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256 lines
9.2 KiB
C
256 lines
9.2 KiB
C
#include <stdlib.h>
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#include <gmodule.h>
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#include <clutter/clutter.h>
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#define RECT_SIZE 128
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#define H_PADDING 32
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#define V_PADDING 32
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enum
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{
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NorthWest, North, NorthEast,
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West, Center, East,
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SouthWest, South, SouthEast,
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N_RECTS
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};
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static ClutterActor *rects[N_RECTS] = { NULL, };
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static const gchar *colors[N_RECTS] = {
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"#8ae234", "#73d216", "#4e9a06",
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"#729fcf", "#3465a4", "#204a87",
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"#ef2929", "#cc0000", "#a40000"
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};
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static const gchar *names[N_RECTS] = {
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"North West", "North", "North East",
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"West", "Center", "East",
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"South West", "South", "South East"
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};
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static const gchar *desaturare_glsl_shader =
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"uniform sampler2D tex;\n"
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"uniform float factor;\n"
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"\n"
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"vec3 desaturate (const vec3 color, const float desaturation)\n"
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"{\n"
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" const vec3 gray_conv = vec3 (0.299, 0.587, 0.114);\n"
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" vec3 gray = vec3 (dot (gray_conv, color));\n"
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" return vec3 (mix (color.rgb, gray, desaturation));\n"
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"}\n"
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"\n"
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"void main ()\n"
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"{\n"
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" vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));\n"
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" color.rgb = desaturate (color.rgb, factor);\n"
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" cogl_color_out = color;\n"
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"}\n";
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static gboolean is_expanded = FALSE;
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static gboolean
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on_button_release (ClutterActor *actor,
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ClutterEvent *event,
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gpointer data G_GNUC_UNUSED)
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{
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if (!is_expanded)
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{
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gfloat north_offset, south_offset;
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gfloat west_offset, east_offset;
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/* expand the 8 rectangles by animating the offset of the
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* bind constraints
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*/
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north_offset = (clutter_actor_get_height (rects[Center]) + V_PADDING)
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* -1.0f;
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south_offset = (clutter_actor_get_height (rects[Center]) + V_PADDING);
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west_offset = (clutter_actor_get_width (rects[Center]) + H_PADDING)
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* -1.0f;
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east_offset = (clutter_actor_get_width (rects[Center]) + H_PADDING);
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clutter_actor_animate (rects[NorthWest], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", west_offset,
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"@constraints.y-bind.offset", north_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[North], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.y-bind.offset", north_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[NorthEast], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", east_offset,
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"@constraints.y-bind.offset", north_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[West], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", west_offset,
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"reactive", TRUE,
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NULL);
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/* turn on the desaturation effect and set the center
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* rectangle not reactive
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*/
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clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
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"@effects.desaturate.enabled", TRUE,
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"reactive", FALSE,
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NULL);
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clutter_actor_animate (rects[East], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", east_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[SouthWest], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", west_offset,
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"@constraints.y-bind.offset", south_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[South], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.y-bind.offset", south_offset,
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"reactive", TRUE,
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NULL);
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clutter_actor_animate (rects[SouthEast], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 255,
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"@constraints.x-bind.offset", east_offset,
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"@constraints.y-bind.offset", south_offset,
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"reactive", TRUE,
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NULL);
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}
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else
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{
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gint i;
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clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
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"@effects.desaturate.enabled", FALSE,
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"reactive", TRUE,
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NULL);
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for (i = NorthWest; i < N_RECTS; i++)
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{
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if (i == Center)
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continue;
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/* put the 8 rectangles back into their initial state */
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clutter_actor_animate (rects[i], CLUTTER_EASE_OUT_EXPO, 500,
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"opacity", 0,
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"@constraints.x-bind.offset", 0.0f,
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"@constraints.y-bind.offset", 0.0f,
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"reactive", FALSE,
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NULL);
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}
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}
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is_expanded = !is_expanded;
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g_print ("Selected: [%s]\n", clutter_actor_get_name (actor));
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return TRUE;
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}
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G_MODULE_EXPORT int
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test_constraints_main (int argc, char *argv[])
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{
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ClutterActor *stage, *rect;
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ClutterConstraint *constraint;
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ClutterEffect *effect;
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ClutterColor rect_color;
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gint i;
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if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
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return 1;
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stage = clutter_stage_new ();
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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clutter_stage_set_title (CLUTTER_STAGE (stage), "Constraints");
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clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
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clutter_actor_set_size (stage, 800, 600);
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/* main rectangle */
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clutter_color_from_string (&rect_color, "#3465a4");
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rect = clutter_rectangle_new ();
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g_signal_connect (rect, "button-release-event",
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G_CALLBACK (on_button_release),
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NULL);
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clutter_rectangle_set_color (CLUTTER_RECTANGLE (rect), &rect_color);
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clutter_actor_set_size (rect, RECT_SIZE, RECT_SIZE);
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clutter_actor_set_reactive (rect, TRUE);
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clutter_actor_set_name (rect, names[Center]);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
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/* align the center rectangle to the center of the stage */
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constraint = clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5);
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clutter_actor_add_constraint_with_name (rect, "x-align", constraint);
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constraint = clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5);
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clutter_actor_add_constraint_with_name (rect, "y-align", constraint);
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/* this is the equivalent of the DesaturateEffect; we cannot animate
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* the factor because the animation API only understands GObject
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* properties; so we use the ActorMeta:enabled property to toggle
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* the shader
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*/
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effect = clutter_shader_effect_new (CLUTTER_FRAGMENT_SHADER);
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clutter_shader_effect_set_shader_source (CLUTTER_SHADER_EFFECT (effect),
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desaturare_glsl_shader);
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clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
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"tex", G_TYPE_INT, 1, 0);
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clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
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"factor", G_TYPE_FLOAT, 1, 0.66);
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clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE);
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clutter_actor_add_effect_with_name (rect, "desaturate", effect);
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rects[Center] = rect;
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/* build the other rectangles, and bind their position and size
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* to the center rectangle. we are going to animate the offset
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* of the BindConstraints
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*/
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for (i = 0; i < N_RECTS; i++)
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{
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if (i == Center)
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continue;
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clutter_color_from_string (&rect_color, colors[i]);
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rect = clutter_rectangle_new ();
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clutter_rectangle_set_color (CLUTTER_RECTANGLE (rect), &rect_color);
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clutter_actor_set_opacity (rect, 0);
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clutter_actor_set_name (rect, names[i]);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
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constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_X, 0.0);
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clutter_actor_add_constraint_with_name (rect, "x-bind", constraint);
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constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_Y, 0.0);
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clutter_actor_add_constraint_with_name (rect, "y-bind", constraint);
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constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_SIZE, 0.0);
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clutter_actor_add_constraint_with_name (rect, "size-bind", constraint);
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g_signal_connect (rect, "button-release-event",
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G_CALLBACK (on_button_release),
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NULL);
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rects[i] = rect;
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}
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clutter_actor_show (stage);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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G_MODULE_EXPORT const char *
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test_constraints_describe (void)
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{
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return "Visualize usage of Bind and Align constraints";
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}
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