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livetrax/gtk2_ardour/canvas-simpleline.c
David Robillard ed626628b5 Delete trailing whitespace 
git-svn-id: svn://localhost/ardour2/branches/3.0@9656 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-06-01 17:00:29 +00:00

460 lines
12 KiB
C
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#include <stdio.h>
#include <math.h>
#include <cairo.h>
#include <libgnomecanvas/libgnomecanvas.h>
#include "canvas-simpleline.h"
#include "rgb_macros.h"
#include "gettext.h"
#define _(Text) dgettext (PACKAGE,Text)
enum {
PROP_0,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_COLOR_RGBA
};
static void gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class);
static void gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline);
static void gnome_canvas_simpleline_destroy (GtkObject *object);
static void gnome_canvas_simpleline_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gnome_canvas_simpleline_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gnome_canvas_simpleline_update (GnomeCanvasItem *item,
double *affine,
ArtSVP *clip_path,
int flags);
static void gnome_canvas_simpleline_bounds (GnomeCanvasItem *item,
double *x1,
double *y1,
double *x2,
double *y2);
static double gnome_canvas_simpleline_point (GnomeCanvasItem *item,
double x,
double y,
int cx,
int cy,
GnomeCanvasItem **actual_item);
static void gnome_canvas_simpleline_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buf);
static void gnome_canvas_simpleline_draw (GnomeCanvasItem *item,
GdkDrawable *drawable,
int x,
int y,
int w,
int h);
static GnomeCanvasItemClass *parent_class;
GType
gnome_canvas_simpleline_get_type (void)
{
static GType simpleline_type;
if (!simpleline_type) {
static const GTypeInfo object_info = {
sizeof (GnomeCanvasSimpleLineClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_simpleline_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasSimpleLine),
0, /* n_preallocs */
(GInstanceInitFunc) gnome_canvas_simpleline_init,
NULL /* value_table */
};
simpleline_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasSimpleLine",
&object_info, 0);
}
return simpleline_type;
}
static void
gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
GnomeCanvasItemClass *item_class;
gobject_class = (GObjectClass *) class;
object_class = (GtkObjectClass *) class;
item_class = (GnomeCanvasItemClass *) class;
parent_class = g_type_class_peek_parent (class);
gobject_class->set_property = gnome_canvas_simpleline_set_property;
gobject_class->get_property = gnome_canvas_simpleline_get_property;
g_object_class_install_property (gobject_class,
PROP_X1,
g_param_spec_double ("x1",
_("x1"),
_("x coordinate of upper left corner of rect"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_Y1,
g_param_spec_double ("y1",
_("y1"),
_("y coordinate of upper left corner of rect "),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_X2,
g_param_spec_double ("x2",
_("x2"),
_("x coordinate of lower right corner of rect"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_Y2,
g_param_spec_double ("y2",
_("y2"),
_("y coordinate of lower right corner of rect "),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_COLOR_RGBA,
g_param_spec_uint ("color_rgba",
_("color rgba"),
_("color of line"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE));
object_class->destroy = gnome_canvas_simpleline_destroy;
item_class->update = gnome_canvas_simpleline_update;
item_class->bounds = gnome_canvas_simpleline_bounds;
item_class->point = gnome_canvas_simpleline_point;
item_class->render = gnome_canvas_simpleline_render;
item_class->draw = gnome_canvas_simpleline_draw;
}
static void
gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline)
{
simpleline->x1 = 0.0;
simpleline->y1 = 0.0;
simpleline->x2 = 0.0;
simpleline->y2 = 0.0;
simpleline->color = RGBA_TO_UINT(98,123,174,241);
}
static void
gnome_canvas_simpleline_destroy (GtkObject *object)
{
GnomeCanvasSimpleLine *line;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
line = GNOME_CANVAS_SIMPLELINE (object);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
/*
* CANVAS CALLBACKS
*/
static void
gnome_canvas_simpleline_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
(void) pspec;
GnomeCanvasSimpleLine *simpleline;
int update = FALSE;
int bounds_changed = FALSE;
double d;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
simpleline = GNOME_CANVAS_SIMPLELINE (object);
switch (prop_id) {
case PROP_X1:
d = g_value_get_double (value);
if (simpleline->x1 != d) {
simpleline->x1 = d;
bounds_changed = TRUE;
}
break;
case PROP_Y1:
d = g_value_get_double (value);
if (simpleline->y1 != d) {
simpleline->y1 = d;
bounds_changed = TRUE;
