Jpgraph Scatter.php:
<?php
/*=======================================================================
// File: JPGRAPH_SCATTER.PHP
// Description: Scatter (and impuls) plot extension for JpGraph
// Created: 2001-02-11
// Author: Johan Persson (johanp <at> aditus <dot> nu)
// Ver: $Id: jpgraph_scatter.php, v 1.28 2002/12/15 16:22:06 aditus 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]);
}
// We need to set the value since we need to save the Y-value
// in the mark value property.
$this->mark->SetCSIMAltVal($this->coords[0][$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 */
?>
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