探测火焰发动机屏幕底部的碰撞？

Question

按照示例这里，是否有可能检测到与屏幕特定一侧(例如屏幕底部)的冲突？

颤振版本: 2.2.3

火焰版本:1.0.0-释放

onCollision方法的MyCollidable类

@override
  void onCollision(Set<Vector2> intersectionPoints, Collidable other) {
    if (other is ScreenCollidable) {
      _isWallHit = true;
      // Detect which side?
      return;
    }
  }

Answer 1

这方面没有内置的方法，但是您可以很容易地计算出您是在与使用游戏的大小发生碰撞，并将碰撞点转换为屏幕坐标(如果您不更改缩放级别或移动相机，则无需此步骤)。

代码应该是这样的：

class MyCollidable extends PositionComponent
    with Hitbox, Collidable, HasGameRef {
  
  ...

  void onCollision(Set<Vector2> intersectionPoints, Collidable other) {
    if (other is ScreenCollidable) {
      _isWallHit = true;
      final firstPoint = intersectionPoints.first;
      // If you don't move/zoom the camera this step can be skipped
      final screenPoint = gameRef.projectVector(firstPoint);
      final screenSize = gameRef.size;
      if (screenPoint.x == 0) {
        // Left wall (or one of the leftmost corners)
      } else if (screenPoint.y == 0) {
        // Top wall (or one of the upper corners)
      } else if (screenPoint.x == screenSize.x) {
        // Right wall (or one of the rightmost corners)
      } else if (screenPoint.y == screenSize.y) {
        // Bottom wall (or one of the bottom corners)
      }
      return;
    }
  }