[ wxwindows-Bugs-1695580 ] SetAxisOrientation PaintDC vs GCDC

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Bugs item #1695580, was opened at 2007-04-06 13:19
Message generated for change (Comment added) made by chulbe2lsu
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Category: Common
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: PStevens (pmstevens)
Assigned to: Stefan Csomor (csomor)
Summary: SetAxisOrientation PaintDC vs GCDC

Initial Comment:
Phillip Stevens wrote:
> Hi wxPython-users,
> 
> Attached is a small example of using SetAxisOrientation with GCDC,
> and then again with a regular PaintDC.
> 
> In the case of using a regular PaintDC,  the Y axis is flipped.
> In the case of using the GCDC's PaintDC,  the Y axis does not seem to
> flip.
> 
> The two cases can be seen by changing USEGCDC = False to True.
> 
> Is this a bug, 

Probably.  Please enter a bug report about it.

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Comment By: cch (chulbe2lsu)
Date: 2007-04-09 18:21

Message:
Logged In: YES 
user_id=1327179
Originator: NO

Here's another case I think related to this one. The image is flipped
vertically and the SetDeviceOrigin does not seem to start at the bottom
like on other platforms (e.g. GTK).


#include <wx/wx.h>

static unsigned char colormap[] = {
0, 0, 143, 0, 0, 159, 0, 0, 175, 0, 0, 191, 0, 0, 207, 0, 0, 223, 0,
0, 239,
0, 0, 255, 0, 16, 255, 0, 32, 255, 0, 48, 255, 0, 64, 255, 0, 80, 255,
0, 96, 255, 0, 112, 255, 0, 128, 255, 0, 143, 255, 0, 159, 255, 0,
175, 255,
0, 191, 255, 0, 207, 255, 0, 223, 255, 0, 239, 255, 0, 255, 255, 16,
255, 239,
32, 255, 223, 48, 255, 207, 64, 255, 191, 80, 255, 175, 96, 255, 159,
112, 255, 143, 128, 255, 128, 143, 255, 112, 159, 255, 96, 175, 255,
80,
191, 255, 64, 207, 255, 48, 223, 255, 32, 239, 255, 16, 255, 255, 0,
255, 239, 0, 255, 223, 0, 255, 207, 0, 255, 191, 0, 255, 175, 0, 255,
159, 0,
255, 143, 0, 255, 128, 0, 255, 112, 0, 255, 96, 0, 255, 80, 0, 255,
64, 0,
255, 48, 0, 255, 32, 0, 255, 16, 0, 255, 0, 0, 239, 0, 0, 223, 0, 0,
207, 0, 0, 191, 0, 0, 175, 0, 0, 159, 0, 0, 143, 0, 0, 128, 0, 0

};

class test_wxfile : public wxApp {
    virtual bool OnInit();

};

class test_frame : public wxFrame {
public:
    test_frame();
    void OnPaint(wxPaintEvent &e);
private:
    unsigned char rgb_data[3*100];
    DECLARE_EVENT_TABLE()

};

IMPLEMENT_APP(test_wxfile);

BEGIN_EVENT_TABLE(test_frame, wxFrame)
    EVT_PAINT  (test_frame::OnPaint)
END_EVENT_TABLE()

bool
test_wxfile::OnInit()
{
    test_frame *f = new test_frame();
    SetTopWindow(f);
    return true;

}

test_frame::test_frame() :
wxFrame(NULL,-1,"test_frame",wxPoint(-1,-1),wxSize(100,100))
{
    double cscl = 64.0 / 100.0;
    for (int k = 0; k < 100; k++ ) {
            int idx = k*cscl;
            rgb_data[3*k  ] = colormap[3*idx];
            rgb_data[3*k+1] = colormap[3*idx+1];
            rgb_data[3*k+2] = colormap[3*idx+2];
    }
    this->Show(true);

}

void
test_frame::OnPaint(wxPaintEvent &e)
{
    wxCoord w,h;
    double  xscl,yscl;
    wxImage img = wxImage(10,10,rgb_data,true);
    wxPaintDC *dc = new wxPaintDC(this);
    dc->GetSize(&w,&h);

    // Set bottom-up and set device origin
    dc->SetAxisOrientation(true,true);
    dc->SetDeviceOrigin(.25*w,.25*h);
    // Scale the image
    xscl = static_cast<double>(.5*w) / 11;
    yscl = static_cast<double>(.5*h) / 11;
    img = img.Scale(11*xscl,11*yscl);
    wxBitmap bmp = wxBitmap(img);
    dc->DrawBitmap(bmp,0,0,false);
    delete dc;
}

----------------------------------------------------------------------

Comment By: Robin Dunn (robind)
Date: 2007-04-06 16:59

Message:
Logged In: YES 
user_id=53955
Originator: NO

Not wxPython specific.  Reassigning to Stefan.

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