<?php 
/*=======================================================================
// File:	JPGRAPH_SCATTER.PHP
// Description: Scatter (and impuls) plot extension for JpGraph
// Created: 	2001-02-11
// Author:	Johan Persson (johanp@aditus.nu)
// Ver:		$Id: jpgraph_scatter.php,v 1.3 2004/10/06 09:02:05 jack Exp $
//
// License:	This code is released under QPL
// Copyright (C) 2001,2002 Johan Persson
//========================================================================
*/
require_once ('jpgraph_plotmark.inc');

//===================================================
// CLASS FieldArrow
// Description: Draw an arrow at (x,y) with angle a
//===================================================
class FieldArrow {
    var $iSize=10;  // Length in pixels for  arrow
    var $iArrowSize = 2;
    var $iColor='black';
    var $isizespec = array(
	array(2,1),array(3,2),array(4,3),array(6,4),array(7,4),array(8,5),array(10,6),array(12,7),array(16,8),array(20,10));
    function FieldArrow() {
    }

    function SetSize($aSize,$aArrowSize=2) {
	$this->iSize = $aSize;
	$this->iArrowSize = $aArrowSize;
    }

    function SetColor($aColor) {
	$this->iColor = $aColor;
    }

    function Stroke($aImg,$x,$y,$a) {
	$old_origin = $aImg->SetCenter($x,$y);
	$old_a = $aImg->SetAngle(-$a);

	$dx = round($this->iSize/2);
	$c = array($x-$dx,$y,$x+$dx,$y);
	$x += $dx;

	list($dx,$dy) = $this->isizespec[$this->iArrowSize];
	$ca = array($x,$y,$x-$dx,$y-$dy,$x-$dx,$y+$dy,$x,$y);

	$aImg->SetColor($this->iColor);
	$aImg->Polygon($c);
	$aImg->FilledPolygon($ca);

	$aImg->SetCenter($old_origin[0],$old_origin[1]);
	$aImg->SetAngle($old_a);
    }
}

//===================================================
// CLASS FieldPlot
// Description: Render a field plot
//===================================================
class FieldPlot extends Plot {
    var $iAngles;
    var $iCallback='';
    function FieldPlot($datay,$datax,$angles) {
	if( (count($datax) != count($datay)) )
	    JpGraphError::Raise("Fieldplots must have equal number of X and Y points.");
	if( (count($datax) != count($angles)) )
	    JpGraphError::Raise("Fieldplots must have an angle specified for each X and Y points.");
	
	$this->iAngles = $angles;

	$this->Plot($datay,$datax);
	$this->value->SetAlign('center','center');
	$this->value->SetMargin(15);

	$this->arrow = new FieldArrow();
    }

    function SetCallback($aFunc) {
	$this->iCallback = $aFunc;
    }

    function Stroke(&$img,&$xscale,&$yscale) {

	// Remeber base color and size
	$bc = $this->arrow->iColor;
	$bs = $this->arrow->iSize;
	$bas = $this->arrow->iArrowSize;

	for( $i=0; $i<$this->numpoints; ++$i ) {
	    // Skip null values
	    if( $this->coords[0][$i]==="" )
		continue;

	    $f = $this->iCallback;
	    if( $f != "" ) {
		list($cc,$cs,$cas) = call_user_func($f,$this->coords[1][$i],$this->coords[0][$i],$this->iAngles[$i]);
		// Fall back on global data if the callback isn't set
		if( $cc  == "" ) $cc = $bc;
		if( $cs  == "" ) $cs = $bs;
		if( $cas == "" ) $cas = $bas;
		//echo "f=$f, cc=$cc, cs=$cs, cas=$cas<br>";
		$this->arrow->SetColor($cc);	    
		$this->arrow->SetSize($cs,$cas);
	    }

	    $xt = $xscale->Translate($this->coords[1][$i]);
	    $yt = $yscale->Translate($this->coords[0][$i]);	

