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I'm new to dark GDK and relatively new to c++. I would like some help on returning a value from the dbPoint() command. In the instance I need help with, I'm trying to determine if a sprite is on a certain path by picking up the color of the background. I've loaded the background as a sprite... like this...

dbLoadImage ( "track.bmp",1);
dbSprite (1,0,0,1 );

then trying to extract the color of the point...

DWORD track,stripe,testp1,testp2;
track=dbPoint(10,10);
stripe=dbPoint(264,110);

the color at the points indicated should be a green and a yellow. When I debug and break the program, the values contained in track and stripe are both 0. I've also tried declaring the variables as int and long. Any help would be appreciated. Thanks, Jim.

You'll need to give more info than that.

I suggest that you post the image you use for your backdrop (or something that can be tested against), and your code (or code that contains your checks and still doesn't work), then we can look at it.

dbPoint doesn't work on sprites

Oops, never noticed that ... so why didn't you tell him how to get it to work with sprites?

@Jim H,
Sprites, in their default setting, leave no trace on the background. If you have the backdrop on, they are overwritten with the blue you normally see. If you have the backdrop off, then the background will saved before displaying the sprite and replaced after - this is so you can move the sprite without having to redraw the background.

To get this working for you, just use two simple commands after you create the sprite:


The middle number in the first commands sets the sprite backsave option to 'off' and disables the saving. The second command removes the backdrop - this means that you'll have to clear the backdrop yourself if you need that, using the dbCls function.