rotate text by center - GameCreators Forum

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smallg

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18

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Joined: 8th Dec 2005

Location: steam

Posted: 20th Dec 2017 12:47

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I have some text i want to display in the middle of a sprite, this works fine when the sprite is not rotated but if i rotate the sprite the text gets positioned incorrectly due to the fact that text with a center alignment is the top center compared to sprite's being the actual center.
is there a quick way to work out the correct position of the middle of the sprite after it has been rotated so that text can be placed in the middle (would prefer to use text alignment 1 'middle' but can change if necessary)?

+ Code Snippet

SetVirtualResolution(768,1024)
obj = CreateSprite(0)
SetSpriteSize(obj,100,200)
SetSpritePositionByOffset(obj,386,512)
txt = CreateText("Text")
SetTextAlignment(txt,1)
SetTextSize(txt,80)
SetTextColor(txt,255,0,0,255)
SetTextPosition(txt,GetSpriteXByOffset(obj),GetSpriteYByOffset(obj)-(GetTextTotalHeight(txt)/2))

ang = 0
do
	if GetRawKeyReleased(27) then end 
	inc ang, 1
	SetSpriteAngle(obj,ang)
	SetTextAngle(txt,ang)
	sync()
loop

p.s. i know i can change the sprite's offset to match the text but this will mess up my positioning and moving code so i would prefer it if i can just position the text instead but if it's not
p.p.s. the sprite will rotate in both directions

life's one big game
spec= 4ghz, 16gb ram, AMD R9 2700 gpu

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BatVink

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21

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Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 20th Dec 2017 16:12

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Can you make the text and sprite one image?
You can paste both sprites and then getImage to create it.

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nonom

7

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Joined: 12th Nov 2017

Location: Picking mushrooms

Posted: 2nd Jan 2018 13:05

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@smallg did you meant this?

+ Code Snippet

SetVirtualResolution(768,1024)
obj = CreateSprite(0)
SetSpriteSize(obj,100,200)
SetSpriteOffset(obj, 70, 100)
SetSpritePosition(obj,GetDeviceWidth()/3,GetDeviceHeight()/2)
txt = CreateText("Text")
SetTextAlignment(txt,1)
SetTextSize(txt,40)
SetTextColor(txt,255,0,0,255)
SetTextPosition(txt,GetSpriteXByOffset(obj),GetSpriteYByOffset(obj)) //-(GetTextTotalHeight(txt))
ang = 0
do
    if GetRawKeyReleased(27) then end 
    
	inc ang, 1
	SetSpriteAngle(obj,ang)
	SetTextAngle(txt,ang + 90)
    Sync()
loop

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IronManhood

9

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Joined: 6th Feb 2015

Location: US

Posted: 2nd Jan 2018 16:41 Edited at: 2nd Jan 2018 17:35

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This isn't quite perfect but it works I think.

+ Code Snippet

global angle as float = 0
global x as float
global y as float

CreateText( 1, "Rotating Text" )
FixTextToScreen( 1, 1 )
SetTextAlignment( 1, 1 )
SetTextSize( 1, 40 )
x = GetVirtualWidth() * 0.5
y = GetVirtualHeight() * 0.5 - ( GetTextTotalHeight( 1 ) * 0.5 )
SetTextPosition( 1, x, y )

do
    
    inc angle, 6
    if angle > 359 then angle = 0
    
    centerTextByAngle( 1, x, y, angle )

    Sync()
loop


function centerTextByAngle( txtID, cx#, cy#, angle# )
	SetTextAngle( txtID, angle# )
	dx# = cos( angle# + 90 )
	dy# = sin( angle# + 90 )
	dist# = -( GetTextTotalHeight( txtID ) * 0.5 )
	SetTextPosition( txtID, cx# + ( dx# * dist# ), cy# + ( dy# * dist# ) )
endfunction

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smallg

Valued Member

18

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Joined: 8th Dec 2005

Location: steam

Posted: 2nd Jan 2018 20:01

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@nonom not quite, i wanted to keep the offset of the sprite in the center
@ironmanhood that works much better, thanks!

life's one big game
spec= 4ghz, 16gb ram, AMD R9 2700 gpu

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