将SVG网格转换为坐标网格

时间:2013-02-14 23:15:27

标签: perl svg

#!/usr/bin/perl
use DBI;
use CGI::Carp qw(fatalsToBrowser);

#Set content type
print "Content-Type: image/svg-xml\n\n";

#Establish connection to database
$dbh = DBI->connect ('dbi:Oracle:geosgen','USER','PASS')
|| die "Man down! Man down!: $DBI::errstr";

#Send SQL query for mountains
$sth1 = $dbh->prepare("select table_alias.mot.sdo_point.X, table_alias.mot.sdo_point.Y, table_alias.name 
from X.mounts table_alias");

$sth1->execute;

#Send SQL query for tourist attraction 
$sth2 = $dbh->prepare("select table_alias.mot.sdo_point.X, table_alias.mot.sdo_point.Y 
from   s1227289.tours table_alias");

$sth2->execute;

#Set content type
print qq(<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN" 
"http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd">);

print qq(<svg width="20cm" height="20cm" viewBox="-5.8 56 0.8 2">);

#print mountains
while (@data = $sth1->fetchrow_array()) {
print qq(
  <circle cx="$data[1]" cy="$data[0]" r="0.002" fill="green">
  </circle> 
  <text x="$data[1]" 
    y="$data[0]" 
    fill="black" 
    style='font-size:0.01px;font-family:Arial'>$data[2]</text>  

       );   
  }

#print tourist attractions
while (@data = $sth2->fetchrow_array()) {
print qq(
  <circle cx="$data[1]" cy="$data[0]" r="0.002" fill="red">
  </circle>   
       );   
  }

print qq(</svg>);

我一直在努力解决这个问题,但是我无法理解它!问题在于转型。绘制的点是颠倒的,需要翻转。我之前已经解决了类似的问题,但这次y值都是负数(即-5.8)

我该如何解决这个问题?总结一下,我基本上想要进行转换,但是如何用-ve数字来解决这个问题。我搜索过类似的问题,但没有人处理过-ve数字。

1 个答案:

答案 0 :(得分:0)

添加transform =“scale(1,-1)”属性将翻转事物。或者也可能更简单,在你的php输出中,y值为-1 * $ data [0]