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();
}
/// <summary>
/// Matrix transforms! Turning mouse screen coordinates into
/// in-game pixel coordinates, then scaling down to square coordinates.
/// </summary>
/// <param name="mouseX"></param>
/// <param name="mouseY"></param>
private void updateMousePosition(int mouseX, int mouseY)
{
this.mouseScreenX = mouseX;
this.mouseScreenY = mouseY;
int translatedMouseX = mouseX + Camera.Location.X;
int translatedMouseY = mouseY + Camera.Location.Y;
int wxTsx = Numerical.intDivide(Tile.TileInGameWidth * translatedMouseX, Tile.TileStepX);
int wyTsy = Numerical.intDivide(Tile.TileInGameWidth * translatedMouseY, Tile.TileStepY);
int hxTsx = Numerical.intDivide(Tile.TileInGameHeight * translatedMouseX, Tile.TileStepX);
int hyTsy = Numerical.intDivide(Tile.TileInGameHeight * translatedMouseY, Tile.TileStepY);
MouseWorldX = Numerical.intDivide(wxTsx + wyTsy, 2);
MouseWorldY = Numerical.intDivide(hxTsx - hyTsy, 2);
}
/// <summary>
/// Calculates the Y-Square coordinate from a given (in-game pixel) point
/// </summary>
/// <param name="xPos"></param>
/// <param name="yPos"></param>
/// <returns></returns>
protected int FindYSquare(int xPos, int yPos)
{
return(Numerical.intDivide(yPos, Tile.TileInGameHeight));
}
/// <summary>
/// Calculates the X-Square coordinate from a given (in-game pixel) point
/// </summary>
/// <param name="xPos"></param>
/// <param name="yPos"></param>
/// <returns></returns>
protected int FindXSquare(int xPos, int yPos)
{
return(Numerical.intDivide(xPos, Tile.TileInGameWidth));
}
