ofApp::draw()の中でのwhile文

openFrameworksで、以下のようなサイン波を生成するコードを書きました。

C++
1//--------------------------------------------------------------
2void ofApp::setup(){
3    ofSetWindowShape(500, 500);
4    ofEnableSmoothing();
5    ofNoFill();
6    ofBackground(0, 0, 0);
7    ofSetFrameRate(60);
8}
9
10//--------------------------------------------------------------
11void ofApp::update(){
12
13}
14
15//--------------------------------------------------------------
16void ofApp::draw(){
17    ofBackground(0, 0, 0);
18    
19    
20    ofPath path = ofPath();
21    
22    path.setStrokeColor(ofColor(0, 0, 0));
23    path.setStrokeWidth(1);
24    
25    float angle = currentAngle;
26    float y = amplitude * sin(angle) + (ofGetWindowHeight()/2);
27    float x = 0.0;
28    
29    if (x <= ofGetWindowWidth()) {
30        angle += angleStep;
31        float nextX = x + xStep;
32        float nextY = amplitude * sin(angle) + (ofGetWindowHeight()/2);
33        path.moveTo(x, y);
34        path.lineTo(nextX, nextY);
35        
36        x = nextX;
37        y = nextY;
38        
39        path.draw();
40        path.close();
41
42     cout << "in while" << endl;
43    }
44    
45}
46
47void ofApp::updateCurrentAngle() {
48    currentAngle += angleSpeed;
49    if (currentAngle >= 2*PI) {
50        currentAngle -= 2*PI;
51    }
52}