用PHP生成图表

功能还比较简单,有兴趣可以随便扩展

<?php
class MultiGraph{
    public $border_color;
    public $grid_color;
    public $data_color;
    public $g;
    public $data;
    public $draw_border=true;
    public $horizontal_grid_segments=5;
    public $vertical_grid_segments=0;
    public $x=0;
    public $y=0;
    public $w=200;
    public $h=100;
    public $point_size=5;
    public $y_axis_autolabel=true;
    public $x_axis_autolabel=true;
    public $font='arial.ttf';
    public $fontsize=8;
    public function __construct($graphics){
        $this->g=$graphics;
        imageantialias($this->g,true);
    }
    public function setDimensions($x,$y,$w,$h){
        $this->x=$x;
        $this->y=$y;
        $this->w=$w;
        $this->h=$h;
    }
    public function drawLineGraph(){
        $this->_drawborder();
        $yscale=$this->_calcYscale();
        $xscale=$this->_calcXscale();
        $this->_drawHorizontal();
        $this->_drawVertical();
        $tmpdata=$this->data;
        ksort($tmpdata);
        list($ldx,$ldy)=each($tmpdata);
        while (list($dx,$dy)=each($tmpdata)) {
            imageline($this->g,
                $this->x+$ldx*$xscale,
                $this->y+$this->y-$ldx*$yscale,
                $this->x+$dx*$xscale,
                $this_>y+$this->y-$dy*$yscale,
                $this->data_color);
            $ldx=$dx;
            $ldy=$dy;
        }
    }
    public function drawPointGraph(){
        $this->_drawBorder();
        $yscale=$this->_calcYscale();
        $xscale=$this->_calcXscale();
        $this->_drawHorizontal();
        $this->_drawVertical();
        foreach ($this->data as $dx=>$dy){
            imagefilledellipse($this->g,
                $this->x+$dx*$xscale,
                $this->y+$this->h-$dy*$yscale,
                $this->point_size,
                $this->point_size,
                $this->data_color);
        }
    }
    public function drawBarGraph(){
        $this->_drawBorder();
        $yscale=$this->_calcYscale();
        $this->_drawHorizontal();
        $section=(float)$this->w/count($this->data);
        $bar=(int)($section*0.7);
        $count=0;
        foreach ($this->data as $label=>$val){
            $count++;
            imagefilledrectangle($this->g,
                $this->x+($section*$count)-$bar,
                $this->y+$this->h,
                $this->x+($section*$count),
                $this->y+$this->h-$val*$yscale,
                $this->data_color);
            imagerectangle($this->g,
                $this-x+($section*$count)-$bar,
                $this->y+$this->h,
                $this->x+($section*$count),
                $this->y+$this->h-$val*$yscale,
                $this->border_color);
            if ($this->x_axis_autolabel) {
                $box=imagettfbbox($this->fontsize,270,$this->font,$label);
                $texwidth=abs($box[4]-$box[0]);
                imagettftext($this->g,
                    $this->fontsize,270,
                    ($this->x+($section*$count)-($bar/2)-($texwidth/2)),
                    $this->y+$this_>h+4,
                    $this->border_color,
                    $this->font,
                    $label);
            }
        }
    }
    private function _drawBorder(){
        if ($this->draw_border) {
            imageline($this->g,
                $this->x,
                $this->y,
                $this->x,
                $this->h+$this->y,
                $this->border_color);
            imageline($this->g,
                $this->x,
                $this->h+$this->y,
                $this->w+$this->x,
                $this->h+$this->y,
                $this->border_color);
        }
    }
    private function _calcYscale(){
        return (float)$this->h/$this->_calcYMax();
    }
    private function _calcXscale(){
        return (float)$this->w/$this->_calcXMax();
    }
    private function _calcYMax(){
        $max=(float)max($this->data)*1.05;
        $len=(float)((int)$max);
        if ($len<2) {
            return $max;
        }else {
            return intval(substr($max,0,2).str_repeat('0',$len-2));
        }
    }
    private function _calcXMax(){
        return max(array_keys($this->data));
    }
    private function _drawHorizontal(){
        if ($this->horizontal_grid_segments) {
            foreach (range(1,$this->horizontal_grid_segments) as $hg){
                $yheight=(int)$this->y+$this->h-($hg*($this->h/$this->horizontal_grid_segments));
                imageline($this->g,
                    $this->x+1,
                    $yheight,
                    $this->w+$this-x,
                    $yheight,
                    $this->grid_color);
                if ($this->y_axis_autolabel) {
                    $ax_step=(int)($this->_calcYMax()/$this->horizontal_grid_segments)*$hg;
                    $box=imagettfbbox($this->fontsize,0,
                        $this->font,$ax_step);
                    $texwidth=abs($box[4]-$box[0]);
                    $texheight=abs($box[5]-$box[1]);
                    imagettftext($this->g,
                        $this->fontsize,0,
                        $this->x-3-$texwidth,
                        $yheight+$texheight/2,
                        $this->border_color,
                        $this->font,
                        $ax_step);
                }
            }
        }
    }
    private function _drawVertical(){
        if ($this->vertical_grid_segments) {
            foreach (range(1,$this->vertical_grid_segments) as $vg){
                $xloc=(int)($this->x+($vg*($this->w/$this->vertical_grid_segments)));
                imageline($this->g,
                    $xloc,
                    $this->y,
                    $xloc,
                    $this->y+$this->h-1,
                    $this->grid_color);
                if ($this->x_axis_autolabel) {
                    $ax_step=(int)(($this->_calcXMax()/$this->vertical_grid_segments)*$vg);
                    $box=imagettfbbox($this->fontsize,270,$this->font,$ax_step);
                    $texwidth=abs($box[4]-$box[0]);
                    imagettftext($this->g,
                        $this->fontsize,270,
                        $xloc-$texwidth/2,
                        $this->y+$this->h+3,
                        $this->border_color,
                        $this->font,
                        $ax_step);
                }
            }
        }
    }
}
?>

实例:

<?php
require_once('MultiGraph.php');
$gfx=imagecreatetruecolor(950,650);
$red=imagecolorallocate($gfx,255,0,0);
$manilla=imagecolorallocate($gfx,255,255,245);
$black=imagecolorallocate($gfx,0,0,0);
$lgray=imagecolorallocate($gfx,200,200,200);
imagefill($gfx,0,0,$manilla);
$graph=new MultiGraph($gfx);
$graph->border_color=$black;
$graph->grid_color=$lgray;
$graph->data_color=$red;
$graph->vertical_grid_segments=10;
$graph->font='MSYH.ttf';
$chartdata=array();
for ($i=0;$i<50;$i++){
    $chartdata[rand(1,200)]=rand(1,1000);
}
$graph->data=$chartdata;
$graph->setDimensions(50,50,300,200);
$graph->drawLineGraph();
$graph->horizontal_grid_segments=9;
$graph->vertical_grid_segments=15;
$graph->setDimensions(50,350,300,200);
$graph->drawPointGraph();
$bardata=array();
foreach (range(1,12) as $mon){
    $bardata[date('F',mktime(0,0,0,$mon))]=rand(1,5000);
}
$cyan=imagecolorallocate($gfx,0,255,255);
$graph->data_color=$cyan;
$graph->fontsize=11;
$graph->horizontal_grid_segments=12;
$graph->setDimensions(450,40,400,500);
$graph->data=$bardata;
$graph->drawBarGraph();
header('Content-type:image/png');
imagepng($gfx);
?>