From ab6b611123cb1af2b1afa52a02c4b974d3ea7bed Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Mon, 5 Nov 2012 11:53:32 +0100
Subject: [PATCH] New post-processing script to calculate flow information from
 G-code

---
 utils/post-processing/flowrate.pl | 39 +++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 utils/post-processing/flowrate.pl

diff --git a/utils/post-processing/flowrate.pl b/utils/post-processing/flowrate.pl
new file mode 100755
index 000000000..573597c4c
--- /dev/null
+++ b/utils/post-processing/flowrate.pl
@@ -0,0 +1,39 @@
+#!/usr/bin/perl -i
+
+#
+# Post-processing script for calculating flow rate for each move
+
+use strict;
+use warnings;
+
+my $E = 0;
+my ($X, $Y);
+while (<>) {
+    if (/^G1 X([0-9.]+) Y([0-9.]+).*? E([0-9.]+)/) {
+        my ($x, $y, $e) = ($1, $2, $3);
+        my $e_length = $e - $E;
+        if ($e_length > 0 && defined $X && defined $Y) {
+            my $dist = sqrt( (($x-$X)**2) + (($y-$Y)**2) );
+            if ($dist > 0) {
+                my $flowrate = sprintf '%.2f', $e_length / $dist;
+                s/(\R+)/ ; XY dist = $dist ; E dist = $e_length ; E\/XY = $flowrate mm\/mm$1/;
+            }
+        }
+        $E = $e;
+        $X = $x;
+        $Y = $y;
+    }
+    if (/^G1 X([0-9.]+) Y([0-9.]+)/) {
+        $X = $1;
+        $Y = $2;
+    }
+    if (/^G1.*? E([0-9.]+)/) {
+        $E = $1;
+    }
+    if (/^G92 E0/) {
+        $E = 0;
+    }
+    print;
+}
+
+__END__