#include "view.h"

#include <gtkmm container.h=""></gtkmm>

void

View::Point::draw(

	const Cairo::RefPtr<cairo::context>& context,</cairo::context>

	View &view )

{

	const Real ps = view.get_pixel_size();

	context->save();

	context->arc(position.x, position.y, radius*ps, 0.0, 2.0*M_PI);

	context->set_source_rgba(color.r, color.g, color.b, color.a);

	context->fill_preserve();

	context->set_source_rgba(0.0, 0.0, 0.0, color.a);

	context->set_line_width(selected ? 2.0*ps : ps);

	context->stroke();

	context->restore();

}

View::View():

	dragging()

{

	set_events(

		Gdk::POINTER_MOTION_MASK

	  | Gdk::BUTTON_PRESS_MASK

	  | Gdk::BUTTON_RELEASE_MASK );

	signal_draw_view.connect(sigc::mem_fun(*this, &View::on_draw_view));

	signal_point_motion.connect(sigc::mem_fun(*this, &View::on_point_motion));

	signal_point_changed.connect(sigc::mem_fun(*this, &View::on_point_changed));

	signal_transform_changed.connect(sigc::mem_fun(*this, &View::on_transform_changed));

}

View::~View() { }

Real

View::get_pixel_size() const

	{ return 1.0/sqrt(fabs(transform.m00 * transform.m11)); }

Pair2

View::get_bounds() const {

	Matrix m = transform_from_pixels();

	return Pair2(

		(m*Vector4(0          , 0           , 0, 1)).vec2(),

		(m*Vector4(get_width(), get_height(), 0, 1)).vec2() );

}

Matrix

View::transform_to_pixels() const {

	Matrix matrix = transform;

	matrix.row_w().vec2() += Vector2(get_width(), get_height())*0.5;

	return matrix;

}

Matrix

View::transform_from_pixels() const

	{ return transform_to_pixels().inverted(); }

bool

View::on_draw(const Cairo::RefPtr<cairo::context>& context) {</cairo::context>

	context->save();

	const Real border_size = 1.0;

	const Real border_margin = 2.0;

	context->save();

	context->rectangle(0, 0, get_width(), get_height());

	context->set_source_rgba(0, 0, 0, 1);	

	context->fill();

	context->rectangle(

		border_margin, border_margin,

		get_width() - 2*border_margin,

		get_height() - 2*border_margin );

	context->set_line_width(border_size);

	context->set_source_rgba(1, 1, 0, 1);

	context->stroke();

	context->restore();

	context->transform( transform_to_pixels().to_cairo() );

	signal_draw_view(context);

	for(PointList::const_iterator i = points.begin(); i != points.end(); ++i)

		(*i)->draw(context, *this);

	context->restore();

	return true;

}

bool

View::on_motion_notify_event(GdkEventMotion *event) {

	Vector2 prev_mouse_position = mouse_position;

	mouse_position = Vector2(event->x, event->y);

	Matrix to_pixels = transform_to_pixels();

	Matrix from_pixels = transform_from_pixels();

	if (dragging) {

		if (selected_point) {

			selected_point->position = (from_pixels*Vector4(mouse_position + selected_point_offset, 0, 1)).vec2();

			point_motion(selected_point);

			queue_draw();

		}

		return true;

	}

	PointPtr point;

	for(PointList::iterator i = points.begin(); i != points.end(); ++i) {

		(*i)->selected = false;

		Vector2 point_position = (to_pixels*Vector4((*i)->position, 0, 1)).vec2();

		Vector2 offset = point_position - mouse_position;

		if (offset.square() <= (*i)->radius * (*i)->radius) {

			point = *i;

			selected_point_offset = offset;

		}

	}

	if (point)

		point->selected = true;

	if (selected_point != point) {

		selected_point = point;

		queue_draw();

	}

	if (event->state & Gdk::BUTTON2_MASK) {

		// translate

		transform.row_w() += Vector4(mouse_position - prev_mouse_position);

		queue_draw();

	}

	if (event->state & Gdk::BUTTON3_MASK) {

		// zoom

		Real scale = pow(2.0, (prev_mouse_position.y - mouse_position.y)/50.0); // zoom x2 by motion to 50 pixels

		Vector2 center = Vector2(transform.inverted() * Vector4(0, 0, 0, 1));

		transform.scale(scale, scale);

		transform.row_w() = Vector4(0, 0, 0, 1);

		transform.row_w() = transform * Vector4(-center, 0, 1);

		queue_draw();

	}

	return true;

}

bool

View::on_button_press_event(GdkEventButton *event) {

	if (event->button == 1)

		dragging = true;

	return true;

}

bool

View::on_button_release_event(GdkEventButton *event) {

	if (event->button == 1) {

		dragging = false;

		if (selected_point)

			point_changed(selected_point);

	}

	if (event->button == 2 || event->button == 3)

		signal_transform_changed();

	return true;

}

void

View::on_draw_view(const Cairo::RefPtr<cairo::context>&)</cairo::context>

	{ }

void

View::on_point_motion(const PointPtr&)

	{ }

void

View::on_point_changed(const PointPtr&)

	{ }

void

View::on_transform_changed()

	{ }