////////////// OpenGL drawShape for 2D Functions ver 1 /////////////////
#include <GL/glut.h>
#include "drawShape2D.h"

void setColor(color_t col)
{
    glColor3f(col.r, col.g, col.b); 
}

void drawDot(point2D_t pt)
{
    glBegin(GL_POINTS);
        glVertex2f(pt.x, pt.y);
    glEnd();
}

void drawLine(point2D_t p1,point2D_t p2)
{
    glBegin(GL_LINES);
        glVertex2f(p1.x, p1.y);
        glVertex2f(p2.x, p2.y);
    glEnd();
}

void drawLine(float x1,float y1,float x2,float y2)
{
    glBegin(GL_LINES);
        glVertex2f(x1, y1);
        glVertex2f(x2, y2);
    glEnd();
}

//n: number of points
void drawPolyline(point2D_t pnt[],int n)
{
    int i;
    glBegin(GL_LINE_STRIP);
        for (i=0;i<n;i++) {
            glVertex2f(pnt[i].x, pnt[i].y);
        }
    glEnd();
}

//n: number of vertices
void drawPolygon(point2D_t pnt[],int n)
{
    int i;
    glBegin(GL_LINE_LOOP);
        for (i=0;i<n;i++) {
            glVertex2f(pnt[i].x, pnt[i].y);
        }
    glEnd();
}

// The function fillPolygon can fills only convex polygons
//n: number of vertices
void fillPolygon(point2D_t pnt[],int n,color_t color)
{
    int i;
    setColor(color);
    glBegin(GL_POLYGON);
        for (i=0;i<n;i++) {
            glVertex2f(pnt[i].x, pnt[i].y);
        }
    glEnd();
}

// The function gradatePolygon can fills only convex polygons
// The vertices will be painted with corresponding given colors.
// The points inside the polygon will be painted with the mixed color.
//n: number of vertices
void gradatePolygon(point2D_t pnt[],color_t col[],int num)
{
    int i;
    glBegin(GL_POLYGON);
        for (i=0;i<num;i++) {
            setColor(col[i]);
            glVertex2f(pnt[i].x, pnt[i].y);
        }
    glEnd();
}