cant load or draw an image

BlitzMax Forums/BlitzMax Beginners Area/cant load or draw an image

slenkar

(Posted 2007) [#1]

Ive tried every combination but it always says 'trying to access null object'
whenever I use drawimage

e.g.
Global bullet_image:timage=LoadImage:timage("bullet.bmp",MASKEDIMAGE)
DrawImage bullet_image,x,y

tonyg

(Posted 2007) [#2]

Global bullet_image:timage=LoadImage("bullet.bmp",MASKEDIMAGE)
DrawImage bullet_image,x,y

Retimer

(Posted 2007) [#3]

Have you declared graphics, and are you sure the image is located in the .bmx's directory?

also,

Global bullet_image:timage=LoadImage("bullet.bmp",MASKEDIMAGE)

would work, no need to add the :timage.

jhocking

(Posted 2007) [#4]

Declaring graphics is the biggie, I often have confusing errors because I accidentally used an image/drawing command before calling Graphics.

slenkar

(Posted 2007) [#5]

still getting the error message

Strict
Graphics 640, 480, 0

Global ship_image:timage=LoadImage("ship.bmp",MASKEDIMAGE)
Global bullet_image:timage=LoadImage("bullet.bmp",MASKEDIMAGE)
If bullet_image=Null
RuntimeError "image=null"
EndIf

While Not KeyDown(key_escape)
Cls
DrawImage (ship_image,300,300)

Flip
Wend
End

the image always equals NULL

also, I cant find the flag that makes the window NOT fullscreen

Czar Flavius

(Posted 2007) [#6]

Have you made sure the pictures exist :P

slenkar

(Posted 2007) [#7]

yeh they are 16bit bitmaps
in the same directory as the BMX file
is that the right kind of bitmap?

Dreamora

(Posted 2007) [#8]

no, it must be 24bit (altogether not per channel!) bmps

slenkar

(Posted 2007) [#9]

thanks!
it works now after i converted the images
argh-

GfK	(Posted 2007) [#10]

Windowed: Graphics 800,600[,0]
Fullscreen: Graphics 800,600,16 (or 32)

slenkar

(Posted 2007) [#11]

thanks, thats a bit confusing for a previous B3D user

GfK	(Posted 2007) [#12]

There are a lot of things that are confusing about Blitzmax if you've moved from BB3D, but you get used to it. Its all for the better.

I wonder how I ever managed to write anything in BB3D now.

jhocking

(Posted 2007) [#13]

I'm using both right now (finishing up a project in Blitz3D, using BlitzMax for all my new projects.) I was worried that I'd be confused using them both at the same time, but the only problem I have really is that I keep trying to use semicolons for comments in BlitzMax.