HuaiDong Blog

$img_gao=170;
$img_kuan=0;
$jiange=30;//横坐标点与点之间的间隔，生成的图片宽度会根据传入数据的多少而自动变化
$zuo=20;//左侧留空
$you=20;//右侧留空
$shang=20;//上留空
$xia=20;//下留空
$zuidashujuzhi=1;
$p_x = array();//点横坐标
$p_y = array();//点纵坐标
$y_name=split(",",$_GET["x_name"]);
if ($_GET["a"]=="") die("error id:0");
$shuju=split(",",$_GET["a"]);
//得到纵轴最大值
for($i=0;$i<count($shuju);$i++){
if(!is_numeric($shuju[$i])) die("error id:1");
if($shuju[$i]>$zuidashujuzhi) $zuidashujuzhi=$shuju[$i];
}
//得到图像宽度
$img_kuan=$zuo+$you+count($shuju)*$jiange;
//然后创建图像资源
$image = imagecreate($img_kuan,$img_gao);
//灰色背景
$white = imagecolorallocate($image, 0xEE, 0xEE, 0xEE);
//坐标轴用黑色显示
$zuobiao_yanse = imagecolorallocate($image, 0x00, 0x00, 0x00);
//折线用蓝色显示
$xian_yanse = imagecolorallocate($image, 0x00, 0x00, 0xFF);
//画坐标
//横轴
imageline ( $image, $zuo, $img_gao-$xia, $img_kuan-$you/2, $img_gao-$xia, $zuobiao_yanse);
//纵轴
imageline ( $image, $zuo, $shang/2, $zuo, $img_gao-$xia, $zuobiao_yanse);
 
 
 
//得到每个点的坐标
for($i=0;$i<count($shuju);$i++){
array_push ($p_x, $zuo+$i*$jiange);
array_push ($p_y, $shang+round(($img_gao-$shang-$xia)*(1-$shuju[$i]/$zuidashujuzhi)));
}
 
 
 
//纵轴刻度
imageline ( $image, $zuo, $shang, $zuo+6, $shang, $zuobiao_yanse);
imagestring ( $image, 1, $zuo/4, $shang,$zuidashujuzhi, $zuobiao_yanse);
imageline ( $image, $zuo, $shang+($img_gao-$shang-$xia)*1/4, $zuo+6, $shang+($img_gao-$shang-$xia)*1/4, $zuobiao_yanse);
imagestring ( $image, 1, $zuo/4, $shang+($img_gao-$shang-$xia)*1/4,$zuidashujuzhi*3/4, $zuobiao_yanse);
imageline ( $image, $zuo, $shang+($img_gao-$shang-$xia)*2/4, $zuo+6, $shang+($img_gao-$shang-$xia)*2/4, $zuobiao_yanse);
imagestring ( $image, 1, $zuo/4, $shang+($img_gao-$shang-$xia)*2/4,$zuidashujuzhi*2/4, $zuobiao_yanse);
imageline ( $image, $zuo, $shang+($img_gao-$shang-$xia)*3/4, $zuo+6, $shang+($img_gao-$shang-$xia)*3/4, $zuobiao_yanse);
imagestring ( $image, 1, $zuo/4, $shang+($img_gao-$shang-$xia)*3/4,$zuidashujuzhi*1/4, $zuobiao_yanse);
 
 
 
//横轴刻度
for($i=0;$i<count($shuju);$i++){
imageline ( $image, $zuo+$i*$jiange, $img_gao-$xia, $zuo+$i*$jiange, $img_gao-$xia-6, $zuobiao_yanse);
imagestring ( $image, 1, $zuo+$i*$jiange-$jiange/4, $shang+($img_gao-$shang-$xia)+2,$y_name[$i], $zuobiao_yanse);
}
 
 
 
 
//折线
$shuju_yanse_int=0;
for($i=0;$i<count($shuju);$i++){
if($i+1<>count($shuju)){
imageline ( $image, $p_x[$i], $p_y[$i], $p_x[$i+1], $p_y[$i+1], $xian_yanse);
imagefilledrectangle($image, $p_x[$i]-1, $p_y[$i]-1, $p_x[$i]+1, $p_y[$i]+1, $xian_yanse);
}
}
//上一个循环没有画出最后一个点效果，这里还要追加
imagefilledrectangle($image, $p_x[count($shuju)-1]-1, $p_y[count($shuju)-1]-1, $p_x[count($shuju)-1]+1, $p_y[count($shuju)-1]+1, $xian_yanse);
 
//标注数据值
for($i=0;$i<count($shuju);$i++){
imagestring ( $image, 3, $p_x[$i]+4, $p_y[$i]-12,$shuju[$i], $zuobiao_yanse);
}
//设定文件头
header('Content-type: image/png');
//输出图像
imagepng($image);
//释放资源
imagedestroy($image);