public bool CheckAABBCollision(AABB rect)
{
//return !(rect.y1 > y2 || rect.x1 > x2 || rect.x2 < x1 || rect.y2 < y1);
if (rect.y1 > y2) return false;
if (rect.x1 > x2) return false;
if (rect.x2 < x1) return false;
if (rect.y2 < y1) return false;
return true;
}
public Vector2 SolveCollision(AABB rect)
{
// If the two AABBs don't collide, do nothing:
//if (rect.y1 > y2) return Vector2.Zero;
//if (rect.x1 > x2) return Vector2.Zero;
//if (rect.x2 < x1) return Vector2.Zero;
//if (rect.y2 < y1) return Vector2.Zero;
if (!CheckAABBCollision(rect)) return Vector2.Zero;
float Y1 = y1 - rect.y2; // distance to move object up
float X1 = x1 - rect.x2; // distance to move object left
float X2 = x2 - rect.x1; // distance to move object right
float Y2 = y2 - rect.y1; // distance to move object down
float aX1 = Math.Abs(X1);
float aX2 = Math.Abs(X2);
float aY1 = Math.Abs(Y1);
float aY2 = Math.Abs(Y2);
/*
// Allow player to go up stairs!!
if (!omitTop && (!omitLeft || !omitRight) && aY1 < Level.collisionSize.Y * 1.5) {
if (rect.physObj != null) {
Line path = rect.physObj.GetMovementPath();
if (Math.Abs(path.nx) >= .25) {
return new Vector2(0, Y1);
}
}
}
*/
if (incline)
{
if (aY1 <= aX1 && aY1 <= aX2 && aY1 <= aY2) return omitTop ? Vector2.Zero : new Vector2(0, Y1); // move up
if (aX1 <= aY1 && aX1 <= aY2 && aX1 <= aX2) return omitLeft ? Vector2.Zero : new Vector2(X1, 0); // move left
if (aX2 <= aY1 && aX2 <= aY2 && aX2 <= aX1) return omitRight ? Vector2.Zero : new Vector2(X2, 0); // more right
if (aY2 <= aX1 && aY2 <= aX2 && aY2 <= aY1) return omitBottom ? Vector2.Zero : new Vector2(0, Y2); // move down
}
else
{
if (aY1 <= aX1 && aY1 <= aX2 && aY1 <= aY2) if (!omitTop) return new Vector2(0, Y1); // move up
if (aX1 <= aY1 && aX1 <= aY2 && aX1 <= aX2) if (!omitLeft) return new Vector2(X1, 0); // move left
if (aX2 <= aY1 && aX2 <= aY2 && aX2 <= aX1) if (!omitRight) return new Vector2(X2, 0); // more right
if (aY2 <= aX1 && aY2 <= aX2 && aY2 <= aY1) if (!omitBottom) return new Vector2(0, Y2); // move down
}
return Vector2.Zero;
}
public static void CheckEnvironment(PhysObj obj)
{
Point cornerTopLeft = PositionToGrid(new Vector2(obj.hitBox.Left(), obj.hitBox.Top()));
Point cornerBottomRight = PositionToGrid(new Vector2(obj.hitBox.Right(), obj.hitBox.Bottom()));
bool collision = false;
float friction = obj.frictionMultiplier;
List<AABB> collisionList = new List<AABB>();
List<float> frictionList = new List<float>();
for (int y = cornerTopLeft.Y; y <= cornerBottomRight.Y; y++)
{
for (int x = cornerTopLeft.X; x <= cornerBottomRight.X; x++)
{
if (CheckCollision(new Point(x, y)))
{
AABB aabb = new AABB(null, GridToPosition(new Point(x, y)), new Vector2(collisionSize));
if (environmentData[x, y].inclineType != InclineType.Flat)
{
aabb = SolveIncline(obj, x, y);
}
if (environmentData[x, y].oneWayPlatform)
{
aabb.omitLeft = true;
aabb.omitRight = true;
aabb.omitBottom = true;
if (obj.speed.Y < 0 || obj.ignoreOneWay)
{
aabb.omitTop = true;
}
}
if ((CheckCollision(x - 1, y) && !environmentData[x - 1, y].oneWayPlatform) || environmentData[x, y].omitLeft) aabb.omitLeft = true;
if ((CheckCollision(x + 1, y) && !environmentData[x + 1, y].oneWayPlatform) || environmentData[x, y].omitRight) aabb.omitRight = true;
if ((CheckCollision(x, y + 1) && !environmentData[x, y + 1].oneWayPlatform) || environmentData[x, y].omitBottom) aabb.omitBottom = true;
if ((CheckCollision(x, y - 1) && !environmentData[x, y - 1].oneWayPlatform) || environmentData[x, y].omitTop) aabb.omitTop = true;
//if (CheckCollision(x - 1, y) && environmentData[x,y].inclineType == InclineType.Flat)
//{
// if (environmentData[x - 1, y].inclineType != InclineType.Flat && (obj.position.X > aabb.x1 && obj.position.X < aabb.x2)) aabb.omitTop = true;
//}
collisionList.Add(aabb);
collision = true;
frictionList.Add(GetFriction(obj, environmentData[x, y]));
}
CheckCurrent(obj, x, y);
if (IsLegalXY(x,y) && environmentData[x, y].killZone)
{
obj.Die();
}
}
}
Point checkBelow = PositionToGrid(new Vector2(obj.position.X, obj.hitBox.Bottom() + 1));
if (CheckCollision(checkBelow))
{
if (environmentData[checkBelow.X, checkBelow.Y].inclineType != InclineType.Flat)
{
//Trace.WriteLine("Barf!");
if (!obj.jumpingLegacy)
{
//AABB aabb = new AABB(null, GridToPosition(checkBelow), new Vector2(collisionSize));
//aabb = SolveIncline(obj, checkBelow.X, checkBelow.Y);
