X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=helper.c;h=aebdaeecebffa1ed6574dfca8e5d0f652c8655f4;hb=279764e831c70dd8e02a5d70b1c3715464b1b731;hp=b1b0d967141ad6d5b08f5d8227fc924fcec4da3b;hpb=2813933dbf92ed25a4b00c514ad20c1893145538;p=atyndall%2Fcits2231.git

diff --git a/helper.c b/helper.c
index b1b0d96..aebdaee 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 );