Diferencias

Muestra las diferencias entre dos versiones de la página.

--- wiki2:graphics [2015/10/14 07:35]
alfred [Draw circle]
+++ wiki2:graphics [2020/05/09 09:25] (actual)
@@ Línea 30: / Línea 30: @@
 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 = 300 * cos (angle * DEG_TO_RAD);
+        x = radio * cos (angle * DEG_TO_RAD);
-        y = 300 * sin (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