finish parse scene

src/Parser.cc

@@ -1,6 +1,45 @@
 #include "Parser.h"
+
+#include <Eigen/Core>
 #include <string>
 
-static Scene *parseScene(const nlohmann::json &j) {
+using Eigen::Vector3f;
-  string name = j["filename"].get<string>();
+using Eigen::VectorXi;
+using std::string;
+
+// a helper function to get Vector3f
+const Vector3f getVector3f(const nlohmann::json &j) {
+  return Vector3f(j[0].get<float>(), j[1].get<float>(), j[2].get<float>());
+}
+
+// A helper function to get raysperpixel array
+const VectorXi getRpp(const nlohmann::json &j) {
+  VectorXi rpp(j.size());
+
+  for (int i = 0; i < j.size(); ++i) {
+    rpp[i] = j[i].get<int>();
+  }
+
+  return rpp;
+}
+
+Scene *Parser::getScene(const nlohmann::json &j) {
+  string name = j["filename"].get<string>();
+  int width = j["size"][0].get<int>();
+  int height = j["size"][1].get<int>();
+  float fov = j["fov"].get<float>();
+  Vector3f lookAt = getVector3f(j["lookat"]);
+  Vector3f up = getVector3f(j["up"]);
+  Vector3f center = getVector3f(j["center"]);
+  Vector3f ai = getVector3f(j["ai"]);
+  Vector3f bgc = getVector3f(j["bkc"]);
+
+  Scene *sc = new Scene(name, width, height, fov, center, up, lookAt, ai, bgc);
+  sc->setAntialiasing(j.value("antialiasing", false));
+  sc->setTwoSideRender(j.value("twosiderender", false));
+  sc->setGlobalIllum(j.value("globalillum", false));
+  if (j.contains("raysperpixel"))
+    sc->setRaysPerPixel(getRpp(j["raysperpixel"]));
+
+  return sc;
 }