Started to use DBPro and ran into syntax troubles...

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Darkhog

13

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Joined: 25th Nov 2012

Location: Mushroom Kingdom

Posted: 25th Nov 2012 21:25

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I've started to use DBPro today (Free version, though I'm saving money for paid one as I want to support such great guys like you) and I've tried to make simple pong as my learning game.
The code is:

+ Code Snippet

Rem Project: Pong
Rem Created: Sunday, November 25, 2012

Rem ***** Main Source File *****
set display mode 800,600,32
set window on
playerpaddle = 1
enemypaddle = 2
ball = 3
Rem ^^ sprite numbers for all things.
Load Bitmap "paddle.png",1
Load Bitmap "ball.png",2
set window title "Simple pong"
Sync On
sprite playerpaddle, 300,600-30,1
sprite enemypaddle, 300,0,1
sprite ball, 400-15,300-15,2
sync
Remstart
Main loop start here
remend

wait key

Unfortunately I get runtime error message "Runtime error 501: Image number illegal at line 15". This is first of the sprite lines.
From my understanding I am not allowed to use variables here. WTFirework?
Also why does your BASIC dialect not allow for inline comments using apostrophe character, like most BASIC dialects do? It is certainly easier to push ' than type REM.

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Kezzla

17

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Location: Where beer does flow and men chunder

Posted: 26th Nov 2012 06:50

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try load image rather than load bitmap.

you can still load a bitmap from load image.

I think loading a bitmap has more to do with the backdrop.

you can use a variable to load an image.

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TheComet

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Joined: 18th Oct 2007

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

Posted: 26th Nov 2012 09:42

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The command load bitmap will cause the image to be loaded into a "buffer", one could say. You cannot print it to the screen in this form. The command is helpful if you have an image like this:

Because as a bitmap, you can use the command get image to grab certain areas from the active bitmap (to change bitmaps you have to use set current bitmap). Here's a quick example of how you'd read in the above image:

+ Code Snippet

rem load sprite sheet
load bitmap "spritesheet.bmp"

rem total image is 512x512, there are 8x8 to get, each image is 64x64
imgCounter = 1
for x = 0 to 7
   for y = 0 to 7
      get image imgCounter , x*64 , y*64 , x*64+64, y*64+64
      inc imgCounter
   next y
next x

rem no need for bitmap any more
delete bitmap 1

So in your case, just replace load bitmap with load image.

TheComet

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Darkhog

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Joined: 25th Nov 2012

Location: Mushroom Kingdom

Posted: 26th Nov 2012 10:34

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Thank you both. Sorta figured it myself (before post was approved), but maybe it'll be useful for other people who run into same issue.

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Green Gandalf

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Joined: 3rd Jan 2005

Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 26th Nov 2012 12:19

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Quote: "Unfortunately I get runtime error message "Runtime error 501: Image number illegal at line 15". "

The reason for that is that you have loaded your image files as bitmaps not images so DBPro can't find images 1 and 2. DBPro makes a distinction between the two and bitmaps are often used when you want to process the image data in some way.

As Kezzla says, just use load image instead.

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