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