sprite not showing up - GameCreators Forum

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lovecraft58

9

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Joined: 30th Nov 2014

Location: United States

Posted: 3rd Feb 2015 19:45

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Can anyone tell me why the arrowtrans.bmp isn't showing up? This is from "Hands On DBPro".

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REM *** Set screen resolution ***
SET DISPLAY MODE 1280,1024,32

REM *** Load large image as background ***
LOAD IMAGE “background1.bmp”,2
SPRITE 1001,0,0,2

REM *** Create first sprite ***
LOAD IMAGE “arrowtrans.bmp”,1
SPRITE 1,600,500,1
LOAD IMAGE “tree.bmp”,3
SPRITE 501,100,250,3

REM *** Move arrow past tree ***
FOR x = 600 TO 50 STEP -10
    SPRITE 1,x,500,1
    WAIT 20
NEXT x

REM *** End program ***
WAIT KEY
END

Nick Z.

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TheComet

17

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Joined: 18th Oct 2007

Location: I`m under ur bridge eating ur goatz.

Posted: 3rd Feb 2015 22:01

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Does it show up if you do this?

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SET DISPLAY MODE 1280,1024,32

LOAD IMAGE “arrowtrans.bmp”,1
SPRITE 1,600,500,1

WAIT KEY
END

The only way to do great work is to love what you do -- Steve Jobs

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WickedX

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 4th Feb 2015 02:42 Edited at: 4th Feb 2015 02:44

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The two things I notice right off the bat, is improper sprite priority and the fact that a for/next loop does not update the display.

By default DarkBasic Professional will draw the sprite with the lowest image number first. So, a sprite using a higher image number will be displayed on top of a sprite with a lower image number. You can use Set Sprite Priority to change this behavior.

Whether sync or the backdrop is on or off, DBPro still uses double buffering. In you code rendering the sprite will turn the backdrop on but, you are still not using sync. Under this condition certain other functions will flip the backbuffer. A for/next loop will not do this. However, if changed to a while/endwhile loop the backbuffer will get displayed.

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x = 600
while x>49
    SPRITE 600,x,500,3
    dec x, 10
    WAIT 20
endwhile

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WickedX

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Posted: 4th Feb 2015 03:17 Edited at: 4th Feb 2015 03:19

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Disregard the second part of that post. It would appear a for/next loop updates the display as well.

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lovecraft58

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Joined: 30th Nov 2014

Location: United States

Posted: 4th Feb 2015 06:29

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TheComet, yes it does. It also works without the background, so the background is the problem?

Nick Z.

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pcRaider

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Joined: 30th May 2007

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Posted: 4th Feb 2015 07:10 Edited at: 4th Feb 2015 07:12

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test code
set sprite priority 1,100

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REM *** Set screen resolution ***
SET DISPLAY MODE 640,480,32
SET TEXT OPAQUE

ink rgb(255,255,255),rgb(255,0,0),
cls rgb(255,0,0)
print "background1.bmp"
get image 2, 0,0,400,400
save IMAGE "background1.bmp",2

ink rgb(255,255,255),rgb(0,255,0)
cls rgb(0,255,0)
print "arrowtrans.bmp"
get image 1, 0,0,50,50
save IMAGE "arrowtrans.bmp",1

ink rgb(255,255,255),rgb(0,0,255)
cls rgb(0,0,255)
print "tree.bmp"
get image 3, 0,0,100,100
save IMAGE "tree.bmp",3


cls
REM *** Load large image as background ***
LOAD IMAGE "background1.bmp",2
SPRITE 1001,0,0,2
set sprite priority 1001,1

REM *** Create first sprite ***
LOAD IMAGE "tree.bmp",3
SPRITE 501,100,250,3
set sprite priority 501,10

LOAD IMAGE "arrowtrans.bmp",1
SPRITE 1,600,500,1
set sprite priority 1,100

REM *** Move arrow past tree ***
FOR x = 600 TO 50 STEP -10
    SPRITE 1,x,300,1
    WAIT 200
NEXT x

REM *** End program ***
WAIT KEY
END

windowsXp

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WickedX

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 4th Feb 2015 13:38

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The problem is not the background. It's that the background is using a higher image number then the arrow.

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lovecraft58

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Joined: 30th Nov 2014

Location: United States

Posted: 4th Feb 2015 15:13

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Thank you all. Now I understand.

Nick Z.

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