Interactive drawing of a polygon row.

draw_polygon produces an image. The region of that image spans exactly the imagepoints entered interactively by mouse clicks (gray values remain undefined).

Painting in the output window happens while pressing the left mouse button. Releasing the left mouse button and repressing it at another position effects drawing a line between these two points. Pressing the right mouse button terminates the input. Painting uses that color which has been set by set_color, set_rgb, etc. .

To put gray values on the created PolygonRegion for further processing, you may use the procedure reduce_domain.

The painted contour is not closed automatically, in particular it is not ``filled up'' either.

Output object's gray values are not defined.

draw_polygon(Polygon,WindowHandle) 
shape_trans(Polygon,Filled,'convex') 
disp_region(Filled,WindowHandle).

If the window is valid, draw_polygon returns 2 (H_MSG_TRUE). If necessary, an exception handling is raised.

draw_polygon is reentrant, local, and processed without parallelization.

open_window

reduce_domain, disp_region, set_colored, set_line_width, set_draw

draw_region, draw_circle, draw_rectangle1, draw_rectangle2, boundary

reduce_domain, fill_up, set_color

Foundation