init

external/test_json.cpp

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+
+
+
+
+#include <iostream>
+#include <Eigen/Core>
+#include <Eigen/Dense>
+
+#include "json.hpp"
+#include "simpleppm.h"
+
+#include <sstream>
+
+using namespace std;
+using namespace nlohmann;
+
+
+
+bool test_parse_geometry(json& j){
+    cout<<"Geometry: "<<endl;
+    int gc = 0;
+    
+    // use iterators to read-in array types
+    for (auto itr = j["geometry"].begin(); itr!= j["geometry"].end(); itr++){
+        
+        std::string type;
+        if(itr->contains("type")){
+           // type = static_cast<std::string>((*itr)["type"]);
+            type = (*itr)["type"].get<std::string>();
+        } else {
+            cout<<"Fatal error: geometry shoudl always contain a type!!!"<<endl;
+            return false;
+        }
+        
+        if(type=="sphere"){
+            cout<<"Sphere: "<<endl;
+            Eigen::Vector3f centre(0,0,0);
+            int i = 0;
+            for (auto itr2 =(*itr)["centre"].begin(); itr2!= (*itr)["centre"].end(); itr2++){
+                if(i<3){
+                    centre[i++] = (*itr2).get<float>();
+                } else {
+                    cout<<"Warning: Too many entries in centre"<<endl;
+                }
+            }
+            cout<<"Centre: "<<centre<<endl;
+            
+        }
+        ++gc;
+    }
+    
+    cout<<"We have: "<<gc<<" objects!"<<endl;
+    return true;
+}
+
+bool test_parse_lights(json& j){
+    cout<<"Light: "<<endl;
+    int lc = 0;
+    
+    // use iterators to read-in array types
+    for (auto itr = j["light"].begin(); itr!= j["light"].end(); itr++){
+        
+        std::string type;
+        if(itr->contains("type")){
+          //  type = static_cast<std::string>((*itr)["type"]);
+            type = (*itr)["type"].get<std::string>();
+        } else {
+            cout<<"Fatal error: light shoudl always contain a type!!!"<<endl;
+            return false;
+        }
+        
+        if(type=="point"){
+            cout<<"Point based light: "<<endl;
+            Eigen::Vector3f centre(0,0,0);
+            int i = 0;
+            for (auto itr2 =(*itr)["centre"].begin(); itr2!= (*itr)["centre"].end(); itr2++){
+                if(i<3){
+                    centre[i++] = (*itr2).get<float>();
+                } else {
+                    cout<<"Warning: Too many entries in centre"<<endl;
+                }
+            }
+            cout<<"Centre: "<<centre<<endl;
+            
+        }
+        ++lc;
+    }
+    
+    cout<<"We have: "<<lc<<" objects!"<<endl;
+    
+    return true;
+}
+
+bool test_parse_output(json& j){
+    cout<<"Outputs: "<<endl;
+    int lc = 0;
+    
+    // use iterators to read-in array types
+    for (auto itr = j["output"].begin(); itr!= j["output"].end(); itr++){
+        
+        std::string filename;
+        if(itr->contains("filename")){
+          //  filename = static_cast<std::string>((*itr)["filename"]);
+            filename = (*itr)["filename"].get<std::string>();
+        } else {
+            cout<<"Fatal error: output shoudl always contain a filename!!!"<<endl;
+            return false;
+        }
+        
+        
+        int size[2];
+        int i = 0;
+        for (auto itr2 =(*itr)["size"].begin(); itr2!= (*itr)["size"].end(); itr2++){
+            if(i<2){
+                size[i++] = (*itr2).get<float>();
+            } else {
+                cout<<"Warning: Too many entries in size"<<endl;
+            }
+        }
+        
+        Eigen::Vector3f lookat(0,0,0), up(0,0,0), centre(0,0,0);
+        
+         i = 0;
+        for (auto itr2 =(*itr)["centre"].begin(); itr2!= (*itr)["centre"].end(); itr2++){
+            if(i<3){
+                centre[i++] = (*itr2).get<float>();
+            } else {
+                cout<<"Warning: Too many entries in centre"<<endl;
+            }
+        }
+        
+        // Similarly to the centre array you need to read the lookat and up
+        //Maybe create a separate functiomn to read arrays - ythey are pretty common
+        
+        
+        // I am retrieving the field of view
+        // this is mandatory field here, but if I dont check if it exists,
+        // the code will throw an exception which if not caught will end the execution of yoru program
+        cout<<"A"<<endl;
+        float fov = (*itr)["fov"].get<float>();
+        cout<<"B"<<endl;
+        
+        cout<<"Filename: "<<filename<<endl;
+        cout<<"Camera centre: "<<centre<<endl;
+        cout<<"FOV: "<<fov<<endl;
+        
+        ++lc;
+    }
+    
+    cout<<"We have: "<<lc<<" objects!"<<endl;
+    return true;
+}
+
+int test_json(json& j){
+    
+    
+    
+    // 1 - parse geometry
+    test_parse_geometry(j);
+    
+    // 2 - parse lights
+    test_parse_lights(j);
+    
+    // 3 - parse lights
+    test_parse_output(j);
+    
+    return 0;
+}
+