need help with the math in a rule for a health sprite

rab127

Hi

I have ten sprites of a green sphere that represents a players health. Frame 0 100% of sphere visible, frame 10 100% of the sphere in invisible, Frame 5 the top half of the sphere is cut off and so on.

So say when 20% of a players health is gone I want to display frame1
when 30% of a players health is gone I want to display frame 2

i tried a rule with

game.health = game.health*1
Change image to frame 1

worked fine but then I struggled

went
game.health is less than game.health*.8
change image to frame 2

and so on down to 0 but it never changes from the first image.

Anyone know what I am doing wrong?

tatiang

Game.health will never equal game.health*.8 (unless game.health is zero). This is like writing an equation x=x*.8

Attributes always contain the current value of the attribute. So as game.health changes, you can't compare it to its former value. You need to use two attributes for this.

You need a game.maxhealth value that you use to compare (e.g. game.health<game.maxhealth*.8). You can either set game.maxhealth to some number before the game starts or you can use a change attribute behavior to set game.maxhealth to game.health when the game begins.

tatiang

yes thanks that makes sense. Do you know what I would use if I want a particular frame to display for the range of say game.health Level*.61 to game Level*.8?

Unless you want to work with complex math formulas, you're best off doing:

When [ALL conditions] attribute game.health>=game.Level*.61 [AND] game.health<=game.Level*.8 --> [...]

rab127

yes thanks that makes sense. Do you know what I would use if I want a particular frame to display for the range of say game.health Level*.61 to game Level*.8?

rab127

Hi Again

Does anyone know what I would use if I want a particular frame to display for the range of say game.health Level*.61 to game Level*.8?

I have an 8 frame sprite that I want to change as the value of an attribute increase or decreases

What would the rule look like?

I"ve tried

first rule

game.health=game.health level
change image frame 0

works

then
game.health < or = game.health level*.81
change image frame 1

works

then
game.health < or = random(game health level*.6,game.health level*.8)
change image frame 2

doesn't change, stays on frame1

rab127

Hi Tshirt

thanks for getting back to me. I could but I am using this for an RPG styled health sphere where the two variable increase as the player levels up. I was thinking I'd like to use percentage ranges for the images so I could accomodate these level up increases.

so at 100% health frame 0
85% health to 99% frame 1
65% health to 84% frame 2

and so on

rab127

Yes thanks!! that works great.

tatiang

In case you want the math formula, here's a demo for an image change every 15%: https://www.dropbox.com/s/h19ft64atzqtkba/ImageByPercent DEMO.zip

I chose to use font based images, but you could just as easily substitute your own "1.png" "2.png" etc. images for your health meter.