Remove unused class eqGraph
This commit is contained in:
Brian Miyaji
@@ -420,187 +420,4 @@ class eqEOS {
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} //end function solveIF
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} //end function solveIF
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} //end class 'eqEOS'
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} //end class 'eqEOS'
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// fun class that requires the GD libraries to give visual output to the user
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/* extends the eqEOS class so that it doesn't need to create it as a private var
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- and it extends the functionality of that class */
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/**
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* Equation Graph
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*
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* Fun class that requires the GD libraries to give visual output of an
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* equation to the user. Extends the eqEOS class.
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*
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* @author Jon Lawrence <jlawrence11@gmail.com>
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* @copyright Copyright <20>2005-2013 Jon Lawrence
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* @license http://opensource.org/licenses/LGPL-2.1 LGPL 2.1 License
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* @package Math
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* @subpackage EOS
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* @version 2.0
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*/
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if ( ! class_exists( 'eqGraph' ) ):
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class eqGraph extends eqEOS {
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private $width;
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private $height;
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//GD Image reference
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private $image;
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/**
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* Constructor
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*
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* Sets up the Graph class with an image width and height defaults to
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* 640x480
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*
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* @param Integer $width Image width
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* @param Integer $height Image height
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*/
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public function __construct($width=640, $height=480) {
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// default width and height equal to that of a poor monitor (in early 2000s)
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$this->width = $width;
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$this->height = $height;
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//initialize main class variables
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parent::__construct();
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} //end function eqGraph
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/**
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* Create GD Graph Image
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*
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* Creates a GD image based on the equation given with the parameters that are set
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*
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* @param String $eq Equation to use. Needs variable in equation to create graph, all variables are interpreted as 'x'
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* @param Integer $xLow Lower x-bound for graph
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* @param Integer $xHigh Upper x-bound for graph
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* @param Float $xStep Stepping points while solving, the lower, the better precision. Slow if lower than .01
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* @param Boolean $xyGrid Draw gridlines?
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* @param Boolean $yGuess Guess the upper/lower yBounds?
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* @param Integer $yLow Lower y-bound
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* @param Integer $yHigh Upper y-bound
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* @return Null
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*/
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public function graph($eq, $xLow, $xHigh, $xStep, $xyGrid = false, $yGuess = true, $yLow=false, $yHigh=false) {
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//create our image and allocate the two colors
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$img = ImageCreate($this->width, $this->height);
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$white = ImageColorAllocate($img, 255, 255, 255);
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$black = ImageColorAllocate($img, 0, 0, 0);
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$grey = ImageColorAllocate($img, 220, 220, 220);
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$xStep = abs($xStep);
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//DEVELOPER, UNCOMMENT NEXT LINE IF WANTING TO PREVENT SLOW GRAPHS
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//$xStep = ($xStep > .01) ? $xStep : 0.01;
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if($xLow > $xHigh)
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list($xLow, $xHigh) = array($xHigh, $xLow); //swap function
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$xScale = $this->width/($xHigh-$xLow);
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$counter = 0;
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for($i=$xLow;$i<=$xHigh;$i+=$xStep) {
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$tester = sprintf("%10.3f",$i);
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if($tester == "-0.000") $i = 0;
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$y = $this->solveIF($eq, $i);
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// If developer asked us to find the upper and lower bounds for y...
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if($yGuess==true) {
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$yLow = ($yLow===false || ($y<$yLow)) ? $y : $yLow;
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$yHigh = ($yHigh===false || $y>$yHigh) ? $y : $yHigh;
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}
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$xVars[$counter] = $y;
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$counter++;
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}
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// add 0.01 to each side so that if y is from 1 to 5, the lines at 1 and 5 are seen
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$yLow-=0.01;$yHigh+=0.01;
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//Now that we have all the variables stored...find the yScale
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$yScale = $this->height/(($yHigh)-($yLow));
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// if developer wanted a grid on the graph, add it now
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if($xyGrid==true) {
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for($i=ceil($yLow);$i<=floor($yHigh);$i++) {
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$i0 = abs($yHigh-$i);
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ImageLine($img, 0, $i0*$yScale, $this->width, $i0*$yScale, $grey);
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}
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for($i=ceil($xLow);$i<=floor($xHigh);$i++) {
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$i0 = abs($xLow-$i);
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ImageLine($img, $i0*$xScale, 0, $i0*$xScale, $this->height, $grey);
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}
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}
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//Now that we have the scales, let's see if we can draw an x/y-axis
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if($xLow <= 0 && $xHigh >= 0) {
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//the y-axis is within our range - draw it.
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$x0 = abs($xLow)*$xScale;
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ImageLine($img, $x0, 0, $x0, $this->height, $black);
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for($i=ceil($yLow);$i<=floor($yHigh);$i++) {
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$i0 = abs($yHigh-$i);
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ImageLine($img, $x0-3, $i0*$yScale, $x0+3, $i0*$yScale, $black);
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}
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}
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if($yLow <= 0 && $yHigh >= 0) {
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//the x-axis is within our range - draw it.
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$y0 = abs($yHigh)*$yScale;
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ImageLine($img, 0, $y0, $this->width, $y0, $black);
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for($i=ceil($xLow);$i<=floor($xHigh);$i++) {
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$i0 = abs($xLow-$i);
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ImageLine($img, $i0*$xScale, $y0-3, $i0*$xScale, $y0+3, $black);
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}
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}
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$counter=2;
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//now graph it all ;]
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for($i=$xLow+$xStep;$i<=$xHigh;$i+=$xStep) {
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$x1 = (abs($xLow - ($i - $xStep)))*$xScale;
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$y1 = (($xVars[$counter-1]<$yLow) || ($xVars[$counter-1] > $yHigh)) ? -1 : (abs($yHigh - $xVars[$counter-1]))*$yScale;
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$x2 = (abs($xLow - $i))*$xScale;
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$y2 = (($xVars[$counter]<$yLow) || ($xVars[$counter] > $yHigh)) ? -1 : (abs($yHigh - $xVars[$counter]))*$yScale;
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// if any of the y values were found to be off of the y-bounds, don't graph those connecting lines
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if($y1!=-1 && $y2!=-1)
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ImageLine($img, $x1, $y1, $x2, $y2, $black);
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$counter++;
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}
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$this->image = $img;
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} //end function 'graph'
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/**
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* Sends JPG to browser
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*
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* Sends a JPG image with proper header to output
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*/
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public function outJPG() {
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header("Content-type: image/jpeg");
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ImageJpeg($this->image);
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}
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/**
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* Sends PNG to browser
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*
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* Sends a PNG image with proper header to output
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*/
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function outPNG() {
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header("Content-type: image/png");
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ImagePng($this->image);
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}
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/**
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* Output GD Image
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*
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* Will give the developer the GD resource for the graph that
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* can be used to store the graph to the FS or other media
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*
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* @return Resource GD Image Resource
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*/
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public function getImage() {
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return $this->image;
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}
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/**
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* Output GD Image
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*
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* Alias for eqGraph::getImage()
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*
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* @return Resource GD Image resource
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*/
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public function outGD() {
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return $this->getImage();
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}
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} //end class 'eqGraph'
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endif;
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?>
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?>
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