Android build v1.1.15

src/modes/iwt2/sim/collision.ts

@@ -0,0 +1,46 @@
+import type { Iwt2ArenaBounds, Iwt2Circle, Iwt2Vec2 } from './types'
+import {
+  addVec2,
+  clamp,
+  clampVec2ToArena,
+  distanceVec2,
+  dotVec2,
+  lengthSqVec2,
+  normalizeVec2,
+  scaleVec2,
+  subtractVec2,
+} from './vector'
+
+export function circlesOverlap(a: Iwt2Circle, b: Iwt2Circle): boolean {
+  const radiusSum = a.radius + b.radius
+  return distanceVec2(a.position, b.position) <= radiusSum
+}
+
+export function distanceToSegment(point: Iwt2Vec2, start: Iwt2Vec2, end: Iwt2Vec2): number {
+  const segment = subtractVec2(end, start)
+  const segmentLengthSq = lengthSqVec2(segment)
+  if (segmentLengthSq <= 0.0001) return distanceVec2(point, start)
+  const pointOffset = subtractVec2(point, start)
+  const t = clamp(dotVec2(pointOffset, segment) / segmentLengthSq, 0, 1)
+  const projection = addVec2(start, scaleVec2(segment, t))
+  return distanceVec2(point, projection)
+}
+
+export function circleIntersectsSegment(
+  circle: Iwt2Circle,
+  start: Iwt2Vec2,
+  end: Iwt2Vec2,
+  width: number,
+): boolean {
+  return distanceToSegment(circle.position, start, end) <= circle.radius + width
+}
+
+export function separateCircles(moving: Iwt2Circle, fixed: Iwt2Circle, bounds: Iwt2ArenaBounds): Iwt2Vec2 {
+  const offset = subtractVec2(moving.position, fixed.position)
+  const minDistance = moving.radius + fixed.radius
+  const distanceSq = lengthSqVec2(offset)
+  if (distanceSq >= minDistance * minDistance) return moving.position
+  const direction = distanceSq <= 0.0001 ? { x: 1, y: 0 } : normalizeVec2(offset)
+  const resolved = addVec2(fixed.position, scaleVec2(direction, minDistance))
+  return clampVec2ToArena(resolved, moving.radius, bounds)
+}