Creating a knockback effect

Question

I'm fairly new to creating a 2D game in java and I'd love some help. I'm trying to create a sort of knock back effect the enemies have on you. So when you are touched by a enemy you will:

lose life
be knocked back a few pixels

I thought about saying something simple such as:

    if ((player.x & player.y) == (enemy.x & enemy.y)){  
        player.x += 8;
        player.y += 8;
    }

But seeing as this will only push you back with no hope of moving while being pushed, I didn't want to use it. Is there any simple, yet effective way for going about this?

If you can, adding a velocity component, and adding/subtracting to/from the velocity would help facilitate a more realistic knockback. — Pandacoder
– Pandacoder, Commented Dec 11, 2013 at 1:31
It could be my unfamiliarity with Java, but the conditional there looks dicey to me. I think what you want is "if(player.x == enemy.x && player.y == enemy.y)" The bitwise-and operators in the version you've shown could lead to some unexpected false positives. — DMGregory
– DMGregory ♦, Commented Dec 11, 2013 at 17:19

Shadows In Rain · Accepted Answer · 2013-12-11 09:30:39Z

Usually this is done by changing velocity.

If you simply change position, there is danger of stucking in walls (and other solid objects, including enemises) or falling/jumping through them (depends on your collision system and level design).

Also you need to configure friction and/or gravity accordingly, so player will not fly into open space after one kick.

If inertial sliding will be too smooth for you, some engines allowing to attach short-living constant-power pushing forces to objects.

Honestly, it is hard to answer without knowing anything about your physics engine and its capabilities.

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