<?php

# -----------------------------------------------------------------------------
#
# Plots a simple marker plot (optionally connected)
#
# -----------------------------------------------------------------------------
#
# Copyright (C) 2004 Christian Eheim
#
# This file is part of TVEz (tvez.sourceforge.net).
#
# TVEz 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.
#
# TVEz 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 TVEz; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# -----------------------------------------------------------------------------
#
# Created on 02/01/2004 by Christian Eheim (hide@address.com)
#
# LAST MODIFIED:
# $Date: 2004/02/03 00:02:17 $
# $Revision: 1.2 $
# $Author: eheim $
#
# -----------------------------------------------------------------------------

/*
-------------------------------------------------------------------------------
TODO:
	- Only works for evenly speced data right now
-------------------------------------------------------------------------------
*/


include("Graph.php");

class Plot extends Graph {
	
	var $_sum;

	var $_marker;
	var $_markerColor;
	var $_markerSize;
	var $_connected;
	var $_lineColor;

	var $_graphLeft;
	var $_graphTop;
	var $_graphWidth;
	var $_graphHeight;

	var $_mcolor;
	var $_lcolor;

	function Plot($width,$height,$title=null) {
		# Instantiate the base class
		$this->Graph($width,$height,$title);

		# Set the base class properties
		$this->legend_show(false);
		$this->set_bgcolor("#dddddd");
		
		$this->set_margin(1,5,1,1);
		$this->set_x_axis_title_margin(3);
		$this->set_y_axis_title_margin(3);

		$this->_marker		= "circle";
		$this->_markerColor	= "red";
		$this->_markerSize 	= 4;
		$this->_lineColor	= "red";
		$this->_connected	= false;
	}

	function set_marker_type($type) {
		$this->_marker = $type;
	}
	function set_marker_size($size) {
		$this->_markerSize = 2*$size;
	}
	function set_marker_color($color) {
		$this->_markerColor = $color;
	}
	function set_line_color($color) {
		$this->_lineColor = $color;
	}
	function set_marker_connected($bool) {
		$this->_connected = $bool;
	}

	#
	# Generate the legend items
	# We only allow one data set at this time, so there is no reason
	# for a legend
	#
	function generate_legend() {
		;
	}
	#
	# Generate the axes
	#
	function generate_axes() {

		list($min,$max) = $this->minmax();
		list($lx,$ly) = $this->get_longest();

		if ($this->get_y_axis_min_value() === "unset")
			$this->set_y_axis_min_value($min);
		if ($this->get_y_axis_max_value() === "unset")
			$this->set_y_axis_max_value($max);

		if (! $this->get_x_axis_num_ticks()) {
			$l = array();
			foreach ($this->_data as $label => $value) {
				array_push($l,$label);
			}
			$this->set_x_axis_labels($l);
		}
		else {
			# This is not good
			$lx = $this->get_x_axis_min_value();
		}

		$this->set_x_axis_longest($lx);
		$this->set_y_axis_longest($ly);

#		if ($this->get_y_axis_min_value() === "unset") {
#		}
	}
	#
	# Draw the Bar Graph
	#
	function create_graph() {

		$min = $this->get_y_axis_min_value();
		$max = $this->get_y_axis_max_value();
		$this->_sum = $this->sum();
		
		$this->compute();

		$count = count($this->_data);

		$dwidth = $this->_graphWidth / ($count-1);
		$left = $this->_graphLeft;

		$this->_mcolor = $this->_image->_rgb->allocate_color($this->_markerColor);
		$this->_lcolor = $this->_image->_rgb->allocate_color($this->_lineColor);

		$i=0;
		$lastLeft = null; $lastTop = null;
		foreach ($this->_data as $label => $value) {
			$top = $this->_graphTop + $this->_graphHeight
				- round((($value-$min)/($max-$min))*$this->_graphHeight);
			$this->draw_marker($left,$top);

			if ($this->_connected)
				if ($lastLeft)
					$this->draw_line($lastLeft,$lastTop,$left,$top);

			$lastLeft = $left; $lastTop = $top;
			$left += $dwidth;
		}
	}
	function draw_marker($left,$top) {
		switch ($this->_marker) {
			case "diamond":
				$values = array(
					$left, $top+$this->_markerSize/2,
					$left+$this->_markerSize/2, $top,
					$left, $top-$this->_markerSize/2,
					$left-$this->_markerSize/2, $top,
				);
				ImageFilledPolygon(
					$this->_image->_image,
					$values, 4,
					$this->_mcolor
				);
				break;
			default:
				ImageFilledEllipse (
					$this->_image->_image,
					$left, $top,
					$this->_markerSize, $this->_markerSize,
					$this->_mcolor
				);
				break;
		}
	}
	function draw_line($lastLeft,$lastTop,$left,$top) {
		ImageLine (
			$this->_image->_image,
			$lastLeft, $lastTop,
			$left, $top,
			$this->_lcolor
		);
	}
	#
	# Compute the center and size
	#
	function compute() {
		list(
			$this->_graphLeft, $this->_graphTop,
			$this->_graphWidth, $this->_graphHeight
		) = $this->_image->get_graph_area();

	}
}

?>