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#include "graphics.h"
#include <cmath>
#include <vector>
#include <cstdlib>
#include <ctime>
struct Vec3 {
float x, y, z;
};
Vec3 operator+(const Vec3& a, const Vec3& b) { return {a.x+b.x,a.y+b.y,a.z+b.z}; }
Vec3 operator-(const Vec3& a, const Vec3& b) { return {a.x-b.x,a.y-b.y,a.z-b.z}; }
Vec3 operator*(const Vec3& a, float s) { return {a.x*s,a.y*s,a.z*s}; }
float length(const Vec3& v) {
return std::sqrt(v.x*v.x + v.y*v.y + v.z*v.z);
}
Vec3 normalize(const Vec3& v) {
float l = length(v);
if (l == 0) return {0,0,0};
return {v.x/l, v.y/l, v.z/l};
}
Vec3 rotateX(const Vec3& v, float a) {
float c = std::cos(a), s = std::sin(a);
return { v.x, v.y*c - v.z*s, v.y*s + v.z*c };
}
Vec3 rotateY(const Vec3& v, float a) {
float c = std::cos(a), s = std::sin(a);
return { v.x*c + v.z*s, v.y, -v.x*s + v.z*c };
}
// Camera
struct Camera {
Vec3 position;
float yaw;
float pitch;
};
void project(const Vec3& v, int& x2d, int& y2d,
int width, int height, float fov)
{
if (v.z <= 0.1f) return;
float factor = fov / v.z;
x2d = static_cast<int>(v.x * factor + width/2);
y2d = static_cast<int>(v.y * factor + height/2);
}
struct Star {
Vec3 pos;
};
struct Cube {
Vec3 pos;
float size;
};
struct Planet {
Vec3 pos;
float radius;
};
int main() {
std::srand(static_cast<unsigned>(std::time(nullptr)));
const int width = 1280;
const int height = 720;
WindowHandle* window = createWindow("SAMPLE4 - SPACE NAVIGATION", width, height);
if (!window) return -1;
setMouseLocked(window, true);
Camera cam;
cam.position = {0,0,-5};
cam.yaw = 0;
cam.pitch = 0;
const float moveSpeed = 0.3f;
const float mouseSensitivity = 0.002f;
// ----- STARFIELD -----
const int starCount = 1500;
std::vector<Star> stars;
for (int i = 0; i < starCount; ++i) {
stars.push_back({
{
(rand()%2000 - 1000) / 10.0f,
(rand()%2000 - 1000) / 10.0f,
(rand()%2000 - 1000) / 10.0f
}
});
}
// ----- CUBES -----
std::vector<Vec3> cubeVertices = {
{-1,-1,-1},{1,-1,-1},{1,1,-1},{-1,1,-1},
{-1,-1,1},{1,-1,1},{1,1,1},{-1,1,1}
};
std::vector<std::pair<int,int>> cubeEdges = {
{0,1},{1,2},{2,3},{3,0},
{4,5},{5,6},{6,7},{7,4},
{0,4},{1,5},{2,6},{3,7}
};
std::vector<Cube> cubes;
for (int i = 0; i < 40; ++i) {
cubes.push_back({
{
(rand()%2000 - 1000) / 10.0f,
(rand()%2000 - 1000) / 10.0f,
(rand()%2000 - 1000) / 10.0f
},
(rand()%50)/10.0f + 1.0f
});
}
// ----- PLANETS -----
std::vector<Planet> planets;
for (int i = 0; i < 5; ++i) {
planets.push_back({
{
(rand()%3000 - 1500) / 10.0f,
(rand()%3000 - 1500) / 10.0f,
(rand()%3000 - 1500) / 10.0f
},
(rand()%200)/10.0f + 5.0f
});
}
while (!windowShouldClose(window)) {
pollEvents(window);
// ----- MOUSE LOOK -----
int dx, dy;
getMouseDelta(window, dx, dy);
cam.yaw += dx * mouseSensitivity;
cam.pitch += dy * mouseSensitivity;
if (cam.pitch > 1.5f) cam.pitch = 1.5f;
if (cam.pitch < -1.5f) cam.pitch = -1.5f;
// Forward vector
Vec3 forward = {
std::sin(cam.yaw),
0,
std::cos(cam.yaw)
};
Vec3 right = {
std::cos(cam.yaw),
0,
-std::sin(cam.yaw)
};
// ----- MOVEMENT -----
if (keyDown(window, KEY_UP))
cam.position = cam.position + forward * moveSpeed;
if (keyDown(window, KEY_DOWN))
cam.position = cam.position - forward * moveSpeed;
if (keyDown(window, KEY_LEFT))
cam.position = cam.position - right * moveSpeed;
if (keyDown(window, KEY_RIGHT))
cam.position = cam.position + right * moveSpeed;
clearScreen(window, Color(0,0,10));
float fov = 500.0f;
// ----- DRAW STARS -----
for (auto& star : stars) {
Vec3 p = star.pos - cam.position;
p = rotateY(p, -cam.yaw);
p = rotateX(p, -cam.pitch);
if (p.z > 0) {
int sx, sy;
project(p, sx, sy, width, height, fov);
if (sx>=0 && sx<width && sy>=0 && sy<height)
drawPixel(window, sx, sy, Color(255,255,255));
}
}
// ----- DRAW CUBES -----
for (auto& cube : cubes) {
std::vector<Vec3> transformed;
for (auto v : cubeVertices) {
v = v * cube.size;
v = v + cube.pos;
v = v - cam.position;
v = rotateY(v, -cam.yaw);
v = rotateX(v, -cam.pitch);
transformed.push_back(v);
}
for (auto& e : cubeEdges) {
if (transformed[e.first].z > 0 &&
transformed[e.second].z > 0) {
int x1,y1,x2,y2;
project(transformed[e.first], x1,y1,width,height,fov);
project(transformed[e.second],x2,y2,width,height,fov);
drawLine(window,x1,y1,x2,y2,Color(0,255,200));
}
}
}
// ----- DRAW PLANETS (wireframe sphere imitation) -----
for (auto& planet : planets) {
Vec3 p = planet.pos - cam.position;
p = rotateY(p, -cam.yaw);
p = rotateX(p, -cam.pitch);
if (p.z <= 0) continue;
int cx, cy;
project(p, cx, cy, width, height, fov);
float scale = fov / p.z;
int radius2D = static_cast<int>(planet.radius * scale);
drawCircle(window, cx, cy, radius2D, Color(100,100,255));
}
swapBuffers(window);
delay(16);
}
destroyWindow(window);
return 0;
}
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