X-Git-Url: https://git.ucc.asn.au/?p=atyndall%2Fcits2231.git;a=blobdiff_plain;f=helper.c;h=404094752514a120a13e43ca4fc58f7dd8ccb814;hp=b1b0d967141ad6d5b08f5d8227fc924fcec4da3b;hb=9679e75a0bac57d3a2dc8602963c2ac4b94905b3;hpb=2813933dbf92ed25a4b00c514ad20c1893145538

diff --git a/helper.c b/helper.c
index b1b0d96..4040947 100644
--- a/helper.c
+++ b/helper.c
@@ -263,21 +263,30 @@ void drawLine() {
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glColor3f( 0.0, 0.0, 0.0 );
 
+  float arrowLength = 1.0;
+
   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 );
 
     // z arrow
-    glVertex3i( 0.0, 0.0,  lineLength );
-    glVertex3i( 0.0, 0.0, -lineLength );
+    glVertex3i(  0.0, 0.0,  lineLength );
+    glVertex3i(  0.0, 0.0, -lineLength );
+
+    // z arrowheads
+    glVertex3i(  0.0, 0.0,  lineLength );
+    glVertex3i(  1.0, 0.0,  lineLength - arrowLength );
+
+    glVertex3i(  0.0, 0.0,  lineLength );
+    glVertex3i( -1.0, 0.0,  lineLength - arrowLength );
   glEnd();
 
   glDisable(GL_BLEND);