add neopixel example

lib/NeoPattern/NeoPatternState.cpp

@@ -0,0 +1,58 @@
+#ifndef __NEOPATTERN_STATE__
+#define __NEOPATTERN_STATE__
+
+#include <ArduinoJson.h>
+#include "NeoPattern_api_json.h"
+#include "NeoPattern_api_modes.cpp"
+#include "utils_print.h"
+
+// TODO move ARRAY_LENGTH to core lib
+#define ARRAY_LENGTH(array) sizeof(array)/sizeof(array[0])
+
+struct NeoPatternState {
+    uint mode;
+    uint value;
+    const char* valueStr;
+    // ------------------------------------------------------------------------------------------
+    //Check if given object is valid and contains fields: JSON_MODE_NODE, JSON_VALUE
+    int verifyJsonObject(JsonObject& json){
+        return json.success() 
+            && json.containsKey(JSON_MODE_NODE)
+            && json.containsKey(JSON_VALUE);
+    };
+    JsonObject& toJsonObject() {
+        StaticJsonBuffer<200> jsonBuffer;
+        JsonObject& root = jsonBuffer.createObject();
+        root["mode"] = mode;
+        root["value"] = value;
+        return root;
+    }
+    String toJsonString(){
+        StaticJsonBuffer<200> jsonBuffer;
+        JsonObject& root = jsonBuffer.createObject();
+        root["mode"] = mode;
+        root["value"] = value;
+        String jsonString;
+        root.printTo(jsonString);
+        return jsonString;
+    }
+    // Map a json object to this struct.
+    void fromJsonObject(JsonObject& json){
+        if(!verifyJsonObject(json)){
+            PRINT_MSG(Serial, "PatternState.fromJsonObject", "cannot parse JSON");
+            return;
+        }
+        mode = atoi(json[JSON_MODE_NODE]);
+        mode = mode < ARRAY_LENGTH(PIXEL_FNCS) ? mode : 0;
+        value = json[JSON_VALUE];
+        valueStr = json[JSON_VALUE];
+    };
+    // Parse a json string and map parsed object
+    void fromJsonString(String& str){
+        StaticJsonBuffer<200> jsonBuffer;
+        JsonObject& json = jsonBuffer.parseObject(str);
+        fromJsonObject(json);
+    };
+};
+
+#endif