/// <summary>
/// Calculates a screen space rectangle based on world space bounds.
/// </summary>
public void GetScissorRectangle(Light light, out BoundingRectangle scissor)
{
Matrix transform;
Matrix.Multiply(ref ViewProjection, ref _ndcToScreen, out transform);
BoundingRectangle.Transform(ref light.Bounds, ref transform, out scissor);
}
public static void SetScissorRectangle(this GraphicsDevice device, ref BoundingRectangle bounds)
{
device.ScissorRectangle = new Rectangle(
(int)bounds.Min.X,
(int)bounds.Min.Y,
(int)(bounds.Max.X - bounds.Min.X),
(int)(bounds.Max.Y - bounds.Min.Y));
}
public bool Intersects(ref BoundingRectangle other)
{
Vector2 d1, d2;
Vector2.Subtract(ref other.Min, ref Max, out d1);
Vector2.Subtract(ref Min, ref other.Max, out d2);
if (d1.X > 0.0f || d1.Y > 0.0f)
return false;
if (d2.X > 0.0f || d2.Y > 0.0f)
return false;
return true;
}
public static void GetBounds(this Polygon polygon, out BoundingRectangle bounds)
{
Vector2 lowerBound = new Vector2(float.MaxValue, float.MaxValue);
Vector2 upperBound = new Vector2(float.MinValue, float.MinValue);
int polyCount = polygon.Count;
for (int i = 0; i < polyCount; i++)
{
if (polygon[i].X < lowerBound.X)
lowerBound.X = polygon[i].X;
if (polygon[i].X > upperBound.X)
upperBound.X = polygon[i].X;
if (polygon[i].Y < lowerBound.Y)
lowerBound.Y = polygon[i].Y;
if (polygon[i].Y > upperBound.Y)
upperBound.Y = polygon[i].Y;
}
bounds = new BoundingRectangle(lowerBound, upperBound);
}
public static void Transform(ref BoundingRectangle bounds, ref Matrix transform, out BoundingRectangle result)
{
var c1 = new Vector2(bounds.Min.X, bounds.Max.Y);
var c2 = bounds.Max;
var c3 = new Vector2(bounds.Max.X, bounds.Min.Y);
var c4 = bounds.Min;
Vector2.Transform(ref c1, ref transform, out c1);
Vector2.Transform(ref c2, ref transform, out c2);
Vector2.Transform(ref c3, ref transform, out c3);
Vector2.Transform(ref c4, ref transform, out c4);
Vector2 min, max;
Vector2.Min(ref c1, ref c2, out min);
Vector2.Min(ref min, ref c3, out min);
Vector2.Min(ref min, ref c4, out min);
Vector2.Max(ref c1, ref c2, out max);
Vector2.Max(ref max, ref c3, out max);
Vector2.Max(ref max, ref c4, out max);
result = new BoundingRectangle(min, max);
}
public bool Intersects(BoundingRectangle other)
{
return Intersects(ref other);
}
private void CalculateViewProjectionAndBounds()
{
// Calculate view projection transform.
PresentationParameters pp = Engine.Device.PresentationParameters;
ViewProjection = Matrix.Identity;
if ((_transforms & Transforms.Custom) != 0)
ViewProjection *= Custom;
if ((_transforms & Transforms.SpriteBatch) != 0)
ViewProjection *= Matrix.CreateOrthographicOffCenter(
0,
pp.BackBufferWidth,
pp.BackBufferHeight,
0,
0.0f, 1.0f);
if ((_transforms & Transforms.OriginCenter_XRight_YUp) != 0)
ViewProjection *= Matrix.CreateOrthographicOffCenter(
-pp.BackBufferWidth / 2.0f,
pp.BackBufferWidth / 2.0f,
-pp.BackBufferHeight / 2.0f,
pp.BackBufferHeight / 2.0f,
0.0f, 1.0f);
if ((_transforms & Transforms.OriginBottomLeft_XRight_YUp) != 0)
ViewProjection *= Matrix.CreateOrthographicOffCenter(
0,
pp.BackBufferWidth,
0,
pp.BackBufferHeight,
0.0f, 1.0f);
//LogViewProjection();
// Calculate inversion of viewprojection.
Matrix.Invert(ref ViewProjection, out _inverseViewProjection);
// Determine if we are dealing with an inverted (upside down) Y axis.
InvertedY = ViewProjection.M22 < 0 && ViewProjection.M11 >= 0 ||
ViewProjection.M22 >= 0 && ViewProjection.M11 < 0;
var size = new Vector2(1.0f);
var bounds = new BoundingRectangle(-size, size);
BoundingRectangle.Transform(ref bounds, ref _inverseViewProjection, out Bounds);
}
