point.cpp

/**
 * PGR 2013 project
 * Implements 2D point in float
 *
 * @author  xskota05 Klara Vankova
 *          xsimet00 Vojtech Simetka
 * @date    2013/11/26
 * @version 1
 * @file    point.cpp
 */
#include "point.h"
#include "openglwidget.h"

/**
 * @brief Point constructor
 * @param x Coordinate x
 * @param y Coordinate y
 */
Point::Point(float x, float y)
{
    this->x = x;
    this->y = y;
}

/**
 * @brief Returns coordinate x
 * @return Coordinate x
 */
float Point::getX() const
{
    return x;
}

/**
 * @brief Sets coordinate x to new value
 * @param x New x coordinate
 */
void Point::setX(float x)
{
    this->x = x;
}

/**
 * @brief Returns coodinate y
 * @return Coordinate y
 */
float Point::getY() const
{
    return y;
}

/**
 * @brief Sets coodinate y to new value
 * @param y New y coordinate
 */
void Point::setY(float y)
{
    this->y = y;
}

/**
 * @brief Sets point's new location
 * @param x New x coordinate
 * @param y New y coordinate
 */
void Point::setLocation(float x, float y)
{
    this->x = x;
    this->y = y;
}

/**
 * @brief Paints point p
 * @param p Point to be painted
 */
void Point::paintPoint(Point p)
{
    Point::paintPoint(p.getX(), p.getY());
}

/**
 * @brief Paints point with coordinates x and y
 * @param x Coordinate x of painted point
 * @param y Coordinate y of painted point
 */
void Point::paintPoint(float x, float y)
{
    // Enables and sets blending
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    // Sets size
    glPointSize(MINDISTANCE);

    // Sets color
    glColor4f(0.5, 0.75, 0.95, 0.8);

    // Draws primitive
    glBegin(GL_POINTS);
    glVertex2f(x, y);
    glEnd();

    // Disables blending
    glDisable(GL_BLEND);
}

/**
 * @brief Paints point with coordinates x and y
 * @param x Coordinate x of painted point
 * @param y Coordinate y of painted point
 */
void Point::paintPoint(Point p, float x, float y)
{
    Point::paintPoint(p.getX(), p.getY(), x, y);
}

void Point::paintPoint(float px, float py, float x, float y)
{
    // Enables and sets blending
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    if (isNearby(px, py, x, y))
    {
        // Sets size
        glPointSize(2*MINDISTANCE);

        // Sets color
        glColor4f(0.5, 0.75, 0.95, 1);
    }
    else
    {
        // Sets size
        glPointSize(MINDISTANCE);

        // Sets color
        glColor4f(0.5, 0.75, 0.95, 0.8);
    }

    // Draws primitive
    glBegin(GL_POINTS);
    glVertex2f(px, py);
    glEnd();

    // Disables blending
    glDisable(GL_BLEND);
}


float Point::distance(float x, float y) const
{
    float dx = x - this->x;
    float dy = y - this->y;
    return sqrt((dx*dx) + (dy*dy));
}

float Point::distance(float x1, float y1, float x2, float y2)
{
    float dx = x1 - x2;
    float dy = y1 - y2;
    return sqrt((dx*dx) + (dy*dy));
}

bool Point::isNearby(float x, float y)
{
    return Point::distance(this->x, this->y, x, y) < OpenGLWidget::treshold_value;
}

bool Point::isNearby(float x1, float y1, float x2, float y2)
{
    return Point::distance(x1, y1, x2, y2) < OpenGLWidget::treshold_value;
}