public void Circle_ContainsPoint()
{
var circle = new Circle(new Vector2(200.0f, 300.0f), 100.0f);
var p1 = new Point(-1, -1);
var p2 = new Point(110, 300);
var p3 = new Point(200, 300);
var p4 = new Point(290, 300);
var p5 = new Point(400, 400);
bool result;
circle.Contains(ref p1, out result);
Assert.AreEqual(false, result);
circle.Contains(ref p2, out result);
Assert.AreEqual(true, result);
circle.Contains(ref p3, out result);
Assert.AreEqual(true, result);
circle.Contains(ref p4, out result);
Assert.AreEqual(true, result);
circle.Contains(ref p5, out result);
Assert.AreEqual(false, result);
Assert.AreEqual(false, circle.Contains(p1));
Assert.AreEqual(true, circle.Contains(p2));
Assert.AreEqual(true, circle.Contains(p3));
Assert.AreEqual(true, circle.Contains(p4));
Assert.AreEqual(false, circle.Contains(p5));
}
public void Circle_ContainsFloats()
{
var circle = new Circle(new Vector2(200.0f, 300.0f), 100.0f);
float x1 = -1; float y1 = -1;
float x2 = 110; float y2 = 300;
float x3 = 200; float y3 = 300;
float x4 = 290; float y4 = 300;
float x5 = 400; float y5 = 400;
Assert.AreEqual(false, circle.Contains(x1, y1));
Assert.AreEqual(true, circle.Contains(x2, y2));
Assert.AreEqual(true, circle.Contains(x3, y3));
Assert.AreEqual(true, circle.Contains(x4, y4));
Assert.AreEqual(false, circle.Contains(x5, y5));
}
public void Circle_ContainsCircle()
{
var circle = new Circle(new Vector2(200.0f, 300.0f), 100.0f);
var circle1 = new Circle(new Vector2(199.0f, 299.0f), 100.0f);
var circle2 = new Circle(new Vector2(200.0f, 300.0f), 25.0f);
var circle3 = new Circle(new Vector2(200.0f, 300.0f), 100.0f);
var circle4 = new Circle(new Vector2(201.0f, 301.0f), 100.0f);
bool result;
circle.Contains(ref circle1, out result);
Assert.AreEqual(false, result);
circle.Contains(ref circle2, out result);
Assert.AreEqual(true, result);
circle.Contains(ref circle3, out result);
Assert.AreEqual(true, result);
circle.Contains(ref circle4, out result);
Assert.AreEqual(false, result);
Assert.AreEqual(false, circle.Contains(circle1));
Assert.AreEqual(true, circle.Contains(circle2));
Assert.AreEqual(true, circle.Contains(circle3));
Assert.AreEqual(false, circle.Contains(circle4));
}
public static bool Collides(Rectangle r, Circle c)
{
// check if the center of the circle is in the rectangle
if (r.Contains(c.Center))
return true;
// check if the circle's "outer box" doesn't intersect the rectangle
Rectangle outerBounds = new Rectangle(new Point(c.Left, c.Top), new Point(c.Radius * 2));
if (!r.Intersects(outerBounds))
return false;
// check if the circle contains any of the rectangle's corners
Point corner = new Point(r.Left, r.Top);
if (c.Contains(corner))
return true;
corner.X = r.Right;
if (c.Contains(corner))
return true;
corner.Y = r.Bottom;
if (c.Contains(corner))
return true;
corner.X = r.Left;
if (c.Contains(corner))
return true;
// check for a top/bottom rectangle edge collision
if(AxisMath.Between(c.Center.X, r.Left, r.Right))
{
// check top edge
if (c.Bottom >= r.Top)
return true;
// check bottom edge
if (c.Top <= r.Bottom)
return true;
}
// check for a left/right rectangle edge collision
if(AxisMath.Between(c.Center.Y, r.Top, r.Bottom))
{
// check left edge
if (c.Right >= r.Left)
return true;
// check right edge
if (c.Left <= r.Right)
return true;
}
// if all else fails, return false
return false;
}