Shapes of constant diameter (CREATOR)

This construction creates equidiametrals figures, ie at all times that each point of the border of the figure has constant distance from the opposite point

To start press " > " to start the movement. You can modify the points E, F , G, H , I, J , K , L in height to generate different equidiametrales figures. To verify that the figure actually is equidiametral can help visualization of a circle whose diameter is the R , R ' segment (to view click on the " DiametroCircunferencia " box ) Why the screen above shows only the X axis values ​​0-2 PI? Why can not modify the values ​​of E ', F ', G ' , H' , I ', J' , K ' , E' '? Why does not exist L ' and instead appears E' '?