Better image panel for custom header option

src/visual/ImagePanel.cpp

@@ -0,0 +1,50 @@
+#include "ImagePanel.h"
+ 
+BEGIN_EVENT_TABLE(ImagePanel, wxPanel)
+EVT_PAINT(ImagePanel::paintEvent)
+END_EVENT_TABLE()
+ 
+
+ImagePanel::ImagePanel(wxPanel * parent, wxString file, wxBitmapType format) :
+	wxPanel(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE) {
+	image.LoadFile(file, format);
+}
+
+void ImagePanel::paintEvent(wxPaintEvent & evt) {
+    wxPaintDC dc(this);
+    render(dc);
+}
+ 
+
+void ImagePanel::paintNow() {
+    wxClientDC dc(this);
+    render(dc);
+}
+ 
+
+void ImagePanel::render(wxDC&  dc) {
+
+	double imagew = image.GetWidth();
+	double imageh = image.GetHeight();
+
+	wxSize destSize = dc.GetSize();
+
+	double destw = destSize.GetWidth();
+	double desth = destSize.GetHeight();
+
+	double sf = 1.0, wf, hf;
+
+	wf = destw / imagew;
+	hf = desth / imageh;
+
+	sf = (wf < hf)?wf:hf;
+
+	double resulth = imageh * sf;
+	double resultw = imagew * sf;
+
+	dc.SetUserScale(sf, sf);
+    dc.DrawBitmap( image, (destw/2 - resultw/2)/sf, (desth/2 - resulth/2)/sf, false );
+}
+
+ 
+ 

src/visual/ImagePanel.h

@@ -0,0 +1,16 @@
+#include <wx/wx.h>
+#include <wx/sizer.h>
+ 
+class ImagePanel : public wxPanel {
+	wxBitmap image;
+
+public:
+	ImagePanel(wxPanel* parent, wxString file, wxBitmapType format);
+
+	void paintEvent(wxPaintEvent & evt);
+	void paintNow();
+
+	void render(wxDC& dc);
+
+	DECLARE_EVENT_TABLE()
+};