Drag (Free) component was one of most used component by teachers. It's simple to use which allows students to arrange objects on the screen, with the ability to reuse an object. It is good for students to express their ideas.
Now two functions, scale and rotate the object, are added for using widely. Students can also move the unwanted object to the trash which avoid wasting screen space. Furthermore, this component's dragging direction can be limited to horizontal only or vertical only.