/// <summary>
/// Returns the cached value for the MapCell at (x, y).
/// Assumes this value is actually contained in the cache
/// and may have undesired behavior if not (anything from
/// array bounds exceptions to just returning wrong data).
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public MapCellType Get(int x, int y)
{
return(cache[
Numerical.Mod(x - xMin + xStartIndex, cacheWidth),
Numerical.Mod(y - yMin + yStartIndex, cacheHeight)
]);
}
public virtual void Draw(GameTime gameTime)
{
spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
float maxdepth = ((squaresWideToDraw + 1) + ((squaresTallToDraw + 1) * Tile.TileWidth)) * 10;
//converts pixels to steps
int leftX = Numerical.intDivide(Camera.Location.X, Tile.TileStepX);
int topY = Numerical.intDivide(Camera.Location.Y, Tile.TileStepY);
//if the sum is now odd, we will get weird errors, so just move over a little
//we will fix the inelegance with more offset
if (Numerical.Mod(leftX + topY, 2) == 1)
{
leftX--;
}
int firstX = (leftX + topY) / 2 - 1;
int firstY = (leftX - topY) / 2;
int offsetX = Camera.Location.X - (firstX + firstY) * Tile.TileStepX;
int offsetY = Camera.Location.Y - (firstX - firstY) * Tile.TileStepY;
drawTileMapCells(maxdepth, firstX, firstY, offsetX, offsetY);
drawInGameObjects(maxdepth, firstX, firstY, offsetX, offsetY);
spriteBatch.End();
}
private void addRightColumn()
{
//set up the new right column, which replaces the old left column
for (int y = 0; y < cacheHeight; y++)
{
cache[xStartIndex, Numerical.Mod(y + yStartIndex, cacheHeight)] = map.MakeMapCell(xMin + cacheWidth, y + yMin);
}
//updates the minimum
xMin++;
//fixes the indexing
xStartIndex = Numerical.Mod(xStartIndex + 1, cacheWidth);
}
private void addLeftColumn()
{
//allows for the next left column
xMin--;
//fixes the indexing
xStartIndex = Numerical.Mod(xStartIndex - 1, cacheWidth);
//fix the new left column
for (int y = 0; y < cacheHeight; y++)
{
cache[xStartIndex, Numerical.Mod(y + yStartIndex, cacheHeight)] = map.MakeMapCell(xMin, y + yMin);
}
}
private void addBottomRow()
{
//set up the new bottom row, which replaces the old top row
for (int x = 0; x < cacheWidth; x++)
{
cache[Numerical.Mod(x + xStartIndex, cacheWidth), yStartIndex] = map.MakeMapCell(x + xMin, yMin + cacheHeight);
}
//updates the minimum
yMin++;
//fixes the indexing
yStartIndex = Numerical.Mod(yStartIndex + 1, cacheHeight);
}
private void addTopRow()
{
//allows for a new top row
yMin--;
//fixes the indexing so that the old data is still indexed correctly
yStartIndex = Numerical.Mod(yStartIndex - 1, cacheHeight);
//now fix the new top row
for (int x = 0; x < cacheWidth; x++)
{
cache[Numerical.Mod(x + xStartIndex, cacheWidth), yStartIndex] = map.MakeMapCell(x + xMin, yMin);
}
}
