TUTORIAL: Add ball to display.

src/protocols/ball/Makefile.am

@@ -5,6 +5,8 @@ AM_FLAGS = -Werror -Wall -pedantic
 
 lib_LTLIBRARIES = libguac-client-ball.la
 
+noinst_HEADERS = ball.h
+
 libguac_client_ball_la_SOURCES = \
     ball.c
 

src/protocols/ball/ball.c

@@ -17,7 +17,10 @@
  * under the License.
  */
 
+#include "ball.h"
+
 #include <guacamole/client.h>
+#include <guacamole/layer.h>
 #include <guacamole/protocol.h>
 #include <guacamole/socket.h>
 #include <guacamole/user.h>
@@ -31,6 +34,10 @@ int ball_join_handler(guac_user* user, int argc, char** argv) {
     /* Get client associated with user */
     guac_client* client = user->client;
     
+    /* Get ball layer from client data */
+    ball_client_data* data = (ball_client_data*) client->data;
+    guac_layer* ball = data->ball;
+
     /* Get user-specific socket */
     guac_socket* socket = user->socket;
 
@@ -46,6 +53,18 @@ int ball_join_handler(guac_user* user, int argc, char** argv) {
             GUAC_COMP_OVER, GUAC_DEFAULT_LAYER,
             0x80, 0x80, 0x80, 0xFF);
 
+    /* Set up ball layer */
+    guac_protocol_send_size(socket, ball, 128, 128);
+
+    /* Prepare a curve which covers the entire layer */
+    guac_protocol_send_rect(socket, ball,
+            0, 0, 128, 128);
+
+    /* Fill curve with solid color */
+    guac_protocol_send_cfill(socket,
+            GUAC_COMP_OVER, ball,
+            0x00, 0x80, 0x80, 0xFF);
+    
     /* Mark end-of-frame */
     guac_protocol_send_sync(socket, client->last_sent_timestamp);
 
@@ -57,13 +76,39 @@ int ball_join_handler(guac_user* user, int argc, char** argv) {
 
 }
 
+int ball_free_handler(guac_client* client) {
+
+    ball_client_data* data = (ball_client_data*) client->data;
+
+    /* Free client-level ball layer */
+    guac_client_free_layer(client, data->ball);
+
+    /* Free client-specific data */
+    free(data);
+
+    /* Data successfully freed */
+    return 0;
+
+}
+
+
 int guac_client_init(guac_client* client) {
 
+    /* Allocate storage for client-specific data */
+    ball_client_data* data = malloc(sizeof(ball_client_data));
+
+    /* Set up client data and handlers */
+    client->data = data;
+
+    /* Allocate layer at the client level */
+    data->ball = guac_client_alloc_layer(client);
+    
     /* This example does not implement any arguments */
     client->args = TUTORIAL_ARGS;
 
     /* Client-level handlers */
     client->join_handler = ball_join_handler;
+    client->free_handler = ball_free_handler;
 
     return 0;
 

src/protocols/ball/ball.h

@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef BALL_H
+#define BALL_H
+
+#include <guacamole/layer.h>
+
+typedef struct ball_client_data {
+
+    guac_layer* ball;
+
+} ball_client_data;
+
+#endif