SmolGraph2PHP
Posted by Anonymous on Wed 1st Aug 2018 01:27
raw | new post

<?
class smolGraph
{
        //Used for making a small graph on a bigger one.
        public $physicalWidth;
        public $physicalHeight;

        //what is the incoming data going to look like
        public $minValueX;
        public $maxValueX;
        public $minValueY;
        public $maxValueY;

        //Where does it live physicall on the screen
        public $startX;
        public $widthX;
        public $startY;
        public $heightY;

        //cartesian center relative to the X Y of physical screen
        public $cartCenterX;
        public $cartCenterY;

        function svgHeader()
        {
                $SVGDOCUMENT="";
                $GRAPHWIDTH=$this->physicalWidth;
                $GRAPHHEIGHT=$this->physicalHeight;
                $SVGDOCUMENT.="<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"".$GRAPHWIDTH."\"  height=\"".$GRAPHHEIGHT."\"  >\n";
                $SVGDOCUMENT.="<rect x=\"0\" y=\"0\" width=\"".$GRAPHWIDTH."\" height=\"".$GRAPHHEIGHT."\"  style=\"fill:white; stroke-width:3;stroke:rgb(0,0,0)\"/>\n";
                //echo "[$SVGDOCUMENT]\n";
                return $SVGDOCUMENT;
        }
        function svgFooter()
        {
                return "</svg>\n";
        }
        function graphLine($x,$y,$h,$v,$width,$color)
        {
                $x1=$this->map($x,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $x2=$this->map($h,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $y1=$this->map($y,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $y2=$this->map($v,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $SVGDOCUMENT="<line x1=\"$x1\" y1=\"$y1\" x2=\"$x2\" y2=\"$y2\" style=\"stroke:$color;stroke-width:$width;\" />\n";
                return $SVGDOCUMENT;
        }
        function graphRectangle($x,$y,$h,$v,$color)
        {
                $SVGDOCUMENT="";

                $x1=$this->map($x,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $x2=$this->map($h,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $y1=$this->map($y,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $y2=$this->map($v,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $SVGDOCUMENT.="<polygon points=\"$x1,$y1 $x2,$y1 $x2,$y2 $x1,$y2 \" style=\"fill:$color;\" />\n";
                return $SVGDOCUMENT;
        }
        function graphCircle($x,$y,$radius,$color)
        {
                $SVGDOCUMENT="";

                $x1=$this->map($x,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $y1=$this->map($y,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $SVGDOCUMENT.="<circle cx=\"$x1\" cy=\"$y1\" r=\"$radius\" fill=\"$color\" />\n";
                return $SVGDOCUMENT;
        }
        function graphText($textValue,$x,$y,$color,$size)
        {
                $SVGDOCUMENT="";
                $x1=$this->map($x,$this->minValueX,$this->maxValueX,$this->startX,$this->startX+$this->widthX)-($this->cartCenterX);
                $y1=$this->map($y,$this->minValueY,$this->maxValueY,$this->startY+$this->heightY,$this->startY)+$this->cartCenterY;
                $y1=$y1+($size/3);
                $SVGDOCUMENT.="<text x=\"$x1\" y=\"$y1\" fill=\"$color\" font-face=\"sans\" font-size=\"$size\">$textValue</text>\n";
                return $SVGDOCUMENT;
        }
        function map($value, $fromLow, $fromHigh, $toLow, $toHigh)
        {
                $fromRange = $fromHigh - $fromLow;
                $toRange = $toHigh - $toLow;
                $scaleFactor = $toRange / $fromRange;
                $tmpValue = $value - $fromLow;
                $tmpValue *= $scaleFactor;
                return $tmpValue + $toLow;
        }
        function degreesToRadians($degrees)
        {
                $radians=(pi()/180)*$degrees;
                return $radians;
        }
        function radiansToDegrees($radians)
        {
                $degrees=$radians*(180/pi());
                return $degrees;
        }
}

        $AGraph=new smolGraph();

        $AGraph->physicalWidth=1000;
        $AGraph->physicalHeight=1000;

        $AGraph->minValueX=-100;
        $AGraph->maxValueX=100;
        $AGraph->minValueY=-100;
        $AGraph->maxValueY=100;

        $AGraph->startX=100;
        $AGraph->startY=100;
        $AGraph->widthX=200;
        $AGraph->heightY=200;

        $AGraph->cartCenterX=0;
        $AGraph->cartCenterY=0;

        $retV="";
        $retV.=$AGraph->svgHeader();
   //grid X
    for ($x=$AGraph->minValueX; $x<$AGraph->maxValueX+1; $x+=10)
    {
                $retV.=$AGraph->graphLine($x,$AGraph->minValueY,$x,$AGraph->maxValueY,1.0,"#888888");
        }

   //grid Y
    for ($y=$AGraph->minValueY; $y<$AGraph->maxValueY+1; $y+=10)
    {
                $retV.=$AGraph->graphLine($AGraph->minValueX,$y,$AGraph->maxValueX,$y,1.0,"#888888");
        }

        $retV.=$AGraph->graphLine(-100,0,100,0,2,"#444444");
        $retV.=$AGraph->graphLine(0,-100,0,100,2,"#444444");

        $retV.=$AGraph->graphLine(0,0,100,100,2,"#882222");
        $retV.=$AGraph->graphLine(0,0,100,-100,2,"#228822");

        $retV.=$AGraph->graphRectangle(-50,-50,50,50,"#222288");
        $retV.=$AGraph->graphCircle(50,50,10,"#440000");

        $retV.=$AGraph->graphText("Hello Graph",0,0,"#000000",12);
        $retV.=$AGraph->graphText("Hello Graph",-100,-110,"#000000",15);

        $retV.=$AGraph->svgFooter();
        file_put_contents("/tmp/misc/test.svg", $retV);


//generates a small graph within a larger screen.
//the graph is auto scaled
?>