A few comments about your code. You should call wxFrame::Show(true) as the
last line in your window creation code to allow it to be laid out properly.
You should use the wxMouseEvent's position function.
You select a wxBitmap into the wxMemoryDC before using it right? wxBitmaps
may not be initialized on creation so it's full of random bits, but I am not
sure of this. You can always draw a rectangle to clear it.
Regards,
John
On Fri, May 8, 2009 at 7:25 AM, lostgallifreyan
<lostgallifre...@gmail.com>wrote:
>
> "klaas.holwerda" <n...@klaasholwerda.nl> wrote:
> (06/05/2009 23:00)
>
> >
> >Hi,
> >
> >To add something more, it looks like you need some canvas like sample.
> >wxLua contains wxluacan sample/app.
> >And based on that i made this:
> >http://www.pontademangue.com/canvas/
> >
> >wxArt2D contains much more then the above. But i think it would be an
> >overkill.
> >Although it is more are less completely wrapped to wxLua now.
> >
> >I think you need to optimize drawing the background image as explained,
> >and use it as background for the canvas.
> >
> >Still the above samples are not wrapped into Lua, maybe we actually
> >should make some simple canvas for wxLua.
> >
> >Anyway, hope this helps a bit too.
> >
> >Klaas
> >
>
>
> That's very cool, (even the basic Luacan is neat given the free moving and
> placing and transparency, etc), but on my system it called for a few DLL's
> not native to it, and it does more than I need, I am fairly certain that the
> main binary distribution of wxLua contains all I need, somewhere, somehow.
>
> I've noticed that the W98 SE rendering failure takes two forms, one with,
> and one without, scrollbars. That means the bitmap sometimes fails to form
> before it can be shown, because the code is failing to get its size prior to
> setting the scrollbars. Not sure what all that means yet, though I think
> making the bitmap into smaller sections only delays the onset of the
> problem, so either I go with a single one for ease and convenience and I
> accept the occasional need to wait or reboot, or I go all out to emulate the
> Google Maps tiling system, which I want to avoid doing because it's complex.
>
> For now I've reverted to one of my older ideas, having learned stuff since
> that made it appear to work right. Initially I'd used a wxStaticBitmap() to
> hold the huge chart image. This actually works well despite not being
> intended for that use, and it simplifies the OnPaint handling because I only
> need to redraw the overlaid stuff, not the chart itself, if I do it that
> way. I've translated the direct layer draw idea to a more standard form that
> draws the image as I've been told I ought, though, and this also works:
>
>
> --Complete script, as simplified as I know how, written for wxLua v2.8.7.0.
>
> function main()
> FRAME=wx.wxFrame(wx.NULL,-1,"GPS
> Plot",wx.wxDefaultPosition,wx.wxSize(1024,768),wx.wxDEFAULT_FRAME_STYLE)
> FRAME:CreateStatusBar() FRAME:SetStatusText(" ") --NOTE! Omitting this
> status bar causes display bother, try it...
> FRAME:Centre() FRAME:Show(true)
>
> BITMAP=wx.wxBitmap("Very Big Image.jpg")
> --Ideally try something like 9000,6000 px, on W98 SE, to emulate context.
> :)
> local X,Y=BITMAP:GetWidth(),BITMAP:GetHeight()
> SCROLL=wx.wxScrolledWindow(FRAME,-1) SCROLL:SetScrollbars(1,1,X,Y)
> LAYER=wx.wxPanel(SCROLL,-1,wx.wxPoint(0,0),wx.wxSize(X,Y)) --Layer must
> be created before chart panel.
> PANEL=wx.wxPanel(SCROLL,-1,wx.wxPoint(0,0),wx.wxSize(X,Y))
>
> FRAME:Connect(wx.wxID_EXIT,wx.wxEVT_COMMAND_MENU_SELECTED,function(E)
> FRAME:Close(true) end )
> LAYER:Connect(wx.wxEVT_LEFT_DOWN,OnLeftDown)
> LAYER:Connect(wx.wxEVT_MOTION,OnMotion)
> LAYER:Connect(wx.wxEVT_ERASE_BACKGROUND,function() end)
> PANEL:Connect(wx.wxEVT_ERASE_BACKGROUND,function() end)
> LAYER:Connect(wx.wxEVT_PAINT,OnPaint)
> end
>
> --==================== Mouse Handling ====================--
>
> MX,MY,VX,VY=0,0,0,0
>
> function OnLeftDown(E)
>
>
> MX,MY,VX,VY=wx.wxGetMousePosition():GetX(),wx.wxGetMousePosition():GetY(),SCROLL:GetViewStart()
> end
>
> function OnMotion(E)
> if E:LeftIsDown() then
>
> SCROLL:Scroll(VX+MX-wx.wxGetMousePosition():GetX(),VY+MY-wx.wxGetMousePosition():GetY())
> end
> end
>
> --==================== Track Drawing =====================--
>
> function OnPaint(E)
> local DC=wx.wxPaintDC(PANEL) -chart panel must be drawn before layer
> data.
> if BITMAP then DC:DrawBitmap(BITMAP,0,0,false) end
> DC:delete()
> local DC,P=wx.wxPaintDC(LAYER),wx.wxPen() P:SetColour(255,0,0)
> P:SetWidth(2)
> DC:SetPen(P) DC:DrawLine(0,0,600,600) DC:DrawLine(600,600,1200,0)
> P:delete()
> DC:delete()
> end
>
> --=======================================================--
>
> main()
>
>
> One thing I failed to manage was drawing on demand to the layer in
> OnLeftDown, unless I build the draws into a table to be read from and drawn
> in OnPaint.
>
> I also tried drawing into a MemoryDC to see if I could use a new bitmap
> overlaid over the chart. I noticed that the MemoryDC would contain various
> random stuff as background, which relates to the absence of defined
> background that allows the current layer-draw trick to work, because the
> layer 'appears' over the existing chart background. I don't know if this
> comes under the general heading of 'undefined behaviour' or not, but the
> consistency seems to suggest I can trust it, or perhaps learn more about it
> so I can exploit it more correctly.
>
>
>
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