X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=helper.c;h=d7c6291b1ade4f1b6f9d99a0d51d8b1617625fb3;hb=6050088f70bb80701c08dcee9ad786b6c62acf7a;hp=b80a513ea35dd8d76d7b69dc5ef06f0a3be238af;hpb=a73bfc78d5ebac0c1cb851ed8b619fbd13acea9c;p=atyndall%2Fcits2231.git

diff --git a/helper.c b/helper.c
index b80a513..d7c6291 100644
--- a/helper.c
+++ b/helper.c
@@ -263,7 +263,7 @@ void drawLine() {
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glColor3f( 0.0, 0.0, 0.0 );
 
-  float arrowLength = 1.0;
+  float arrowLength = 0.5;
 
   glBegin(GL_LINES);
     // x arrow
@@ -272,11 +272,21 @@ void drawLine() {
     
     // x arrowheads
     glVertex3i(  lineLength, 0.0, 0.0 );
-    glVertex3i(  lineLength -  arrowLength, 0.0,  arrowLength );
+    glVertex3i(  lineLength - arrowLength, 0.0,  0.9 );
+
+    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);