private Vector2 SnapToGrid(Vector2 position, Rectangle gridArea, float zoom, Vector2 gridSize, float tolerance)
{
gridSize *= zoom;
if (gridSize.X < 1.0f)
{
return(position);
}
if (gridSize.Y < 1.0f)
{
return(position);
}
Vector2 snappedPos = position;
snappedPos.X -= gridArea.X;
snappedPos.Y -= gridArea.Y;
Vector2 gridPos = new Vector2(
MathUtils.RoundTowardsClosest(snappedPos.X, gridSize.X),
MathUtils.RoundTowardsClosest(snappedPos.Y, gridSize.Y));
if (Math.Abs(gridPos.X - snappedPos.X) < tolerance)
{
snappedPos.X = gridPos.X;
}
if (Math.Abs(gridPos.Y - snappedPos.Y) < tolerance)
{
snappedPos.Y = gridPos.Y;
}
snappedPos.X += gridArea.X;
snappedPos.Y += gridArea.Y;
return(snappedPos);
}
public static void DrawGrid(SpriteBatch spriteBatch, int gridCells, Vector2 gridCenter, Vector2 roundedGridCenter, float alpha = 1.0f)
{
var horizontalLine = GUI.Style.GetComponentStyle("HorizontalLine").GetDefaultSprite();
var verticalLine = GUI.Style.GetComponentStyle("VerticalLine").GetDefaultSprite();
Vector2 topLeft = roundedGridCenter - Vector2.One * GridSize * gridCells / 2;
Vector2 bottomRight = roundedGridCenter + Vector2.One * GridSize * gridCells / 2;
for (int i = 0; i < gridCells; i++)
{
float distFromGridX = (MathUtils.RoundTowardsClosest(gridCenter.X, GridSize.X) - gridCenter.X) / GridSize.X;
float distFromGridY = (MathUtils.RoundTowardsClosest(gridCenter.X, GridSize.Y) - gridCenter.X) / GridSize.Y;
float normalizedDistX = Math.Abs(i + distFromGridX - gridCells / 2) / (gridCells / 2);
float normalizedDistY = Math.Abs(i - distFromGridY - gridCells / 2) / (gridCells / 2);
float expandX = MathHelper.Lerp(30.0f, 0.0f, normalizedDistX);
float expandY = MathHelper.Lerp(30.0f, 0.0f, normalizedDistY);
GUI.DrawLine(spriteBatch,
horizontalLine,
new Vector2(topLeft.X - expandX, -bottomRight.Y + i * GridSize.Y),
new Vector2(bottomRight.X + expandX, -bottomRight.Y + i * GridSize.Y),
Color.White * (1.0f - normalizedDistY) * alpha, depth: 0.6f, width: 3);
GUI.DrawLine(spriteBatch,
verticalLine,
new Vector2(topLeft.X + i * GridSize.X, -topLeft.Y + expandY),
new Vector2(topLeft.X + i * GridSize.X, -bottomRight.Y - expandY),
Color.White * (1.0f - normalizedDistX) * alpha, depth: 0.6f, width: 3);
}
}
