* FILE

You may open or save a geometry file.







* A_POINT(plotting a point)

By selecting this command, you may plot a point in the sketch window.









* A_LINE(drawing a line segment by selecting two points)

  By selecting this command, you may draw a line segment with selecting two points. 
  If you select a point already existing on the line, its color will be turned to be red.








* PERPENDICULAR(drawing a perpendicular line by selecting a line segment and a point)

  The selections of a line(segment) and a point will draw a perpendicular line to the selected line (segment). 







* PARALLEL_L(drawing a parallel line by selecting a line(segment) and a point)

  Selecting any line(segment) and a point draws a parallel line to the selected line(segment). 







* INTERSECT_P(defining intersected point(s) of two lines)

  Selection of two intersected objects like line(segment), circle show the mark(s) at the point(s) of intersection. 









* CIRCLE(forming a circle by dragging from the point of center)

  Selection of the point of center and dragging from it form a circle.(Even after formation of a circle, you may move/enlarge/shrink the circle.)







* HIDE_OBJECT(hiding a basic object like a point, a line, a circle, etc.)

  You may hide a basic object like a point, a line(segment) by selecting such a object.







* UNDO

You may undo the previous operation.






* LABEL

  You may name any arbitrary name on such a object like point, line(segment), circle, angle, length, etc. by selecting such a object.






* COMMENTING

  You may insert a comment at any place you like on the sketch window. 









* MOVE_OBJECT(Moving a line or a point)

 You make the mouse close to any point or any line. If the object appears blinkling or changes its color to red, you may move the object by dragging.






* MEASURE_LENGTH(measuring the length between two points)

  By selecting two points, you may measure the length between them.  







* MEASURE_ANGLE(measuring an angle)

  You may measure the angle formed by the selection of three points with the second point of selection signifying the center of the angle.













* ERASE

  You may erase an object like,  point, line, label, comment, etc.






* COLOR_IT

 You may select the color to paint from color table and paint the object you select with the selected color.







* SECTOR

  You may form a sector by (1) plotting a center point, (2) pointing the right end of arc, (3)specifying the counter-clockwise angle from the right end of arc by a click.

 The sector formed by this command may be colored by COLOR_IT command.






* POLYGON

  You may form a polygon by selecting each consecutive nodes. The final node has to be made at the initial node for closing the polygon.

  The polygon formed by this command may be colored by COLOR_IT command.









* PRINT

You may print the geometrical shape on sketch window.















