OpenEuphoria

1. Need some help with wxEuphoria

• Posted by RStowasser Feb 25, 2009
• 854 views
• Last edited Feb 26, 2009

Hello,

How could I improve this little bit of code derived from win32lib?

-- example11.exw 
-- 
-- Creates a Moire pattern with colored lines 
 
include wxeud.e 
 
constant Default = -1 
	, BrightRed   = create( wxColour, {255,0,0}) 
	, BrightGreen = create( wxColour, {0,255,0}) 
	, BrightBlue  = create( wxColour, {0,0,255}) 
 
constant WinFrame = create( wxFrame, {0,-1,"Colors", Default, Default, 150, 150} ) 
constant DrawWin  = create( wxPanel, WinFrame ) 
 
-- pen colors 
constant RedPen = create( wxPen, {BrightRed, 1, wxSOLID} ) 
constant GreenPen = create( wxPen, {BrightGreen, 1, wxSOLID} ) 
constant BluePen = create( wxPen, {BrightBlue, 1, wxSOLID} ) 
 
 
procedure onPaint_DrawWin( atom this, atom id, atom event_type, atom event ) 
    atom dc 
     
    dc = create( wxClientDC, DrawWin ) 
    begin_drawing(dc) 
 
    for i = 1 to 150 by 3 do 
        for j = 0 to 3 do 
         
            -- pick a color 
            if      j < 1 then      set_pen( dc, RedPen ) 
            elsif   j < 2 then      set_pen( dc, GreenPen ) 
            else                    set_pen( dc, BluePen ) 
            end if               
 
            -- draw the line 
            draw_line( dc, {1, 1, i+j, 150} ) 
            draw_line( dc, {1, 1, 150, i+j} ) 
                 
        end for 
    end for 
     
    end_drawing(dc) 
    delete_instance(dc) 
end procedure 
-- tell Windows when to do the action 
set_event_handler( DrawWin, get_id(DrawWin), wxEVT_LEFT_DOWN, routine_id( "onPaint_DrawWin" )) 
 
wxMain( WinFrame) 

If I click on the window the pattern will be drawn. If I use the wxEVT_PAINT event, then there will be an endless loop and I have to kill the example with the task-manager in Windows. The same problem occurs with bench_draw.exw of the demos.

Is there another event type which I could use to draw the pattern when the window opens? wxEVT_ACTIVATE or wxEVT_SHOW seem not to return the expected result.

Roland

3. Re: Need some help with wxEuphoria

• Posted by mattlewis (admin) Feb 26, 2009
• 721 views

Yes. A wxClientDC is for drawing to a window outside of a paint event.

Matt