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TUTORIAL: Make the ball bounce.

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This commit is contained in:
Nick Couchman 2020-12-30 23:05:28 -05:00
parent f9aaa78768
commit 8436f2e22e
2 changed files with 75 additions and 0 deletions
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64
src/protocols/ball/ball.c
View File

@ -25,10 +25,60 @@
#include <guacamole/socket.h> #include <guacamole/socket.h>
#include <guacamole/user.h> #include <guacamole/user.h>
#include <pthread.h>
#include <stdlib.h> #include <stdlib.h>
const char* TUTORIAL_ARGS[] = { NULL }; const char* TUTORIAL_ARGS[] = { NULL };
void* ball_render_thread(void* arg) {
/* Get data */
guac_client* client = (guac_client*) arg;
ball_client_data* data = (ball_client_data*) client->data;
/* Update ball position as long as client is running */
while (client->state == GUAC_CLIENT_RUNNING) {
/* Sleep a bit */
usleep(30000);
/* Update position */
data->ball_x += data->ball_velocity_x * 30 / 1000;
data->ball_y += data->ball_velocity_y * 30 / 1000;
/* Bounce if necessary */
if (data->ball_x < 0) {
data->ball_x = -data->ball_x;
data->ball_velocity_x = -data->ball_velocity_x;
}
else if (data->ball_x >= 1024 - 128) {
data->ball_x = (2 * (1024 - 128)) - data->ball_x;
data->ball_velocity_x = -data->ball_velocity_x;
}
if (data->ball_y < 0) {
data->ball_y = -data->ball_y;
data->ball_velocity_y = -data->ball_velocity_y;
}
else if (data->ball_y >= 768 - 128) {
data->ball_y = (2 * (768 - 128)) - data->ball_y;
data->ball_velocity_y = -data->ball_velocity_y;
}
guac_protocol_send_move(client->socket, data->ball,
GUAC_DEFAULT_LAYER, data->ball_x, data->ball_y, 0);
/* End frame and flush socket */
guac_client_end_frame(client);
guac_socket_flush(client->socket);
}
return NULL;
}
int ball_join_handler(guac_user* user, int argc, char** argv) { int ball_join_handler(guac_user* user, int argc, char** argv) {
/* Get client associated with user */ /* Get client associated with user */
@ -79,6 +129,9 @@ int ball_join_handler(guac_user* user, int argc, char** argv) {
int ball_free_handler(guac_client* client) { int ball_free_handler(guac_client* client) {
ball_client_data* data = (ball_client_data*) client->data; ball_client_data* data = (ball_client_data*) client->data;
/* Wait for render thread to terminate */
pthread_join(data->render_thread, NULL);
/* Free client-level ball layer */ /* Free client-level ball layer */
guac_client_free_layer(client, data->ball); guac_client_free_layer(client, data->ball);
@ -109,6 +162,17 @@ int guac_client_init(guac_client* client) {
/* Client-level handlers */ /* Client-level handlers */
client->join_handler = ball_join_handler; client->join_handler = ball_join_handler;
client->free_handler = ball_free_handler; client->free_handler = ball_free_handler;
/* Start ball at upper left */
data->ball_x = 0;
data->ball_y = 0;
/* Move at a reasonable pace to the lower right */
data->ball_velocity_x = 200; /* pixels per second */
data->ball_velocity_y = 200; /* pixels per second */
/* Start render thread */
pthread_create(&data->render_thread, NULL, ball_render_thread, client);
return 0; return 0;

11
src/protocols/ball/ball.h
View File

@ -22,9 +22,20 @@
#include <guacamole/layer.h> #include <guacamole/layer.h>
#include <pthread.h>
typedef struct ball_client_data { typedef struct ball_client_data {
guac_layer* ball; guac_layer* ball;
int ball_x;
int ball_y;
int ball_velocity_x;
int ball_velocity_y;
pthread_t render_thread;
} ball_client_data; } ball_client_data;