public void Draw(SpriteBatch spriteBatch, Camera camera)
{
Point min = ConvertPositionToCell(camera.position);
Point max = ConvertPositionToCell(camera.position + new Vector2(
spriteBatch.GraphicsDevice.Viewport.Width + TileWidth - 1,
spriteBatch.GraphicsDevice.Viewport.Height + TileHeight - 1));
foreach (MapLayer layer in Layers)
layer.Draw(spriteBatch, camera, min, max);
}
public void Draw(SpriteBatch batch, Camera camera, Point min, Point max)
{
batch.Begin(SpriteSortMode.Texture, BlendState.AlphaBlend, SamplerState.PointClamp, null, null, null, camera.TransformMatrix);
min.X = (int)Math.Max(min.X, 0);
min.Y = (int)Math.Max(min.Y, 0);
max.X = (int)Math.Min(max.X, Width);
max.Y = (int)Math.Min(max.Y, Width);
for (int x = min.X; x < max.X; x++)
{
for (int y = min.Y; y < max.Y; y++)
{
int textureIndex = map[y, x];
Texture2D texture = textures[0];
Rectangle source = new Rectangle(0,0,16,16);
if (textureIndex == -1) // It's empty. Is there anything interesting near it?
{
//Directions named from where the tile is coming.
bool up = false, down = false, left =false, right = false;
bool dl = false, dr = false, ul = false, ur = false;
//Work out where there IS a tile on this layer
if (y > 0 && GetCellIndex(x, y - 1) == 0)
down = true;
if (y < Height && GetCellIndex(x, y + 1) == 0)
up = true;
if (x > 0 && GetCellIndex(x - 1, y) == 0)
left = true;
if (x < Width && GetCellIndex(x + 1, y) == 0)
right = true;
if (x > 0 && y > 0 && GetCellIndex(x - 1, y - 1) == 0)
ul = true;
if (x > 0 && y < Height && GetCellIndex(x - 1, y + 1) == 0)
dl = true;
if (x < Width && y > 0 && GetCellIndex(x + 1, y - 1) == 0)
ur = true;
if (x < Width && y < Width && GetCellIndex(x + 1, y + 1) == 0)
dr = true;
//If no tiles need to be drawn around this one, then skip testing for drawing.
if (!down && !up && !left && !right && !ul && !dl && !ur && !dr)
continue;
//Corners
if (dl && !up && !left)
fringeDraw(batch, x, y, 80, 0);
if (dr && !up && !right)
fringeDraw(batch, x, y, 48, 0);
if (ur && !down && !right)
fringeDraw(batch, x, y, 48, 32);
if (ul && !down && !left)
fringeDraw(batch, x, y, 80, 32);
//One side
if (down && !left && !up && !right)
fringeDraw(batch, x, y, 64, 32);
else if (!down && left && !up && !right)
fringeDraw(batch, x, y, 80, 16);
else if (!down && !left && up && !right)
fringeDraw(batch, x, y, 64, 0);
else if (!down && !left && !up && right)
fringeDraw(batch, x, y, 48, 16);
//Two sides (corner)
else if (down && left && !up && !right)
fringeDraw(batch, x, y, 0, 16);
else if (down && !left && !up && right)
fringeDraw(batch, x, y, 16, 16);
else if (!down && left && up && !right)
fringeDraw(batch, x, y, 0, 32);
else if (!down && !left && up && right)
fringeDraw(batch, x, y, 16, 32);
// Two sides (opposite)
else if (down && !left && up && !right)
{
fringeDraw(batch, x, y, 64, 0);
fringeDraw(batch, x, y, 64, 32);
}
else if (!down && left && !up && right)
{
fringeDraw(batch, x, y, 48, 16);
fringeDraw(batch, x, y, 80, 16);
}
//Three sides
else if (down && left && right && !up)
fringeDraw(batch, x, y, 32, 16);
else if (!down && left && right && up)
fringeDraw(batch, x, y, 32, 32);
else if (down && left && !right && up)
fringeDraw(batch, x, y, 16, 0);
else if (down && !left && right && up)
fringeDraw(batch, x, y, 32, 0);
//Four sides
else if (down && left && right && up)
fringeDraw(batch, x, y, 64, 16);
}
else //It's a 0 and hence is actually a tile we need to draw fully
batch.Draw(
texture,
new Rectangle(
x * Map.TileWidth,
y * Map.TileHeight,
Map.TileWidth,
Map.TileHeight),
source,
Color.White
);
}
}
batch.End();
}