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-$box);
imagettftext($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-$box);
$texheight=abs($box-$box);
imagettftext($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-$box);
imagettftext($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(1,1000);
}
$graph->data=$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=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);
?>
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