Rank: 142 based on 409 downloads (last 30 days) and 1 file submitted
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Erik Johnson

E-mail
Company/University
Univ of Southern California

Personal Profile:

Associate Professor & Associate Chair, Astani Department of Civil & Env. Engineering, University of Southern California
B.S. (1988), M.S. (1993), Ph.D. (1997), Aeronautical & Astronautical Engineering, University of Illinois at Urbana-Champaign
http://www.usc.edu/dept/civil_eng/johnsone/

Professional Interests:

 

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Files Posted by Erik
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20 May 2009 Screenshot arrow.m Draw a line with an arrowhead. Author: Erik Johnson arrow, potw, line, graphics, customization, arrowhead 409 54
  • 4.57627
4.6 | 61 ratings
Comments and Ratings on Erik's Files View all
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12 Jun 2010 arrow.m Draw a line with an arrowhead. Author: Erik Johnson zhang, Jiangmin

perfect!
19 May 2010 arrow.m Draw a line with an arrowhead. Author: Erik Johnson Notan

Works great, but the Arrowtips do not look perfect by default as they are the connection of two line ends and therefore not round in pdf printouts.
You can workaround this issue by drawing the arrow in the opposite direction and use parameter: 'End','start'.
But nonetheless it would be nice if they would be perfect by default ;-)

10 May 2010 arrow.m Draw a line with an arrowhead. Author: Erik Johnson David

THANK YOU!!!!

08 May 2010 arrow.m Draw a line with an arrowhead. Author: Erik Johnson Christopher

This code, at least on R2009a, looks very strange.
close all; clc;
figure(1)
arrow([0;0;0],[1;0;0])
arrow([0;0;0],[0;1;0])
arrow([0;0;0],[0;0;1])
axis([-1 1 -1 1 -1 1])

I'm really having trouble with 3-D plots and arrows pointing along the 3rd axis.
04 May 2010 arrow.m Draw a line with an arrowhead. Author: Erik Johnson Molecke, Ryan

I found this implementation to be slow and lacking. Admittedly I was drawing thousands of arrows at extremely short lengths. Here is an inline function I wrote in about 5 minutes to draw simple arrows.

function out = draw_arrow(startpoint,endpoint,headsize)
%by Ryan Molecke

   v1 = headsize*(startpoint-endpoint)/2.5;

   theta = 22.5*pi/180;
   theta1 = -1*22.5*pi/180;
   rotMatrix = [cos(theta) -sin(theta) ; sin(theta) cos(theta)];
   rotMatrix1 = [cos(theta1) -sin(theta1) ; sin(theta1) cos(theta1)];
   
   v2 = v1*rotMatrix;
   v3 = v1*rotMatrix1;
   x1 = endpoint;
   x2 = x1 + v2;
   x3 = x1 + v3;
hold on;
    % below line fills the arrowhead (black)
   fill([x1(1) x2(1) x3(1)],[x1(2) x2(2) x3(2)],[0 0 0]);
   % below line draws line (black)
   plot([startpoint(1) endpoint(1)],[startpoint(2) endpoint(2)],'linewidth',2,'color',[0 0 0]);
Top Tags Applied by Erik
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annotation, arrow, arrowhead, customization, graphics
Files Tagged by Erik
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
20 May 2009 Screenshot arrow.m Draw a line with an arrowhead. Author: Erik Johnson arrow, potw, line, graphics, customization, arrowhead 409 54
  • 4.57627
4.6 | 61 ratings

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