[PerlChina] Re: GD画图请教

首先要看服务器错误日志

On Mon, 2 Nov 2009 20:22:52 -0600
chunjiang he <camelbbs@gmail.com> wrote:

> 我用GD画图的时候，能不能读取一个文件中的数据然后画图呢，我这样做了，但是出现internal server error错误。
> 如果不从文件中读取，而是把数据放在程序中，就没有问题，请大家指教
>
> 下面是我从文件中读取数据然后画图的程序：
>
> #!d:/perl/bin/perl
>
> use GD;
>
> print "Content-type: image/png\n\n";
>
> my $file="test.txt";
>
> sub min{
> my @a=@_;
> my $s=pop @a;;
> @a=map {$_-$s} @a;
> return @a;
>
> }
>
> my @new;
>
> open(FILE,$file) or die;
> while(my $line=<FILE>){
> chomp $line;
> my @num=split /,/$dd[4];
> push @new,@num;
> }
>
> close(FILE);
>
> @new=sort {$a<=>$b} @new;
>
> my $cha=$new[-1]-$new[0];
>
> my $bei=$cha/700;
> #my $bei=int ($cha/600);
> my $size=$cha/$bei;
>
> # create a new image 图片大小按压缩之后X1.1倍
> my $im = new GD::Image($size*1.1+100,100);
>
> # allocate some colors
> my $white = $im->colorAllocate(255,255,255);
> my $black = $im->colorAllocate(0,0,0);
> my $red = $im->colorAllocate(255,0,0);
> my $blue = $im->colorAllocate(0,0,255);
>
> # make the background transparent and interlaced
> $im->transparent($white);
> $im->interlaced('true');
>
> my $one=0;
> my $two=20;
> my $three=10;
> my $four=5;
>
> open(FILE,$file) or die;
> while(my $line=<FILE>){
> chomp $line;
> my @dd=split /\t/,$line;
> my $name=$dd[1];
> my @num=split /,/,$dd[4];
> @num=sort {$a<=>$b} @num;
>
> @num= &min(@num,$new[0]); ##传递参数给子程序的时候，会将所有参数存为一个数组 @_
>
> for(my $i=0;$i<@num;){
>
> $im->rectangle($num[$i]/$bei+100,$one,$num[$i+1]/$bei+100,$two,
> $black);
>
> $im->fill($num[$i]/$bei+100+($num[$i+1]/$bei-$num[$i]/$bei)/2,$three,
> $black);
> $i=$i+2;
> }
> for(my $i=1;$i<@num-1;){
>
> $im->line($num[$i]/$bei+100,$three,$num[$i+1]/$bei+100,$three,
> $black);
> $i=$i+2;
> }
>
> $im->string(gdLargeFont,0,$four,$name,$black);
>
> # make sure we are writing to a binary stream
> binmode STDOUT;
>
> # Convert the image to PNG and print it on standard output
> print $im->png;
>
> $one=$one+40;
> $two=$two+40;
> $three=$three+40;
> $four=$four+35;
>
> }
>
> close(FILE);
>
> >

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