How do I make a heath bar that locked on the right side and decrease from left side?

OrvilFox

I found out a video talking about health bar:
Which technically just construct the X value to the centre.
But it could only works when it locked on the left side and decrease from right side.
Then how do I make a heath bar that locked on the right side and decrease from left side?

Spalding004

Typically the way you would make a health bar like that would be to constrain its X position to

(where you want it centered)-(the width of the bar)*(1/2)

Or, you can make it easy on yourself and use a replicate behavior on a small actor like this:

number of copies: (health attribute)
replicate direction: left

so when you have full health, the the bar is a certain length and as health decreases it dynamically shrinks.

Or, if you wanted the bar to only be a certain length, under # of copies you could use this expression:

(current health of character/full health of character)*(max width you want for the bar)

which would result in a health bar of whatever length you wanted.

I'm assuming here a 1px wide actor. If you wanted a thicker actor for whatever reason you'd need to adjust the expression a bit.

jamie_c

I have a drop dead simple health bar tutorial below. It uses the Replicate Behavior so you can change the direction really easily.

OrvilFox

@jamie_c said:
I have a drop dead simple health bar tutorial below. It uses the Replicate Behavior so you can change the direction really easily.

I see. But is this way you provided has a lack of performance? Replicate in 1 pixel sounds..A lot of works to do for the engine.

OrvilFox

@Spalding004 said:
Typically the way you would make a health bar like that would be to constrain its X position to

(where you want it centered)-(the width of the bar)*(1/2)

Or, you can make it easy on yourself and use a replicate behavior on a small actor like this:

number of copies: (health attribute)
replicate direction: left

so when you have full health, the the bar is a certain length and as health decreases it dynamically shrinks.

Or, if you wanted the bar to only be a certain length, under # of copies you could use this expression:

(current health of character/full health of character)*(max width you want for the bar)

which would result in a health bar of whatever length you wanted.

I'm assuming here a 1px wide actor. If you wanted a thicker actor for whatever reason you'd need to adjust the expression a bit.

I see..But I guess using this method will be adjusted by the device resolution? Some device might have 1000 pixel but some might have 5000... will this still work?

jamie_c

Replicate works super fast, I wouldn't worry about any kind of performace hit. Its easy enough to incorporate, try it out and see.

MentalDonkeyGames

Replicate is super light on the engine.