triangles/src/GuiTriangle.cpp

/**
 *  Triangles
 *  Copyright (C) 2016 POSITIVE MENTAL ATTITUDE
 *
 *  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, version 3 of the License.
 *
 *  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/>.
 */

#include <cmath>
#include "GuiTriangle.hpp"

GuiTriangle::GuiTriangle(): Triangle(), _scale(1.f)
{
	/// A default empty lambda.
	bind([](){});
}

bool GuiTriangle::mouseIntersection(sf::Vector2i mouseXY)
{	
	const double degree = 3.14159265358 / 180.;
	sf::Vector2f A = sf::Vector2f(std::sin((0.f + getRotation()) * degree) * getSize() * getScale().x, -std::cos((0.f + getRotation()) * degree) * getSize() * getScale().x) + getPosition(); 
	sf::Vector2f B = sf::Vector2f(std::sin((165.f + getRotation()) * degree) * getSize() * getScale().x, -std::cos((165.f + getRotation()) * degree) * getSize() * getScale().x) + getPosition(); 
	sf::Vector2f C = sf::Vector2f(std::sin((195.f + getRotation()) * degree) * getSize() * getScale().x, -std::cos((195.f + getRotation()) * degree) * getSize() * getScale().x) + getPosition(); 
	bool b0 = ((mouseXY.x - B.x) * (A.y - B.y) - (A.x - B.x) * (mouseXY.y - B.y)) < 0.f;
	bool b1 = ((mouseXY.x - C.x) * (B.y - C.y) - (B.x - C.x) * (mouseXY.y - C.y)) < 0.f;
	bool b2 = ((mouseXY.x - A.x) * (C.y - A.y) - (C.x - A.x) * (mouseXY.y - A.y)) < 0.f;

	return (b0 == b1 && b1 == b2);
}

float GuiTriangle::getWidth()
{
	return (std::sin((92.5 * 3.14159265358 / 180.) * getSize() * getScale().x)) - (std::sin((257.5 * 3.14159265358 / 180.)) * getSize() * getScale().x);
}

void GuiTriangle::click(sf::Vector2i mouseXY)
{
	if(mouseIntersection(mouseXY))
		onClick();
}

void GuiTriangle::update(sf::Vector2i mouseXY, sf::Time delta)
{
	if(mouseIntersection(mouseXY))
	{
		if(_scale < 1.2f)
		{
			_scale += delta.asSeconds() * (1.25f - _scale) * 2.5f; 
			setScale(_scale < 1.2f ? _scale : 1.2f, _scale < 1.2f ? _scale : 1.2f);
		}
		else
		{
			_scale = 1.2f;
			setScale(1.2f, 1.2f);
		}
	}
	else
	{
		if(_scale > 1.f)
		{
			_scale -= delta.asSeconds() * (1.25f - _scale) * 1.5f;
			setScale(_scale > 1.f ? _scale : 1.f, _scale > 1.f ? _scale : 1.f);
		}
		else
		{
			_scale = 1.f;
			setScale(1.f, 1.f);
		}
	}
}

void GuiTriangle::bind(const std::function<void()>& lambda)
{
	onClick = lambda;
}

void GuiTriangle::redraw()
{
	double degree = 3.14159265358 / 180.;
	_vertices[0].position = sf::Vector2f(0, -getSize()); 
	_vertices[1].position = sf::Vector2f(std::sin(165.f * degree) * getSize(), -std::cos(165.f * degree) * getSize());
	_vertices[2].position = sf::Vector2f(std::sin(195.f * degree) * getSize(), -std::cos(195.f * degree) * getSize());
}