screen is a thing now, but flashes on keystroke, and doesnt seem to align properly. also, the food appears to RNG more than once

assignments/a1/snake.cc

@@ -371,8 +371,6 @@ void initX(int argc, char * argv[], XInfo & xInfo)
 	 */
 	int i = 0;
 	xInfo.gc[i] = XCreateGC(xInfo.display, xInfo.window, 0, 0);
-	XSetForeground(xInfo.display, xInfo.gc[i], BlackPixel(xInfo.display, xInfo.screen));
-	XSetBackground(xInfo.display, xInfo.gc[i], WhitePixel(xInfo.display, xInfo.screen));
 	XSetFillStyle(xInfo.display, xInfo.gc[i], FillSolid);
 	XSetLineAttributes(xInfo.display, xInfo.gc[i],
 	                     1, LineSolid, CapButt, JoinRound);
@@ -380,8 +378,7 @@ void initX(int argc, char * argv[], XInfo & xInfo)
 	XSelectInput(xInfo.display, xInfo.window,
 		ButtonPressMask | KeyPressMask |
 		PointerMotionMask |
-		EnterWindowMask | LeaveWindowMask |
-		StructureNotifyMask);  // for resize events
+		EnterWindowMask | LeaveWindowMask);  // for resize events
 
 	/*
 	 * Put the window on the screen.
@@ -404,8 +401,6 @@ void repaint(XInfo & xinfo)
 	unsigned int height = windowInfo.height;
 	unsigned int width = windowInfo.width;
 
-	// big black rectangle to clear background
-
 	// draw display list
 	while (begin != end)
   {
@@ -413,7 +408,6 @@ void repaint(XInfo & xinfo)
 		d->paint(xinfo);
 		begin++;
 	}
-	XFlush(xinfo.display);
 }
 
 void handleKeyPress(XInfo & xinfo, XEvent & event)
@@ -484,14 +478,11 @@ void eventLoop(XInfo & xinfo)
 	// Add stuff to paint to the display list
 	dList.push_front(&snake);
   dList.push_front(&fruity);
-
 	XEvent event;
-
   unsigned long lastRepaint = 0;
   int inside = 0;
   XWindowAttributes w;
   XGetWindowAttributes(xinfo.display, xinfo.window, &w);
-
   int depth = DefaultDepth(xinfo.display, DefaultScreen(xinfo.display));
   // represents thing to draw
   Pixmap buffer = XCreatePixmap(xinfo.display, xinfo.window, w.width, w.height, depth);
@@ -515,6 +506,7 @@ void eventLoop(XInfo & xinfo)
           inside = 0;
           break;
       }
+      usebuffer = !usebuffer;
     }
 
     unsigned long end = now();
@@ -536,9 +528,10 @@ void eventLoop(XInfo & xinfo)
         XClearWindow(xinfo.display, pixmap);
       }
 
-      //XSetForeground(xinfo.display, xinfo.gc[0], BlackPixel(xinfo.display, xinfo.screen));
-      //XSetBackground(xinfo.display, xinfo.gc[0], WhitePixel(xinfo.display, xinfo.screen));
+      XSetForeground(xinfo.display, xinfo.gc[0], BlackPixel(xinfo.display, xinfo.screen));
+      XSetBackground(xinfo.display, xinfo.gc[0], WhitePixel(xinfo.display, xinfo.screen));
       handleAnimation(xinfo, inside);
+      repaint(xinfo);
       if (usebuffer)
       {
         XCopyArea(xinfo.display, pixmap, xinfo.window, xinfo.gc[0], 0, 0 , w.width, w.height, 0, 0);