Search code examples
javarotationacm-java-librariesgpolygon

Java how to use clear() from acm?

I create an object (GPolygon), add it to canvas, i rotate it and then i want to reset the rotation, to come back where started. I look at acm page and there is a method called clear() but i can't acces it, probaly because is protected. Text from http://www-cs-faculty.stanford.edu/~eroberts//jtf/javadoc/complete/acm/graphics/GPolygon.html#clear()

How can i use the method clear() on this object? Here is my Polygon code : Java

    GPolygon patrat=new GPolygon(30,30);
    patrat.setFilled(true);
    patrat.setColor(Color.RED);
    patrat.addVertex(0, 0);
    patrat.addEdge(20, 0);
    patrat.addEdge(0,20);
    add(patrat);
    patrat.rotate(10);

Thank you !

Solution

  • You can call patrat.rotate(-10) when you want to reset the rotation.

    Typically, the way for you to use the protected clear() method is through inheritance (i.e. MyClass extends GPolygon, etc).