X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=scene.c;h=9fc30e76005acac8a89da7b455c5c55479a8c3f1;hb=2d70944922c54d4814b5fcd779a884ba259c4742;hp=7afde9cd41ca880037b945980ede82e8eef951d6;hpb=f8f4c489085c83bc31276148991166165085b557;p=atyndall%2Fcits2231.git

diff --git a/scene.c b/scene.c
index 7afde9c..9fc30e7 100644
--- a/scene.c
+++ b/scene.c
@@ -607,6 +607,24 @@ void drawFloor() {
   drawSquare(0, -floorSize, -floorSize, floorSize, floorSize);
 }
 
+/**
+ * Draw x, z axis on floor
+ */
+void drawLine() {
+    glDisable(GL_TEXTURE_2D);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glColor4ub( 0.0, 0.0, 0.0, 0.5 );
+
+    glBegin(GL_LINES);
+    glVertex3i( 10.0, 0.1, 10.0);
+    glVertex3i( -10.0, 0.1, -10.0);
+    glEnd();
+
+    glDisable(GL_BLEND);
+    glEnable(GL_TEXTURE_2D);
+}
+
 /**
  * Display function
  */
@@ -639,6 +657,8 @@ void display() {
 
     drawFloor();
 
+    drawLine();
+    
     // Draw teapot for a test object
     glPushMatrix();
       glTranslatef(0.0, 1.0, 0.0); // **NOTE: Teapot does not rest on surface