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#include "demo2layout.h"
#include "four_point_transform.h"
struct _Demo2Layout
{
GtkLayoutManager parent_instance;
float position;
float offset;
};
struct _Demo2LayoutClass
{
GtkLayoutManagerClass parent_class;
};
G_DEFINE_TYPE (Demo2Layout, demo2_layout, GTK_TYPE_LAYOUT_MANAGER)
static void
demo2_layout_measure (GtkLayoutManager *layout_manager,
GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkWidget *child;
int minimum_size = 0;
int natural_size = 0;
for (child = gtk_widget_get_first_child (widget);
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
int child_min = 0, child_nat = 0;
if (!gtk_widget_should_layout (child))
continue;
gtk_widget_measure (child, orientation, -1,
&child_min, &child_nat,
NULL, NULL);
minimum_size = MAX (minimum_size, child_min);
natural_size = MAX (natural_size, child_nat);
}
*minimum = minimum_size;
*natural = 3 * natural_size;
}
#define RADIANS(angle) ((angle)*M_PI/180.0);
/* Spherical coordinates */
#define SX(r,t,p) ((r) * sin (t) * cos (p))
#define SZ(r,t,p) ((r) * sin (t) * sin (p))
#define SY(r,t,p) ((r) * cos (t))
static double
map_offset (double x)
{
x = fmod (x, 180.0);
if (x < 0.0)
x += 180.0;
return x;
}
static void
demo2_layout_allocate (GtkLayoutManager *layout_manager,
GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkWidget *child;
GtkRequisition child_req;
int i, j, k;
float x0, y0;
float w, h;
graphene_point3d_t p1, p2, p3, p4;
graphene_point3d_t q1, q2, q3, q4;
double t_1, t_2, p_1, p_2;
double r;
graphene_matrix_t m;
GskTransform *transform;
double position = DEMO2_LAYOUT (layout_manager)->position;
double offset = DEMO2_LAYOUT (layout_manager)->offset;
/* for simplicity, assume all children are the same size */
gtk_widget_get_preferred_size (gtk_widget_get_first_child (widget), &child_req, NULL);
w = child_req.width;
h = child_req.height;
r = 300;
x0 = y0 = 300;
for (child = gtk_widget_get_first_child (widget), i = 0;
child != NULL;
child = gtk_widget_get_next_sibling (child), i++)
{
j = i / 36;
k = i % 36;
gtk_widget_set_child_visible (child, FALSE);
graphene_point3d_init (&p1, w, h, 1.);
graphene_point3d_init (&p2, w, 0., 1.);
graphene_point3d_init (&p3, 0., 0., 1.);
graphene_point3d_init (&p4, 0., h, 1.);
t_1 = RADIANS (map_offset (offset + 10 * j));
t_2 = RADIANS (map_offset (offset + 10 * (j + 1)));
p_1 = RADIANS (position + 10 * k);
p_2 = RADIANS (position + 10 * (k + 1));
if (t_2 < t_1)
continue;
if (SZ (r, t_1, p_1) > 0 ||
SZ (r, t_2, p_1) > 0 ||
SZ (r, t_1, p_2) > 0 ||
SZ (r, t_2, p_2) > 0)
continue;
gtk_widget_set_child_visible (child, TRUE);
graphene_point3d_init (&q1, x0 + SX (r, t_1, p_1), y0 + SY (r, t_1, p_1), SZ (r, t_1, p_1));
graphene_point3d_init (&q2, x0 + SX (r, t_2, p_1), y0 + SY (r, t_2, p_1), SZ (r, t_2, p_1));
graphene_point3d_init (&q3, x0 + SX (r, t_2, p_2), y0 + SY (r, t_2, p_2), SZ (r, t_2, p_2));
graphene_point3d_init (&q4, x0 + SX (r, t_1, p_2), y0 + SY (r, t_1, p_2), SZ (r, t_1, p_2));
/* Get a matrix that moves p1 -> q1, p2 -> q2, ... */
perspective_3d (&p1, &p2, &p3, &p4,
&q1, &q2, &q3, &q4,
&m);
transform = gsk_transform_matrix (NULL, &m);
/* Since our matrix was built for transforming points with z = 1,
* prepend a translation to the z = 1 plane.
*/
transform = gsk_transform_translate_3d (transform,
&GRAPHENE_POINT3D_INIT (0, 0, 1));
gtk_widget_allocate (child, w, h, -1, transform);
}
}
static GtkSizeRequestMode
demo2_layout_get_request_mode (GtkLayoutManager *layout_manager,
GtkWidget *widget)
{
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
}
static void
demo2_layout_class_init (Demo2LayoutClass *klass)
{
GtkLayoutManagerClass *layout_class = GTK_LAYOUT_MANAGER_CLASS (klass);
layout_class->get_request_mode = demo2_layout_get_request_mode;
layout_class->measure = demo2_layout_measure;
layout_class->allocate = demo2_layout_allocate;
}
static void
demo2_layout_init (Demo2Layout *self)
{
}
GtkLayoutManager *
demo2_layout_new (void)
{
return g_object_new (DEMO2_TYPE_LAYOUT, NULL);
}
void
demo2_layout_set_position (Demo2Layout *layout,
float position)
{
layout->position = position;
}
float
demo2_layout_get_position (Demo2Layout *layout)
{
return layout->position;
}
void
demo2_layout_set_offset (Demo2Layout *layout,
float offset)
{
layout->offset = offset;
}
float
demo2_layout_get_offset (Demo2Layout *layout)
{
return layout->offset;
}
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