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use na::Point2;
use rapier2d::dynamics::{JointSet, RigidBodyBuilder, RigidBodySet};
use rapier2d::geometry::{ColliderBuilder, ColliderSet};
use rapier_testbed2d::Testbed;
pub fn init_world(testbed: &mut Testbed) {
/*
* World
*/
let mut bodies = RigidBodySet::new();
let mut colliders = ColliderSet::new();
let joints = JointSet::new();
/*
* Ground
*/
let ground_size = 100.0;
let ground_thickness = 1.0;
let rigid_body = RigidBodyBuilder::new_static().build();
let ground_handle = bodies.insert(rigid_body);
let collider = ColliderBuilder::cuboid(ground_size, ground_thickness).build();
colliders.insert(collider, ground_handle, &mut bodies);
/*
* Create the cubes
*/
let num = 100;
let rad = 0.5;
let shift = rad * 2.0;
let centerx = shift * (num as f32) / 2.0;
let centery = shift / 2.0 + ground_thickness + rad * 1.5;
for i in 0usize..num {
for j in i..num {
let fj = j as f32;
let fi = i as f32;
let x = (fi * shift / 2.0) + (fj - fi) * shift - centerx;
let y = fi * shift + centery;
// Build the rigid body.
let rigid_body = RigidBodyBuilder::new_dynamic().translation(x, y).build();
let handle = bodies.insert(rigid_body);
let collider = ColliderBuilder::cuboid(rad, rad).build();
colliders.insert(collider, handle, &mut bodies);
}
}
/*
* Set up the testbed.
*/
testbed.set_world(bodies, colliders, joints);
testbed.look_at(Point2::new(0.0, 2.5), 5.0);
}
fn main() {
let testbed = Testbed::from_builders(0, vec![("Balls", init_world)]);
testbed.run()
}
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