	    $this->arrow->Stroke($img,$xt,$yt,$this->iAngles[$i]);
	    $this->value->Stroke($img,$this->coords[0][$i],$xt,$yt);
	}
    }
	
    // Framework function
    function Legend(&$aGraph) {
	if( $this->legend != "" ) {
	    $aGraph->legend->Add($this->legend,$this->mark->fill_color,$this->mark,0,
				 $this->legendcsimtarget,$this->legendcsimalt);
	}
    }	
}

//===================================================
// CLASS ScatterPlot
// Description: Render X and Y plots
//===================================================
class ScatterPlot extends Plot {
    var $impuls = false;
    var $linkpoints = false, $linkpointweight=1, $linkpointcolor="black";
//---------------
// CONSTRUCTOR
    function ScatterPlot($datay,$datax=false) {
	if( (count($datax) != count($datay)) && is_array($datax))
	    JpGraphError::Raise("Scatterplot must have equal number of X and Y points.");
	$this->Plot($datay,$datax);
	$this->mark = new PlotMark();
	$this->mark->SetType(MARK_SQUARE);
	$this->mark->SetColor($this->color);
	$this->value->SetAlign('center','center');
	$this->value->SetMargin(0);
    }

//---------------
// PUBLIC METHODS	
    function SetImpuls($f=true) {
	$this->impuls = $f;
    }   

    // Combine the scatter plot points with a line
    function SetLinkPoints($aFlag=true,$aColor="black",$aWeight=1) {
	$this->linkpoints=$aFlag;
	$this->linkpointcolor=$aColor;
	$this->linkpointweight=$aWeight;
    }

    function Stroke(&$img,&$xscale,&$yscale) {

	$ymin=$yscale->scale_abs[0];
	if( $yscale->scale[0] < 0 )
	    $yzero=$yscale->Translate(0);
	else
	    $yzero=$yscale->scale_abs[0];
	    
	$this->csimareas = '';
	for( $i=0; $i<$this->numpoints; ++$i ) {

	    // Skip null values
	    if( $this->coords[0][$i]==="" )
		continue;

	    if( isset($this->coords[1]) )
		$xt = $xscale->Translate($this->coords[1][$i]);
	    else
		$xt = $xscale->Translate($i);
	    $yt = $yscale->Translate($this->coords[0][$i]);	


	    if( $this->linkpoints && isset($yt_old) ) {
		$img->SetColor($this->linkpointcolor);
		$img->SetLineWeight($this->linkpointweight);
		$img->Line($xt_old,$yt_old,$xt,$yt);
	    }

	    if( $this->impuls ) {
		$img->SetColor($this->color);
		$img->SetLineWeight($this->weight);
		$img->Line($xt,$yzero,$xt,$yt);
	    }
	
	    if( !empty($this->csimtargets[$i]) ) {
	        $this->mark->SetCSIMTarget($this->csimtargets[$i]);
	        $this->mark->SetCSIMAlt($this->csimalts[$i]);
	    }
	    
	    if( isset($this->coords[1]) ) {
		$this->mark->SetCSIMAltVal($this->coords[0][$i],$this->coords[1][$i]);
	    }
	    else {
		$this->mark->SetCSIMAltVal($this->coords[0][$i],$i);
	    }

	    $this->mark->Stroke($img,$xt,$yt);
	
	    $this->csimareas .= $this->mark->GetCSIMAreas();
	    $this->value->Stroke($img,$this->coords[0][$i],$xt,$yt);

	    $xt_old = $xt;
	    $yt_old = $yt;
	}
    }
	
    // Framework function
    function Legend(&$aGraph) {
	if( $this->legend != "" ) {
	    $aGraph->legend->Add($this->legend,$this->mark->fill_color,$this->mark,0,
				 $this->legendcsimtarget,$this->legendcsimalt);
	}
    }	
} // Class
/* EOF */
?>