private void InitializeCollisionMapForAnimationKey(BitPixelFieldComponent bitPixelFieldComponent, int animationKey)
{
var animatedSprite = bitPixelFieldComponent.AnimatedSprite;
var animation = animatedSprite.GetAnimation(animationKey);
var countAnimationFrames = animation.frames.Count;
bitPixelFieldComponent.BitPixelsPerAnimationMap[animationKey] = new List <bool[]>();
bitPixelFieldComponent.TextureWidthPerAnimationMap[animationKey] = new List <int>();
foreach (var animationSubtexture in animation.frames)
{
var animationSpriteTexture = animationSubtexture.texture2D;
var animationTextureBounds = animationSubtexture.sourceRect;
var countPixels = animationTextureBounds.Width * animationTextureBounds.Height;
var colorField = new Color[countPixels];
animationSpriteTexture.GetData(0, animationTextureBounds, colorField, 0, 1);
bitPixelFieldComponent.TextureWidthPerAnimationMap[animationKey].Add(animationSubtexture.sourceRect.Width);
var bitField = new bool[countPixels];
for (int i = 0; i < countPixels; ++i)
{
bitField[i] = (colorField[i].A > 0);
}
bitPixelFieldComponent.BitPixelsPerAnimationMap[animationKey].Add(bitField);
}
}
private bool HasCollisionWith(BitPixelFieldComponent first, BitPixelFieldComponent second)
{
var firstBounds = first.AnimatedSpriteBounds;
var secondBounds = second.AnimatedSpriteBounds;
int left = (int)Math.Max(firstBounds.Left, secondBounds.Left);
int top = (int)Math.Max(firstBounds.Top, secondBounds.Top);
int width = (int)Math.Min(firstBounds.Right, secondBounds.Right) - left;
int height = (int)Math.Min(firstBounds.Bottom, secondBounds.Bottom) - top;
var intersectingRectangle = new Rectangle(left, top, width, height);
for (var x = intersectingRectangle.Left; x < intersectingRectangle.Right; x++)
{
for (var y = intersectingRectangle.Top; y < intersectingRectangle.Bottom; y++)
{
// NOTE: Sometimes one of the pixel fields is null
// TODO: Find out why we have a race condition here
if (first.PixelField == null || second.PixelField == null)
{
return(false);
}
var componentABit = first.PixelField[(x - (int)firstBounds.Left) + (y - (int)firstBounds.Top) * first.TextureWidth];
var componentBBit = second.PixelField[(x - (int)secondBounds.Left) + (y - (int)secondBounds.Top) * second.TextureWidth];
if (componentABit && componentBBit)
{
return(true);
}
}
}
return(false);
}
