> Le 4 mars 2018 à 10:55, Jeffrey R. Carter <jrcar...@acm.org> a écrit : > > I tried changing the body of > Gnoga.Gui.Element.Canvas.Context_2D.Plotting.Graph to > > procedure Graph (Plot : in out Plot_Info; > List : in Point_List; > Color : in Gnoga.Types.RGBA_Type := Black) > is > Context : Context_2D_Type; > begin -- Graph > if List'Length > 1 then > Context.Get_Drawing_Context_2D (Canvas => Plot); > Context.Begin_Path; > Context.Stroke_Color (Value => Color); > Context.Move_To (X => Plot.Scale_X (List (List'First).X), > Y => Plot.Scale_Y (List (List'First).Y)); > > All_Points : for I in List'First + 1 .. List'Last loop > -- Plot.Line (From => List (I), To => List (I + 1), Color => > Color); > Context.Line_To (X => Plot.Scale_X (List (I).X), > Y => Plot.Scale_Y (List (I).Y)); > end loop All_Points; > > Context.Stroke; > end if; > end Graph; > > in hopes that it would be faster than calling Line for each pair of points. > Maybe it is a little faster, but in Plot_Test the call to Graph to plot the > Mexican-hat function results in the screen remaining unchanged for several > seconds, followed by the entire curve appearing. This feels at least as long > as > drawing each segment individually, so I prefer the existing version which at > least provides feedback that it's doing something. What do others think about > this? > > -- > Jeff Carter > "He didn't get that nose from playing ping-pong." > Never Give a Sucker an Even Break > 110 >
Hello Jeff, Have you tried to call the Stroke method inside the loop instead of calling it at the end? HTH, Pascal. http://blady.pagesperso-orange.fr ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Gnoga-list mailing list Gnoga-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gnoga-list
