draw_polygon — Interactive drawing of a polygon row.
draw_polygon produces an image. The region of that image spans exactly the image points 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. On macOS draw_polygon can also be terminated by pressing the escape key. 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 operator 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.
Region, which encompasses all painted points.
draw_polygon(Polygon,WindowHandle) shape_trans(Polygon,Filled,'convex') dev_display (Filled)
If the window is valid, draw_polygon returns 2 (H_MSG_TRUE). If necessary, an exception is raised.
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