private void createWithCollider2d(Collider2D coll)
{
b2FixtureDef fixtureDef = new b2FixtureDef();
PhysicsMaterial2D material = coll.sharedMaterial;
if (material != null)
{
fixtureDef.restitution = material.bounciness;
fixtureDef.friction = material.friction;
}
fixtureDef.isSensor = coll.isTrigger;
if (coll is BoxCollider2D)
{
BoxCollider2D boxColl = coll as BoxCollider2D;
b2PolygonShape s = b2PolygonShape.AsOrientedBox(boxColl.size.x * 0.5f,
boxColl.size.y * 0.5f,
new b2Vec2(boxColl.offset.x, boxColl.offset.y),
0 /*transform.eulerAngles.z*Mathf.Deg2Rad*/);
scaleShape(s);
fixtureDef.shape = s;
_fixtureDict[coll] = new b2Fixture[] { _body.CreateFixture(fixtureDef) };
}
else if (coll is CircleCollider2D)
{
CircleCollider2D circleColl = coll as CircleCollider2D;
b2CircleShape s = new b2CircleShape(circleColl.radius);
s.SetLocalPosition(new b2Vec2(circleColl.offset.x, circleColl.offset.y));
scaleShape(s);
fixtureDef.shape = s;
_fixtureDict[coll] = new b2Fixture[] { _body.CreateFixture(fixtureDef) };
}
else if (coll is PolygonCollider2D)
{
int i, j;
PolygonCollider2D polyColl = coll as PolygonCollider2D;
List <b2Fixture> fixtureList = new List <b2Fixture>();
int pathCount = polyColl.pathCount;
for (i = 0; i < pathCount; i++)
{
Vector2[] path = polyColl.GetPath(i);
b2Vec2[] vertices = new b2Vec2[path.Length];
for (j = 0; j < path.Length; j++)
{
vertices[j] = new b2Vec2(path[j].x, path[j].y);
}
b2Separator sep = new b2Separator();
b2Fixture[] fixtures = sep.Separate(_body, fixtureDef, vertices, 100, polyColl.offset.x, polyColl.offset.y); //必须放大100倍进行计算
for (j = 0; j < fixtures.Length; j++)
{
scaleShape(fixtures[j].GetShape());
}
fixtureList.AddRange(fixtures);
}
_fixtureDict[coll] = fixtureList.ToArray();
}
}
/**在编辑器更改碰撞器的形状Shape时*/
private void onEditShape(object[] args)
{
Collider2D collider = (Collider2D)args [0];
b2Fixture[] fixtures = _fixtureDict [collider];
if (collider is BoxCollider2D)
{
b2Fixture fixture = fixtures[0];
b2Shape s = fixture.GetShape();
float sizeX = (float)args [1];
float sizeY = (float)args [2];
BoxCollider2D boxColl = collider as BoxCollider2D;
b2PolygonShape polygon = s as b2PolygonShape;
polygon.SetAsOrientedBox(sizeX * 0.5f, sizeY * 0.5f, new b2Vec2(boxColl.offset.x, boxColl.offset.y), 0);
scaleShape(polygon);
_body.SetAwake(true);
}
else if (collider is PolygonCollider2D)
{
Vector2[] points = (Vector2[])args[1];
int len = points.Length;
b2Vec2[] vertices = new b2Vec2[len];
for (int i = 0; i < len; i++)
{
vertices[i] = new b2Vec2(points[i].x, points[i].y);
}
b2FixtureDef fixtureDef = new b2FixtureDef();
fixtureDef.density = fixtures[0].GetDensity();
fixtureDef.friction = fixtures[0].GetFriction();
fixtureDef.isSensor = fixtures[0].IsSensor();
fixtureDef.restitution = fixtures[0].GetRestitution();
int j = fixtures.Length;
while (--j >= 0)
{
_body.DestroyFixture(fixtures[j]);
}
b2Separator sep = new b2Separator();
_fixtureDict [collider] = sep.Separate(_body, fixtureDef, vertices, 1);
fixtures = _fixtureDict [collider];
for (j = 0; j < fixtures.Length; j++)
{
scaleShape(fixtures[j].GetShape());
}
_body.SetAwake(true);
}
else if (collider is CircleCollider2D)
{
b2Fixture fixture = fixtures[0];
float radius = (float)args[1];
float cx = (float)args[2];
float cy = (float)args[3];
b2Shape s = fixture.GetShape();
b2CircleShape circle = s as b2CircleShape;
circle.SetRadius(radius);
circle.SetLocalPosition(new b2Vec2(cx, cy));
scaleShape(circle);
_body.SetAwake(true);
}
}