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/*
* tool_image.c
*
* Colloquium - A tiny presentation program
*
* Copyright (c) 2011 Thomas White <taw@bitwiz.org.uk>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <gdk/gdkkeysyms.h>
#include "presentation.h"
#include "objects.h"
#include "mainwindow.h"
#include "slide_render.h"
enum image_drag_reason
{
IMAGE_DRAG_REASON_NONE,
IMAGE_DRAG_REASON_RESIZE,
};
struct image_toolinfo
{
struct toolinfo base;
enum image_drag_reason drag_reason;
enum corner drag_corner;
double box_x;
double box_y;
double box_width;
double box_height;
double drag_initial_x;
double drag_initial_y;
};
struct image_object
{
struct object base;
struct image *image;
GdkPixbuf *scaled_pb;
int scaled_w;
int scaled_h;
double diagonal_length;
};
static void update_image(struct image_object *o)
{
struct image *i = o->image;
int w, h;
/* Fit the width and calculate the height */
w = o->base.bb_width;
h = ((double)i->height / i->width) * o->base.bb_width;
if ( h > o->base.bb_height ) {
h = o->base.bb_height;
w = ((double)i->width / i->height) * o->base.bb_height;
}
if ( (o->scaled_w != w) || (o->scaled_h != h) ) {
if ( o->scaled_pb != NULL ) gdk_pixbuf_unref(o->scaled_pb);
o->scaled_pb = gdk_pixbuf_scale_simple(i->pb, w, h,
GDK_INTERP_BILINEAR);
} /* else the size didn't change */
}
static void render_image_object(cairo_t *cr, struct object *op)
{
struct image_object *o = (struct image_object *)op;
cairo_new_path(cr);
cairo_rectangle(cr, op->x, op->y, op->bb_width, op->bb_height);
gdk_cairo_set_source_pixbuf(cr, o->scaled_pb, op->x, op->y);
cairo_fill(cr);
}
static void update_image_object(struct object *op)
{
struct image_object *o = (struct image_object *)op;
update_image(o);
}
static void delete_image_object(struct object *op)
{
struct image_object *o = (struct image_object *)op;
if ( o->scaled_pb != NULL ) gdk_pixbuf_unref(o->scaled_pb);
unref_image(o->image);
}
static void serialize(struct object *op, struct serializer *ser)
{
struct image_object *o = (struct image_object *)op;
serialize_f(ser, "x", op->x);
serialize_f(ser, "y", op->y);
serialize_f(ser, "w", op->bb_width);
serialize_f(ser, "h", op->bb_height);
serialize_s(ser, "filename", o->image->filename);
}
static struct image_object *new_image_object(double x, double y,
double bb_width, double bb_height,
char *filename, struct style *sty,
struct image_store *is,
struct image_toolinfo *ti)
{
struct image_object *new;
new = calloc(1, sizeof(*new));
if ( new == NULL ) return NULL;
/* Base properties */
new->base.x = x; new->base.y = y;
new->base.bb_width = bb_width;
new->base.bb_height = bb_height;
new->base.type = OBJ_IMAGE;
new->base.empty = 0;
new->base.parent = NULL;
new->base.style = sty;
new->scaled_pb = NULL;
new->image = get_image(is, filename);
if ( new->image == NULL ) {
free(new);
printf("Failed to load or get image.\n");
return NULL;
}
/* Methods for this object */
new->base.render_object = render_image_object;
new->base.delete_object = delete_image_object;
new->base.update_object = update_image_object;
new->base.serialize = serialize;
return new;
}
struct object *add_image_object(struct slide *s, double x, double y,
double bb_width, double bb_height,
