fix utf8 encoding background

main.zig

@@ -126,7 +126,10 @@ fn fillBuffer() !void {
 
     var w = Winsize{};
     var i: u64 = 0;
+    var ii: u64 = 0;
     var buf = std.mem.zeroes([2]u8);
+    var slice: []u8 = undefined;
+    var bytes_written: u3 = 0;
 
     buf[0] = 0;
     w = try getTermDimension();
@@ -147,15 +150,18 @@ fn fillBuffer() !void {
         .c = Point{ .x = 30, .y = 1, .z = 0, .direction = .{ .x = 1, .y = 1, .z = 1 } },
     };
 
+    //clear buffer
     while (true) {
         buffer[0] = 0;
         i = 0;
         while (i < buffer.len) : (i += 4) {
-            const slice = buffer[i .. i + 4];
-            _ = try std.unicode.utf8Encode('_', slice);
-            //slice[0] = 'm';
+            slice = buffer[i .. i + 4];
+            bytes_written = try std.unicode.utf8Encode(' ', slice);
+            ii = 0;
+            while ((bytes_written + ii) < 4) : (ii += 1) {
+                slice[bytes_written + ii] = 0;
+            }
         }
-        try pixel(buffer, w, 5, 10, '\u{1F702}');
         try triangle(buffer, w, vec);
         //_ = try bresenham(buffer, w, Point{ .x = 10, .y = 10, .z = 0 }, Point{ .x = 30, .y = 12, .z = 0 });
 
@@ -179,7 +185,7 @@ fn fillBuffer() !void {
         bounce(w, &vec2.c, 'x');
         bounce(w, &vec2.c, 'y');
         try out.print("{s}", .{buffer});
-        sleep(1000000);
+        sleep(10000000);
         //_ = try stdin.readUntilDelimiterOrEof(&buf, '\n');
     }
 }