/// <summary>
/// Handles sprite-to-sprite interaction (collision detection, sprite types, etc.).
/// </summary>
/// <param name="character">The character to check against.</param>
public void CheckSpriteColor(Character character)
{
// if the sprite we're checking against is CHARly
if (character.CurrentSpriteType == SpriteType.CHARly)
{
// if this sprite is mad or saved
if (this.CurrentSpriteType == SpriteType.Mad || this.CurrentSpriteType == SpriteType.Saved)
{
// set the sprite type based on the character shape
if (character.CharShapeStatus == this.CharShapeStatus)
{
this.CurrentSpriteType = SpriteType.Saved;
}
else
{
this.CurrentSpriteType = SpriteType.Mad;
}
}
}
}
/// <summary>
/// Check for pixel-perfect collisions
/// </summary>
/// <param name="rectangle0"></param>
/// <param name="rectangle1"></param>
/// <returns></returns>
private bool PixelPerfect(Character charA, Character charB)
{
// Get Color data of each Texture
Color[] bitsA = new Color[charA.Texture.Width * charA.Texture.Height];
charA.Texture.GetData(bitsA);
Color[] bitsB = new Color[charB.Texture.Width * charB.Texture.Height];
charB.Texture.GetData(bitsB);
// Calculate the intersecting rectangle
int x1 = Math.Max(charA.CollisionRectangle.X, charB.CollisionRectangle.X);
int x2 = Math.Min(charA.CollisionRectangle.X + charA.CollisionRectangle.Width, charB.CollisionRectangle.X + charB.CollisionRectangle.Width);
int y1 = Math.Max(charA.CollisionRectangle.Y, charB.CollisionRectangle.Y);
int y2 = Math.Min(charA.CollisionRectangle.Y + charA.CollisionRectangle.Height, charB.CollisionRectangle.Y + charB.CollisionRectangle.Height);
// Calculate image scaling factors
int scaleFactorXA = charA.Texture.Height / charA.CollisionRectangle.Width; // FIXME LATER!!!
int scaleFactorXB = charB.Texture.Height / charB.CollisionRectangle.Width; // FIXME LATER!!!
int scaleFactorYA = charA.Texture.Height / charA.CollisionRectangle.Height;
int scaleFactorYB = charB.Texture.Height / charB.CollisionRectangle.Height;
// For each single pixel in the intersecting rectangle
for (int y = y1; y < y2; ++y)
{
for (int x = x1; x < x2; ++x)
{
// Get the color from each texture
Color a = bitsA[scaleFactorXA * (x - charA.CollisionRectangle.X) + scaleFactorYA * (y - charA.CollisionRectangle.Y) * charA.Texture.Width];
Color b = bitsB[scaleFactorXB * (x - charB.CollisionRectangle.X) + scaleFactorYB * (y - charB.CollisionRectangle.Y) * charB.Texture.Width];
if (a.A != 0 && b.A != 0) // If both colors are not transparent (the alpha channel is not 0), then there is a collision
{
return true;
}
}
}
// If no collision occurred by now, we're clear.
return false;
}
/// <summary>
/// Checks to see if 2 sprites have collided
/// </summary>
public bool CheckForCollisions(Character characterToCheck)
{
// Determine if collision has occurred between 2 sprite rectangles
if (CollisionRectangle.Intersects(characterToCheck.CollisionRectangle))
{
// Check for pixel-perfect collision
if (PixelPerfect(this, characterToCheck))
{
// Check for collision type (between sprites)
if (this.CurrentSpriteType == SpriteType.CHARly ||
characterToCheck.CurrentSpriteType == SpriteType.CHARly)
{
// Check for if the sprite collision involves a "mad" character
if (this.CurrentSpriteType == SpriteType.Mad ||
characterToCheck.CurrentSpriteType == SpriteType.Mad)
{
return true;
}
// Check for if the sprite collision involves a "saved" character
if (this.CurrentSpriteType == SpriteType.Saved)
{
this.IsActive = false;
}
if (characterToCheck.CurrentSpriteType == SpriteType.Saved)
{
characterToCheck.IsActive = false;
}
}
}
}
return false;
}