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--- wiki2:graphics [2015/10/08 15:42]
alfred creado
+++ wiki2:graphics [2020/05/09 09:25] (actual)
@@ Línea 4: / Línea 4: @@
   * {{: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>

Programming