = true;
}
}
}
}
/// <summary>
/// Creates a sprite with a manual bounding box.
/// </summary>
public GameSprite(GameContext context, int w, int h, int xorigin, int yorigin, IImage[] subImages,
CollisionMaskFunction collisionMaskFunction, BoundingBox boundingBox, bool separateCollisionMasks)
{
Context = context;
Width = w;
Height = h;
XOrigin = xorigin;
YOrigin = yorigin;
SubImages = subImages;
CollisionMaskFunction = collisionMaskFunction;
BoundingBox = boundingBox;
SeparateCollisionMasks = separateCollisionMasks;
BoundingBoxFunction = BoundingBoxFunction.Manual;
CollisionMasks = GenerateCollisionMasks();
}
/// <summary>
/// Creates a sprite with an auto or full-image bounding box.
/// </summary>
public GameSprite(GameContext context, int width, int height, int xorigin, int yorigin, IImage[] subImages,
CollisionMaskFunction collisionMaskFunction, bool autoBoundingBox, int alphaTolerance,
bool separateCollisionMasks)
{
Context = context;
Width = width;
Height = height;
XOrigin = xorigin;
YOrigin = yorigin;
SubImages = subImages;
CollisionMaskFunction = collisionMaskFunction;
SeparateCollisionMasks = separateCollisionMasks;
if (autoBoundingBox)
{
BoundingBox = BoundingBox.Detect(subImages, alphaTolerance);
}
else
{
BoundingBox = new BoundingBox(0, 0, width - 1, height - 1);
}
CollisionMasks = GenerateCollisionMasks();
}
