X-Git-Url: https://git.ucc.asn.au/?p=atyndall%2Fcits2231.git;a=blobdiff_plain;f=helper.c;h=182409a05e2571c55c922ae7fd04b12f7cc4d889;hp=b1b0d967141ad6d5b08f5d8227fc924fcec4da3b;hb=3affec0660cc9e92f4dc1c23af711b09a9d72866;hpb=2813933dbf92ed25a4b00c514ad20c1893145538

diff --git a/helper.c b/helper.c
index b1b0d96..182409a 100644
--- a/helper.c
+++ b/helper.c
@@ -263,17 +263,25 @@ void drawLine() {
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glColor3f( 0.0, 0.0, 0.0 );
 
+  float arrowLength = 0.5;
+
   glBegin(GL_LINES);
     // x arrow
     glVertex3i(  lineLength, 0.0, 0.0 );
     glVertex3i( -lineLength, 0.0, 0.0 );
     
     // x arrowheads
-    glVertex3i( lineLength - 1, 0.0, 0.0 );
-    glVertex3i( -lineLength - 1, 0.0, 0.0 );
-    
-    glVertex3i( lineLength - 1, 0.0, 0.0 );
-    glVertex3i( -lineLength + 1, 0.0, 0.0 );
+    glVertex3i(  lineLength, 0.0, 0.0 );
+    glVertex3i(  lineLength - arrowLength, 0.0,  1.0 );
+
+    glVertex3i(  lineLength, 0.0, 0.0 );
+    glVertex3i(  lineLength - arrowLength, 0.0, -1.0 );
+
+    glVertex3i( -lineLength, 0.0, 0.0 );
+    glVertex3i( -lineLength - arrowLength, 0.0,  1.0 );
+
+    glVertex3i( -lineLength, 0.0, 0.0 );
+    glVertex3i( -lineLength - arrowLength, 0.0, -1.0 );
 
     // z arrow
     glVertex3i( 0.0, 0.0,  lineLength );