Knockback?

ZoSo	Knockback? « on: August 18, 2012, 04:28:54 pm »
Reputation: +0/-0 Offline Gender: Posts: 448	I'm trying to add knock back to my engine so that when Link gets hit by an enemy or projectile, he gets pushed back 2 or 3 pixels. I have a terrible excuse for one implemented right now, but it's not accurate at all :/ Right now I only have 1 enemy in my engine, an octorock, and want Link to be pushed back when the rock hits him. I have this code in the rock object to detect what direction it should move: Code: [Select] `link_pos = point_direction(objOctorok.x,objOctorok.y,objLink.x+1,objLink.y+20)`This works great. I was using kind of the same method to figure out which direction Link should be knocked back, but it doesnt take into consideration negative x and y values :/ Help anyone? Logged
Reputation: +0/-0 Offline Gender: Posts: 448

Antidote >.>	Re: Knockback? « Reply #1 on: August 18, 2012, 04:55:08 pm »
In all seriousness who's serious? Reputation: +0/-0 Offline Gender: Posts: 1485	What you need is a normalized vector, I'm not sure how this would be done effectively in GM but I know it's possible. http://www.fundza.com/vectors/normalize/index.html Logged

Atrius	Re: Knockback? « Reply #2 on: August 18, 2012, 07:42:08 pm »
Fear my Blades Reputation: +3/-0 Offline Gender: Posts: 562	You've got his direction all that's left is to move him. Typically you would calculate the x and y components of your vector with cosine and negative sine respectively, but Game Maker provides simple functions for doing it as well. lengthdir_x(len,dir) lengthdir_y(len,dir) On another note, why are you adding 1 and 20 to the player's x and y values? If it's to adjust for his center things will be WAAY easier for you if you move the offsets on his sprites to his center point instead. That way his x and y values will already be at his center. Logged
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