gridview - Draw TBitmaps in DrawGrid in Delphi -


i have 8 x 16 drawgrid in delphi xe5 randomly fill 9 images i've stored in c:\users\sean ewing\documents\my documents\delphi tutorials\other\math-o-sphere\win32\debug\img. i'm trying 1 image load make sure i'm doing correctly. here code i've used this:

    procedure tform1.grdplayfielddrawcell(sender: tobject; acol, arow: integer;      rect: trect; state: tgriddrawstate);       var         sphereplus: tbitmap;        begin         sphereplus.loadfromfile(extractfilepath(application.exename) + '\img\sphere +1.bmp');         grdplayfield.canvas.draw(0, 0, sphereplus);       end;

the code compiles fine, , based on i've read in embarcadero wiki correct, error @ runtime when it's time load drawggrid. did go wrong?

you need first create bitmap before can use it:

procedure tform1.grdplayfielddrawcell(sender: tobject; acol, arow: integer;  rect: trect; state: tgriddrawstate);   var     sphereplus: tbitmap;   begin     sphereplus := tbitmap.create;     try       sphereplus.loadfromfile(extractfilepath(application.exename) +            '\img\sphere +1.bmp');       grdplayfield.canvas.draw(0, 0, sphereplus);           sphereplus.free;     end;   end;

the other thing should aware of rect parameter receive in event area needs painted, you'll want use canvas.stretchdraw , pass rectangle. won't current issue, you'll need when move next step. can identify exact cell that's being drawn acol , arow parameters, can use information load specific image column, instance, or output text column or row.

// load specific image cell passed in acol , arow, // , draw appropriate area using rect provided. grdplayfield.canvas.stretchdraw(rect, sphereplus);

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