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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#ifdef WIN32
#include <windows.h>
#include <conio.h>
#endif
#define WIDTH 96
#define HEIGHT 48
#define FPS 30.f
#define GRAVITY 2.0f
#define DECELERATION 0.65f
#define MARGIN 0.05f
typedef enum PIXEL{
MPTY,
FULL
} PIXEL;
static PIXEL display[WIDTH*HEIGHT];
static char pixels[4] = " .'O";
typedef struct v2{
float x;
float y;
} v2;
typedef struct ball{
v2 center;
float radius;
} ball;
void clear(){
#ifdef WIN32
system("cls");
#else
system("clear");
#endif
}
void move(int x, int y){
#ifdef _WIN32
COORD coord = {.X = x, .Y = y};
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
#else
printf("\033[%d;%dH", y, x);
#endif
}
void hide(int o){
#ifndef WIN32
if(o)
printf("\e[?25h");
else
printf("\e[?251");
#endif
}
void back(){
move(0, 0);
}
void csleep(int milliseconds){
#ifdef _WIN32
Sleep(milliseconds);
#else
float fmilliseconds = milliseconds/1000;
sleep(fmilliseconds);
#endif
}
void clearDisplay(){
for(int y = 0; y < HEIGHT; ++y){
for(int x = 0; x < WIDTH; ++x){
display[x + y*WIDTH] = MPTY;
}
}
}
v2 initV2(float x, float y){
v2 newV2;
newV2.x = x;
newV2.y = y;
return newV2;
}
ball initBall(float x, float y, float radius){
ball newBall;
newBall.center = initV2(x, y);
newBall.radius = radius;
return newBall;
}
void drawBall(ball b){
clearDisplay();
v2 min = initV2(floor(b.center.x-b.radius), floor(b.center.y-b.radius));
v2 max = initV2(ceil(b.center.x+b.radius), ceil(b.center.y+b.radius));
for(int y = min.y; y < max.y; ++y){
for(int x = min.x; x < max.x; ++x){
float px = b.center.x - x - 0.5f, py = b.center.y - y - 0.5f;
if((px*px + py*py) <= b.radius*b.radius){
if(x >= 0 && x <= WIDTH && y >= 0 && y <= HEIGHT){
display[x + y*WIDTH] = FULL;
}
}
}
}
}
void drawDisplay(){
char row[WIDTH];
for(int y = 0; y < HEIGHT/2; ++y){
for(int x = 0; x < WIDTH; ++x){
PIXEL t = display[x + (2*y+0)*WIDTH];
PIXEL b = display[x + (2*y+1)*WIDTH];
row[x] = (pixels[b + t*2]);
}
fwrite(row, sizeof(char), WIDTH, stdout);
putchar('\n');
}
}
int main(){
clear();
clearDisplay();
back();
hide(1);
ball b = initBall(10, 10, 8);
v2 vel = initV2(3, 0.1);
while(vel.y != 0 || vel.x != 0){
if(vel.x < MARGIN && vel.x > -MARGIN)
vel.x = 0;
if(vel.y < MARGIN && vel.y > -MARGIN)
vel.y = 0;
vel.y += (GRAVITY/FPS)*(b.center.y+b.radius-HEIGHT < 0);
b.center.x += vel.x;
b.center.y += vel.y;
if(b.center.x+b.radius > WIDTH || b.center.x+b.radius+MARGIN > WIDTH){
b.center.x = WIDTH - b.radius;
vel.x *= -DECELERATION;;
}
if(b.center.x-b.radius < 0 || b.center.x-b.radius-MARGIN < 0){
b.center.x = b.radius;
vel.x *= -DECELERATION;
}
if(b.center.y+b.radius > HEIGHT || b.center.y+b.radius+MARGIN > HEIGHT){
b.center.y = HEIGHT - b.radius;
vel.y *= -DECELERATION;
vel.x *= 1.5*DECELERATION;
}
back();
drawBall(b);
drawDisplay();
csleep(1000/FPS);
}
return 0;
}
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