how would i make a health bar - GameCreators Forum

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sskethan

15

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Joined: 20th Sep 2008

Location: Oshawa, ON. Canada

Posted: 5th Jan 2013 00:18

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I would like to create a bar below my player that increases and decreases.
This is the code i used to create it in DBP but i'm not sure how to do this in AGK. Is there a command to use like stretch?

+ Code Snippet


    if downkey() = 1 then dec player(0).cur_health, 1
    if player(0).cur_health < 0 then player(0).cur_health = 0
    if upkey() = 1 then inc player(0).cur_health, 1
    if player(0).cur_health > 100 then player(0).cur_health = player(0).max_health

    ch# = player(0).cur_health
    mh# = player(0).max_health
    scale_x# = (ch# / mh#) * 100

    sprite 102, player(0).px#-32, player(0).py#+32, 102
    stretch sprite 102, scale_x#, 100

    if keystate(12) = 1 then hide sprite 102
    if keystate(13) = 1 then show sprite 102

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xCept

21

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Joined: 15th Dec 2002

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Posted: 5th Jan 2013 00:26

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Use one of these commands instead to stretch/scale sprites in AGK:

SetSpriteScale( iSpriteIndex, x, y )

SetSpriteSize( iSpriteIndex, width, height )

(You can also use SetSpriteScaleByOffset(...) if you need to scale from a previously set offset.)

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sskethan

15

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Joined: 20th Sep 2008

Location: Oshawa, ON. Canada

Posted: 5th Jan 2013 05:38

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Thank you. Using setspritescale how would i decrease the health bar when there is a collision with an object. I was trying this but this seems to double the size of the sprite.

+ Code Snippet


rem load a health bar
createsprite ( 1000, 0 )
setspritesize ( 1000, 60, 5 )
setspriteposition ( 1000, 200, 100 )
setspritecolor( 1000, 0, 255, 0, 125 )

    if GetSpriteExists ( 202 )
        if GetSpriteCollision ( 1, 202 ) = 1
            setspritescale ( 1000, 50, 5 )
        endif
    endif

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xCept

21

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Joined: 15th Dec 2002

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Posted: 5th Jan 2013 07:02 Edited at: 5th Jan 2013 07:32

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The width and height values for SetSpriteScale are based on 1.0, not 100. So setspritescale ( 1000, 0.5, 1.0 ) will scale the sprite in half horizontally while retaining its original height. You can do the math as you please to ensure the percentage you need is on that 1.0 scale.

Or use SetSpriteSize() instead to use pixel values.

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lilpissywilly

AGK Developer

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Joined: 10th Sep 2010

Location: Office Chair

Posted: 5th Jan 2013 14:31 Edited at: 5th Jan 2013 14:34

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I guess I would do something like this, based on your example:

+ Code Snippet

rem load a health bar
createsprite ( 1000, 0 )
setspritesize ( 1000, 60, 5 )
setspriteposition ( 1000, 200, 100 )
setspritecolor( 1000, 0, 255, 0, 125 )

global health# = 1.0
global damage# = 0.1
// can take 10 hits before the meter is empty
// or bigger hits could reduce meter more, say - 0.3

    if GetSpriteExists ( 202 )
        if GetSpriteCollision ( 1, 202 ) = 1
            health# = health# - damage#
            if health# < 0.0 then health# = 0.0
            SetSpriteSize(1000, 60 * health#, 5)
        endif
    endif

Well, I probably wouldn't do that, but something similar. It's an idea anyway

My hovercraft is full of eels

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sskethan

15

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Joined: 20th Sep 2008

Location: Oshawa, ON. Canada

Posted: 7th Jan 2013 05:04

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Thank you both. Health bar is now working great. Everyone is so very helpful here. The game is coming along great.
http://www.youtube.com/watch?v=Oih6eJtExJY&feature=youtu.be
I'm having another problem now though. I have been able to figure out how to get the enemy to rotate and face the direction the player is.

+ Code Snippet

    if GetSpriteExists ( 500 )
        spriteraycast ( getspritexByOffset ( 1 ), getspriteyByOffset ( 1 ), getspritexByOffset ( 500 ), getspriteyByOffset ( 500 ) )
        rem Angle enemy to point at player
        xoffset# = GetRayCastX() - GetSpriteXByOffset ( 500 )
        yoffset# = GetRayCastY() - GetSpriteYByOffset ( 500 )

            rem Adjustment for angles outside -90 to +90
            if xoffset# < 0
                bias = 180
            else
                bias = 0
            endif

        enemyangle# = atan ( yoffset#/xoffset# ) + bias
        SetSpriteAngle ( 500, enemyangle# -90 )
    endif

But i'm having trouble working out how to make the enemy follow the player or move toward the player like a magnet.

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