private void CheckForCollisions()
{
contactX = true;
contactYbottom = true;
contactYtop = true;
contactLeft = true;
contactRight = true;
contactFoliage = false;
isInClimbingArea = false;
insideClimbingArea = null;
IsInAir = true;
bool ray1Intersect = false, ray2Intersect = false;
bool rayLeftIntersect = false, rayRightIntersect = false;
TrapPlacementPossible = false;
//Multiple iterations are used for collision detection, since one correction could cause another collision
Collidable trapPlacementRay = new Ray(new Vector2(TrapPlacementPos.X, TrapPlacementPos.Y - 50), new Vector2(TrapPlacementPos.X, TrapPlacementPos.Y + 50));
for (var iteration = 0;
iteration < collisionTestIterations && (contactX || contactYbottom || contactYtop);
iteration++)
{
// Calculate the amount of X and Y movement expected by the player this frame
var nextMove = speed * delta;
// Store the original final expected movement of the player so we can
// see if it has been modified due to a collision or potential collision later
var originalMove = nextMove;
// No collisions found yet
contactX = contactYbottom = contactYtop = contactLeft = contactRight = false;
insideClimbingArea = new CollidableResults()
{
IntersectLeft = false,
IntersectRight = false,
IntersectUp = false,
IntersectDown = false,
};
rayCastResult = new CollidableResults()
{
Intersect = false
};
trapPlacementCastResult = new CollidableResults()
{
Intersect = false
};
//check for potential collisions with polygons
float tempX, tempY, tempWidth, tempHeight;
tempX = (float)Math.Round(position.X + hitboxOffset.X - 1, MidpointRounding.AwayFromZero);
tempY = (float)Math.Round(position.Y + hitboxOffset.Y - 1, MidpointRounding.AwayFromZero);
tempWidth = (float)Math.Round(tempX + BoundingBox.Width + 1, MidpointRounding.AwayFromZero);
tempHeight = (float)Math.Round(tempY + BoundingBox.Height + 1, MidpointRounding.AwayFromZero);
//Calculate the bounding polygon of the player at the current position
var playerNextBounds = new Polygon(new List <Vector2>
{
new Vector2(tempX, tempY),
new Vector2(tempWidth, tempY),
new Vector2(tempWidth, tempHeight),
new Vector2(tempX, tempHeight)
}, false, false);
var rayHeight = (tempHeight + tempY) / 2f;
Collidable ray1 = new Ray(new Vector2(tempX, tempHeight - 10),
new Vector2(tempX, tempHeight + 10));
Collidable ray2 = new Ray(new Vector2(tempWidth, tempHeight - 10),
new Vector2(tempWidth, tempHeight + 10));
Collidable rayLeft = new Ray(new Vector2(tempX + 10, rayHeight),
new Vector2(tempX - 10, rayHeight));
Collidable rayRight = new Ray(new Vector2(tempWidth - 10, rayHeight),
new Vector2(tempWidth + 10, rayHeight));
climableYCenter = -1f;
for (var i = 0; i < scene.GetCollidables().Count; i++)
{
var currentCollidable = scene.GetCollidables()[i];
if (!currentCollidable.IsClimbable)
{
//----------------- Ray - Slope detection ---------------------------//
//The following code section shoots rays from the bottom of the player's bounding box to the ground.
//The results of the rays are used to check, whether the player is standing on a slope. If yes, the ..
//.. movement of the players is adjusted according to the steepness of the slope.
