public static void DrawPolygon(SpriteBatch batch, Texture2D blank, float width, Color color, Polygon p)
{
foreach (Edge e in p.Edges)
{
DrawLine(batch, blank, width, color, e);
}
}
public static Polygon RelativeToCamera(Polygon p)
{
Polygon tmpPol = new Polygon();
foreach (Edge e in p.Edges)
{
tmpPol.Edges.Add(Camera.RelativeToCamera(e));
}
return tmpPol;
}
public static bool PointInPolygon(Point point, Polygon polygon)
{
bool inside = false;
foreach (var side in polygon.Edges)
{
if (point.Y > Math.Min(side.StartVertex.Y, side.EndVertex.Y))
if (point.Y <= Math.Max(side.StartVertex.Y, side.EndVertex.Y))
if (point.X <= Math.Max(side.StartVertex.X, side.EndVertex.X))
{
float xIntersection = side.StartVertex.X + ((point.Y - side.StartVertex.Y) / (side.EndVertex.Y - side.StartVertex.Y)) * (side.EndVertex.X - side.StartVertex.X);
if (point.X <= xIntersection)
inside = !inside;
}
}
return inside;
}
/// <summary>
/// Só serve se for um losango
/// </summary>
/// <param name="p">Losango</param>
/// <returns>O ponto central do losango</returns>
public static Point CalculateCenter(Polygon p)
{
Edge e1 = p.Edges[0];
Edge e2 = p.Edges[1];
Edge e3 = p.Edges[2];
//int x = Convert.ToInt32(Math.Ceiling(e1.StartVertex.X + (e2.EndVertex.X / 2)));
//int y = Convert.ToInt32(Math.Ceiling(e3.EndVertex.Y - (e2.StartVertex.Y / 2)));
int x = Convert.ToInt32(e1.StartVertex.X + (e2.EndVertex.X / 2));
int y1 = Convert.ToInt32(e1.EndVertex.Y > 0 ? e1.EndVertex.Y : e1.EndVertex.Y * -1);
int y2 = Convert.ToInt32(e3.EndVertex.Y > 0 ? e3.EndVertex.Y : e3.EndVertex.Y * -1);
int y = Convert.ToInt32((y1 + y2) / 2);
//Vector2.dis
return new Point(x, y);
}
private void CalculateEdges()
{
TopPolygon = new Polygon();
//primeira aresta "de cima"
/*
* Start
* /
* /
* /
* End
* */
TopPolygon.Edges.Add(new Edge()
{
StartVertex = new Vector2
(
Position.Left + BaseWidth / 2, //posição X + largura / 2
Position.Top //Y do topo do retangulo
),
EndVertex = new Vector2
(
Position.Left, //X do retangulo
Position.Top + BaseHeight / 2 //positção Y + altura / 4
)
});
//segunda aresta "de cima"
/*
* End
* \
* \
* \
* Start
* */
TopPolygon.Edges.Add(new Edge()
{
StartVertex = new Vector2
(
Position.Left + BaseWidth, //posição X + largura / 2
Position.Top + BaseHeight / 2 //posição Y + altura / 2
),
EndVertex = new Vector2
(
Position.Left + BaseWidth / 2, //posição X + largura / 2
Position.Top //Y do topo do retangulo
)
});
//primeira aresta "de baixo"
/*
* Start
* \
* \
* \
* End
* */
TopPolygon.Edges.Add(new Edge()
{
StartVertex = new Vector2
(
Position.Left, //X do retangulo
Position.Top + BaseHeight / 2 //positção Y + BaseHeight / 2
),
EndVertex = new Vector2
(
Position.Left + BaseWidth / 2, //largura / 2
Position.Y + BaseHeight //ja faço coment
)
});
//segunda aresta "de baixo"
/*
* End
* /
* /
* /
* Start
* */
TopPolygon.Edges.Add(new Edge()
{
StartVertex = new Vector2
(
Position.Left + BaseWidth / 2, //largura / 2
Position.Y + BaseHeight //ja faço coment
),
EndVertex = new Vector2
(
Position.Left + BaseWidth, //largura / 2
Position.Y + BaseHeight / 2 //ja faço coment
)
});
}
private void CalculateCityEdges()
{
MapPolygon = new Polygon();
//primeira aresta "de cima"
/*
* Start
* /
* /
* /
* End
* */
Edge e1 = new Edge
{
StartVertex = Blocks[0, 0].CityBlock.TopPolygon.Edges[0].StartVertex,
EndVertex = Blocks[0, Height - 1].CityBlock.TopPolygon.Edges[0].EndVertex
};
////segunda aresta "de cima"
///*
// * End
// * \
// * \
// * \
// * Start
// * */
Edge e2 = new Edge
{
StartVertex = Blocks[Width - 1, 0].CityBlock.TopPolygon.Edges[3].EndVertex,
EndVertex = e1.StartVertex
};
////primeira aresta "de baixo"
///*
// * Start
// * \
// * \
// * \
// * End
// * */
Edge e3 = new Edge
{
StartVertex = e1.EndVertex,
EndVertex = Blocks[Width - 1, Height - 1].CityBlock.TopPolygon.Edges[3].StartVertex
};
////segunda aresta "de baixo"
///*
// * End
// * /
// * /
// * /
// * Start
// * */
Edge e4 = new Edge
{
StartVertex = e3.EndVertex,
EndVertex = e2.StartVertex
};
MapPolygon.Edges.Add(e1);
MapPolygon.Edges.Add(e2);
MapPolygon.Edges.Add(e3);
MapPolygon.Edges.Add(e4);
}
