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// systemtap grapher
// Copyright (C) 2009 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#include "Graph.hxx"
#include <sstream>
#include <iostream>
#include <iomanip>
namespace systemtap
{
using namespace std;
using namespace std::tr1;
GraphDataList GraphDataBase::graphData;
sigc::signal<void> GraphDataBase::graphDataChanged;
int64_t Graph::_currentTime = 0;
Graph::Graph(double x, double y)
: _width(600), _height(200), _graphX(0), _graphY(0),
_graphWidth(580), _graphHeight(180),
_lineWidth(2), _autoScaling(true), _autoScrolling(true),
_zoomFactor(1.0), _xOffset(20.0), _yOffset(0.0),
_playButton(new CairoPlayButton), _timeBase(0),
_left(0), _right(1), _top(5.0), _bottom(0.0)
{
setOrigin(x, y);
_graphX = x;
_graphY = y;
}
void Graph::draw(Cairo::RefPtr<Cairo::Context> cr)
{
if (_autoScaling)
{
// Find latest time.
_right = _currentTime / 1000;
// Assume 1 pixel = 5 milliseconds
_left = _right - static_cast<int64_t>(5000 / _zoomFactor);
}
cr->save();
double horizScale = getHorizontalScale();
cr->translate(_xOffset, _yOffset);
cr->set_line_width(_lineWidth);
for (GraphDataList::iterator itr = _datasets.begin(), e = _datasets.end();
itr != e;
++itr)
{
shared_ptr<GraphDataBase> graphData = *itr;
cr->save();
cr->translate(0.0, _graphHeight);
cr->scale(1.0, -1.0);
graphData->style->draw(graphData, this, cr);
cr->restore();
cr->save();
cr->select_font_face("Sans", Cairo::FONT_SLANT_NORMAL,
Cairo::FONT_WEIGHT_BOLD);
cr->set_font_size(14.0);
cr->set_source_rgba(1.0, 1.0, 1.0, .8);
if (!graphData->title.empty())
{
cr->move_to(20.0, 20.0);
cr->show_text(graphData->title);
}
if (!graphData->xAxisText.empty())
{
cr->move_to(10.0, _graphHeight - 5);
cr->show_text(graphData->xAxisText);
}
if (!graphData->yAxisText.empty())
{
cr->save();
cr->translate(10.0, _height - 10.0);
cr->rotate(-M_PI / 2.0);
cr->move_to(10.0, 0.0);
cr->show_text(graphData->yAxisText);
cr->restore();
}
cr->restore();
}
cr->restore();
// Draw axes
double diff = static_cast<double>(_right - _left);
int64_t majorUnit
= static_cast<int64_t>(pow(10.0, floor(log(diff) / log(10.0))));
int64_t startTime = ((_left - _timeBase) / majorUnit) * majorUnit + _timeBase;
cr->save();
cr->set_source_rgba(1.0, 1.0, 1.0, .9);
cr->set_line_cap(Cairo::LINE_CAP_BUTT);
cr->set_line_width(_lineWidth);
cr->select_font_face("Sans", Cairo::FONT_SLANT_NORMAL,
Cairo::FONT_WEIGHT_NORMAL);
cr->set_font_size(10.0);
cr->translate(_xOffset, 0.0);
cr->move_to(0.0, _yOffset);
cr->line_to(0.0, _height);
cr->move_to(0.0, _graphHeight);
cr->line_to(_graphWidth - _xOffset, _graphHeight);
cr->stroke();
std::valarray<double> dash(1);
dash[0] = _graphHeight / 10;
cr->set_dash(dash, 0);
double prevTextAdvance = 0;
for (int64_t tickVal = startTime; tickVal <= _right; tickVal += majorUnit)
{
double x = (tickVal - _right) * horizScale + _graphWidth;
cr->move_to(x, _yOffset);
cr->line_to(x, _graphHeight);
std::ostringstream stream;
stream << (tickVal - _timeBase);
Cairo::TextExtents extents;
cr->get_text_extents(stream.str(), extents);
// Room for this label?
if (x + extents.x_bearing > prevTextAdvance)
{
cr->move_to(x, _graphHeight + 5 + extents.height);
cr->show_text(stream.str());
prevTextAdvance = x + extents.x_advance;
}
}
cr->stroke();
cr->restore();
if (!_autoScrolling)
{
_playButton->setVisible(true);
_playButton->setOrigin(_graphWidth / 2 - 25, .875 * _graphHeight - 50);
_playButton->draw(cr);
}
}
void Graph::addGraphData(shared_ptr<GraphDataBase> data)
{
_datasets.push_back(data);
}
void Graph::getExtents(int64_t& left, int64_t& right, double& top,
double& bottom) const
{
left = _left;
right = _right;
top = _top;
bottom = _bottom;
}
void Graph::setExtents(int64_t left, int64_t right, double top, double bottom)
{
_left = left;
_right = right;
_top = top;
_bottom = bottom;
}
bool Graph::containsPoint(double x, double y)
{
return x >= _x0 && x < _x0 + _width && y >= _y0 && y < _y0 + _height;
}
int64_t Graph::getTimeAtPoint(double x)
{
return (x - _graphWidth) / getHorizontalScale() + _right;
}
void Graph::window2GraphCoords(double x, double y,
double& xgraph, double& ygraph)
{
xgraph = x -_xOffset;
ygraph = -(y - _graphY) + _yOffset + _graphHeight;
}
}
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