//!contactX && !contactYbottom && !contactYtop
if (!rayCastResult.Intersect)
{
rayCastResult = RayCast.DetectSlope(ray1, ray2, currentCollidable);
}
if (!ray1Intersect)
{
ray1Intersect = RayCast.CheckIfInsideClimbingArea(ray1, currentCollidable);
}
if (!ray2Intersect)
{
ray2Intersect = RayCast.CheckIfInsideClimbingArea(ray2, currentCollidable);
}
if (ray1Intersect || ray2Intersect)
{
IsInAir = false;
}
//Check if player collides left or right using rays
if (!rayLeftIntersect)
{
rayLeftIntersect = RayCast.CheckIfInsideClimbingArea(rayLeft, currentCollidable);
}
if (!rayRightIntersect)
{
rayRightIntersect = RayCast.CheckIfInsideClimbingArea(rayRight, currentCollidable);
}
//----------------- Ray - Slope detection -END---------------------------//
}
//------------------- Trap Placement Check -------------------------------//
if (!trapPlacementCastResult.Intersect)
{
trapPlacementCastResult.Intersect = RayCast.CheckIfInsideClimbingArea(trapPlacementRay, currentCollidable);
}
//------------------- Trap Placement Check - END -------------------------------//
var polygonCollisionResult = currentCollidable.CheckForCollision(playerNextBounds,
speed * delta);
//Only adjust speed of the player if the polygon can't be climbed up or down( => IsClimbable)
if (polygonCollisionResult.WillIntersect && !currentCollidable.IsClimbable)
{
nextMove = polygonCollisionResult.MinimumTranslationVector + speed * delta;
}
else if ((polygonCollisionResult.WillIntersect || polygonCollisionResult.Intersect) &&
currentCollidable.IsClimbable)
{
isInClimbingArea = true;
bool atTop = false;
//--------- Ray- Climbing area detection ----------- //
//The following code section shoots ray left and right out of the players bounding box, in order
//to verify, whether the player is still inside the bounds of the climbing area and limit his movement otherwise
if (IsClimbing)
{
//check if player is still inside the climbable area
rayHeight = (tempHeight + tempY) / 2f;
var rayWidth = (tempWidth + tempX) / 2f;
var deltaHeight = (tempHeight - tempY) / 2f;
float collidableXMin = currentCollidable.MinWidth;
float collidableXMax = currentCollidable.MaxWidth;
float collidableYMax = currentCollidable.MaxHeight;
float collidableYMin = currentCollidable.ClimbGroupMinY;
if (rayHeight - currentCollidable.CenterYClimbGroup < 0)
{
atTop = true;
}
if (tempX >= collidableXMin)
{
Collidable leftRay = new Ray(new Vector2(collidableXMin - 10, rayHeight),
new Vector2(tempX + 10, rayHeight));
if (RayCast.CheckIfInsideClimbingArea(leftRay, currentCollidable))
{
insideClimbingArea.IntersectLeft = true;
}
}
if (tempWidth <= collidableXMax)
{
Collidable rightRay = new Ray(new Vector2(tempWidth - 10, rayHeight),
new Vector2(collidableXMax + 10, rayHeight));
if (RayCast.CheckIfInsideClimbingArea(rightRay, currentCollidable))
{
insideClimbingArea.IntersectRight = true;
}
}
if (tempHeight <= collidableYMax)
{
Collidable downRayLeft = new Ray(new Vector2(tempX, tempHeight + 20),
new Vector2(tempX, collidableYMax + 30));
Collidable downRayRight = new Ray(new Vector2(tempWidth, tempHeight + 20),
new Vector2(tempWidth, collidableYMax + 30));
Collidable downRayMiddle = new Ray(new Vector2(rayWidth, tempHeight - 2),
new Vector2(rayWidth, collidableYMax + 10));
if (atTop)
{
if (RayCast.CheckIfInsideClimbingArea(downRayMiddle, currentCollidable))
{
insideClimbingArea.IntersectDown = true;
}
}
else
{
if (RayCast.CheckIfInsideClimbingArea(downRayLeft, currentCollidable) && RayCast.CheckIfInsideClimbingArea(downRayRight, currentCollidable))
{
insideClimbingArea.IntersectDown = true;
}
}
}
if (atTop)
{
insideClimbingArea.IntersectUp = !(tempY + deltaHeight < collidableYMin);
}
else
{
insideClimbingArea.IntersectUp = true;
}
climbableYMax = currentCollidable.ClimbGroupMaxY;
climableYCenter = currentCollidable.CenterYClimbGroup;
}
//--------- Ray- Climbing area detection -END----------- //
}
// Detect what type of contact has occurred based on a comparison of
// the original expected movement vector and the new one
