mutter/tests/interactive/test-clip.c
2011-11-10 15:37:50 +00:00

377 lines
9.5 KiB
C

#include <clutter/clutter.h>
#include <gmodule.h>
#include <math.h>
typedef struct _CallbackData CallbackData;
typedef struct _Clip Clip;
typedef enum
{
CLIP_NONE,
CLIP_RECTANGLE,
CLIP_ROTATED_RECTANGLE,
CLIP_SHAPES
} ClipType;
struct _Clip
{
ClipType type;
gint x1, y1, x2, y2;
};
struct _CallbackData
{
ClutterActor *stage;
CoglHandle hand;
Clip current_clip;
GSList *clips;
};
static const char
instructions[] =
"Press and drag any of the three mouse buttons to add a clip with different "
"shapes. Press 'r' to reset or 'u' to undo the last clip.";
static void
path_shapes (gint x, gint y, gint width, gint height)
{
cogl_path_move_to (x, y);
cogl_path_line_to (x, (y + height * 4 / 5));
cogl_path_line_to ((x + width * 4 / 15), (y + height * 4 / 5));
cogl_path_close ();
cogl_path_rectangle (x + width / 3,
y,
x + width * 9 / 15,
y + height * 4 / 5);
cogl_path_ellipse ((x + width * 4 / 5),
(y + height * 2 / 5),
(width * 2 / 15),
(height * 2 / 5));
}
static void
draw_shapes (gint x, gint y)
{
path_shapes (x, y, 300, 100);
cogl_set_source_color4ub (0x00, 0x00, 0xff, 0xff);
cogl_path_fill_preserve ();
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_path_stroke ();
}
static void
make_clip_path (Clip *clip)
{
switch (clip->type)
{
case CLIP_NONE:
break;
case CLIP_RECTANGLE:
cogl_path_rectangle (clip->x1,
clip->y1,
clip->x2,
clip->y2);
break;
case CLIP_ROTATED_RECTANGLE:
{
int size = MIN (ABS (clip->x2 - clip->x1),
ABS (clip->y2 - clip->y1));
int cx = (clip->x1 + clip->x2) / 2;
int cy = (clip->y1 + clip->y2) / 2;
cogl_path_move_to (cx - size / 2, cy);
cogl_path_line_to (cx, cy - size / 2);
cogl_path_line_to (cx + size / 2, cy);
cogl_path_line_to (cx, cy + size / 2);
cogl_path_close ();
}
break;
case CLIP_SHAPES:
{
int x, y, width, height;
if (clip->x1 < clip->x2)
{
x = clip->x1;
width = clip->x2 - x;
}
else
{
x = clip->x2;
width = clip->x1 - x;
}
if (clip->y1 < clip->y2)
{
y = clip->y1;
height = clip->y2 - y;
}
else
{
y = clip->y2;
height = clip->y1 - y;
}
path_shapes (x, y, width, height);
}
break;
}
}
static void
on_paint (ClutterActor *actor, CallbackData *data)
{
int i;
ClutterGeometry stage_size;
gint hand_width, hand_height;
GSList *node;
clutter_actor_get_allocation_geometry (data->stage, &stage_size);
hand_width = cogl_texture_get_width (data->hand);
hand_height = cogl_texture_get_height (data->hand);
/* Setup the clipping */
for (node = data->clips; node; node = node->next)
{
Clip *clip = (Clip *) node->data;
if (clip->type == CLIP_RECTANGLE)
cogl_clip_push_rectangle (clip->x1,
clip->y1,
clip->x2,
clip->y2);
else if (clip->type == CLIP_ROTATED_RECTANGLE)
{
float size = MIN (ABS (clip->x2 - clip->x1),
ABS (clip->y2 - clip->y1));
int cx = (clip->x1 + clip->x2) / 2;
int cy = (clip->y1 + clip->y2) / 2;
size = sqrtf ((size / 2) * (size / 2) * 2);
cogl_push_matrix ();
/* Rotate 45° about the centre point */
cogl_translate (cx, cy, 0.0f);
cogl_rotate (45.0f, 0.0f, 0.0f, 1.0f);
cogl_clip_push_rectangle (-size / 2, -size / 2, size / 2, size / 2);
cogl_pop_matrix ();
}
else
{
make_clip_path (clip);
cogl_clip_push_from_path ();
}
}
/* Draw a rectangle filling the entire stage */
cogl_set_source_color4ub (0x80, 0x80, 0xff, 0xff);
cogl_rectangle (0, 0, stage_size.width, stage_size.height);
draw_shapes (10, 10);
/* Draw the hand at different rotations */
for (i = -2; i <= 2; i++)
{
cogl_push_matrix ();
cogl_translate (stage_size.width / 2 + stage_size.width / 6 * i,
stage_size.height / 2, 0);
cogl_rotate (i * 40, 0, 1, 0);
cogl_set_source_color4ub (0xff, 0xff, 0xff, 0xff);
cogl_set_source_texture (data->hand);
cogl_rectangle_with_texture_coords ((-hand_width / 2),
(-hand_height / 2),
(hand_width / 2),
(hand_height / 2),
0, 0, 1, 1);
cogl_pop_matrix ();
}
draw_shapes (stage_size.width - 310, stage_size.height - 110);
