draw_regionT_draw_regionDrawRegionDrawRegion (Operator)

Name

draw_regionT_draw_regionDrawRegionDrawRegion — Interactive drawing of a closed region.

Signature

Description

draw_regiondraw_regionDrawRegionDrawRegionDrawRegion produces an image. The region of that image spans exactly the image region entered interactively by mouse clicks (gray values remain undefined). Painting happens in the output window while keeping the left mouse button pressed. The left mouse button even operates by clicking in the output window; through this a line between the previous clicked points is drawn. Clicking the right mouse button terminates input and closes the outline. Subsequently the image is “filled up”. Also it contains the whole image area enclosed by the mouse.

Painting uses that color which has been set by set_colorset_colorSetColorSetColorSetColor, set_rgbset_rgbSetRgbSetRgbSetRgb, etc. .

Pressing the right mouse button terminates the procedure. On macOS draw_regiondraw_regionDrawRegionDrawRegionDrawRegion can also be terminated by pressing the escape key.

Attention

The 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

read_image(Image,'fabrik')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)

read_image(&Image,"fabrik");
disp_image(Image,WindowHandle);
draw_region(&Region,WindowHandle);
reduce_domain(Image,Region,&New);
regiongrowing(New,&Segmente,5,5,6,50);
set_colored(WindowHandle,12);
disp_region(Segmente,WindowHandle);

read_image(Image,'fabrik')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)

read_image(Image,'fabrik')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)

read_image(Image,'fabrik')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,ImageReduced)
invert_image (ImageReduced, ImageInvert)
dev_display (ImageInvert)

Result

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

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowOpenWindow

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, disp_regiondisp_regionDispRegionDispRegionDispRegion, set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, set_drawset_drawSetDrawSetDrawSetDraw

Alternatives

draw_circledraw_circleDrawCircleDrawCircleDrawCircle, draw_ellipsedraw_ellipseDrawEllipseDrawEllipseDrawEllipse, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2

See also

draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygon, reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, fill_upfill_upFillUpFillUpFillUp, set_colorset_colorSetColorSetColorSetColor

Module

Foundation