(no commit message)

[atyndall/cits2231.git] / helper.c

diff --git a/helper.c b/helper.c
index 9695093..d7d418b 100644 (file)
--- a/helper.c
+++ b/helper.c
@@ -263,11 +263,30 @@ void drawLine() {
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glColor3f( 0.0, 0.0, 0.0 );
 
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glColor3f( 0.0, 0.0, 0.0 );
 

+  float arrowLength = 0.3;
+

   glBegin(GL_LINES);
   glBegin(GL_LINES);

+    // x arrow

     glVertex3i(  lineLength, 0.0, 0.0 );
     glVertex3i( -lineLength, 0.0, 0.0 );
     glVertex3i(  lineLength, 0.0, 0.0 );
     glVertex3i( -lineLength, 0.0, 0.0 );

-    glVertex3i( 0.0, 0.0,  lineLength );
-    glVertex3i( 0.0, 0.0, -lineLength );
+    
+    // x arrowheads
+    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 );
+
+    // 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);
   glEnd();
 
   glDisable(GL_BLEND);