public void ShatterCell(cpPolyShape shape, cpVect cell, int cell_i, int cell_j, ref WorleyContex context)
{
// printf("cell %dx%d: (% 5.2f, % 5.2f)\n", cell_i, cell_j, cell.x, cell.y);
cpBody body = shape.body; // cpShapeGetBody(shape);
cpVect[] ping = new cpVect[MAX_VERTEXES_PER_VORONOI]; // cpVect[ (cpVect*)alloca( * sizeof(cpVect));
cpVect[] pong = new cpVect[MAX_VERTEXES_PER_VORONOI]; //(cpVect*)alloca(MAX_VERTEXES_PER_VORONOI * sizeof(cpVect));
int count = shape.Count; // cpPolyShapeGetCount();
count = (count > MAX_VERTEXES_PER_VORONOI ? MAX_VERTEXES_PER_VORONOI : count);
for (int i = 0; i < count; i++)
{
ping[i] = body.LocalToWorld(shape.GetVert(i));
}
cpPointQueryInfo info = null;
for (int i = 0; i < context.width; i++)
{
for (int j = 0; j < context.height; j++)
{
if (
!(i == cell_i && j == cell_j) &&
shape.PointQuery(cell, ref info) < 0
)
{
count = ClipCell(shape, cell, i, j, context, ping, pong, count);
for (int u = 0; u < pong.Length; u++)
{
if (pong[u] != null)
{
ping[u] = new cpVect(pong[u]);
}
}
}
}
}
cpVect centroid = cp.CentroidForPoly(count, ping);
float mass = cp.AreaForPoly(count, ping, 0) * DENSITY;
float moment = cp.MomentForPoly(mass, count, ping, cpVect.cpvneg(centroid), 0);
cpBody new_body = space.AddBody(new cpBody(mass, moment));
new_body.SetPosition(centroid);
new_body.SetPosition(centroid);
new_body.SetVelocity(body.GetVelocityAtLocalPoint(centroid));
new_body.SetAngularVelocity(body.GetAngularVelocity());
cpTransform transform = cpTransform.Translate(cpVect.cpvneg(centroid));
cpShape new_shape = space.AddShape(new cpPolyShape(new_body, count, ping, transform, 0));
// Copy whatever properties you have set on the original shape that are important
new_shape.SetFriction(shape.GetFriction());
}
static public cpSpace BouncyTerrainCircles_500(cpSpace space)
{
//cpSpace space = BENCH_SPACE_NEW();
SetSubTitle("BouncyTerrainCircles 500");
space.SetIterations(10);
cpVect offset = new cpVect(-320, -240);
for (int i = 0; i < (bouncy_terrain_verts.Length - 1); i++)
{
cpVect a = bouncy_terrain_verts[i], b = bouncy_terrain_verts[i + 1];
cpShape shape = space.AddShape(new cpSegmentShape(space.GetStaticBody(), cpVect.cpvadd(a, offset), cpVect.cpvadd(b, offset), 0.0f));
shape.SetElasticity(1.0f);
}
for (int i = 0; i < 500; i++)
{
float radius = 5.0f;
float mass = radius * radius;
cpBody body = space.AddBody(new cpBody(mass, cp.MomentForCircle(mass, 0.0f, radius, cpVect.Zero)));
body.SetPosition(cpVect.cpvadd(cpVect.cpvmult(cp.frand_unit_circle(), 130.0f), cpVect.Zero));
body.SetVelocity(cpVect.cpvmult(cp.frand_unit_circle(), 50.0f));
cpShape shape = space.AddShape(new cpCircleShape(body, radius, cpVect.Zero));
shape.SetElasticity(1.0f);
}
return(space);
}
public void ClipPoly(cpSpace space, cpShape shp, cpVect n, float dist)
{
cpPolyShape shape = (cpPolyShape)shp;
cpBody body = shape.GetBody();
int count = shape.Count;
int clippedCount = 0;
cpVect[] clipped = new cpVect[count + 1];
for (int i = 0, j = count - 1; i < count; j = i, i++)
{
cpVect a = body.LocalToWorld(shape.GetVert(j));
float a_dist = cpVect.cpvdot(a, n) - dist;
if (a_dist < 0)
{
clipped[clippedCount] = a;
clippedCount++;
}
cpVect b = body.LocalToWorld(shape.GetVert(i));
float b_dist = cpVect.cpvdot(b, n) - dist;
if (a_dist * b_dist < 0)
{
float t = cp.cpfabs(a_dist) / (cp.cpfabs(a_dist) + cp.cpfabs(b_dist));
clipped[clippedCount] = cpVect.cpvlerp(a, b, t);
clippedCount++;
