perl - 如何防止 GD::Graph 写入最后一个 X 标签并覆盖我的其他标签？

Question

我设置了 x_label_skip 跳过标签，但它仍然尝试显示最后一个标签，并且它正在覆盖另一个标签，看起来很乱。不应该写最后一个标签。它应该跳过最后一个标签。我将要跳过的标签数量设置为有多少数据点的函数。

这是它的样子:



代码:

my $graph = GD::Graph::lines->new(400, 500);
$graph->set(
  r_margin          => 2,
  x_label           => 'Date',
  y_label           => 'Price',
  title             => "$symbol1, $symbol2",
  dclrs             => [ qw(lred lblue lgreen lyellow lpurple cyan lorange) ],
  transparent       => 0,
  x_labels_vertical => 1,
  x_label_skip      => int ((@tmpDate * 8)/(400-50) + 1), # a function of # of data points, each label 8px. More labels, more skip.
) or die $graph->error;

Answer 1

好的，我找到了。只需使用模数将条目数除以要跳过的标签数，并将其用作偏移量。似乎 GD::Graph 总是想打印最后一个标签，所以无法控制，但您可以控制要打印的第一个标签。对我来说似乎是倒退，但无论如何。

my $graph = GD::Graph::lines->new(400, 500);
my $skip = int ((@tmpDate * 8)/(400-50) + 1); # a function of # of data points, each label 8px. More labels, more skip. 
$graph->set( 
  r_margin          => 2,
  x_label           => 'Date',
  y_label           => 'Price',
  title             => "$symbol1, $symbol2",
  dclrs             => [ qw(lred lblue lgreen lyellow lpurple cyan lorange) ],
  transparent       => 0,
  x_labels_vertical => 1,
  x_label_skip      => $skip,
  x_tick_offset     => @tmpDate % $skip, # ensure last label doesn't overwrite second-to-last label
) or die $graph->error;