How to create simply arrow - second edition

[rozowykubek]

Hey

preface&task number 1
To be honest my lecturer gave me weird task in exchange for possibility to leave his classes without any consequences (i am college student and in december i want to go abroad for a month ) it has to be ImageMagick whose i did not know until yesterday

Task 1 - completed

[Bonzo]

You can draw multiple lines one after the other and you know where the end of the horizontal line is.

[glennrp]

Why not simply draw 3 lines?

[rozowykubek]

i was so absorbed with understanding commands et cetera that i did not think about such brilliant solution

[rozowykubek]

With your briliant and trival at the same time solution i was able to survive face to face encounter with my lecturer, but he gone further and gave me another, more complicated arrow quest. If I understood him correctly i have to make "arrow head" pattern which I could generate on the end of earlier created line. I Assume it has to look similar to example down below

Question is, is it possible to do it without using of external application like Bash for example ? and if, with which command should I get closer ?
He ( lecturer ) was talking something about "stroke" and making arrowhead by using just command prompt -.-
Thank you for any tips

arrow_head="l -15,-5 +5,+5 -5,+5 +15,-5 z"

convert -size 100x60 xc: -draw 'line 10,30 80,30' \
-draw "stroke blue fill skyblue
path 'M 80,30 $arrow_head' " \
arrow_horizontal.gif

[fmw42]

Best I can suggest is to see http://www.imagemagick.org/Usage/draw/#arrows

[rozowykubek]

ok, finally I made it in bash and it looks like this:

#!/bin/bash
echo 'rysujemy glowe strzalki'
arrow_head="path 'M 0,0 l -15,-5 +5,+5 -5,+5 +15,-5 z'"
convert test.jpeg -draw 'line 40,100 200,180' \
-draw "stroke blue fill skyblue
translate 200,180 rotate -45 $arrow_head' " \
test_arrow.jpeg
echo 'narysowana'

Is that possible to do the same but in semi-automatic way without using every time "rotate" command ?
I would like "arrow head" following after the main line but I do not see something like this in examples

[whugemann]

Strange arrow head that you are drawing here ... I'm not sure what you mean by the arrow head following the main line, but what I would rather do is to define the entire arrow as one polygon object and then place it in its entirety by using translate (and possibly rotate) before drawing that object.