#include <cmath></cmath>

#include "activepoint.h"

#include "context.h"

Real Context::pixelsize_sqr() const {

	Cairo::Matrix m;

	ctx()->get_matrix(m);

	return 0.25*sqrt(m.xx*m.xx + m.xy*m.xy + m.yx*m.yx + m.yy*m.yy);

}

Real Context::pixelsize() const {

	return sqrt(pixelsize_sqr());

}

void Context::point(const ActivePoint &point) const {

	if (!point.visible) return;

	Color color = point.color;

	Color stroke_color = Color::black();

	if (!point.enabled) {

		color = color.mergecolor(Color::gray()).mulalpha();

		stroke_color = stroke_color.mergecolor(Color::gray()).mulalpha();

	}

	ctx()->save();

	ctx()->arc(point.position.x, point.position.y, point.radius, 0, 2*pi);

	set_source_rgba(color);

	ctx()->fill_preserve();

	set_line_width_px(point.active ? 2 : 1);

	set_source_rgba(stroke_color);

	ctx()->stroke();

	ctx()->restore();

}

void Context::segment(const Segment &segment) const {

	line_to(segment.p0);

	Vector b0 = segment.p0 + segment.t0/3;

	Vector b1 = segment.p1 - segment.t1/3;

	ctx()->curve_to(b0.x, b0.y, b1.x, b1.y, segment.p1.x, segment.p1.y);

}