<?php

class pmGauge
{
    /**
     * width
     */
    var $w = 610;

    /**
     * height
     */
    var $h = 300;

    /**
     * value of gauge
     */
    var $value = 50;

    /**
     * maxValue
     */
    var $maxValue = 100;

    /**
     * redFrom
     */
    var $redFrom = 80;

    /**
     * redTo
     */
    var $redTo = 100;

    /**
     * yellowFrom
     */
    var $yellowFrom = 60;

    /**
     * yellowTo
     */
    var $yellowTo = 80;

    /**
     * greenFrom
     */
    var $greenFrom = 0;

    /**
     * greenTo
     */
    var $greenTo = 60;

    /**
     * centerLabel, the label in the middle of the gauge
     */
    var $centerLabel = '';

    function render ()
    {
        $this->h = $this->w / 2;
        $im = imagecreatetruecolor( $this->w, $this->h );
        $width = $this->w;
        $height = $this->h;
        $center_x = intval( $width / 2 );
        $center_y = intval( $height / 2 );

        //gauge color
        $bgcolor = ImageColorAllocate( $im, 247, 247, 247 );
        $extRing = ImageColorAllocate( $im, 214, 214, 214 );
        $blueRing = ImageColorAllocate( $im, 70, 132, 238 );
        $blueRingLine = ImageColorAllocate( $im, 106, 114, 127 );
        $arrowBody = ImageColorAllocate( $im, 228, 114, 86 );
        $arrowLine = ImageColorAllocate( $im, 207, 74, 42 );
        $redArc = ImageColorAllocate( $im, 220, 57, 18 );
        $yellowArc = ImageColorAllocate( $im, 255, 153, 0 );

        $black = ImageColorAllocate( $im, 0, 0, 0 );
        $white = ImageColorAllocate( $im, 255, 255, 255 );
        $gray = ImageColorAllocate( $im, 190, 190, 190 );

        $fontArial = PATH_THIRDPARTY . 'html2ps_pdf/fonts/arial.ttf';

        ImageFilledRectangle( $im, 0, 0, $width - 1, $height - 1, $white );
        ImageRectangle( $im, 0, 0, $width - 1, $height - 1, $gray );

        //center coords
        $cX = intval( $this->w / 2 );
        //$cX = intval($this->w /4);
        $cY = intval( $this->h / 2 );

        //diameter for gauge
        $diameter = intval( $this->h * 4 / 5 );

        $this->renderGauge( $im, $cX, $cY, $diameter );

        /*
         //center coords
         $cX = intval($this->w * 3/4);
         $cY = intval($this->h /2);

         //diameter for gauge
         $diameter = intval( $this->h * 4/5 );

         $this->renderGauge($im, $cX, $cY, $diameter);
         */
        Header( "Content-type: image/png" );
        ImagePng( $im );

    }

    function renderGauge ($im, $cX, $cY, $diameter)
    {
        //gauge color
        $bgcolor = ImageColorAllocate( $im, 247, 247, 247 );
        $extRing = ImageColorAllocate( $im, 214, 214, 214 );
        $blueRing = ImageColorAllocate( $im, 70, 132, 238 );
        $blueRingLine = ImageColorAllocate( $im, 106, 114, 127 );
        $arrowBody = ImageColorAllocate( $im, 228, 114, 86 );
        $arrowLine = ImageColorAllocate( $im, 207, 74, 42 );
        $redArc = ImageColorAllocate( $im, 220, 57, 18 );
        $yellowArc = ImageColorAllocate( $im, 255, 153, 0 );
        $greenArc = ImageColorAllocate( $im, 0, 136, 0 );

        $black = ImageColorAllocate( $im, 0, 0, 0 );
        $white = ImageColorAllocate( $im, 255, 255, 255 );
        $gray = ImageColorAllocate( $im, 190, 190, 190 );

        $fontArial = PATH_THIRDPARTY . 'html2ps_pdf/fonts/arial.ttf';

        $dX = intval( $diameter * 8 / 7 ); //for now ratio aspect is 8:7
        $dY = intval( $diameter );
        $dXRing = intval( $dX * 0.90 );
        $dYRing = intval( $dY * 0.90 );

        $dXRingColor = intval( $dX * 0.86 );
        $dYRingColor = intval( $dY * 0.86 );

        $dXRingCenter = intval( $dX * 0.66 );
        $dYRingCenter = intval( $dY * 0.66 );

        imagefilledellipse( $im, $cX, $cY, $dX, $dY, $extRing );

        imagefilledellipse( $im, $cX, $cY, $dXRing, $dYRing, $bgcolor );

        //drawing the red arc
        if ($this->redFrom > $this->maxValue) {
            $this->redFrom = $this->maxValue;
        }
        if ($this->redTo > $this->maxValue) {
            $this->redTo = $this->maxValue;
        }
        if ($this->yellowFrom > $this->maxValue) {
            $this->yellowFrom = $this->maxValue;
        }
        if ($this->yellowTo > $this->maxValue) {
            $this->yellowTo = $this->maxValue;
        }
        if ($this->greenFrom > $this->maxValue) {
            $this->greenFrom = $this->maxValue;
        }
        if ($this->greenTo > $this->maxValue) {
            $this->greenTo = $this->maxValue;
        }

