chore: 添加第三方依赖库

thirdparty/rapier.js/testbed2d/src/demos/polyline.ts

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+import type {Testbed} from "../Testbed";
+
+type RAPIER_API = typeof import("@dimforge/rapier2d");
+
+export function initWorld(RAPIER: RAPIER_API, testbed: Testbed) {
+    let gravity = new RAPIER.Vector2(0.0, -9.81);
+    let world = new RAPIER.World(gravity);
+    let i, j;
+
+    /*
+     * Ground
+     */
+    let nsubdivs = 100;
+    let points = [];
+    let groundSize = 30.0;
+    let stepSize = groundSize / nsubdivs;
+
+    points.push(-groundSize / 2.0, 25.0);
+    for (i = 1; i < nsubdivs; ++i) {
+        let x = -groundSize / 2.0 + i * stepSize;
+        let y = Math.cos(i * stepSize) * 2.0;
+        points.push(x, y);
+    }
+    points.push(groundSize / 2.0, 25.0);
+    let bodyDesc = RAPIER.RigidBodyDesc.fixed();
+    let body = world.createRigidBody(bodyDesc);
+    let colliderDesc = RAPIER.ColliderDesc.polyline(new Float32Array(points));
+    world.createCollider(colliderDesc, body);
+
+    /*
+     * Create the cubes
+     */
+    let num = 10;
+    let rad = 0.5;
+
+    let shift = rad * 2.0;
+    let centerx = shift * (num / 2);
+    let centery = shift / 2.0;
+
+    for (i = 0; i < num; ++i) {
+        for (j = 0; j < num * 5; ++j) {
+            let x = i * shift - centerx;
+            let y = j * shift + centery + 3.0;
+
+            // Build the rigid body.
+            let bodyDesc = RAPIER.RigidBodyDesc.dynamic().setTranslation(x, y);
+            let body = world.createRigidBody(bodyDesc);
+
+            if (j % 2 == 0) {
+                let colliderDesc = RAPIER.ColliderDesc.cuboid(rad, rad);
+                world.createCollider(colliderDesc, body);
+            } else {
+                let colliderDesc = RAPIER.ColliderDesc.ball(rad);
+                world.createCollider(colliderDesc, body);
+            }
+        }
+    }
+
+    testbed.setWorld(world);
+    testbed.lookAt({
+        target: {x: -10.0, y: -15.0},
+        zoom: 10.0,
+    });
+}