if (nextMove.Y > originalMove.Y)
{
contactYtop = true;
}
if (nextMove.Y < originalMove.Y)
{
contactYbottom = true;
}
if (nextMove.X < originalMove.X)
{
contactRight = true;
}
if (nextMove.X > originalMove.X)
{
contactLeft = true;
}
contactX = contactLeft || contactRight;
if (contactX && contactYtop && speed.Y < 0)
{
speed.Y = nextMove.Y = 0;
}
if (contactX && contactYbottom && speed.Y > 0)
{
speed.Y = nextMove.Y = 0;
}
}
if (!isInClimbingArea)
{
IsClimbing = false;
}
if (IsClimbing)
{
nextMove = originalMove;
var anyContact = contactYbottom || contactYtop || contactX;
if (anyContact && Math.Abs(originalMove.X) > 0.001)
{
if (!insideClimbingArea.IntersectLeft && originalMove.X < 0 && contactLeft)
{
nextMove.X = 0;
speed.X = 0;
}
if (!insideClimbingArea.IntersectRight && originalMove.X > 0 && contactRight)
{
nextMove.X = 0;
speed.X = 0;
}
}
if (anyContact && originalMove.Y > 0.001)
{
if ((insideClimbingArea.IntersectLeft || insideClimbingArea.IntersectRight) &&
!insideClimbingArea.IntersectDown)
{
nextMove.Y = 0;
speed.Y = 0;
IsClimbing = false;
}
}
if (originalMove.Y < 0f && !insideClimbingArea.IntersectUp)
{
nextMove.Y -= CharacterConfig.JUMP_START_SPEED_Y / 10f;
IsClimbing = false;
}
}
// If a contact has been detected, apply the re-calculated movement vector
// and disable any further movement this frame (in either X or Y as appropriate)
if (contactYtop || contactYbottom)
{
position.Y += nextMove.Y;
speed.Y = 0;
if (contactYbottom)
{
jumping = false;
IsInAir = false;
}
}
if (contactX)
{
if (rayCastResult.Intersect && !contactYtop && !(rayLeftIntersect && originalMove.X < 0) && !(rayRightIntersect && originalMove.X > 0))
{
position.X += nextMove.X * 0.5f * Math.Abs(rayCastResult.CollisionNormal.X);
if (Math.Abs(nextMove.X) > 0.0001f)
{
float newSpeed = speed.X * (1 - 0.3f * Math.Abs(rayCastResult.CollisionNormal.X));
speed.X = 0.6f * speed.X + 0.4f * newSpeed;
}
else
{
speed.X = 0;
}
}
else
{
if (!(rayLeftIntersect && nextMove.X < 0) && !(rayRightIntersect && nextMove.X > 0))
{
position.X += nextMove.X;
}
speed.X = 0;
}
}
else if (insideClimbingArea != null)
{
position.X += nextMove.X;
}
if (jumping && IsClimbing)
{
jumping = false;
speed.X = 0;
}
if (((contactX || contactYtop) && (IsInAir) && !IsClimbing))
{
speed.X = nextMove.X = 0;
speed.Y += 3 * accY * delta;
nextMove.Y = speed.Y * delta;
}
if (IsInAir && !jumping)
{
speed.X *= 0.9f;
}
if (trapPlacementCastResult.Intersect && !(rayLeftIntersect && !IsFacingRight()) && !(rayRightIntersect && IsFacingRight()))
{
TrapPlacementPossible = true;
}
}
//Check if the player intersects any of the other actors (like undergrowth, treasure, base etc.)
IsTouchingShopkeeper = false;
contactFoliage = false;
touchedActors.Clear();
foreach (var actor in scene.GetActors())
{
Rectangle boundingBoxActor;
if (actor.GetType() == typeof(ShopKeeper))
{
ShopKeeper shopKeeper = actor as ShopKeeper;
boundingBoxActor = shopKeeper.BoundingBox;
if (!BoundingBox.Intersects(boundingBoxActor))
{
continue;
}
IsTouchingShopkeeper = true;
if (character.InvTreasure != null)
{
shopKeeper.ContactPlayer = true;
}
}
else
{
boundingBoxActor = new Rectangle((int)actor.GetPosition().X,
(int)(actor.GetPosition().Y - actor.GetSize().Y),
(int)actor.GetSize().X, (int)actor.GetSize().Y);
if (!BoundingBox.Intersects(boundingBoxActor))
{
continue;
}
if (actor.GetType() == typeof(Projectile) && character.GetPosession().GetType() != typeof(AiIndigenController))
{
scene.MatchSoundManager.PlaySoundEffect(SoundEffectEnumeration.Hit);
((Projectile)actor).DestroyProjectile();
IsStunned = true;
CurrentStunTime = ProjectileConfig.BULLET_STUN_TIME;
}
}
touchedActors.Add(actor);
}
foreach (Foliage foliage in scene.GetFoliage())
{
Rectangle boundingBoxActor = new Rectangle((int)foliage.GetPosition().X,
(int)(foliage.GetPosition().Y - foliage.GetSize().Y),
(int)foliage.GetSize().X, (int)foliage.GetSize().Y);
if (!BoundingBox.Intersects(boundingBoxActor))
{
continue;
}
if (foliage.Active)
{
contactFoliage = true;
}
touchedActors.Add(foliage);
}
}