//obj.hitBox.SetPosition(obj.hitBox.GetPosition() + new Vector2(0, aabb.y2 - obj.hitBox.Bottom()));
//collisionList.Add(aabb);
//frictionList.Add(GetFriction(obj, environmentData[checkBelow.X, checkBelow.Y]));
obj.nextForce.Y += 20;
}
}
}
//int y1 = cornerBottomRight.Y + 1;
//for (int x = cornerTopLeft.X; x <= cornerBottomRight.X; x++)
//{
// if (CheckCollision(x, y1))
// {
// AABB aabb = new AABB(null, GridToPosition(new Point(x, y1)), new Vector2(collisionSize));
// if (environmentData[x, y1].inclineType != InclineType.Flat)
// {
// obj.position += new Vector2(0, 32);
// collisionList.Add(aabb);
// frictionList.Add(GetFriction(obj, environmentData[x, y1]));
// }
// }
//}
//if (collision == false)
//{
// if (obj.state == PhysState.Grounded)
//{ //check to see if there's ground beneath the object:
//Point under = PositionToGrid(obj.tempPosition);
//under.Y += 1;
//if (CheckCollision(under.X, under.Y))
//{
// collision = true;
//}
//if (!collision) obj.state = PhysState.Air;
//int y = cornerBottomRight.Y + 1;
//for (int x = cornerTopLeft.X; x < cornerBottomRight.X; x++)
//{
// if (CheckCollision(x, y))
// {
// collision = true;
// break;
// }
//}
//if (!collision) obj.state = PhysState.Air;
// }
// return;
//}
foreach (AABB aabb in collisionList)
{
Vector2 solution = aabb.SolveCollision(obj.hitBox.GetAABB());
obj.hitBox.SetPosition(obj.hitBox.GetPosition() + solution);
if (solution.Y < 0)
{
friction = frictionList.ElementAt(collisionList.IndexOf(aabb));
}
}
Vector2 newpos = obj.hitBox.GetPosition();
if (newpos.Y != obj.tempPosition.Y) obj.speed.Y = SolveBounce(obj, true);
if (newpos.X != obj.tempPosition.X) obj.speed.X = SolveBounce(obj, false);
if (newpos.Y < obj.tempPosition.Y)
{
obj.state = PhysState.Grounded;
}
obj.tempPosition = newpos;
if (obj.state == PhysState.Grounded)
{
obj.frictionMultiplier = friction;
if (friction == EnvironmentData.NORMAL)
{
obj.moveForce = 1;
}
else if (friction == EnvironmentData.ICE)
{
obj.moveForce = .2f;
}
}
else
{
obj.frictionMultiplier = EnvironmentData.AIR;
obj.moveForce = .2f;
}
}
public AABB GetAABB()
{
AABB aabb = new AABB(physObj, WorldCornerMin, Size);
aabb.omitTop = omitTop;
aabb.omitBottom = omitBottom;
aabb.omitRight = omitRight;
aabb.omitLeft = omitLeft;
return aabb;
}
public static AABB SolveIncline(PhysObj obj, int x, int y)
{
bool omitTop = false;
Vector2 cornerTopLeft = GridToPosition(new Point(x, y));
Vector2 cornerBottomRight = cornerTopLeft + new Vector2(collisionSize);
float thirdSize = collisionSize / 3;
float halfSize = collisionSize / 2;
switch (environmentData[x, y].inclineType)
{
case InclineType.ThreeTileRight1:
float ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerBottomRight.Y + ratio * (thirdSize);
break;
case InclineType.ThreeTileRight2:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
cornerTopLeft.Y = cornerBottomRight.Y - (thirdSize) + ratio * (thirdSize);
if (ratio > 0 || ratio < -1) omitTop = true;
break;
case InclineType.ThreeTileRight3:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerBottomRight.Y - (2 * thirdSize) + ratio * (thirdSize);
break;
case InclineType.ThreeTileLeft1:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerTopLeft.Y - ratio * (thirdSize);
break;
case InclineType.ThreeTileLeft2:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
//if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerTopLeft.Y + (thirdSize) - ratio * (thirdSize);
break;
case InclineType.ThreeTileLeft3:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerTopLeft.Y + (2 * thirdSize) - ratio * (thirdSize);
break;
case InclineType.TwoTileRight1:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerBottomRight.Y + ratio * (halfSize);
break;
case InclineType.TwoTileRight2:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerBottomRight.Y - (halfSize) + ratio * (halfSize);
break;
case InclineType.TwoTileLeft1:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerTopLeft.Y - ratio * (halfSize);
break;
case InclineType.TwoTileLeft2:
ratio = (cornerTopLeft.X - obj.tempPosition.X) / collisionSize;
if (ratio > 0 || ratio < -1) omitTop = true;
cornerTopLeft.Y = cornerTopLeft.Y + (halfSize) - ratio * (halfSize);
break;
}
AABB aabb = new AABB(null, cornerTopLeft.X, cornerTopLeft.Y, cornerBottomRight.X, cornerBottomRight.Y);
aabb.omitLeft = true;
aabb.omitRight = true;
if (omitTop)
{
aabb.omitTop = true;
aabb.omitBottom = true;
}
aabb.incline = true;
return aabb;
}
