====== Graphics ======

===== Bezier curves =====

  * {{:wiki2:graphics:decasteljau_algorithm.pdf|}}

===== Snippets =====
==== Draw sinus ====
In openframeworks:
<code cpp>
path.clear();

auto dx = (TWO_PI / 500.0) * 16;
float x = ofGetElapsedTimef();
auto space = 50.0, amplitud = 78.0;

auto y = sin(x) * amplitud;
x+=dx;
path.moveTo(0, ofGetHeight() / 2 + y);

for (int i = 1; i < 25; i++) {
	y = sin(x) * amplitud;
	x+=dx;
	path.curveTo(i * space, ofGetHeight() / 2 + y);
}
</code>

==== Draw circle ====
<code cpp>
auto angle = .0;
auto x = 0, y = 0;
auto radio = 300;
while (angle < 360) {
        // calculate x, y from a vector with known length and angle
        x = radio * cos (angle * DEG_TO_RAD);
        y = radio * sin (angle * DEG_TO_RAD);
        ofCircle(x + ofGetWidth() / 2, y + ofGetHeight() / 2, 3);
        angle += 10;
}
</code>
==== Rotate figure when its center is 0,0 ====
<code cpp>
vector<ofPoint> points = {
	ofPoint(x-50, y-50),
	ofPoint(x+50, y-50),
	ofPoint(x+50, y+50),
	ofPoint(x-50, y+50),
	ofPoint(x-50, y-50)
};
ofSetLineWidth(3);
ofNoFill();
ofBeginShape();
for (auto& vertex : points) {
	x = vertex.x*cos(angle * DEG_TO_RAD) - vertex.y*sin(angle * DEG_TO_RAD);
	y = vertex.y*cos(angle * DEG_TO_RAD) + vertex.x*sin(angle * DEG_TO_RAD);
	x += 250;
	y += 250;
	ofVertex(x, y);
}
ofEndShape();
</code>