#!/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>);
我一直在尝试解决这个问题,但无法解决这个问题!问题在于转型。绘制的点是颠倒的,需要翻转。我之前已经修复过与此类似的问题,但这次 y 值都是负数(即 -5.8)
我该如何解决这个问题?总而言之,我基本上想要执行转换,但是对于如何使用 -ve 数字执行此操作感到困惑。我搜索了类似的问题,但没有一个处理过 -ve 数字。