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gui_lib.c
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gui_lib.c
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/* Custom space-pong library's header file */
#include "pong_lib.h"
/* PBM765 allowed libraries */
#include <GL/gl.h>
#include <math.h>
/* Drawing quality */
#define CIRCLE_POLIGONS 69
/* Served game parameters pointed to main function processes */
char* l_team_name_ptr;
char* r_team_name_ptr;
int* l_team_score_ptr;
int* r_team_score_ptr;
int* grid_columns_ptr;
int* grid_rows_ptr;
double* paddle_width_ptr;
double* paddle_height_ptr;
double* ball_r_ptr;
double* ball_cx_ptr;
double* ball_cy_ptr;
double* ball_vx_ptr;
double* ball_vy_ptr;
double* r_paddle_cx_ptr;
double* r_paddle_cy_ptr;
double* l_paddle_cx_ptr;
double* l_paddle_cy_ptr;
/* For calculations */
double DOUBLE_PI = 2.0 * 3.142;
/* Initializes grid and pointers */
void initGrid(char* p_l_team_name, char* p_r_team_name, int* p_l_team_score, int* p_r_team_score,
int* p_grid_columns, int* p_grid_rows, double* p_paddle_width, double* p_paddle_height,
double* p_ball_r, double* p_ball_cx, double* p_ball_cy, double* p_ball_vx, double* p_ball_vy,
double* p_r_paddle_cx, double* p_r_paddle_cy, double* p_l_paddle_cx, double* p_l_paddle_cy){
l_team_name_ptr = p_l_team_name;
r_team_name_ptr = p_r_team_name;
l_team_score_ptr = p_l_team_score;
r_team_score_ptr = p_r_team_score;
grid_columns_ptr = p_grid_columns;
grid_rows_ptr = p_grid_rows;
paddle_width_ptr = p_paddle_width;
paddle_height_ptr = p_paddle_height;
ball_r_ptr = p_ball_r;
ball_cx_ptr = p_ball_cx;
ball_cy_ptr = p_ball_cy;
ball_vx_ptr = p_ball_vx;
ball_vy_ptr = p_ball_vy;
r_paddle_cx_ptr = p_r_paddle_cx;
r_paddle_cy_ptr = p_r_paddle_cy;
l_paddle_cx_ptr = p_l_paddle_cx;
l_paddle_cy_ptr = p_l_paddle_cy;
}
void unit(int x, int y){
glLineWidth(1.0);
glColor3f(0.478, 0.015, 0.921);
glBegin(GL_LINE_LOOP);
glVertex2f(x, y);
glVertex2f(x+1, y);
glVertex2f(x+1, y+1);
glVertex2f(x, y+1);
glEnd();
}
void drawGrid(){
int x, y;
for (x = 0; x < *grid_columns_ptr; x++){
for (y = 0; y < *grid_rows_ptr; y++){
unit(x, y);
}
}
glColor3f(1, 0, 0.627);
/* Draws upper border */
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0, *grid_rows_ptr - *ball_r_ptr);
glVertex2f(*grid_columns_ptr, *grid_rows_ptr - *ball_r_ptr);
glVertex2f(*grid_columns_ptr, *grid_rows_ptr);
glVertex2f(0, *grid_rows_ptr);
glEnd();
/* Draws lower border */
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0, 0);
glVertex2f(*grid_columns_ptr, 0);
glVertex2f(*grid_columns_ptr, *ball_r_ptr);
glVertex2f(0, *ball_r_ptr);
glEnd();
}
void drawText() {
/* TODO */
}
void drawPaddles(){
glLineWidth(1.0);
glColor3f(0.996, 0.458, 0.996);
/* Right paddle */
glRectd(*r_paddle_cx_ptr - *paddle_width_ptr/2, *r_paddle_cy_ptr - *paddle_height_ptr/2,
*r_paddle_cx_ptr + *paddle_width_ptr/2, *r_paddle_cy_ptr + *paddle_height_ptr/2);
/* Left paddle */
glRectd(*l_paddle_cx_ptr - *paddle_width_ptr/2, *l_paddle_cy_ptr - *paddle_height_ptr/2,
*l_paddle_cx_ptr + *paddle_width_ptr/2, *l_paddle_cy_ptr + *paddle_height_ptr/2);
}
void drawBall(){
int i;
/* Makes a ball move */
move_ball(ball_cx_ptr, ball_cy_ptr, ball_vx_ptr, ball_vy_ptr, l_team_score_ptr, r_team_score_ptr,
r_paddle_cx_ptr, r_paddle_cy_ptr, l_paddle_cx_ptr, l_paddle_cy_ptr);
/* Draws a ball moved */
glColor3f(1, 0.070, 0.309);
glBegin(GL_TRIANGLE_FAN);
/* From the center of the circle, and around */
glVertex2f(*ball_cx_ptr, *ball_cy_ptr); /* center of circle */
for (i = 0; i <= CIRCLE_POLIGONS; i++){
glVertex2f ((*ball_cx_ptr + (*ball_r_ptr * cos(i * DOUBLE_PI / 20))),
(*ball_cy_ptr + (*ball_r_ptr * sin(i * DOUBLE_PI / 20))));
}
glEnd();
}
void drawBorders(){
glColor3f(1, 0, 0.627);
glRectd(0, 0 , *grid_columns_ptr, *ball_r_ptr);
glRectd(0, *grid_rows_ptr - *ball_r_ptr, *grid_columns_ptr, *grid_rows_ptr);
glEnd();
}
void drawGame(){
drawGrid();
drawBorders();
drawBall();
drawPaddles();
drawText();
}