char *filename, struct style *sty,
struct image_store *is,
struct image_toolinfo *ti)
{
struct image_object *new;
new = new_image_object(x, y, bb_width, bb_height,
filename, sty, is, ti);
if ( new == NULL ) return NULL;
new->base.parent = s;
if ( add_object_to_slide(s, (struct object *)new) ) {
free(new);
return NULL;
}
update_image(new);
redraw_slide(s);
return (struct object *)new;
}
static void calculate_box_size(struct object *o, double x, double y,
struct image_toolinfo *ti)
{
double ddx, ddy, dlen, mult;
double vx, vy, dbx, dby;
struct image_object *to = (struct image_object *)o;
ddx = x - ti->drag_initial_x;
ddy = y - ti->drag_initial_y;
switch ( ti->drag_corner ) {
case CORNER_BR :
vx = o->bb_width;
vy = o->bb_height;
break;
case CORNER_BL :
vx = -o->bb_width;
vy = o->bb_height;
break;
case CORNER_TL :
vx = -o->bb_width;
vy = -o->bb_height;
break;
case CORNER_TR :
vx = o->bb_width;
vy = -o->bb_height;
break;
case CORNER_NONE :
default:
vx = 0.0;
vy = 0.0;
break;
}
dlen = (ddx*vx + ddy*vy) / to->diagonal_length;
mult = (dlen+to->diagonal_length) / to->diagonal_length;
ti->box_width = o->bb_width * mult;
ti->box_height = o->bb_height * mult;
dbx = ti->box_width - o->bb_width;
dby = ti->box_height - o->bb_height;
if ( ti->box_width < 40.0 ) {
mult = 40.0 / o->bb_width;
}
if ( ti->box_height < 40.0 ) {
mult = 40.0 / o->bb_height;
}
ti->box_width = o->bb_width * mult;
ti->box_height = o->bb_height * mult;
dbx = ti->box_width - o->bb_width;
dby = ti->box_height - o->bb_height;
switch ( ti->drag_corner ) {
case CORNER_BR :
ti->box_x = o->x;
ti->box_y = o->y;
break;
case CORNER_BL :
ti->box_x = o->x - dbx;
ti->box_y = o->y;
break;
case CORNER_TL :
ti->box_x = o->x - dbx;
ti->box_y = o->y - dby;
break;
case CORNER_TR :
ti->box_x = o->x;
ti->box_y = o->y - dby;
break;
case CORNER_NONE :
break;
}
}
static void click_select(struct presentation *p, struct toolinfo *tip,
double x, double y, GdkEventButton *event,
enum drag_status *drag_status,
enum drag_reason *drag_reason)
{
enum corner c;
struct image_toolinfo *ti = (struct image_toolinfo *)tip;
struct image_object *o = (struct image_object *)p->editing_object;
assert(o->base.type == OBJ_IMAGE);
/* Within the resizing region? */
c = which_corner(x, y, &o->base);
if ( c != CORNER_NONE )
{
ti->drag_reason = IMAGE_DRAG_REASON_RESIZE;
ti->drag_corner = c;
ti->drag_initial_x = x;
ti->drag_initial_y = y;
o->diagonal_length = pow(o->base.bb_width, 2.0);
o->diagonal_length += pow(o->base.bb_height, 2.0);
o->diagonal_length = sqrt(o->diagonal_length);
calculate_box_size((struct object *)o, x, y, ti);
/* Tell the MCP what we did, and return */
*drag_status = DRAG_STATUS_DRAGGING;
*drag_reason = DRAG_REASON_TOOL;
return;
}
}
static void drag(struct toolinfo *tip, struct presentation *p,
struct object *o, double x, double y)
{
struct image_toolinfo *ti = (struct image_toolinfo *)tip;
if ( ti->drag_reason == IMAGE_DRAG_REASON_RESIZE ) {
calculate_box_size(o, x, y, ti);
redraw_overlay(p);
}
}
static void end_drag(struct toolinfo *tip, struct presentation *p,
struct object *o, double x, double y)
{
struct image_toolinfo *ti = (struct image_toolinfo *)tip;
calculate_box_size((struct object *)o, x, y, ti);
o->x = ti->box_x;
o->y = ti->box_y;
