Here's what I am planning to use.. This is to get the coordinates of the corners of the cropping box..
#!/usr/bin/perl w
use strict;
use Math::Complex;
# box1 is the image
my @box1 = (150,150,150,150,150,150,150,150);
#box 2 is the cropping box
my @box2 = (300,75,0,75,0,75,300,75);
my @box2r = save_rotate_points(undef,45,@box2);
print "Rotate BOX 2\n";
foreach my $x (@box2r) {
print $x , "\n";
}
my ($x1,$y1,$x2,$y2) = get_rotation_box(undef,@box2r);
my @points = ($x1,$y1,$x2,$y1,$x2,$y2,$x1,$y2);
print "Bounding Box:\n";
foreach my $x (@points) {
print $x , "\n";
}
sub save_rotate_points {
my ($widget,$angle,@points) = @_;
my $count = @points;
my (@x, @y);
$angle = $angle * pi() / 180;
for(my $i = 0; $i < $count ; $i+=2){
my $xp = ($points[$i] * cos($angle))  ($points[$i+1] * sin($a
+ngle));
my $yp = ($points[$i] * sin($angle)) + ($points[$i+1] * cos($a
+ngle));
push @x, $xp;
push @y, $yp;
}
@points = ($x[0],$y[0],$x[1],$y[1],$x[2],$y[2],$x[3],$y[3]);
return @points;
}
sub get_center_rectangle {
my ($widget,@points) = @_;
my $deltax = ($points[0]+$points[2]+$points[4]+$points[6])/4;
my $deltay = ($points[1]+$points[3]+$points[5]+$points[7])/4;
return $deltax,$deltay;
}
sub get_rotation_box {
my ($widget,@points) = @_;
# get smallest value
my $i = 0;
my ($smallx,$smally,$bigx,$bigy) = (0,0,0,0);
foreach my $x (@points) {
if($i == 0){
if($x <= $smallx){
$smallx = $x;
}
if($x >= $bigx){
$bigx = $x;
}
}else{
if($x <= $smally){
$smally = $x;
}
if($x >= $bigy){
$bigy = $x;
}
$i = 1;
}
$i++;
}
return $smallx,$smally,$bigx,$bigy;
}
sub move_points {
my ($widget,$mx,$my,@points) = @_;
my $i = 0;
my @new_points;
print $mx," ",$my,"\n";
foreach my $x (@points) {
if($i == 0){
print $x , "+" , $mx , "\n";
$x+=$mx;
}else{
$x+=$my;
$i = 1;
}
push @new_points, $x;
$i++;
}
return @new_points;
}
