/**
* Separates a non-convex polygon into convex polygons and adds them as fixtures to the <code>body</code> parameter.<br/>
* There are some rules you should follow (otherwise you might get unexpected results) :
* <ul>
* <li>This class is specifically for non-convex polygons. If you want to create a convex polygon, you don't need to use this class - Box2D's <code>b2PolygonShape</code> class allows you to create convex shapes with the <code>setAsArray()</code>/<code>setAsVector()</code> method.</li>
* <li>The vertices must be in clockwise order.</li>
* <li>No three neighbouring points should lie on the same line segment.</li>
* <li>There must be no overlapping segments and no "holes".</li>
* </ul> <p/>
* @param body The b2Body, in which the new fixtures will be stored.
* @param fixtureDef A b2FixtureDef, containing all the properties (friction, density, etc.) which the new fixtures will inherit.
* @param verticesVec The vertices of the non-convex polygon, in clockwise order.
* @param scale <code>[optional]</code> The scale which you use to draw shapes in Box2D. The bigger the scale, the better the precision. The default value is 30.
* @see b2PolygonShape
* @see b2PolygonShape.SetAsArray()
* @see b2PolygonShape.SetAsVector()
* @see b2Fixture
* */
public b2Fixture[] Separate(b2Body body, b2FixtureDef fixtureDef, b2Vec2[] verticesVec, float scale = 100, float offsetX = 0, float offsetY = 0)
{
int i;
int n = verticesVec.Length;
int j;
int m;
List <b2Vec2> vec = new List <b2Vec2>();
ArrayList figsVec;
b2PolygonShape polyShape;
for (i = 0; i < n; i++)
{
vec.Add(new b2Vec2((verticesVec[i].x + offsetX) * scale, (verticesVec[i].y + offsetY) * scale));
}
if (!getIsConvexPolygon(vec, vec.Count))
{
int validate = Validate(vec);
if (validate == 2 || validate == 3)
{
vec.Reverse(); //add by kingBook 2017.2.14
}
}
//Debug.Log(string.Format("Validate:{0}",Validate(vec)));
figsVec = calcShapes(vec);
n = figsVec.Count;
b2Fixture[] fixtures = new b2Fixture[n];
for (i = 0; i < n; i++)
{
vec = (List <b2Vec2>)figsVec[i];
vec.Reverse();//add by kingBook 2017.2.14
m = vec.Count;
verticesVec = new b2Vec2[m];
for (j = 0; j < m; j++)
{
verticesVec[j] = new b2Vec2(vec[j].x / scale, vec[j].y / scale);
}
polyShape = new b2PolygonShape();
polyShape.SetAsArray(verticesVec, m);
fixtureDef.shape = polyShape;
fixtures[i] = body.CreateFixture(fixtureDef);
}
return(fixtures);
}