public static bool Collision(CircleCollider self, ParticleCollider other)
{
Vector2 center = new Vector2((float)self.x, (float)self.y);
Vector2 particle = new Vector2((float)other.x, (float)other.y);
return(Vector2.Distance(center, particle) < self.radius);
}
/// <summary>
/// Check for a collision between a LineSegmentCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(LineSegmentCollider self, ParticleCollider other)
{
return(GeometryUtils.IsPointOnSegment(other.x, other.y, self.x1, self.y1, self.x2, self.y2));
}
/// <summary>
/// Check for a collision between a RectCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(RectCollider self, ParticleCollider other)
{
return((self.x <= other.x && other.x <= self.x + self.width) &&
(self.y <= other.y && other.y <= self.y + self.height));
}
/// <summary>
/// Check for a collision between a ParticleCollider and a CircleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, CircleCollider other)
{
return Collision(other, self);
}
/// <summary>
/// Check for a collision between a ParticleCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, ParticleCollider other)
{
return (self.x == other.x && self.y == other.y);
}
/// <summary>
/// Check for a collision between a ParticleCollider and a LineSegmentCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, LineSegmentCollider other)
{
return Collision(other, self);
}
/// <summary>
/// Check for a collision between a RectCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(RectCollider self, ParticleCollider other)
{
return (self.x <= other.x && other.x <= self.x + self.width) &&
(self.y <= other.y && other.y <= self.y + self.height);
}
public static bool Collision(CircleCollider self, ParticleCollider other)
{
Vector2 center = new Vector2((float)self.x, (float)self.y);
Vector2 particle = new Vector2((float)other.x, (float)other.y);
return Vector2.Distance(center, particle) < self.radius;
}
/// <summary>
/// Return the currently selected menu button based on the previous
/// menu parameters.
/// </summary>
/// <param name="current_selected">The index of the currently selected button.</param>
/// <param name="buttons">The array of buttons.</param>
/// <param name="increment">The key that increments the selection.</param>
/// <param name="decrement">The key that decrements the selection.</param>
/// <param name="wrap">
/// Determines what happens when the selection becomes < 0 or greater than the
/// length of the array. If true, then the selection is modded by the length of
/// the array. If false it is clamped.
/// </param>
/// <returns></returns>
public static int? GetMenuSelection(
int? current_selected, SceneButton[] buttons,
Keys increment, Keys decrement,
bool wrap = true, int default_selection = 0)
{
// Local aliases for previous and current mouse and keyboard states.
MouseState pms = Globals.previousMouseState;
MouseState cms = Globals.currentMouseState;
KeyboardState pks = Globals.previousKeyboardState;
KeyboardState cks = Globals.currentKeyboardState;
// If the mouse states are valid, and the positions are different (implying
// the mouse has moved).
if (pms != null && cms.Position != pms.Position)
{
ParticleCollider mouse_pos = new ParticleCollider(cms.Position);
// Find the first button that collides with the mouse.
for (int i = 0; i < buttons.Length; i++)
{
if (CollisionChecker.Collision(buttons[i].CollisionMask, mouse_pos))
return i;
}
}
// Else if the keyboard states are valid.
else if (pks != null)
{
// If the increment key was pressed once.
if (
cks.IsKeyDown(increment) &&
!pks.IsKeyDown(increment))
{
// Return the default value if current_selected == null.
if (!current_selected.HasValue)
return default_selection;
int new_selection = current_selected.Value - 1;
// Clamp or wrap the selection.
if (wrap)
return new_selection % buttons.Length;
return wrap ? new_selection % buttons.Length
: (int)MathHelper.Clamp(new_selection, 0, buttons.Length);
}
// If the decrement key was pressed once.
else if (
cks.IsKeyDown(decrement) &&
!pks.IsKeyDown(decrement))
{
// Return the default value if current_selected == null.
if (!current_selected.HasValue)
return default_selection;
int new_selection = current_selected.Value - 1;
// Clamp or wrap the selection.
if (wrap)
return new_selection % buttons.Length;
return wrap ? new_selection % buttons.Length
: (int)MathHelper.Clamp(new_selection, 0, buttons.Length);
}
}
// Return the current_selected value or null.
return current_selected ?? null;
}
/// <summary>
/// Check for a collision between a ParticleCollider and a CircleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, CircleCollider other)
{
return(Collision(other, self));
}
/// <summary>
/// Check for a collision between a ParticleCollider and a LineSegmentCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, LineSegmentCollider other)
{
return(Collision(other, self));
}
/// <summary>
/// Check for a collision between a ParticleCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(ParticleCollider self, ParticleCollider other)
{
return(self.x == other.x && self.y == other.y);
}
/// <summary>
/// Check for a collision between a RayCollider and a ParticleCollider.
/// </summary>
/// <param name="self"></param>
/// <param name="other"></param>
public static bool Collision(RayCollider self, ParticleCollider other)
{
return GeometryUtils.IsPointOnRay(other.x, other.y, self.x1, self.y1, self.x2, self.y2);
}