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Using wxMemoryDC to draw on a jpeg

by Steve_BZ (Chaplain)
on Sep 27, 2009 at 01:26 UTC ( [id://797727]=CUFP: print w/replies, xml ) Need Help??

I found it hard to locate any easy examples of drawing on Bitmaps using wxPerl. Here is some working code that I put together to see if I could make it work. Just make sure you point the .jpg filename to one that exits on your machine, and you have wxPerl installed. Many thanks to Huub Peters for helping me with Mouse events and understanding DC.
#!/usr/bin/perl -w -- use Wx 0.15 qw[:allclasses]; use strict; use warnings; package MyFrame; use Wx qw[:everything]; use base qw(Wx::Frame); use strict; our $gl_self; sub new { my( $self, $parent, $id, $title, $pos, $size, $style, $name ) = @_ +; $parent = undef unless defined $parent; $id = wxID_ANY unless defined $id; $title = "" unless defined $title; $pos = wxDefaultPosition unless defined $pos; $size = wxDefaultSize unless defined $size; $name = "" unless defined $name; $style = wxDEFAULT_FRAME_STYLE unless defined $style; $self = $self->SUPER::new( $parent, $id, $title, $pos, $size, $sty +le, $name ); $self->SetTitle("Drawing on image"); $gl_self= $self; # Set Global variable for use in EVT handler # Image for drawing on $self->{image1} = Wx::Image->new( 'C:\insert_your_jpeg.jpg', wxBI +TMAP_TYPE_ANY, -1 ); $self->{Loc_Photo_Bmp} = Wx::Bitmap->new( $self->{image1} ) ; $self->{bitmap_1} = Wx::StaticBitmap->new( $self, wxID_ANY, $self- +>{Loc_Photo_Bmp}); # Button to draw image use Wx::Event qw( EVT_LEFT_UP ); $self->{bitmap_1}->SetCursor(wxCROSS_CURSOR); $self->{bitmap_1}->Connect( wxID_ANY,wxID_ANY,wxEVT_LEFT_UP, \&on_ +button ); # # Sizer # $self->{sizer_1} = Wx::BoxSizer->new(wxVERTICAL); $self->{sizer_1}->Add($self->{bitmap_1}, 0, 0, 0); $self->SetSizer($self->{sizer_1}); $self->{sizer_1}->Fit($self); $self->Layout(); return $self; } sub on_button{ my ($self, $event) = @_; # select it into a memory dc if (defined $gl_self->{Loc_Photo_Bmp}){ my $mdc = Wx::MemoryDC->new(); $mdc->SelectObject($gl_self->{Loc_Photo_Bmp}); my $pen = Wx::Pen->new( Wx::Colour->new(255,255,255), 3, wxSOL +ID); $mdc->SetPen( $pen ); $mdc->SetBrush( wxTRANSPARENT_BRUSH ); # Determine mouse event # my $m= Wx::MouseEvent->new($event); my $r = 50; my $x=$event->GetX(); my $y=$event->GetY(); # Draw circle round mouse event $mdc->DrawCircle( $x, $y, $r ); $mdc->SelectObject(wxNullBitmap); # deselect the bitmap out of + the DC $gl_self->{bitmap_1} ->SetBitmap($gl_self->{Loc_Photo_Bmp}); $gl_self->{bitmap_1}->SetCursor(wxSTANDARD_CURSOR); $gl_self->{bitmap_1}->Disconnect( wxID_ANY,wxID_ANY,wxEVT_LEFT +_DOWN ); $gl_self->{bitmap_1}->Disconnect( wxID_ANY,wxID_ANY,wxEVT_LEFT +_UP ); } $event->Skip() ; return $self; } 1; package main; unless(caller){ local *Wx::App::OnInit = sub{1}; my $app = Wx::App->new(); Wx::InitAllImageHandlers(); my $frame_1 = MyFrame->new(); $app->SetTopWindow($frame_1); $frame_1->Show(1); $app->MainLoop(); }

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