draw_polygonT_draw_polygonDrawPolygonDrawPolygondraw_polygon (算子)

名称

draw_polygonT_draw_polygonDrawPolygonDrawPolygondraw_polygon — 交互式绘制多边形行。

签名

draw_polygon( : PolygonRegion : WindowHandle : )

描述

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. 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。

注意

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.

执行信息

多线程类型：可重入（与非独占算子并行运行）。
多线程作用域：全局（可从任何线程调用）。
未采用并行化处理。

参数

PolygonRegionPolygonRegionPolygonRegionPolygonRegionpolygonRegionpolygon_region (输出对象) region → object

Region, which encompasses all painted points.

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (输入控制) window → (handle)

窗口句柄。

示例（HDevelop）

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

示例（C）

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

示例（HDevelop）

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

示例（HDevelop）

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

示例（HDevelop）

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

结果

If the window is valid, draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygondraw_polygon 返回 2 ( H_MSG_TRUE )。如有必要，则抛出异常。

可能的前趋

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

可能的后继

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, disp_regiondisp_regionDispRegionDispRegionDispRegiondisp_region, set_coloredset_coloredSetColoredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawSetDrawset_draw

替代

draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region, draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2, boundaryboundaryBoundaryBoundaryBoundaryboundary

另见

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, fill_upfill_upFillUpFillUpFillUpfill_up, set_colorset_colorSetColorSetColorSetColorset_color

模块

基础

算子