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#include <iostream>
#include <math.h>
const int mapSize = 7;
const float wallHeight = 1;
char map[mapSize][mapSize] = {
{ '0', '9', '8', '7', 'M', 'P', 'O' }, // 0
{ '-', ' ', ' ', ' ', ' ', ' ', '3' }, // 1
{ '=', ' ', ' ', ' ', 'o', ' ', '2' }, // 2
{ '|', ' ', ' ', ' ', ' ', ' ', '1' }, // 3
{ '=', ' ', ' ', ' ', ' ', ' ', '2' }, // 4
{ '-', ' ', ' ', '0', ' ', ' ', '3' }, // 5
{ '0', '9', '8', '7', '6', '5', '0' }, // 6
// 0 1 2 3 4 5 6
};
struct Coord {
float x;
float y;
};
float dist(Coord c1, Coord c2) {
float x1 = c2.x - c1.x, y1 = c2.y - c1.y;
return sqrt(x1 * x1 + y1*y1);
}
bool isValidCoord(float coord) {
return 0 <= coord && coord <= mapSize;
}
bool isValidCoord(Coord c) {
return isValidCoord(c.x) && isValidCoord(c.y);
}
const float focalLength = 3.4;
class Player {
Coord loc;
float lookingAngle = 0.0;
float height = 0.6;
int fov = 90;
public:
Player() : Player(0, 0) {}
Player(float x, float y) {
this->loc = { x, y };
}
float get_height() const {
return height;
}
const Coord& get_loc() const {
return loc;
}
int get_fov() const {
return fov;
}
float get_lookingAngle() const {
return lookingAngle;
}
void walkForward() {
if (isValidCoord(loc.x + 0.25))
loc.x += 0.25;
}
void walkBackward() {
if (isValidCoord(loc.x - 0.25))
loc.x -= 0.25;
}
void walkLeft() {
if (isValidCoord(loc.y - 0.25))
loc.y -= 0.25;
}
void walkRight() {
if (isValidCoord(loc.y + 0.25))
loc.y += 0.25;
}
void lookLeft() {
if (lookingAngle == -180)
lookingAngle = 180;
else
lookingAngle -= 2;
}
void lookRight() {
if (lookingAngle == 180)
lookingAngle = -180;
else
lookingAngle += 2;
}
Coord castRayFromEyes() const {
return castRayFromEyes(0);
}
Coord castRayFromEyes(float angle) const {
Coord rayLoc = loc;
angle += lookingAngle;
float xOffset = cos(angle * M_PI / 180.0), yOffset = sin(angle * M_PI / 180.0);
while (rayLoc.x < mapSize && rayLoc.y < mapSize && rayLoc.x > -1 && rayLoc.y > -1 && map[(int)rayLoc.y][(int)rayLoc.x] == ' ') {
rayLoc.x += 0.25 * xOffset;
rayLoc.y += 0.25 * yOffset;
}
std::cout << rayLoc.x << " " << rayLoc.y << std::endl;
return rayLoc;
}
};
const int scrH = 200, scrW = 800;
// const int scrH = 20, scrW = 80;
struct VerticalSlice {
Coord collision;
float collisionDistance;
int aboveRay;
int belowRay;
VerticalSlice() = default;
VerticalSlice(float topScr, float botScr, float plHeight, float angle, Coord plLoc, Coord objLoc) {
collision = objLoc;
float aboveHeight = wallHeight - plHeight;
float belowHeight = plHeight;
float properFL = focalLength;
this->collisionDistance = dist(plLoc, objLoc);
this->aboveRay = ((aboveHeight * properFL) / collisionDistance) * topScr;
this->belowRay = ((belowHeight * properFL) / collisionDistance) * botScr;
}
};
char getDepthChar(float distance) {
if (distance >= 6) return ' ';
else if (distance >= 5) return '.';
else if (distance >= 4) return ';';
else if (distance >= 3) return '+';
else if (distance >= 2) return '*';
else if (distance >= 1) return '#';
else return 'O';
}
void draw(Player& pl) {
float topScr = scrH * (wallHeight - pl.get_height()), botScr = scrH - topScr;
VerticalSlice slices[pl.get_fov()];
int halfFov = pl.get_fov() / 2;
for (int i = -halfFov; i <= halfFov; i++) {
slices[i + halfFov] = VerticalSlice(topScr, botScr, pl.get_height(), i, pl.get_loc(), pl.castRayFromEyes(i));
}
// return;
float angleStep = pl.get_fov() / (float)scrW;
for (int row = 0; row < scrH; row++) {
for (int dot = 0; dot < scrW; dot++) {
VerticalSlice sl = slices[(int)(dot * angleStep)];
if (row < topScr && topScr - row <= sl.aboveRay)
std::cout << getDepthChar(sl.collisionDistance);
else if (row >= topScr && row - topScr < sl.belowRay)
std::cout << getDepthChar(sl.collisionDistance);
else
std::cout << ' ';
}
std::cout << std::endl;
}
}
int main() {
Player pl(1, 3);
char buffer;
bool play = true;
system("stty -echo");
system("stty cbreak");
while (play) {
std::cout << u8"\033[2J\033[1;1H"; // clear
draw(pl);
buffer = getchar();
switch (buffer) {
case 'w': pl.walkForward(); break;
case 's': pl.walkBackward(); break;
case 'a': pl.walkLeft(); break;
case 'd': pl.walkRight(); break;
case ',': pl.lookLeft(); break;
case '.': pl.lookRight(); break;
case 'x': play = false; break;
}
for (int i = 0; i < 1000;i++){}
}
system("stty echo");
system("stty -cbreak");
}
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