}
break;
case PROP_X2:
d = g_value_get_double (value);
if (simpleline->x2 != d) {
simpleline->x2 = d;
bounds_changed = TRUE;
}
break;
case PROP_Y2:
d = g_value_get_double (value);
if (simpleline->y2 != d) {
simpleline->y2 = d;
bounds_changed = TRUE;
}
break;
case PROP_COLOR_RGBA:
if (simpleline->color != g_value_get_uint(value)) {
simpleline->color = g_value_get_uint(value);
UINT_TO_RGBA (simpleline->color, &simpleline->r, &simpleline->g, &simpleline->b, &simpleline->a);
update = TRUE;
}
break;
default:
break;
}
if (update || bounds_changed) {
gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(object));
}
}
static void
gnome_canvas_simpleline_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
GnomeCanvasSimpleLine *line = GNOME_CANVAS_SIMPLELINE (object);
switch (prop_id) {
case PROP_X1:
g_value_set_double (value, line->x1);
break;
case PROP_X2:
g_value_set_double (value, line->x2);
break;
case PROP_Y1:
g_value_set_double (value, line->y1);
break;
case PROP_Y2:
g_value_set_double (value, line->y2);
break;
case PROP_COLOR_RGBA:
g_value_set_uint (value, line->color);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gnome_canvas_simpleline_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
GnomeCanvasSimpleLine *simpleline;
double x1, x2, y1, y2;
simpleline = GNOME_CANVAS_SIMPLELINE (item);
if (parent_class->update)
(* parent_class->update) (item, affine, clip_path, flags);
/* redraw old location */
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
/* get current bounding box in parent-relative world coordinates */
gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
/* convert parent-relative item coordinates to world coordinates */
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
/* don't suffer from rounding errors */
x1 = floor (x1);
y1 = floor (y1);
x2 = ceil (x2);
y2 = ceil (y2);
/* force non-zero dimensionality for both axes */
if (x1 == x2) {
x2 += 1.0;
}
if (y1 == y2) {
y2 += 1.0;
}
/* reset item bounding box (canvas coordinates, so integral. but stored in doubles) */
gnome_canvas_w2c_d (GNOME_CANVAS(item->canvas), x1, y1, &item->x1, &item->y1);
gnome_canvas_w2c_d (GNOME_CANVAS(item->canvas), x2, y2, &item->x2, &item->y2);
/* redraw new location */
gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
/* store actual line coords as canvas coordinates for use in render() */
x1 = simpleline->x1;
y1 = simpleline->y1;
x2 = simpleline->x2;
y2 = simpleline->y2;
/* convert to world */
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
/* avoid rounding errors */
x1 = (int) floor (item->x1);
y1 = (int) floor (item->y1);
x2 = (int) ceil (item->x2);
y2 = (int) ceil (item->y2);
/* convert to canvas coordinates, integral, stored in integers */
gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x1, y1, &simpleline->cx1, &simpleline->cy1);
gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x2, y2, &simpleline->cx2, &simpleline->cy2);
}
static void
gnome_canvas_simpleline_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buf)
{
GnomeCanvasSimpleLine *simpleline;
int x1, x2;
int y1, y2;
simpleline = GNOME_CANVAS_SIMPLELINE (item);
x1 = simpleline->cx1;
x2 = simpleline->cx2;
y1 = simpleline->cy1;
if (buf->is_bg) {
gnome_canvas_buf_ensure_buf (buf);
buf->is_bg = FALSE;
}
if (simpleline->x1 != simpleline->x2) {
PAINT_HORIZA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
x1, x2, y1);
} else {
y2 = simpleline->cy2;
PAINT_VERTA (buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
x1, y1, y2);
}
}
static void
gnome_canvas_simpleline_draw (GnomeCanvasItem *item,
GdkDrawable *drawable,
int x, int y,
int width, int height)
{
GnomeCanvasSimpleLine *simpleline;
simpleline = GNOME_CANVAS_SIMPLELINE (item);
/* XXX not implemented */
}
static void
gnome_canvas_simpleline_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
GnomeCanvasSimpleLine *simpleline = GNOME_CANVAS_SIMPLELINE (item);
*x1 = simpleline->x1;
*y1 = simpleline->y1;
*x2 = simpleline->x1;
*y2 = simpleline->y2;
}
static double
gnome_canvas_simpleline_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
{
(void) cx;
(void) cy;
GnomeCanvasSimpleLine *simpleline;
double x1, y1, x2, y2;
double dx, dy;
simpleline = GNOME_CANVAS_SIMPLELINE (item);
*actual_item = item;
/* Find the bounds for the line */
gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
/* Is point inside line */
if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
return 0.0;
}
/* Point is outside line */
if (x < x1)
dx = x1 - x;
else if (x > x2)
dx = x - x2;
else
dx = 0.0;
if (y < y1)
dy = y1 - y;
else if (y > y2)
dy = y - y2;
else
dy = 0.0;
return sqrt (dx * dx + dy * dy);
}
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