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<?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 1.1 2004/06/15 10:13:19 jpm Exp $

//

// License:	This code is released under QPL

// Copyright (C) 2001,2002 Johan Persson

//========================================================================

*/

//===================================================

// 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) = $f($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 */

?>