1 files changed, 102 insertions, 0 deletions
diff --git a/examples/sample2.cpp b/examples/sample2.cpp
new file mode 100644
index 0000000..02e1718
--- /dev/null
+++ b/examples/sample2.cpp
@@ -0,0 +1,102 @@
+#include "graphics.h"
+#include <cmath>
+#include <vector>
+
+struct Vec3 {
+    float x, y, z;
+};
+
+// Rotate point around X axis
+Vec3 rotateX(const Vec3& v, float angle) {
+    float c = std::cos(angle);
+    float s = std::sin(angle);
+    return {
+        v.x,
+        v.y * c - v.z * s,
+        v.y * s + v.z * c
+    };
+}
+
+// Rotate point around Y axis
+Vec3 rotateY(const Vec3& v, float angle) {
+    float c = std::cos(angle);
+    float s = std::sin(angle);
+    return {
+        v.x * c + v.z * s,
+        v.y,
+        -v.x * s + v.z * c
+    };
+}
+
+// Perspective projection
+void project(const Vec3& v, int& x2d, int& y2d, float width, float height) {
+    float distance = 2.0f;        // camera distance
+    float scale = 100.0f;         // zoom factor
+
+    float z = v.z + distance;
+    float factor = scale / z;
+
+    x2d = static_cast<int>(v.x * factor + width / 2);
+    y2d = static_cast<int>(v.y * factor + height / 2);
+}
+
+int main() {
+    const int width = 640;
+    const int height = 480;
+
+    WindowHandle* window = createWindow("3D Spinning Cube", width, height);
+    if (!window) return -1;
+
+    // Cube vertices
+    std::vector<Vec3> vertices = {
+        {-1, -1, -1},
+        { 1, -1, -1},
+        { 1,  1, -1},
+        {-1,  1, -1},
+        {-1, -1,  1},
+        { 1, -1,  1},
+        { 1,  1,  1},
+        {-1,  1,  1}
+    };
+
+    // Cube edges (pairs of vertex indices)
+    std::vector<std::pair<int,int>> edges = {
+        {0,1},{1,2},{2,3},{3,0}, // back face
+        {4,5},{5,6},{6,7},{7,4}, // front face
+        {0,4},{1,5},{2,6},{3,7}  // connecting edges
+    };
+
+    float angle = 0.0f;
+
+    while (!windowShouldClose(window)) {
+        pollEvents(window);
+        clearScreen(window, Color(0, 0, 0)); // RGB 20, 20, 30
+
+        std::vector<Vec3> transformed;
+
+        // Rotate cube
+        for (const auto& v : vertices) {
+            Vec3 r = rotateX(v, angle);
+            r = rotateY(r, angle * 0.7f);
+            transformed.push_back(r);
+        }
+
+        // Draw edges
+        for (const auto& edge : edges) {
+            int x1, y1, x2, y2;
+
+            project(transformed[edge.first], x1, y1, width, height);
+            project(transformed[edge.second], x2, y2, width, height);
+
+            drawLine(window, x1, y1, x2, y2, Color(255, 255, 255)); // RGB 0 255 180
+        }
+
+        swapBuffers(window);
+
+        angle += 0.01f;
+        delay(16); // ~60 FPS
+    }
+
+    destroyWindow(window);
+    return 0;
+}