rotagon/game.c

/*
** game.c - The game
**
** 2014 - Frank Villaro-Dixon <Frank@Villaro-Dixon.eu>
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "game.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;
} //}}}
void
draw_hexagon_side(struct s_game *g, int faceno, int dist, int col) { //{{{
	SDL_Point p1, p2, p3, p4;

	p1 = get_hexagon_vertice(faceno, dist);
	p2 = get_hexagon_vertice(faceno+1, dist);
	p3 = get_hexagon_vertice(faceno+1, dist+SHAPE_THICK);
	p4 = get_hexagon_vertice(faceno, dist+SHAPE_THICK);

	SDL_Point points[4] = {p1, p2, p3, p4} ;
	SDL_FillPolygon(g->screen, points, 4, col);
}//}}}
void
draw_hexagon(struct s_game *g) { //{{{
	int faces;

#define DFT_COLOR 128
	for(faces = 0; faces < SHAPE_HEXAGON; faces++) {
		draw_hexagon_side(g, faces, 30, g->color);
	}
} //}}}


SDL_Point
get_circle_vertice(int angle, int dist)
{
	SDL_Point p;

	p.x = cos((double)angle*2*M_PI/ANGLE_MAX) * dist;
	p.y = sin((double)angle*2*M_PI/ANGLE_MAX) * dist;

	OFFSET_POINT(p);

	return p;
}
void
draw_cursor(struct s_game *g) {
	SDL_Point p1, p2, p3;

	p1 = get_circle_vertice(g->cursor_angle, CURSOR_DIST+10);
	p2 = get_circle_vertice(g->cursor_angle-TO_DEG(8), CURSOR_DIST);
	p3 = get_circle_vertice(g->cursor_angle+TO_DEG(8), CURSOR_DIST);

	SDL_Point pts[3] = {p1, p2, p3};

	SDL_FillPolygon(g->screen, pts, 3, g->color);
}

void
draw_game(struct s_game *g) {

	switch(g->polygon_type) {
	case SHAPE_HEXAGON:
		draw_hexagon(g);
		break;
	}

	draw_cursor(g);
}


void
get_keys(struct s_game *g) {
	SDL_PumpEvents();
	if(g->keys[SDL_QUIT])
		exit(0);
	if(g->keys[SDLK_q])
		exit(0);

	if(g->keys[SDLK_LEFT])
		g->cursor_angle -= TO_DEG(3);
	if(g->keys[SDLK_RIGHT])
		g->cursor_angle += TO_DEG(3);

	g->cursor_angle %= ANGLE_MAX;
}


void
init_game(struct s_game *g) { //{{{
	g->polygon_type = SHAPE_HEXAGON;
	g->cursor_angle = TO_DEG(90);
	g->color = 128;
	g->keys = SDL_GetKeyState(NULL);
} //}}}