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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