}
}
cpVect centroid = cp.CentroidForPoly(clippedCount, clipped);
float mass = cp.AreaForPoly(clippedCount, clipped, 0) * DENSITY;
float moment = cp.MomentForPoly(mass, clippedCount, clipped, cpVect.cpvneg(centroid), 0);
cpBody new_body = space.AddBody(new cpBody(mass, moment));
new_body.SetPosition(centroid);
new_body.SetVelocity(body.GetVelocityAtWorldPoint(centroid));
new_body.SetAngularVelocity(body.GetAngularVelocity());
cpTransform transform = cpTransform.Translate(cpVect.cpvneg(centroid));
cpShape new_shape = space.AddShape(new cpPolyShape(new_body, clippedCount, clipped, transform, 0));
// Copy whatever properties you have set on the original shape that are important
new_shape.SetFriction(shape.GetFriction());
}
static cpSpace NoCollide(cpSpace space)
{
space.SetIterations(10);
var handler = space.AddCollisionHandler(2, 2);
//, (a, s, o) => NoCollide_begin(a, s, o), null, null, null);
handler.beginFunc = NoCollide_begin;
float radius = 4.5f;
var staticBody = space.GetStaticBody();
space.AddShape(new cpSegmentShape(staticBody, new cpVect(-330 - radius, -250 - radius), new cpVect(330 + radius, -250 - radius), 0.0f)).SetElasticity(1.0f);
space.AddShape(new cpSegmentShape(staticBody, new cpVect(330 + radius, 250 + radius), new cpVect(330 + radius, -250 - radius), 0.0f)).SetElasticity(1.0f);
space.AddShape(new cpSegmentShape(staticBody, new cpVect(330 + radius, 250 + radius), new cpVect(-330 - radius, 250 + radius), 0.0f)).SetElasticity(1.0f);
space.AddShape(new cpSegmentShape(staticBody, new cpVect(-330 - radius, -250 - radius), new cpVect(-330 - radius, 250 + radius), 0.0f)).SetElasticity(1.0f);
for (int x = -320; x <= 320; x += 20)
{
for (int y = -240; y <= 240; y += 20)
{
space.AddShape(new cpCircleShape(staticBody, radius, new cpVect(x, y)));
}
}
for (int y = 10 - 240; y <= 240; y += 40)
{
float mass = 7.0f;
cpBody body = space.AddBody(new cpBody(mass, cp.MomentForCircle(mass, 0.0f, radius, cpVect.Zero)));
body.SetPosition(new cpVect(-320.0f, y));
body.SetVelocity(new cpVect(100.0f, 0.0f));
cpShape shape = space.AddShape(new cpCircleShape(body, radius, cpVect.Zero));
shape.SetElasticity(1.0f);
shape.SetCollisionType(2);
}
for (int x = 30 - 320; x <= 320; x += 40)
{
float mass = 7.0f;
cpBody body = space.AddBody(new cpBody(mass, cp.MomentForCircle(mass, 0.0f, radius, cpVect.Zero)));
body.SetPosition(new cpVect(x, -240.0f));
body.SetVelocity(new cpVect(0.0f, 100.0f));
cpShape shape = space.AddShape(new cpCircleShape(body, radius, cpVect.Zero));
shape.SetElasticity(1.0f);
shape.SetCollisionType(2);
}
return(space);
}
void add_box()
{
const float size = 10;
const float mass = 1;
cpVect[] verts = new cpVect[] {
new cpVect(-size, -size),
new cpVect(-size, size),
new cpVect(size, size),
new cpVect(size, -size)
};
float radius = cpVect.cpvlength(new cpVect(size, size));
cpVect pos = rand_pos(radius);
cpBody body = space.AddBody(new cpBody(mass, cp.MomentForPoly(mass, 4, verts, cpVect.Zero, 0.0f)));
body.SetVelocityUpdateFunc(
(s, f1, f2) => planetGravityVelocityFunc(body, s, f1, f2)
);
body.SetPosition(pos);
// Set the box's velocity to put it into a circular orbit from its
// starting position.
float r = cpVect.cpvlength(pos);
float v = cp.cpfsqrt(gravityStrength / r) / r;
body.SetVelocity(cpVect.cpvmult(cpVect.cpvperp(pos), v));
// Set the box's angular velocity to match its orbital period and
// align its initial angle with its position.
