public bool Overlap(Projection other)
{
return(this.max >= other.min && other.max >= this.min);
}
protected int ShipHasCollided()
{
int currentCellX = (int)(shipPosition.X / blockSize);
int currentCellY = (int)(shipPosition.Y / blockSize);
int[,] cellsToTest =
{
{ currentCellX - 1, currentCellY + 1 },
{ currentCellX - 1, currentCellY },
{ currentCellX + 1, currentCellY - 1 },
{ currentCellX, currentCellY - 1 },
{ currentCellX - 1, currentCellY - 1 },
{ currentCellX, currentCellY },
{ currentCellX, currentCellY + 1 },
{ currentCellX + 1, currentCellY },
{ currentCellX + 1, currentCellY + 1 }
};
float shipHalfWidth = textureShip.Width / 2;
float shipHalfHeight = textureShip.Height / 2;
float yaw = (float)motionManager.DeviceMotion.Attitude.Yaw;
Vector2[] shipVertices =
{
Rotate(new Vector2(shipPosition.X, shipPosition.Y - shipHalfHeight), shipPosition, -yaw),
Rotate(new Vector2(shipPosition.X + shipHalfWidth, shipPosition.Y + shipHalfHeight), shipPosition, -yaw),
Rotate(new Vector2(shipPosition.X - shipHalfWidth, shipPosition.Y + shipHalfHeight), shipPosition, -yaw)
};
Vector2[] shipAxes =
{
Normal(shipVertices[1] - shipVertices[0]),
Normal(shipVertices[2] - shipVertices[1]),
Normal(shipVertices[0] - shipVertices[2])
};
for (int i = 0; i < cellsToTest.GetLength(0); i++)
{
int x = cellsToTest[i, 0];
int y = cellsToTest[i, 1];
if (x >= 24 || y >= 24)
{
continue;
}
if (map[y, x] == 1 || map[y, x] == 2)
{
int cellWorldX = x * blockSize;
int cellWorldY = y * blockSize;
// SAT
Vector2[] blockVertices =
{
new Vector2(cellWorldX, cellWorldY),
new Vector2(cellWorldX + blockSize, cellWorldY),
new Vector2(cellWorldX + blockSize, cellWorldY + blockSize),
new Vector2(cellWorldX, cellWorldY + blockSize)
};
Vector2[] blockAxes =
{
Normal(blockVertices[1] - blockVertices[0]),
Normal(blockVertices[2] - blockVertices[1])
};
bool foundGap = false;
for (int j = 0; j < blockAxes.Length; j++)
{
Vector2 axis = blockAxes[j];
Projection blockProjection = CreateProjection(axis, blockVertices);
Projection shipProjection = CreateProjection(axis, shipVertices);
if (!blockProjection.Overlap(shipProjection))
{
foundGap = true;
break;
}
}
if (foundGap)
{
continue;
}
for (int j = 0; j < shipAxes.Length; j++)
{
Vector2 axis = shipAxes[j];
Projection shipProjection = CreateProjection(axis, shipVertices);
Projection blockProjection = CreateProjection(axis, blockVertices);
if (!shipProjection.Overlap(blockProjection))
{
foundGap = true;
break;
}
}
if (!foundGap)
{
return(map[y, x]);
}
// AABB
/*
* if (shipPosition.X <= cellWorldX + blockSize &&
* shipPosition.X + shipSize > cellWorldX &&
* shipPosition.Y <= cellWorldY + blockSize &&
* shipPosition.Y + shipSize >= cellWorldY)
* {
* return true;
* }
*/
}
}
return(-1);
}
