(no commit message)

diff --git a/helper.c b/helper.c
index 9695093..b1b0d96 100644 (file)
--- a/helper.c
+++ b/helper.c
@@ -264,8 +264,18 @@ void drawLine() {
   glColor3f( 0.0, 0.0, 0.0 );
 
   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 );
+
+    // z arrow
     glVertex3i( 0.0, 0.0,  lineLength );
     glVertex3i( 0.0, 0.0, -lineLength );
   glEnd();