Loading Tabular Data
/**
* Loading Tabular Data
* Translated to C++ Mode from Processing Java by Daniel Shiffman.
*
* Loads bubble data from a CSV file and allows adding
* new bubbles by clicking.
*
* CSV format (data/data.csv):
* x,y,diameter,name
* 160,103,43.19838,Happy
* 372,137,52.42526,Sad
* 273,235,61.14072,Joyous
* 121,179,44.758068,Melancholy
*/
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;
Table* table = nullptr;
void loadData() {
table = loadTable("data/data.csv", "header");
if (!table) {
println("Failed to load data.csv");
return;
}
bubbles.clear();
for (int i = 0; i < table->getRowCount(); i++) {
float x = table->getFloat(i, "x");
float y = table->getFloat(i, "y");
float diameter = table->getFloat(i, "diameter");
std::string name = table->getString(i, "name");
bubbles.push_back(Bubble(x, y, diameter, name));
}
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() {
if (!table) return;
// Add a new row
std::vector<std::string>& row = table->addRow();
TableRow tr(row, table->columns);
tr.setFloat(table->getColumnIndex("x"), mouseX);
tr.setFloat(table->getColumnIndex("y"), mouseY);
tr.setFloat(table->getColumnIndex("diameter"), random(40, 80));
tr.setString(table->getColumnIndex("name"), "Blah");
// Cap at 10 rows
if (table->getRowCount() > 10) {
table->removeRow(0);
}
saveTable("data/data.csv", *table);
loadData();
}