C++如果位块传输到特定表面，则发生 SDL 碰撞
我有一个简单的游戏，其中包括 2 个将精灵传输到其上的表面。第一个是我将角色要跳过的小方块，第二个是我将角色精灵复制到的表面。我想进行碰撞检测，它只检测我的角色不在表面上的物体（如果这有意义的话）。所以本质上把它想象成两层，第一层有障碍，第二层有我的性格。我希望它只检测第一层上的障碍物精灵。有办法做到这一点吗？
I have a simple game that includes 2 surfaces that I blit sprites onto. One I blit little squares which your character is supposed to jump over, the second is the surface I blit my characters sprite onto. I want to make a collision detection where it only detects objects that are on the surface my character is NOT on if that makes sense. So essentially think of it like 2 layers, the first one has obstacles, the second has my character. I want it to only detect the sprites as obstacles on the first layer. Is there a way to do this?
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我想到的一种方法如下：
首先，将每层的对象分开，例如
std::vectorCharLayerObjects; （std::vector用于当该平面上有更多对象时，例如环境内容）和std::vectorCollisionLayerObjects； 。然后只需针对CollisionLayerObjects向量中的对象测试角色即可。当然，这仅在两个表面具有相同尺寸的情况下才有效，但我认为这是可以预料的。One approach that comes to mind is the following:
First, seperate the objects per layer, say
std::vector<MyObjects*> CharLayerObjects;(std::vectorfor when you have more objects on that plane, like environment stuff) andstd::vector<MyObjects*> CollisionLayerObjects;. Then just test the character against the objects in theCollisionLayerObjectsvector. Of course, this only works if both surfaces have the same dimensions, but I think that's to be expected.通常，碰撞检测是对抽象几何体而不是像素数据执行的，因此 SDL 不提供碰撞检测功能。如果您使用抽象表示（例如，正方形或圆形），那么您在何处位图传输曲面并不会真正对碰撞产生任何影响 - 您可以比较所需的任何对象，而不管哪些曲面已被位图传输到其他曲面。
Normally collision detection is performed on abstract geometry rather than pixel data, and as such SDL doesn't provide collision detection functionality. If you use the abstract representation (eg, a square or a circle) then where you blit your surfaces doesn't really make any difference to the collisions - you can compare whichever objects you want regardless of which surfaces have been blitted to other surfaces.