#include "PieChart.h"
#include <Windows.h>
#include <gl/GL.h>
#include <math.h>

PieChart::PieChart()
{

}

PieChart::~PieChart()
{

}

void PieChart::Render()
{
    glEnable(GL_BLEND);
    glEnable(GL_POLYGON_SMOOTH);
    glShadeModel(GL_FLAT);
    glBegin(GL_TRIANGLE_FAN);

    //center of fan
    glVertex2f(0.0f, 0.0f);

    for (angle = 0.0f; angle <= (25.0f * GL_PI); angle += (GL_PI / 30.0f))
    {
        //calculate x and y position of the next vertex
        y = 300.0f*sin(angle);
        x = 300.0f*cos(angle);

        //alternate colours
        if (pivot)
        {
            pivot = false;
            glColor3f(1.0f, .0f, 0.0f);
        }
        else
        {
            pivot = true;
            glColor3f(0.0f, 0.0f, 1.0f);
        }

        //specify the next vertex
        glVertex2f(x, y);
    }

    glEnd();
}

bool PieChart::MouseMove(int x, int y)
{
    return true;
}

bool PieChart::MouseLBUp(int x, int y)
{
    return true;
}
bool PieChart::MouseLBDown(int x, int y)
{
    return true;
}