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        void ofApp::setupAnim() {
    increment = 10;
    max = 400;
    pos = 0;
}

void ofApp::updateAnim(){
    pos += increment;
    if(pos > max * 2) {
        pos = 0;
        vertical = !vertical;
    }
}

void ofApp::drawAnim() {
    ofBackground(0, 0, 0);
    for(int i = 1; i <= max; i++) {
        if(vertical) drawVerticalLines(i);
        else drawHorizontalLines(i);
    }
}

void ofApp::drawVerticalLines(int x) {
    if(x % 2 == 0) {
        ofLine(x, pos - max, x, pos);
    } else {
        ofLine(x, height - pos, x, max * 2 - pos);
    }
}

void ofApp::drawHorizontalLines(int y) {
    if(y % 2 == 0) {
        ofLine(pos - max, y, pos, y);
    } else {
        ofLine(height - pos, y, max * 2 - pos, y);
    }
}