private void ApplyWind(Vector2 position)
{
Vector2 min = Vector2.Subtract(position, new Vector2(0, 100));
Vector2 max = Vector2.Add(position, new Vector2(300, 100));
AABB aabb = new AABB(ref min, ref max);
foreach (Body body in _physicsSimulator.BodyList)
{
if (aabb.Contains(body.Position))
{
body.ApplyForce(new Vector2(400,0));
}
}
}
private void ApplyExplosion(Vector2 position)
{
Vector2 min = Vector2.Subtract(position, new Vector2(100, 100));
Vector2 max = Vector2.Add(position, new Vector2(100, 100));
AABB aabb = new AABB(ref min, ref max);
foreach (Body body in _physicsSimulator.BodyList)
{
if (aabb.Contains(body.Position))
{
Vector2 fv = body.Position;
fv = Vector2.Subtract(fv, position);
fv.Normalize();
fv = Vector2.Multiply(fv, 50000);
body.ApplyForce(fv);
}
}
}
// This is used in my editing application.
/// <summary>
/// Gets index of control point if point is inside it.
/// </summary>
/// <param name="point">Point to test against.</param>
/// <returns>Index of control point or -1 if no intersection.</returns>
public int PointInControlPoint(Vector2 point)
{
AABB controlPointAABB;
foreach (Vector2 controlPoint in _controlPoints)
{
controlPointAABB =
new AABB(
new Vector2(controlPoint.X - (_controlPointSize/2), controlPoint.Y - (_controlPointSize/2)),
new Vector2(controlPoint.X + (_controlPointSize/2), controlPoint.Y + (_controlPointSize/2)));
if (controlPointAABB.Contains(ref point))
return _controlPoints.IndexOf(controlPoint);
}
return -1;
}
/// <summary>
/// tells you if drawing the texture will actually draw onscreen.
/// </summary>
/// <param name="tex">
/// the texture to check.
/// </param>
/// <param name="position">
/// the position of the texture's center.
/// </param>
/// <param name="origin">
/// a Vector2 equaling half of the texture's size.
/// </param>
/// <param name="rotation">
/// the rotation of the texture, in radians.
/// </param>
/// <returns>
/// a bool indicating whether you should draw this texture.
/// </returns>
public bool ShouldDraw(Texture2D tex, Vector2 position, Vector2 origin, float rotation)
{
Matrix textureMatrix = Matrix.CreateRotationZ(rotation) * Matrix.CreateTranslation(new Vector3(position, 0));
Vector2 topLeft = Vector2.Transform(-origin, textureMatrix);
Vector2 topRight = Vector2.Transform(new Vector2(origin.X, -origin.Y), textureMatrix);
Vector2 botLeft = Vector2.Transform(new Vector2(-origin.X, origin.Y), textureMatrix);
Vector2 botRight = Vector2.Transform(origin, textureMatrix);
AABB texAABB = new AABB();
if (rotation >= 0 && rotation <= MathHelper.PiOver2)
{
Vector2 v1 = new Vector2(botLeft.X, topLeft.Y);
Vector2 v2 = new Vector2(topRight.X, botRight.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > MathHelper.PiOver2 && rotation <= MathHelper.Pi)
{
Vector2 v1 = new Vector2(botRight.X, botLeft.Y);
Vector2 v2 = new Vector2(topLeft.X, topRight.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > MathHelper.Pi && rotation <= (MathHelper.Pi + MathHelper.PiOver2))
{
Vector2 v1 = new Vector2(botRight.X, topRight.Y);
Vector2 v2 = new Vector2(botLeft.X, topLeft.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > (MathHelper.Pi + MathHelper.PiOver2) && rotation <= MathHelper.TwoPi)
{
Vector2 v1 = new Vector2(topLeft.X, topRight.Y);
Vector2 v2 = new Vector2(botRight.X, botLeft.Y);
texAABB = new AABB(ref v1, ref v2);
}
Matrix simpleCameraMatrix = Matrix.Identity *
Matrix.CreateTranslation(new Vector3(-_position, 0)) *
Matrix.CreateRotationZ(_rotation) *
Matrix.CreateTranslation(new Vector3(-_size / 2, 0));
Vector2 camOrigin = (_size * (1 / _zoom));
topLeft = Vector2.Transform(-camOrigin, simpleCameraMatrix);
topRight = Vector2.Transform(new Vector2(camOrigin.X, -camOrigin.Y), simpleCameraMatrix);
botLeft = Vector2.Transform(new Vector2(-camOrigin.X, camOrigin.Y), simpleCameraMatrix);
botRight = Vector2.Transform(camOrigin, simpleCameraMatrix);
AABB camAABB = new AABB();
if (rotation >= 0 && rotation <= MathHelper.PiOver2)
{
Vector2 v1 = new Vector2(botLeft.X, topLeft.Y);
Vector2 v2 = new Vector2(topRight.X, botRight.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > MathHelper.PiOver2 && rotation <= MathHelper.Pi)
{
Vector2 v1 = new Vector2(botRight.X, botLeft.Y);
Vector2 v2 = new Vector2(topLeft.X, topRight.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > MathHelper.Pi && rotation <= (MathHelper.Pi + MathHelper.PiOver2))
{
Vector2 v1 = new Vector2(botRight.X, topRight.Y);
Vector2 v2 = new Vector2(botLeft.X, topLeft.Y);
texAABB = new AABB(ref v1, ref v2);
}
else if (rotation > (MathHelper.Pi + MathHelper.PiOver2) && rotation <= MathHelper.TwoPi)
{
Vector2 v1 = new Vector2(topLeft.X, topRight.Y);
Vector2 v2 = new Vector2(botRight.X, botLeft.Y);
texAABB = new AABB(ref v1, ref v2);
}
if (camAABB.Contains(texAABB.Min) || camAABB.Contains(texAABB.Max))
return true;
return false;
}
// This is used in my editing application.
/// <summary>
/// Gets index of control point if point is inside it.
/// </summary>
/// <param name="point">Point to test against.</param>
/// <returns>Index of control point or -1 if no intersection.</returns>
public int PointInControlPoint(Vector2 point)
{
AABB controlPointAABB;
Vector2 temp1;
Vector2 temp2;
foreach (Vector2 controlPoint in _controlPoints)
{
temp1 = new Vector2(controlPoint.X - (_controlPointSize / 2), controlPoint.Y - (_controlPointSize / 2));
temp2 = new Vector2(controlPoint.X + (_controlPointSize / 2), controlPoint.Y + (_controlPointSize / 2));
controlPointAABB = new AABB(ref temp1, ref temp2);
if (controlPointAABB.Contains(ref point))
return _controlPoints.IndexOf(controlPoint);
}
return -1;
}