public CharacterCollision()
{
// Ground body
{
BodyDef bd = new BodyDef();
Body ground = m_world.CreateBody(bd);
EdgeShape shape = new EdgeShape();
shape.Set(new Vec2(-20.0f, 0.0f), new Vec2(20.0f, 0.0f));
shape.Density = 0;
ground.CreateFixture(shape);
}
// Collinear edges with no adjacency information.
// This shows the problematic case where a box shape can hit
// an internal vertex.
{
BodyDef bd = new BodyDef();
Body ground = m_world.CreateBody(bd);
EdgeShape shape = new EdgeShape();
shape.Density = 0;
shape.Set(new Vec2(-8.0f, 1.0f), new Vec2(-6.0f, 1.0f));
ground.CreateFixture(shape);
shape.Set(new Vec2(-6.0f, 1.0f), new Vec2(-4.0f, 1.0f));
ground.CreateFixture(shape);
shape.Set(new Vec2(-4.0f, 1.0f), new Vec2(-2.0f, 1.0f));
ground.CreateFixture(shape);
}
// Chain shape
{
BodyDef bd = new BodyDef();
bd.angle = 0.25f * (float)Math.PI;
Body ground = m_world.CreateBody(bd);
Vec2[] vs = new Vec2[4];
vs[0].Set(5.0f, 7.0f);
vs[1].Set(6.0f, 8.0f);
vs[2].Set(7.0f, 8.0f);
vs[3].Set(8.0f, 7.0f);
ChainShape shape = new ChainShape();
shape.CreateChain(vs, 4);
shape.Density = 0;
ground.CreateFixture(shape);
}
// Square tiles. This shows that adjacency shapes may
// have non-smooth collision. There is no solution
// to this problem.
{
BodyDef bd = new BodyDef();
Body ground = m_world.CreateBody(bd);
PolygonShape shape = new PolygonShape();
shape.Density = 0;
shape.SetAsBox(1.0f, 1.0f, new Vec2(4.0f, 3.0f), 0.0f);
ground.CreateFixture(shape);
shape.SetAsBox(1.0f, 1.0f, new Vec2(6.0f, 3.0f), 0.0f);
ground.CreateFixture(shape);
shape.SetAsBox(1.0f, 1.0f, new Vec2(8.0f, 3.0f), 0.0f);
ground.CreateFixture(shape);
}
// Square made from an edge loop. Collision should be smooth.
{
BodyDef bd = new BodyDef();
Body ground = m_world.CreateBody(bd);
Vec2[] vs = new Vec2[4];
vs[0].Set(-1.0f, 3.0f);
vs[1].Set(1.0f, 3.0f);
vs[2].Set(1.0f, 5.0f);
vs[3].Set(-1.0f, 5.0f);
ChainShape shape = new ChainShape();
shape.CreateLoop(vs, 4);
shape.Density = 0;
ground.CreateFixture(shape);
}
// Edge loop. Collision should be smooth.
{
BodyDef bd = new BodyDef();
bd.Position.Set(-10.0f, 4.0f);
Body ground = m_world.CreateBody(bd);
Vec2[] vs = new Vec2[10];
vs[0].Set(0.0f, 0.0f);
vs[1].Set(6.0f, 0.0f);
vs[2].Set(6.0f, 2.0f);
vs[3].Set(4.0f, 1.0f);
vs[4].Set(2.0f, 2.0f);
vs[5].Set(0.0f, 2.0f);
vs[6].Set(-2.0f, 2.0f);
vs[7].Set(-4.0f, 3.0f);
vs[8].Set(-6.0f, 2.0f);
vs[9].Set(-6.0f, 0.0f);
ChainShape shape = new ChainShape();
shape.CreateLoop(vs, 10);
shape.Density = 0;
ground.CreateFixture(shape);
}
// Square character 1
{
BodyDef bd = new BodyDef();
bd.Position.Set(-3.0f, 8.0f);
bd.type = BodyType._dynamicBody;
bd.fixedRotation = true;
bd.allowSleep = false;
Body body = m_world.CreateBody(bd);
PolygonShape shape = new PolygonShape();
shape.SetAsBox(0.5f, 0.5f);
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 20.0f;
body.CreateFixture(fd);
}
// Square character 2
{
BodyDef bd = new BodyDef();
bd.Position.Set(-5.0f, 5.0f);
bd.type = BodyType._dynamicBody;
bd.fixedRotation = true;
bd.allowSleep = false;
Body body = m_world.CreateBody(bd);
PolygonShape shape = new PolygonShape();
shape.SetAsBox(0.25f, 0.25f);
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 20.0f;
body.CreateFixture(fd);
}
// Hexagon character
{
BodyDef bd = new BodyDef();
bd.Position.Set(-5.0f, 8.0f);
bd.type = BodyType._dynamicBody;
bd.fixedRotation = true;
bd.allowSleep = false;
Body body = m_world.CreateBody(bd);
float angle = 0.0f;
float delta = (float)Math.PI / 3.0f;
Vec2[] vertices = new Vec2[6];
for (int i = 0; i < 6; ++i)
{
vertices[i].Set(0.5f * (float)Math.Cos(angle), 0.5f * (float)Math.Sin(angle));
angle += delta;
}
PolygonShape shape = new PolygonShape();
shape.Set(vertices, 6);
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 20.0f;
body.CreateFixture(fd);
}
// Circle character
{
BodyDef bd = new BodyDef();