body.SetAngularVelocity(v);
body.SetAngle(cp.cpfatan2(pos.y, pos.x));
cpShape shape = space.AddShape(new cpPolyShape(body, 4, verts, cpTransform.Identity, 0.0f)); //cpTransformIdentity
shape.SetElasticity(0);
shape.SetFriction(0.7f);
}
static public cpSpace BouncyTerrainHexagons_500(cpSpace space)
{
SetSubTitle("BouncyTerrainHexagons 500");
//cpSpace space = BENCH_SPACE_NEW();
space.SetIterations(10);
cpVect offset = new cpVect(-320, -240);
for (int i = 0; i < (bouncy_terrain_verts.Length - 1); i++)
{
cpVect a = bouncy_terrain_verts[i], b = bouncy_terrain_verts[i + 1];
cpShape shape = space.AddShape(new cpSegmentShape(space.GetStaticBody(), cpVect.cpvadd(a, offset), cpVect.cpvadd(b, offset), 0.0f));
shape.SetElasticity(1.0f);
}
float radius = 5.0f;
cpVect[] hexagon = new cpVect[6];
for (int i = 0; i < 6; i++)
{
float angle = -(float)Math.PI * 2.0f * i / 6.0f;
hexagon[i] = cpVect.cpvmult(cpVect.cpv(cp.cpfcos(angle), cp.cpfsin(angle)), radius - bevel);
}
for (int i = 0; i < 500; i++)
{
float mass = radius * radius;
cpBody body = space.AddBody(new cpBody(mass, cp.MomentForPoly(mass, 6, hexagon, cpVect.Zero, 0.0f)));
body.SetPosition(cpVect.cpvadd(cpVect.cpvmult(cp.frand_unit_circle(), 130.0f), cpVect.Zero));
body.SetVelocity(cpVect.cpvmult(cp.frand_unit_circle(), 50.0f));
cpShape shape = space.AddShape(new cpPolyShape(body, 6, hexagon, cpTransform.Identity, bevel));
shape.SetElasticity(1.0f);
}
return(space);
}
public override void Update(float dt)
{
base.Update(dt);
float coef = (2.0f + ChipmunkDemoKeyboard.y) / 3.0f;
float rate = ChipmunkDemoKeyboard.x * 30.0f * coef;
motor.SetRate(rate);
motor.SetMaxForce(rate > 0 ? 1000000.0f : 0.0f);
space.Step(dt);
for (int i = 0; i < numBalls; i++)
{
cpBody ball = balls[i];
cpVect pos = ball.GetPosition();
if (pos.x > 320.0f)
{
ball.SetVelocity(cpVect.Zero);
ball.SetPosition(new cpVect(-224.0f, 200.0f));
}
}
}
public override void OnEnter()
{
base.OnEnter();
space.SetIterations(30);
space.SetGravity(new cpVect(0, -500));
space.SetSleepTimeThreshold(0.5f);
space.SetCollisionSlop(0.5f);
var staticBody = space.GetStaticBody();
// Create segments around the edge of the screen.
var shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(-320, -240), new cpVect(-320, 240), 0.0f));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(320, -240), new cpVect(320, 240), 0.0f));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(-320, -240), new cpVect(320, -240), 0.0f));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(-320, 240), new cpVect(320, 240), 0.0f));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
{
// Add the edges of the bucket
var bb = new cpBB(-300, -200, 100, 0);
var radius = 5.0f;
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(bb.l, bb.b), new cpVect(bb.l, bb.t), radius));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(bb.r, bb.b), new cpVect(bb.r, bb.t), radius));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
shape = space.AddShape(new cpSegmentShape(staticBody, new cpVect(bb.l, bb.b), new cpVect(bb.r, bb.b), radius));
shape.SetElasticity(1.0f);
shape.SetFriction(1.0f);
shape.SetFilter(NOT_GRABBABLE_FILTER);
// Add the sensor for the water.
shape = space.AddShape(cpPolyShape.BoxShape2(staticBody, bb, 0.0f));
shape.SetSensor(true);
shape.SetCollisionType(1);
}
{
float width = 200.0f;
float height = 50.0f;
float mass = 0.3f * FLUID_DENSITY * width * height;
var moment = cp.MomentForBox(mass, width, height);
cpBody body = space.AddBody(new cpBody(mass, moment));
body.SetPosition(new cpVect(-50, -100));
body.SetVelocity(new cpVect(0, -100));
body.SetAngularVelocity(1);
shape = space.AddShape(cpPolyShape.BoxShape(body, width, height, 0.0f));
shape.SetFriction(0.8f);
}
{
float width = 40.0f;
float height = width * 2;
float mass = 0.3f * FLUID_DENSITY * width * height;
float moment = cp.MomentForBox(mass, width, height);
cpBody body = space.AddBody(new cpBody(mass, moment));
body.SetPosition(new cpVect(-200, -50));
body.SetVelocity(new cpVect(0, -100));
body.SetAngularVelocity(1);
shape = space.AddShape(cpPolyShape.BoxShape(body, width, height, 0.0f));
shape.SetFriction(0.8f);
}
cpCollisionHandler handler = space.AddCollisionHandler(1, 0);
handler.preSolveFunc = waterPreSolve;
Schedule();
}