public SolidRectangle(float width, float height)
{
Polygon = Polygon.CreateRectangle(width, height);
var graphic = new CCDrawNode();
graphic.DrawRect(
new CCRect(-width / 2, -height / 2, width, height),
fillColor: CCColor4B.Blue);
this.AddChild(graphic);
this.AddChild(Polygon);
}
public static Polygon CreateRectangle(float width, float height)
{
var polygon = new Polygon();
var points = new CCPoint[] {
new CCPoint(-width/2, -height/2),
new CCPoint(-width/2, height/2),
new CCPoint(width/2, height/2),
new CCPoint(width/2, -height/2),
new CCPoint(-width/2, -height/2)
};
polygon.Points = points;
return polygon;
}
public static CCPoint GetSeparationVector(Circle circle, Polygon polygon)
{
bool isCircleCenterInPolygon = polygon.IsPointInside(
circle.PositionWorldspace.X, circle.PositionWorldspace.Y);
float distance;
var normal = polygon.GetNormalClosestTo(circle.PositionWorldspace, out distance);
if (isCircleCenterInPolygon)
{
distance += circle.Radius;
}
else
{
distance = circle.Radius - distance;
}
// increase the distance by a small amount to make sure that the objects do separate:
distance += .5f;
var separation = normal * distance;
return separation;
}
private static bool FruitPolygonCollision(Fruit fruit, Polygon polygon, CCPoint polygonVelocity)
{
// Test whether the fruit collides
bool didCollide = polygon.CollideAgainst(fruit.Collision);
if (didCollide)
{
var circle = fruit.Collision;
// Get the separation vector to reposition the fruit so it doesn't overlap the polygon
var separation = CollisionResponse.GetSeparationVector(circle, polygon);
fruit.Position += separation;
// Adjust the fruit's Velocity to make it bounce:
var normal = separation;
normal.Normalize();
fruit.Velocity = CollisionResponse.ApplyBounce(
fruit.Velocity,
polygonVelocity,
normal,
GameCoefficients.FruitCollisionElasticity);
}
return didCollide;
}