bd.Position.Set(3.0f, 5.0f);
bd.type = BodyType._dynamicBody;
bd.fixedRotation = true;
bd.allowSleep = false;
Body body = m_world.CreateBody(bd);
CircleShape shape = new CircleShape();
shape.m_radius = 0.5f;
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 20.0f;
body.CreateFixture(fd);
}
// Circle character
{
BodyDef bd = new BodyDef();
bd.Position.Set(-7.0f, 6.0f);
bd.type = BodyType._dynamicBody;
bd.allowSleep = false;
m_character = m_world.CreateBody(bd);
CircleShape shape = new CircleShape();
shape.m_radius = 0.25f;
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 20.0f;
fd.friction = 1.0f;
m_character.CreateFixture(fd);
}
}
public Pinball()
{
// Ground body
Body ground = null;
{
BodyDef bd = new BodyDef();
ground = m_world.CreateBody(bd);
Vec2[] vs = new Vec2[5];
vs[0].Set(0.0f, -2.0f);
vs[1].Set(8.0f, 6.0f);
vs[2].Set(8.0f, 20.0f);
vs[3].Set(-8.0f, 20.0f);
vs[4].Set(-8.0f, 6.0f);
ChainShape loop = new ChainShape();
loop.CreateLoop(vs, 5);
FixtureDef fd = new FixtureDef();
fd.shape = loop;
fd.Density = 0.0f;
ground.CreateFixture(fd);
}
// Flippers
{
Vec2 p1 = new Vec2(-2.0f, 0.0f);
Vec2 p2 = new Vec2(2.0f, 0.0f);
BodyDef bd = new BodyDef();
bd.type = BodyType._dynamicBody;
bd.Position = p1;
Body leftFlipper = m_world.CreateBody(bd);
bd.Position = p2;
Body rightFlipper = m_world.CreateBody(bd);
PolygonShape box = new PolygonShape();
box.SetAsBox(1.75f, 0.1f);
FixtureDef fd = new FixtureDef();
fd.shape = box;
fd.Density = 1.0f;
leftFlipper.CreateFixture(fd);
rightFlipper.CreateFixture(fd);
RevoluteJointDef jd = new RevoluteJointDef();
jd.bodyA = ground;
jd.localAnchorB.SetZero();
jd.enableMotor = true;
jd.maxMotorTorque = 1000.0f;
jd.enableLimit = true;
jd.motorSpeed = 0.0f;
jd.localAnchorA = p1;
jd.bodyB = leftFlipper;
jd.lowerAngle = -30.0f * (float)Math.PI / 180.0f;
jd.upperAngle = 5.0f * (float)Math.PI / 180.0f;
m_leftJoint = (RevoluteJoint)m_world.CreateJoint(jd);
jd.motorSpeed = 0.0f;
jd.localAnchorA = p2;
jd.bodyB = rightFlipper;
jd.lowerAngle = -5.0f * (float)Math.PI / 180.0f;
jd.upperAngle = 30.0f * (float)Math.PI / 180.0f;
m_rightJoint = (RevoluteJoint)m_world.CreateJoint(jd);
}
// Circle character
{
BodyDef bd = new BodyDef();
bd.Position.Set(1.0f, 15.0f);
bd.type = BodyType._dynamicBody;
bd.bullet = true;
m_ball = m_world.CreateBody(bd);
CircleShape shape = new CircleShape();
shape.m_radius = 0.2f;
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.Density = 1.0f;
m_ball.CreateFixture(fd);
}
m_button = false;
}
private void DrawShape(Fixture fixture, Transform xf, Color color)
{
switch (fixture.GetShapeType())
{
case ShapeType.Circle:
{
CircleShape circle = (CircleShape)fixture.GetShape();
Vec2 center = Utilities.Mul(xf, circle.m_p);
float radius = circle.m_radius;
Vec2 axis = Utilities.Mul(xf.q, new Vec2(1.0f, 0.0f));
m_debugDraw.DrawSolidCircle(center, radius, axis, color);
}
break;
case ShapeType.Edge:
{
EdgeShape edge = (EdgeShape)fixture.GetShape();
Vec2 v1 = Utilities.Mul(xf, edge.m_vertex1);
Vec2 v2 = Utilities.Mul(xf, edge.m_vertex2);
m_debugDraw.DrawSegment(v1, v2, color);
}
break;
case ShapeType.Chain:
{
ChainShape chain = (ChainShape)fixture.GetShape();
int count = chain.m_count;
List <Vec2> vertices = chain.m_vertices;
Vec2 v1 = Utilities.Mul(xf, vertices[0]);
for (int i = 1; i < count; ++i)
{
Vec2 v2 = Utilities.Mul(xf, vertices[i]);
m_debugDraw.DrawSegment(v1, v2, color);
m_debugDraw.DrawCircle(v1, 0.05f, color);
v1 = v2;
}
}
break;
case ShapeType.Polygon:
{
PolygonShape poly = (PolygonShape)fixture.GetShape();
int vertexCount = poly.m_count;
Utilities.Assert(vertexCount <= Settings._maxPolygonVertices);
Vec2[] vertices = new Vec2[Settings._maxPolygonVertices];
for (int i = 0; i < vertexCount; ++i)
{
vertices[i] = Utilities.Mul(xf, poly.m_vertices[i]);
}
m_debugDraw.DrawSolidPolygon(vertices, vertexCount, color);
}
break;
default:
break;
}
}