draw_polygonT_draw_polygonDrawPolygonDrawPolygondraw_polygon (Operator)

Name

draw_polygonT_draw_polygonDrawPolygonDrawPolygondraw_polygon — Interactive drawing of a polygon row.

Signature

Description

draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygondraw_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_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygondraw_polygon can also be terminated by pressing the escape key. Painting uses that color which has been set by set_colorset_colorSetColorSetColorSetColorset_color, set_rgbset_rgbSetRgbSetRgbSetRgbset_rgb, etc. .

To put gray values on the created PolygonRegionPolygonRegionPolygonRegionPolygonRegionpolygonRegionpolygon_region for further processing, you may use the operator reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain.

Attention

The painted contour is not closed automatically, in particular it is not “filled up” either.

Output object's gray values are not defined.

If used in a buffer window, mouse events have to be supplied by the application, while the draw operator must be run in another thread.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

Parameters

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

draw_polygon(&Polygon,WindowHandle);
shape_trans(Polygon,&Filled,"convex");
disp_region(Filled,WindowHandle);

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

Result

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

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, disp_regiondisp_regionDispRegionDispRegionDispRegiondisp_region, set_coloredset_coloredSetColoredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawSetDrawset_draw

Alternatives

draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region, draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2, boundaryboundaryBoundaryBoundaryBoundaryboundary

See also

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, fill_upfill_upFillUpFillUpFillUpfill_up, set_colorset_colorSetColorSetColorSetColorset_color

Module

Foundation