Why does this function not work correctly with Create Animated Sprite?

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Stygian

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Posted: 2nd Mar 2010 00:50

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This is the function working properly:

+ Code Snippet

typewriter(10,125,"I didn't need an array.",10)  
typewriter(10,140,"Just a function that would call text, duh.",10)
typewriter(10,155,"Pretty sweet huh?.",10)



function typewriter(x#,y#,text$,speed)
   for a=1 to len(text$)   
      text x#,Y#,left$(text$,a) 
      wait speed 
   next a   
 wait 500 
endfunction

And now it doesn't work:

+ Code Snippet

create animated sprite 1,"DoctorSprite.bmp",8,2,1

typewriter(10,125,"I didn't need an array.",10)  
typewriter(10,140,"Just a function that would call text, duh.",10)
typewriter(10,155,"Pretty sweet huh?.",10)



function typewriter(x#,y#,text$,speed)
   for a=1 to len(text$)   
      text x#,Y#,left$(text$,a) 
      wait speed 
   next a   
 wait 500 
endfunction

The sprite works fine within the program, I have singled out this line of code as the problem, can anyone tell me why Create Animated Sprite is messing this function up?

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ShaunRW

DBPro Developer

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Location: Brisbane, Australia

Posted: 2nd Mar 2010 13:56

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This happens because when you create a sprite, DBPro switches from 2D mode to 3D mode. And when you use 3D you have to say when to render to the screen. You do this by using the Sync On command to turn on syncing. After that you can put Sync when ever you want to render to the screen.

So with your function you want to render to the screen after each letter was printed (At Bottom of the for-next loop).

Here's the code to show you what i mean:

+ Code Snippet

Sync On // <<<<< Added this
create animated sprite 1,"DoctorSprite.bmp",8,2,1


typewriter(10,125,"I didn't need an array.",10)  
typewriter(10,140,"Just a function that would call text, duh.",10)
typewriter(10,155,"Pretty sweet huh?.",10)

Wait Key : end

function typewriter(x#,y#,text$,speed)
	for a=1 to len(text$)   
    	text x#,y#,left$(text$,a) 
    	wait speed
 	  	Sync // <<<<< Added this
   	Next a   
 	wait 500 
endfunction

ShaunRWs Timer Plugin.

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Stygian

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Joined: 6th Jan 2010

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Posted: 3rd Mar 2010 10:34 Edited at: 3rd Mar 2010 10:35

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Actually, the entire program has syncs and they seem to work right, but I really wanted to know specifically what "3d mode" entailed, and how to avoid it if possible.

also, the second example does each line before it resets, not each letter. *shrug

Even with syncs it still behaves differently. For instance, I could display a background image, and then if I wanted to use a text command, it would delete the background image as soon as I did. So, everytime I want to add a line of text, or a new image on the screen, I have to re-display EVERYTHING I did previous. Is there just no way around this?

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IanM

Retired Moderator

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 3rd Mar 2010 19:53

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You can switch the backdrop off after loading the sprite: BACKDROP OFF

Or (possibly slightly more efficiently), set sprites to not clear the screen or save the background when they are drawn: SET SPRITE 1, 0, 1

Utility plug-ins collection (updated 02 Mar 2010) and
http://www.matrix1.demon.co.uk

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Stygian

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Posted: 10th Mar 2010 00:43

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Thank you IanM, that worked perfectly. Also, my name is Ian Mackechney... so your name for the forums really confused the poop outa me for a second.

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