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/*
Copyright (C) 2007 Paul Davis
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __gnome_canvas_lineset_h__
#define __gnome_canvas_lineset_h__
#include <stdint.h>
#include <libgnomecanvasmm/item.h>
namespace Gnome {
namespace Canvas {
class LineSetClass : public Glib::Class {
public:
const Glib::Class& init();
static void class_init_function(void* g_class, void* class_data);
};
/** A canvas item that displays a set of vertical or horizontal lines,
* spanning the entire size of the item.
*/
class LineSet : public Item {
public:
enum Orientation {
Vertical,
Horizontal
};
LineSet(Group& parent, Orientation);
virtual ~LineSet();
Glib::PropertyProxy<double> property_x1() { return x1.get_proxy(); }
Glib::PropertyProxy<double> property_y1() { return y1.get_proxy(); }
Glib::PropertyProxy<double> property_x2() { return x2.get_proxy(); }
Glib::PropertyProxy<double> property_y2() { return y2.get_proxy(); }
/* Note: every line operation takes a coord parameter, as an index to
* the line it modifies. The index will identify a line if it is between
* line.coord and line.coord + line.width.
*/
/** Move a line to a new position.
* For this to work (to move the desired line) it is important that
* lines have unique coordinates. This also applies to every line
* accessing functions below
*/
void move_line(double coord, double dest);
/** Change the width of a line.
* Only allow if the new width doesn't overlap the next line (see below)
*/
void change_line_width(double coord, double width);
/** Change the color of a line.
*/
void change_line_color(double coord, uint32_t color);
/** Add a line to draw.
* width is an offset, so that coord + width specifies the end of the line.
* lines should not overlap, as no layering information is provided.
* however, line_coord[i] + line_width[i] == line_coord[i+1] is
* be legal, as the coordinates are real numbers and represents
* real world coordinates. Two real world object sharing coordinates for start
* and end are not overlapping.
*/
void add_line(double coord, double width, uint32_t color);
/** Remove the line at coord
*/
void remove_line(double coord);
/** Remove all lines in a coordinate range
*/
void remove_lines(double c1, double c2);
/** Remove all lines with a coordinate lower than coord
*/
void remove_until(double coord);
/** Remove all lines with a coordinate equal to or higher than coord.
*/
void remove_from(double coord);
/** Remove all lines.
*/
void clear();
/** Add a set of lines in the given range.
* For every line visible in the provided coordinate range, call add_line().
* This is called when the area between c1 and c2 becomes visible, when
* previously outside any possible view.
* The number of calls to this function should be kept at a minimum.
*/
virtual void request_lines(double c1, double c2);
/** Instead of overriding the update_lines function one can connect to this
* and add lines externally instead.
* If add_lines() is overrided, this signal will not be emitted.
*/
sigc::signal<void, LineSet&, double, double> signal_request_lines;
/* overridden from Gnome::Canvas::Item */
void update_vfunc(double* affine, ArtSVP* clip_path, int flags);
void realize_vfunc();
void unrealize_vfunc();
void map_vfunc();
void unmap_vfunc();
void draw_vfunc(const Glib::RefPtr<Gdk::Drawable>& drawable, int x, int y, int width, int height);
void render_vfunc(GnomeCanvasBuf* buf);
double point_vfunc(double x, double y, int cx, int cy, GnomeCanvasItem** actual_item);
void bounds_vfunc(double* x1, double* y1, double* x2, double* y2);
bool on_event(GdkEvent* p1);
/* debug */
void print_lines();
protected:
struct Line {
Line(double c, double w, uint32_t color);
Line(double c);
void set_color(uint32_t color);
double coord;
double width;
unsigned char r;
unsigned char g;
unsigned char b;
unsigned char a;
};
static inline void paint_vert(GnomeCanvasBuf* buf, LineSet::Line& line, int x1, int y1, int x2, int y2);
static inline void paint_horiz(GnomeCanvasBuf* buf, LineSet::Line& line, int x1, int y1, int x2, int y2);
static bool line_compare(const Line& a, const Line& b);
typedef std::list<Line> Lines;
void bounds_need_update();
void region_needs_update(double coord1, double coord2);
bool update_bounds();
void update_lines(bool need_redraw);
void redraw_request (ArtDRect const &);
Lines::iterator line_at(double coord);
/** Stores last accessed line so adjacent lines are found faster */
Lines::iterator cached_pos;
static LineSetClass lineset_class;
Orientation orientation;
Lines lines;
/* properties */
Glib::Property<double> x1;
Glib::Property<double> y1;
Glib::Property<double> x2;
Glib::Property<double> y2;
/** Cached bounding box in canvas coordinates */
ArtIRect bbox;
private:
LineSet();
LineSet(const LineSet&);
bool in_update;
/* a range that needs update update1 > update2 ==> no update needed */
double update_region1;
double update_region2;
bool bounds_changed;
double covered1;
double covered2;
};
} /* namespace Canvas */
} /* namespace Gnome */
#endif /* __gnome_canvas_lineset_h__ */
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