1 files changed, 46 insertions, 0 deletions
diff --git a/kue/disc.cpp b/kue/disc.cpp
new file mode 100644
index 00000000..2b6946e5
--- /dev/null
+++ b/kue/disc.cpp
@@ -0,0 +1,46 @@
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include <math.h>
+
+#include "disc.h"
+
+// The pre-allocated number of our display list
+const int DISC_DISPLAY_LIST = 3;
+// The disc radius currently cached in our display list
+double disc_list_radius = 0.0;
+
+void disc::draw(double x, double y, double r)
+{
+    glPushMatrix();
+
+    // Move to the specified location
+    glTranslatef(x, y, 0.0001);
+
+    // Have we cached this radius
+    if ((r == disc_list_radius) && (glIsList(DISC_DISPLAY_LIST) == GL_TRUE))
+    {
+        // Yes, just call the display list
+        glCallList(DISC_DISPLAY_LIST);
+    }
+    else
+    {
+        // Nope, make a new quadric object
+	GLUquadricObj *quad = gluNewQuadric();
+
+        // Make a new display list
+	glNewList(DISC_DISPLAY_LIST, GL_COMPILE_AND_EXECUTE);
+        // Draw the disc
+	gluDisk(quad, 0.0, r, 10, 1);
+        // End the display list
+	glEndList();
+
+        // Update the cached value
+        disc_list_radius = r;
+
+        // Delete the quadric object
+	gluDeleteQuadric(quad);
+    }
+ 
+    glPopMatrix();
+}