Simple Histogram Widget for wxWidgets

Guy — Thu, 13 Aug 2009 20:25:28 +0000

When working on Open Yahtzee 1.10 (or what ever I’ll call the version after 1.9), I’ve written a simple histogram widget to be part of the new statistics dialog. I should emphasize the simple part, this widget was mean to display a simple histogram without requiring any special bloated ploting libraries. It doesn’t support all the fancy stuff, just plain histogram.

I’ve figured that a simple pie plot would better serve Open Yahtzee’s needs, so unfortunately this code will not be released as part of the program. While the code is not perfect, it’s functional and serves a good example of a custom widget. So I’ve felt pity letting it fall into oblivion in Open Yahtzee’s SVN repository, and I’ve thought it might come handy to someone else (or at least for me) if it will be easily accessible.

The widget is made up of two files: simple_histogram.h and simple_histogram.cpp. The code uses stl::vector to pass the plotting data and depenpends on BOOST_FOREACH (but it can easily be removed).

simple_histogram.h:

/***************************************************************************
 *   Copyright (C) 2009 by Guy Rutenberg   *
 *   http://www.guyrutenberg.com/contact-me   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#include 
#include 
 
#ifndef SIMPLE_HISTOGRAM_INC
#define SIMPLE_HISTOGRAM_INC
 
class SimpleHistogram : public wxPanel {
public:
	SimpleHistogram (wxWindow* parent, wxWindowID id,
		 const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
		 long style = wxNO_BORDER, const wxString& name = wxPanelNameStr);
	void SetData(std::vector<double> d);
	void OnPaint(wxPaintEvent& event);
	void OnResize(wxSizeEvent& event);
private:
	std::vector<double> data;
	double data_total;
};
 
#endif

simple_histogram.cpp:

/***************************************************************************
 *   Copyright (C) 2009 by Guy Rutenberg   *
 *   http://www.guyrutenberg.com/contact-me   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#include "simple_histogram.h"
#include 
#include 
using namespace std;
 
SimpleHistogram::SimpleHistogram(wxWindow* parent, wxWindowID id,
				const wxPoint& pos, const wxSize& size,
				long style, const wxString& name)
				: wxPanel(parent, id, pos, size, style, name)
{
	Connect(this->GetId(), wxEVT_PAINT, wxPaintEventHandler(SimpleHistogram::OnPaint));
	Connect(this->GetId(), wxEVT_SIZE, wxSizeEventHandler(SimpleHistogram::OnResize));
 
}
 
void SimpleHistogram::OnPaint(wxPaintEvent& event)
{
	wxPaintDC pdc(this);
	auto_ptr<wxGraphicsContext> dc(wxGraphicsContext::Create(pdc));
 
	dc->SetBrush(*wxBLUE_BRUSH);
	int width, height;
	GetClientSize(&width, &height);
 
	const double column_width = static_cast<double>(width) / data.size();
 
	int i = 0;
	double item_x, item_y, item_ratio, item_height;
	BOOST_FOREACH(double d, data) {
		item_x = i * column_width;
		item_ratio = data_total ? d/data_total : 0;
		item_height = item_ratio * height;
		item_y = height-item_height;
		dc->DrawRectangle(item_x, item_y, column_width, item_height);
		i++;
	}
}
 
void SimpleHistogram::OnResize(wxSizeEvent& event)
{
	Refresh();
	event.Skip();
}
 
void SimpleHistogram::SetData(vector<double> d)
{
	data.assign(d.begin(), d.end());
	data_total = 0;
	BOOST_FOREACH(double tmp, data) {
		data_total += tmp;
	}
}

UPDATE 2009-08-17: Removed commented out function – DoGetBestSize().

Setting Up OmniComplete (Autocompletion) for wxWidgets in Vim

Guy — Sat, 23 Feb 2008 19:27:11 +0000

I use Vim as my main IDE for C/C++ related development (as well as for almost all other development). If you use (or thinking about using) vim as as an IDE, you better get some good autocompletion functionality. This kind of autocompletion is provided by the OmniComplete, which is available since Vim 7.0. Just having the OmniComplete is a nice thing, but it’s much more helpful if configured properly to work with the libraries you use, such as wxWidgets. In this post I will show you how to get working the OmniComplete for wxWidgets, however, the procedure I will show can be easily adapted to almost all libraries.

The first step is to install ctags (if you haven’t got it already installed), this provides the tags file, on which the autocompletion is based. ctags is available directly from the package manager of all popular distro’s.

The next step is to install the OmniCppComplete plugin for vim. The plugin uses the ctags‘ generated tags file for the autocompletion. In order for the autocompletion to properly work with classes, you need to create the ~/.ctags file and add some default options. Each option should be listed in a newline. Your ~/.ctags file should look like this:

--c++-kinds=+p
--fields=+iaS
--extra=+q

These options will now be used as default when running ctags.

The next step is to create a tag file for the wxWidgets library. This can be done using the following command:

 ctags -f ~/.vim/wxwidgetstags -R /usr/include/wx-2.8

Don’t forget to replace /usr/include/wx-2.8 with the path to the header files of wxWidgets. This will create the tags file under your ~/.vim directory.

The next step is to tell vim to use this tags file. This is done by adding the following line to your ~/.vimrc:

:set tags+=~/.vim/wxwidgetstags

And now your done. OmniComplete will now work for wxWidgets, listing members and functions for any of the wxWidgets classes.
Remember you can repeat the last two steps for any other libraries you use in order for the OmniComplete to work with them too.

N.B. don’t forget to run ctags -R . in your projects root dir if you want OmniComplete to work for classes you defined.

Guy Rutenberg » wxWidgets

Simple Histogram Widget for wxWidgets

Setting Up OmniComplete (Autocompletion) for wxWidgets in Vim