        $redFrom = $this->redFrom / $this->maxValue * 300 - 240;
        $redTo = $this->redTo / $this->maxValue * 300 - 240;
        $yellowFrom = $this->yellowFrom / $this->maxValue * 300 - 240;
        $yellowTo = $this->yellowTo / $this->maxValue * 300 - 240;
        $greenFrom = $this->greenFrom / $this->maxValue * 300 - 240;
        $greenTo = $this->greenTo / $this->maxValue * 300 - 240;

        if ($this->redFrom != $this->redTo || $this->redTo != $this->maxValue) {
            imagefilledarc( $im, $cX, $cY, $dXRingColor, $dYRingColor, $redFrom, $redTo, $redArc, IMG_ARC_PIE );
        }
        if ($this->yellowFrom != $this->yellowTo || $this->yellowTo != $this->maxValue) {
            imagefilledarc( $im, $cX, $cY, $dXRingColor, $dYRingColor, $yellowFrom, $yellowTo, $yellowArc, IMG_ARC_PIE );
        }
        if ($this->greenFrom != $this->greenTo || $this->greenTo != $this->maxValue) {
            imagefilledarc( $im, $cX, $cY, $dXRingColor, $dYRingColor, $greenFrom, $greenTo, $greenArc, IMG_ARC_PIE );
        }
        imagefilledellipse( $im, $cX, $cY, $dXRingCenter, $dYRingCenter, $bgcolor );

        //ticks
        $radiusX = intval( $dX * 0.42 );
        $radiusY = intval( $dY * 0.42 );
        $min = 5;
        while ($min <= 55) {
            if ($min % 5 == 0) {
                $len = $radiusX / 8;
            } else {
                $len = $radiusX / 25;
            }

            $ang = (2 * M_PI * $min) / 60;
            $x1 = sin( $ang ) * ($radiusX - $len) + $cX;
            $y1 = cos( $ang ) * ($radiusY - $len) + $cY;
            $x2 = sin( $ang ) * $radiusX + $cX;
            $y2 = cos( $ang ) * $radiusY + $cY;

            ImageLine( $im, $x1, $y1, $x2, $y2, $black );

            if ($min % 5 == 0) {
                $textToDisplay = sprintf( "%d", (55 - $min) * $this->maxValue / 50 );
                $bbox = imagettfbbox( 8, 0, $fontArial, $textToDisplay );
                $x1 = sin( $ang ) * ($radiusX - 2.5 * $len) + $cX - $bbox[4] / 2;
                $y1 = cos( $ang ) * ($radiusY - 2.5 * $len) + $cY + 2; // - abs($bbox[5]);
                imagettftext( $im, 8, 0, $x1, $y1, $gray, $fontArial, $textToDisplay );
            }
            $min ++;
        }

        if (trim( $this->centerLabel ) != '') {
            $textToDisplay = trim( $this->centerLabel );
            $bbox = imagettfbbox( 8, 0, $fontArial, $textToDisplay );
            $x1 = $cX - $bbox[4] / 2;
            $y1 = $cY * 3 / 4 + abs( $bbox[5] );
            imagettftext( $im, 8, 0, $x1, $y1, $black, $fontArial, $textToDisplay );
        }

        imagettftext( $im, 9, 0, $cX * 0.60, $cY * 1.8, $gray, $fontArial, $this->open );
        imagettftext( $im, 9, 0, $cX * 1.40, $cY * 1.8, $gray, $fontArial, $this->completed );

        //drawing the arrow, simple way
        $radiusX = intval( $dX * 0.35 );
        $radiusY = intval( $dY * 0.35 );

        $ang = - M_PI / 6 + 2 * M_PI - (2 * M_PI * $this->value) * 50 / 60 / $this->maxValue;
        $x1 = sin( $ang ) * ($radiusX) + $cX;
        $y1 = cos( $ang ) * ($radiusY) + $cY;
        ImageLine( $im, $cX, $cY, $x1, $y1, $arrowLine );

        /*
         //arrowLine
         $arrowHeight = intval($dY * 0.02);
         $arrowWidth  = intval($dX * 0.35);
         $arrowTail   = intval($dX * 0.15);
         $values = array(
              0, -$arrowHeight,
              -$arrowTail,  0,
              0, $arrowHeight,
              $arrowWidth, 0,
              0, -$arrowHeight
         );

         //rotate n degrees
         $n = 20;
         $ang = (2 * M_PI * $n) / 60;

         foreach ( $values as $k => $val ) {
            if ( $k % 2 == 0 ) {
            //$values[$k] = sin($ang)*$val + 20;
            $values[$k] = sin($ang)*($val/$cX)*$;
            $values[$k] += $cX;
         }
          else {
            //$ys = intval(sin($sec * M_PI/30 - M_PI/2) * R);
            //$values[$k] = intval(sin($n *  M_PI/30 - M_PI/2) *$val);
            $values[$k] = (cos($ang))*($val/$cY)*$cY;
            $values[$k] += $cY;
         }
         }

          imagefilledpolygon  ($im, $values, 5, $arrowBody);
          imagepolygon        ($im, $values, 5, $arrowLine);
          */
          //blue ring
        $dXBlueRing = $dX * 0.07;
        $dYBlueRing = $dY * 0.07;
        imagefilledellipse( $im, $cX, $cY, $dXBlueRing, $dXBlueRing, $blueRing );
        imageellipse( $im, $cX, $cY, $dXBlueRing, $dYBlueRing, $blueRingLine );

        imageellipse( $im, $cX, $cY, $dX, $dY, $black );

        $textToDisplay = sprintf( "%5.2f%%", $this->value );
        $bbox = imagettfbbox( 9, 0, $fontArial, $textToDisplay );
        $centerX = $cX - $bbox[4] / 2;
        $centerY = $cY + $dYRing / 2 + 3 - abs( $bbox[5] );
        imagettftext( $im, 9, 0, $centerX, $centerY, $black, $fontArial, $textToDisplay );

    }
}