o->bb_width = ti->box_width;
o->bb_height = ti->box_height;
update_image((struct image_object *)o);
redraw_slide(o->parent);
ti->drag_reason = IMAGE_DRAG_REASON_NONE;
}
static void create_region(struct toolinfo *tip, struct presentation *p,
double x1, double y1, double x2, double y2)
{
//struct object *n;
//struct image_toolinfo *ti = (struct image_toolinfo *)tip;
//struct image_object *o;
/* FIXME: Open an "Open file" dialogue box and use the result */
}
static void select_object(struct object *o, struct toolinfo *tip)
{
/* Do nothing */
}
static int deselect_object(struct object *o, struct toolinfo *tip)
{
if ( (o != NULL) && o->empty ) {
delete_object(o);
return 1;
}
return 0;
}
static void draw_overlay(struct toolinfo *tip, cairo_t *cr, struct object *n)
{
struct image_toolinfo *ti = (struct image_toolinfo *)tip;
//struct image_object *o = (struct image_object *)n;
if ( n != NULL ) {
draw_editing_box(cr, n->x, n->y, n->bb_width, n->bb_height);
/* Draw resize handles */
draw_resize_handle(cr, n->x, n->y+n->bb_height-20.0);
draw_resize_handle(cr, n->x+n->bb_width-20.0, n->y);
draw_resize_handle(cr, n->x, n->y);
draw_resize_handle(cr, n->x+n->bb_width-20.0,
n->y+n->bb_height-20.0);
}
if ( ti->drag_reason == IMAGE_DRAG_REASON_RESIZE ) {
draw_rubberband_box(cr, ti->box_x, ti->box_y,
ti->box_width, ti->box_height);
}
}
static void key_pressed(struct object *o, guint keyval, struct toolinfo *tip)
{
/* Do nothing */
}
static void im_commit(struct object *o, gchar *str, struct toolinfo *tip)
{
/* Do nothing */
}
static int valid_object(struct object *o)
{
if ( o->type == OBJ_IMAGE ) return 1;
return 0;
}
static struct object *deserialize(struct presentation *p, struct ds_node *root,
struct toolinfo *tip)
{
struct image_object *o;
double x, y, w, h;
char *filename;
struct image_toolinfo *ti = (struct image_toolinfo *)tip;
if ( get_field_f(root, "x", &x) ) {
fprintf(stderr,
"Couldn't find x position for object '%s'\n",
root->key);
return NULL;
}
if ( get_field_f(root, "y", &y) ) {
fprintf(stderr,
"Couldn't find y position for object '%s'\n",
root->key);
return NULL;
}
if ( get_field_f(root, "w", &w) ) {
fprintf(stderr,
"Couldn't find width for object '%s'\n",
root->key);
return NULL;
}
if ( get_field_f(root, "h", &h) ) {
fprintf(stderr,
"Couldn't find height for object '%s'\n",
root->key);
return NULL;
}
if ( get_field_s(root, "filename", &filename) ) {
fprintf(stderr, "Couldn't find filename for object '%s'\n",
root->key);
return NULL;
}
o = new_image_object(x, y, w, h, filename,
p->ss->styles[0], p->image_store, ti);
free(filename);
return (struct object *)o;
}
struct toolinfo *initialise_image_tool()
{
struct image_toolinfo *ti;
ti = malloc(sizeof(*ti));
ti->base.click_select = click_select;
ti->base.create_default = NULL;
ti->base.select = select_object;
ti->base.deselect = deselect_object;
ti->base.drag = drag;
ti->base.end_drag = end_drag;
ti->base.create_region = create_region;
ti->base.draw_editing_overlay = draw_overlay;
ti->base.key_pressed = key_pressed;
ti->base.im_commit = im_commit;
ti->base.valid_object = valid_object;
ti->base.deserialize = deserialize;
return (struct toolinfo *)ti;
}
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