/* Remove all of the clipping */
g_slist_foreach (data->clips, (GFunc) cogl_clip_pop, NULL);
/* Draw the bounding box for each of the clips */
for (node = data->clips; node; node = node->next)
{
Clip *clip = (Clip *) node->data;
make_clip_path (clip);
cogl_set_source_color4ub (0x00, 0x00, 0xff, 0xff);
cogl_path_stroke ();
}
/* Draw the bounding box for the pending new clip */
if (data->current_clip.type != CLIP_NONE)
{
make_clip_path (&data->current_clip);
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_path_stroke ();
}
}
static gboolean
on_button_press (ClutterActor *stage, ClutterButtonEvent *event,
CallbackData *data)
{
data->current_clip.x1 = data->current_clip.x2 = event->x;
data->current_clip.y1 = data->current_clip.y2 = event->y;
data->current_clip.type
= event->button == 1 ? CLIP_RECTANGLE
: event->button == 2 ? CLIP_SHAPES
: CLIP_ROTATED_RECTANGLE;
clutter_actor_queue_redraw (stage);
return FALSE;
}
static gboolean
on_button_release (ClutterActor *stage, ClutterButtonEvent *event,
CallbackData *data)
{
if (data->current_clip.type != CLIP_NONE)
{
data->clips = g_slist_prepend (data->clips,
g_slice_copy (sizeof (Clip),
&data->current_clip));
data->current_clip.type = CLIP_NONE;
}
clutter_actor_queue_redraw (stage);
return FALSE;
}
static gboolean
on_motion (ClutterActor *stage, ClutterMotionEvent *event,
CallbackData *data)
{
if (data->current_clip.type != CLIP_NONE)
{
data->current_clip.x2 = event->x;
data->current_clip.y2 = event->y;
clutter_actor_queue_redraw (stage);
}
return FALSE;
}
static void
free_clips (CallbackData *data)
{
GSList *node;
for (node = data->clips; node; node = node->next)
g_slice_free (Clip, node->data);
g_slist_free (data->clips);
data->clips = NULL;
}
static gboolean
on_key_press (ClutterActor *stage,
ClutterEvent *event,
CallbackData *data)
{
switch (clutter_event_get_key_symbol (event))
{
case CLUTTER_KEY_r:
free_clips (data);
clutter_actor_queue_redraw (stage);
break;
case CLUTTER_KEY_u:
if (data->clips)
{
g_slice_free (Clip, data->clips->data);
data->clips = g_slist_delete_link (data->clips, data->clips);
clutter_actor_queue_redraw (stage);
}
break;
}
return FALSE;
}
G_MODULE_EXPORT int
test_clip_main (int argc, char **argv)
{
CallbackData data;
ClutterActor *stub_actor, *label;
gchar *file;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
data.current_clip.type = CLIP_NONE;
data.clips = NULL;
data.stage = clutter_stage_new ();
clutter_stage_set_title (CLUTTER_STAGE (data.stage), "Clipping");
g_signal_connect (data.stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
stub_actor = clutter_rectangle_new ();
clutter_container_add (CLUTTER_CONTAINER (data.stage), stub_actor, NULL);
file = g_build_filename (TESTS_DATADIR, "redhand.png", NULL);
data.hand = cogl_texture_new_from_file (file,
COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_ANY,
NULL);
g_free (file);
label = clutter_text_new_with_text ("Sans 12px", instructions);
clutter_text_set_line_wrap (CLUTTER_TEXT (label), TRUE);
clutter_actor_set_width (label, clutter_actor_get_width (data.stage) - 310);
clutter_actor_set_y (label,
clutter_actor_get_height (data.stage)
- clutter_actor_get_height (label));
clutter_container_add (CLUTTER_CONTAINER (data.stage), label, NULL);
g_signal_connect (stub_actor, "paint", G_CALLBACK (on_paint), &data);
g_signal_connect (data.stage, "button-press-event",
G_CALLBACK (on_button_press), &data);
g_signal_connect (data.stage, "button-release-event",
G_CALLBACK (on_button_release), &data);
g_signal_connect (data.stage, "motion-event",
G_CALLBACK (on_motion), &data);
g_signal_connect (data.stage, "key-press-event",
G_CALLBACK (on_key_press), &data);
clutter_actor_show (data.stage);
clutter_main ();
cogl_handle_unref (data.hand);
free_clips (&data);
return 0;
}
G_MODULE_EXPORT const char *
test_clip_describe (void)
{
return "Actor clipping with various techniques";
}