rotagon/polygons.c

/*
** polygons.c - <+DESC+>
**
** 2014 - Frank Villaro-Dixon <Frank@Villaro-Dixon.eu>
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "game.h"
#include "polygons.h"
#include "obs.h"
#include "SDL_prims.h"
#include "SDL/SDL.h"




SDL_Point
get_hexagon_vertice(int faceno, int dist) { //{{{
	SDL_Point p1;

	p1.x = dist * cos((M_PI/3)*faceno);
	p1.y = dist * sin((M_PI/3)*faceno);

	OFFSET_POINT(p1);

	return p1;
} //}}}
SDL_Point
get_square_vertice(int faceno, int dist) { //{{{
	SDL_Point p1;

	p1.x = dist * cos((M_PI/2)*faceno);
	p1.y = dist * sin((M_PI/2)*faceno);

	OFFSET_POINT(p1);

	return p1;
} //}}}
SDL_Point
get_triangle_vertice(int faceno, int dist) { //{{{
	SDL_Point p1;

	p1.x = dist * cos((2*M_PI/3)*faceno);
	p1.y = dist * sin((2*M_PI/3)*faceno);

	OFFSET_POINT(p1);

	return p1;
} //}}}

void
draw_polygon_side(struct s_game *g, int faceno, int dist, int thick, int col) { //{{{

	SDL_Point (*get_poly_vertice)(int faceno, int dist);
	SDL_Point p1, p2, p3, p4;

	/* Depending on the polygon */
	switch(g->polygon_type) {
	case SHAPE_HEXAGON:
		get_poly_vertice = get_hexagon_vertice;
		break;
	case SHAPE_SQUARE:
		get_poly_vertice = get_square_vertice;
		break;
	case SHAPE_TRIANGLE:
		get_poly_vertice = get_triangle_vertice;
		break;
	default:
		fprintf(stderr, "Unknown SHAPE @ %s", __FILE__);
		exit(EXIT_FAILURE);
	}


	p1 = get_poly_vertice(faceno, dist);
	p2 = get_poly_vertice(faceno+1, dist);
	p3 = get_poly_vertice(faceno+1, dist+thick);
	p4 = get_poly_vertice(faceno, dist+thick);

	SDL_Point points[4] = {to_screen_coords(g, p1),
	                       to_screen_coords(g, p2),
	                       to_screen_coords(g, p3),
	                       to_screen_coords(g, p4)} ;
	SDL_FillPolygon(g->screen, points, 4, col);
}//}}}

void
draw_polygon(struct s_game *g) { //{{{
	int faces;

	for(faces = 0; faces < SHAPE_HEXAGON; faces++) {
		draw_polygon_side(g, faces, 0, POLYGON_SIZE, 0);
	}


	for(faces = 0; faces < SHAPE_HEXAGON; faces++) {
		draw_polygon_side(g, faces, POLYGON_SIZE, POLYGON_THICK, g->color);
	}
} //}}}