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Hey everyone,

I'm reading through the Beginners Guide to DarkBASIC Game Programming and I'm running into a little trouble in chapter 11. I can't get the LoadSprite application to work. This is the first example from chapter 11.

`----------------------------------------------------------
`Beginner's Guide To DarkBASIC Game Programming
`Copyright (C)2002 Jonathan S. Harbour and Joshua R. Smith
`Chapter 11 - LoadSprite Program
`----------------------------------------------------------

`Initialize the program
SET DISPLAY MODE 640, 480, 32
HIDE MOUSE
`CLS
SYNC ON

`Load the source bitmap file
LOAD BITMAP "F15.bmp", 1

`Grab image 1 from bitmap
GET IMAGE 1,0,0,300,300

`Draw the sprite
SPRITE 1,170,90,1
SYNC

`Wait for keypress
WAIT KEY

END

Its supposed to display a sprite, but all I get is a blank window. I'm using DBPro with all the latest patches. Is there something more that I need to do in DBPro? This was the pro version of this demo though.

I modified a second program from the same chapter and stipped out everything I could and still get it to display. Here is its code:

SET DISPLAY MODE 640,480,32
HIDE MOUSE
SYNC ON

LOAD BITMAP "F15.bmp", 1
GET IMAGE 1,0,0,300,300

LOAD BITMAP "background.bmp", 0

DO
SPRITE 1,170,90,1
SYNC
LOOP

END

If I take the background bitmap command out, it doesn't display the sprite, and if doesn't display if I take out the loop. What exactly is the trick here? I'm kind of at a loss.

Any help or suggestions would be greatly appreciated.

Steve

I don't know what's wrong with it, I don't have DBPro, but if you change this.......

LOAD BITMAP "F15.bmp", 1
GET IMAGE 1,0,0,300,300

To just one line like this......

Load Image "F15.bmp",1

It might fix it.

Pincho.

It's because when you use the load bitmap or create bitmap commands it sets the current bitmap to the number of the new bitmap.
The screen is bitmap 0 so in order to see anything you either need to delete the bitmap or use SET CURRENT BITMAP 0 to see anything on the screen bitmap.

Like pincho says you should use the load image command if all you want to do with the image is use it as a sprite. One thing also not in your code is the LOAD/GET IMAGE texture flag which is used to stop dbpro scaleing and filtering the image for texture use which causes grapfical glitches if used on a sprite. To use it just put ",1" at the end of LOAD/GET IMAGE commands,
GET IMAGE 1,0,0,300,300
becomes
GET IMAGE 1,0,0,300,300,1
You can read more about the texture flag in the dbp command help for LOAD IMAGE.