> I am programming a small game in Delphi 5 as a way to teach myself the
> program. I'm using a tile-based approach to graphics on the screen using
> a Timage component to store a background and a Timagelist component to
> store the tiles themselves. All my drawing in done on the mainform
> canvas.

> I have the following problem. If I open the program only the background
> image is displayed. If I then load a savefile for the game, then the
> screen is updated by placing the tiles at the correct locations. If I
> then attempt to load a different savefile I start to get graphics
> problems. It almost seems as if the screen is painting itself over the
> TOpenDialog component before actually removing the component itself.
> Consequently, for split second the screen look really as I have trees
> and other tiles painted over the TOpenDialog component. I have
> doublebuffering set to true to reduce flicker when repainting the
> screen.

> If anybody has any experience in such matters or could offer a solution
> it would be much appreciated.

> Thanks

> Ewan

> > All my drawing in done on the mainform
> > canvas.

> That's fine only if you're drawing on the form's canvas in its OnPaint
> handler.
> Otherwise your drawing won't have any persistence.

> Instead of using the OnPaint handler to control all the drawing, you can
> draw
> on an in-memory TBitmap, usually the same size as  a TImage, and then
> display the TBitmap in a TImage.  The TImage is "smart" enough to have
> persistence.

> --
> efg          Earl F. Glynn, Overland Park, KS  USA

> efg's Computer Lab:  http://www.efg2.com/Lab
> Mirror:  http://homepages.borland.com/efg2lab/Default.htm

> I write tile editors for our company and I have had a few problems with
> persistence on the image.  One good way as E.F.G. suggested is to use a
> TBitmap and then when your done copy it to the TImage.  Also gotta watch how
> your blitting thse tiles. If you are using API then you may need to refresh
> to update the TImage. Also, if you are using the TImage as your control then
> you don't need to overide the onpaint proc, it manages this for you
> automatically, you would be fighting for who gets to paint

> "Ewan Thiele" <tunawh...@hotmail.com> wrote in message
> news:3A819CE0.70B7523D@hotmail.com...
> > Hi There

> > I am programming a small game in Delphi 5 as a way to teach myself the
> > program. I'm using a tile-based approach to graphics on the screen using
> > a Timage component to store a background and a Timagelist component to
> > store the tiles themselves. All my drawing in done on the mainform
> > canvas.

> > I have the following problem. If I open the program only the background
> > image is displayed. If I then load a savefile for the game, then the
> > screen is updated by placing the tiles at the correct locations. If I
> > then attempt to load a different savefile I start to get graphics
> > problems. It almost seems as if the screen is painting itself over the
> > TOpenDialog component before actually removing the component itself.
> > Consequently, for split second the screen look really as I have trees
> > and other tiles painted over the TOpenDialog component. I have
> > doublebuffering set to true to reduce flicker when repainting the
> > screen.

> > If anybody has any experience in such matters or could offer a solution
> > it would be much appreciated.

> > Thanks

> > Ewan

> Thanks for the Reply. I've updated my code to reflect E.F.G. 's suggestion
and
> everything works great. Basically, I'm loading the images that are stored
in a
> Timagecomponent and then masking them to the "Now Brand New And Fully
Operation
> TImage Control" using dummy TBitmaps and the GetBitmap method. I'm not
quite
> sure what you mean by blitting, though. I'm not using the OnPaint Event
Handler
> at all at present.

> Ewan

> Ron wrote:

> > have your tried a controlname.refresh; command at the end of your
graphics
> > loading routine??

> > I write tile editors for our company and I have had a few problems with
> > persistence on the image.  One good way as E.F.G. suggested is to use a
> > TBitmap and then when your done copy it to the TImage.  Also gotta watch
how
> > your blitting thse tiles. If you are using API then you may need to
refresh
> > to update the TImage. Also, if you are using the TImage as your control
then
> > you don't need to overide the onpaint proc, it manages this for you
> > automatically, you would be fighting for who gets to paint

> > "Ewan Thiele" <tunawh...@hotmail.com> wrote in message
> > news:3A819CE0.70B7523D@hotmail.com...
> > > Hi There

> > > I am programming a small game in Delphi 5 as a way to teach myself the
> > > program. I'm using a tile-based approach to graphics on the screen
using
> > > a Timage component to store a background and a Timagelist component to
> > > store the tiles themselves. All my drawing in done on the mainform
> > > canvas.

> > > I have the following problem. If I open the program only the
background
> > > image is displayed. If I then load a savefile for the game, then the
> > > screen is updated by placing the tiles at the correct locations. If I
> > > then attempt to load a different savefile I start to get graphics
> > > problems. It almost seems as if the screen is painting itself over the
> > > TOpenDialog component before actually removing the component itself.
> > > Consequently, for split second the screen look really as I have trees
> > > and other tiles painted over the TOpenDialog component. I have
> > > doublebuffering set to true to reduce flicker when repainting the
> > > screen.

> > > If anybody has any experience in such matters or could offer a
solution
> > > it would be much appreciated.

> > > Thanks

> > > Ewan