PHP绘制心电形状曲线统计图表[源码]_PHP教程

　　 先看下最终效果:

下面为PHP代码:

/******************************  
*            折线图生成函数  
******************************/  

function line_stats_pic($value_y,$width,$high,$strong=1,$fix=0){  

//y值处理函数  
function line_point_y($num,$width,$high,$max_num_add,$min_num_add,$y_pxdensity){  

    $return=$high-floor(($num-$min_num_add+$y_pxdensity)/(($max_num_add-$min_num_add)/$high));  

    return $return;  
}  
 
//参数处理  

$allnum=sizeof($value_y);  


$maxmax_num=max($value_y);                            //最大值  


$minmin_num=min($value_y);                            //最小值  


$limit_m=$max_num-$min_num;                        //极差  


$max_num_add=$max_num+$limit_m*0.1;                //轴最大值  


$min_num_add=$min_num-$limit_m*0.1;                //轴最小值  


$limit=$max_num_add-$min_num_add;                 //极差-坐标轴y  


$y_pxdensity=($max_num_add-$min_num_add)/$high;    //y轴密度  


$x_pxdensity=floor($width/$allnum);                //x轴密度  

reset($value_y);                                 //将数组指针归零  

$i=0;  

foreach($value_y as $val){  
    $point_y[$i]=line_point_y($val,$width,$high,$max_num_add,$min_num_add,$y_pxdensity);  
    $i++;  
}  

$zero_y=line_point_y(0,$width,$high,$max_num_add,$min_num_add,$y_pxdensity);    //零点的y值  


$empty_size_x=(strlen($max_num) > strlen($min_num) ? strlen($max_num) : strlen($min_num))*5+3;                    //左边空白  

 
//图片流开始  
header("Content-type:image/png");  

$pic=imagecreate($width+$empty_size_x+10,$high+13);  

imagecolorallocate($pic,255,255,255);         //背景色  

$color_1=imagecolorallocate($pic,30,144,255); //线条色  


$color_2=imagecolorallocate($pic,0,0,0);     //黑色  


$color_3=imagecolorallocate($pic,194,194,194);//灰色  

//绘制网格  
imagesetthickness($pic,1);                    //网格线宽  

$y_line_width=floor($width/100);             //纵网格线数目  


$y_line_density=$y_line_width==0 ? 0 :floor($width/$y_line_width); //纵网格线密度  


$point_zero_y=$zero_y > $high ? $high : $zero_y;  

imagestring($pic,1,$empty_size_x-1,$high+4,"0",$color_2); //零点数轴标记  

for($i=1;$i = $y_line_width;$i++){            //绘制纵网格线  

    imagesetthickness($pic,1);                 //网格线宽  
    imageline($pic,$y_line_density*$i+$empty_size_x,0,$y_line_density*$i+$empty_size_x,$high,$color_3);  
    imagesetthickness($pic,2);                 //轴点线宽  
    imageline($pic,$y_line_density*$i+$empty_size_x,$point_zero_y-4,$y_line_density*$i+$empty_size_x,$point_zero_y,$color_2);  
    imagestring($pic,1,10						


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