检测碰撞方向 [英] Detecting the Direction of a Collision

问题描述

一个正方形瓷砖与另一个正方形瓷砖碰撞。酒保说...

A square tile collides with another square tile. The bartender says...

我有：

• 高度，宽度


• 引起碰撞的运动的二维矢量。

我需要从哪个侧面知道发生了碰撞（例如，顶部，底部，左侧，右侧），以便适当地重置位置。

I need to know from what SIDE the collision occurred (e.g. top, bottom, left, right) in order to reset the location appropriately.

我将给出对任何人都可以回答这个问题的心理cookie，因为我已经尝试了很多小时，这似乎很重要。

I will give a mental cookie to whoever can answer this question, because I've been trying for too many hours and this seems fundamental.

推荐答案

float player_bottom = player.get_y() + player.get_height();
float tiles_bottom = tiles.get_y() + tiles.get_height();
float player_right = player.get_x() + player.get_width();
float tiles_right = tiles.get_x() + tiles.get_width();

float b_collision = tiles_bottom - player.get_y();
float t_collision = player_bottom - tiles.get_y();
float l_collision = player_right - tiles.get_x();
float r_collision = tiles_right - player.get_x();

if (t_collision < b_collision && t_collision < l_collision && t_collision < r_collision )
{                           
//Top collision
}
if (b_collision < t_collision && b_collision < l_collision && b_collision < r_collision)                        
{
//bottom collision
}
if (l_collision < r_collision && l_collision < t_collision && l_collision < b_collision)
{
//Left collision
}
if (r_collision < l_collision && r_collision < t_collision && r_collision < b_collision )
{
//Right collision
}

当对象位于另一个对象中时，这不能解决。但这确实适用于重叠

This doesn't solve when object is inside one of the other. But it does work with overlapping

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