grafik

<?php

$res = array();
$i = (float) -15.0;

        $i = (float) -15.0;
        while ($i < 360 ) {
            $i2=deg2rad($i)*2;
            $n = abs( sin($i2) )* 50;//$i*6 + 7  ;
            //$i0=(string)$i;
            $res[] = array($i, $n);
            $i += .1;
            //echo $n;
        }
        //echo_r($res);die;

        ksort($res);
        $minX = $minY = $maxX = $maxY = 0;
        foreach ($res as $row) {
            $x = $row[0];
            $y = $row[1];
            if ($minX > $x) {
                $minX = $x;
            }
            if ($minY > $y) {
                $minY = $y;
            }
            //===========max
            if ($maxX < $x) {
                $maxX = $x;
            }
            if ($maxY < $y) {
                $maxY = $y;
            }
        }

        $lenX = $maxX - $minX;
        $lenY = $maxY - $minY;

        $size =$size0= 500;
        $mulX = round($size / $lenX);
        $mulY = round($size / $lenY);
        $border = 20;
        $config = array(
            'x' => array($minX, $maxX, $lenX),
            'y' => array($minY, $maxY, $lenY),
            'mul' => array($mulX, $mulY),
            'data' => $res,
            'size' => array(500, 500),
            'border' => $border
        );
        //echo_r($res);
        //echo_r($config);
        $line = generate_line($config);

        //echo_r($line);die;
        $size += ($border * 3);
        $img = imagecreatetruecolor($size, $size);
        $white = imagecolorallocate($img, 255, 255, 255);
        $black = imagecolorallocate($img, 0, 0, 0);
        $gray = imagecolorallocate($img, 125, 0, 125);

        imagefilledrectangle($img, 0, 0, $size, $size, $white);
        //line x
        imageline($img, $border, $line['yLine'], ($border+$size0), $line['yLine'], $gray);
        //line y
        imageline($img, $line['xLine'], $border, $line['xLine'], ($border+$size0), $gray);

        foreach ($line['line'] as $n => $pos) {
            if ($n != 0) {
                $x0 = $line['line'][$n - 1][0];
                $y0 = $line['line'][$n - 1][1];
                imageline($img, $x0, $y0, $pos[0], $pos[1], $black);
            }
        }
        header("Content-type: image/png");
        //imageline($palette, $startx, $starty, $endx, $endy, $colour)

        imagepng($img);
        die;


    function params_exist($params, $key, $default = FALSE) {
        if (isset($params[$key])) {
            return $params[$key];
        }
        if (is_array($params)) {
            log_local('params_exist key (' . $key . ' ?):' . json_encode(array_keys($params)));
        } else {
            log_local('params_exist (' . $key . ' ?) key:' . print_r($params, 1));
        }
        return $default;
    }


    function generate_line($params = FALSE) {
        $result = array(
            'xLine'=>0,
            'yLine'=>0
        );
        $result[]=$params;
        $size = params_exist($params, 'size', array(500, 500));
        $x = params_exist($params, 'x', array(0, 10));
        $y = params_exist($params, 'y', array(0, 10));
        $data = params_exist($params, 'data', FALSE);
        $border = params_exist($params, 'border', 11);

        $lenX = $x[1] - $x[0];
        $lenY = $y[1] - $y[0];
        $mulX = round($size[0] / $lenX);
        $mulY = round($size[1] / $lenY);
        $result[] = array($mulX, $mulY);
        foreach ($data as $row ) { //$pos_x => $pos_y
            $pos_x=$row[0];
            $pos_y=$row[1];
            $pos_x1 = $border + ( ($pos_x + abs($x[0]) ) * $mulX);
            $pos_y1 = $border + ( ($y[1] - $pos_y) * $mulY);
            //( ($pos_y-$y[1]) * $mulY);
            $line[ ] = array($pos_x1, $pos_y1);
        }

        $result['xLine']= $border + (abs($x[0])*$mulX);
        $result['yLine']= $border + (abs($y[1])*$mulY);
        $result['line'] = $line;
        return $result;
    }