Commit 4936ca3a authored by charras's avatar charras
Browse files

Testing a new fast draw algo to draw grid.

parent 6efce74c

common/drawpanel.cpp

+32 −3
Original line number Diff line number Diff line
@@ -757,14 +757,18 @@ void WinEDA_DrawPanel::DrawBackGround( wxDC* DC ) 
    if( drawgrid )

    {

        m_Parent->PutOnGrid( &org );



        GRSetColorPen( DC, color );

        int xpos, ypos;



#if 0   // Use a pixel based draw to display grid

        // There is a lot of calls, so the cost is hight

        // and grid is slowly drawn on some platforms

        for( ii = 0; ; ii++ )

        {

            xg =  wxRound(ii * screen_grid_size.x);

            if( xg > size.x )

                break;

            int xpos = org.x + xg;

            xpos = org.x + xg;

            xpos = GRMapX( xpos );

            for( jj = 0; ; jj++ )

            {
@@ -776,6 +780,31 @@ void WinEDA_DrawPanel::DrawBackGround( wxDC* DC ) 
            }



        }

#else   // Currently on test: Use a fast way to draw the grid

        // a grid column is drawn; and then copied to others grid columns

        // this is possible because the grid is drawn only after clearing the screen.

        ii = 1;

        xg =  wxRound(ii * screen_grid_size.x);

        int x0pos = GRMapX( org.x + xg);

        for( jj = 0; ; jj++ )

        {

            yg = wxRound(jj * screen_grid_size.y);

            if( yg > size.y )

                break;

            ypos = org.y + yg;

            DC->DrawPoint( x0pos, GRMapY( ypos ) );

        }



        ypos = GRMapY(org.y);

        for( ii = 2; ; ii++ )

        {

            xg =  wxRound(ii * screen_grid_size.x);

            if( xg > size.x )

                break;

            xpos = GRMapX( org.x + xg );

            DC->Blit( xpos, ypos, 1, size.y, DC, x0pos, ypos  );

        }

#endif

    }



    /* Draw axis */