Loading JSON Data
/**
* Loading JSON Data
* Translated to C++ Mode from Processing Java by Daniel Shiffman.
*/
struct Bubble {
float x, y, diameter;
std::string name;
bool over = false;
Bubble(float x, float y, float diameter, std::string name)
: x(x), y(y), diameter(diameter), name(name) {}
void rollover(float px, float py) {
over = dist(px, py, x, y) < diameter / 2;
}
void display() {
stroke(0);
strokeWeight(2);
noFill();
ellipse(x, y, diameter, diameter);
if (over) {
fill(0);
textAlign(CENTER);
text(name, x, y + diameter / 2 + 20);
}
}
};
std::vector<Bubble> bubbles;
JSONValue json;
void loadData() {
json = loadJSONObject("data/data.json");
if (!json.isObject() || !json.hasKey("bubbles")) {
println("Failed to load data.json");
return;
}
JSONArray& bubbleData = json["bubbles"].getArray();
bubbles.clear();
for (auto& b : bubbleData) {
if (!b.hasKey("position")) continue;
float x = b["position"]["x"].getFloat();
float y = b["position"]["y"].getFloat();
float diameter = b["diameter"].getFloat();
std::string label = b["label"].getString();
bubbles.push_back(Bubble(x, y, diameter, label));
}
println("Loaded " + std::to_string(bubbles.size()) + " bubbles");
}
void setup() {
size(640, 360);
loadData();
}
void draw() {
background(255);
for (auto& b : bubbles) {
b.display();
b.rollover(mouseX, mouseY);
}
textAlign(LEFT);
fill(0);
text("Click to add bubbles.", 10, height - 10);
}
void mousePressed() {
// Build position object
JSONObject pos;
pos["x"] = JSONValue((double)mouseX);
pos["y"] = JSONValue((double)mouseY);
// Build bubble object
JSONObject newBubble;
newBubble["position"] = JSONValue(pos);
newBubble["diameter"] = JSONValue((double)random(40, 80));
newBubble["label"] = JSONValue(std::string("New label"));
// Append to array
JSONArray& bubbleData = json["bubbles"].getArray();
bubbleData.push_back(JSONValue(newBubble));
if ((int)bubbleData.size() > 10) {
bubbleData.erase(bubbleData.begin());
}
saveJSONObject("data/data.json", json);
loadData();
}