draw_xldT_draw_xldDrawXldDrawXlddraw_xld (算子)

名称

draw_xldT_draw_xldDrawXldDrawXlddraw_xld — 交互式绘制轮廓。

签名

描述

draw_xlddraw_xldDrawXldDrawXldDrawXlddraw_xld returns a contour, which has been created interactively by the user in the window.

Directly after calling draw_xlddraw_xldDrawXldDrawXldDrawXlddraw_xld you can add contour points by clicking with the left mouse button in the window at the desired positions. You delete the point appended last by pressing the Ctrl key. As soon as you add three contour points, 5 so-called pick points are displayed, one in the middle and 4 at the corners of the surrounding rectangle. By clicking on a pick point you can close the contour or open it again. If the contour is closed, the pick points are displayed in form of squares, otherwise they are shaped like a 'u'.

If the contour is closed you can

• move contour points by clicking with the left mouse button on a point marked by a rectangle and keep the mouse button pressed while moving the mouse,

• insert contour points by clicking with the left mouse button in the vicinity of a line and then move the mouse to the position where you want the new point to be placed, and

• delete contour points by selecting the point which should be deleted with the left mouse button and then press the Ctrl key.

By pressing the Shift key, you can switch into the transformation mode. In this mode you can rotate, move, and scale the contour as a whole, but only if you set the parameters RotateRotateRotateRotaterotaterotate, MoveMoveMoveMovemovemove, and ScaleScaleScaleScalescalescale, respectively, to 'true'"true""true""true""true""true". Instead of the pick points, 3 symbols are displayed with the contour: a cross in the middle and an arrow to the right if RotateRotateRotateRotaterotaterotate is set to 'true'"true""true""true""true""true", and a double-headed arrow to the upper right if ScaleScaleScaleScalescalescale is set to 'true'"true""true""true""true""true".

You can

• move the contour by clicking the left mouse button on the cross in the center and then dragging it to the new position,

• rotate it by clicking with the left mouse button on the arrow and then dragging it, till the contour has the right direction, and

• scale it by dragging the double arrow. To keep the ratio the parameter KeepRatioKeepRatioKeepRatioKeepRatiokeepRatiokeep_ratio has to be set to 'true'"true""true""true""true""true".

Pressing the right mouse button terminates the procedure.

注意

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

结果

draw_xlddraw_xldDrawXldDrawXldDrawXlddraw_xld returns 2 ( H_MSG_TRUE) , if the window is valid and the needed drawing mode (see set_insertset_insertSetInsertSetInsertSetInsertset_insert) is available。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, set_insertset_insertSetInsertSetInsertSetInsertset_insert

替代

draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2, draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region

另见

gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2GenRectangle2gen_rectangle2, draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle, draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipsedraw_ellipse, set_insertset_insertSetInsertSetInsertSetInsertset_insert

模块

基础

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