drag_region1T_drag_region1DragRegion1DragRegion1drag_region1 (Operator)

Name

drag_region1T_drag_region1DragRegion1DragRegion1drag_region1 — Interactive moving of a region.

Warning

This operator does not work in an HDevelop graphics window opened with dev_open_window.

Signature

Description

drag_region1drag_region1DragRegion1DragRegion1drag_region1 is used to move a region on the display by mouse. Calling drag_region1drag_region1DragRegion1DragRegion1drag_region1 turns the region visible as soon as the left mouse button is pressed. Therefore the region's edges are displayed only. As representation mode the mode 'not' (see set_drawset_drawSetDrawSetDrawset_draw) is used during procedure's permanence. During the movement the cursor resides in the region's barycenter. If you move the mouse with pressed left mouse button, the depicted region follows - delayed - this movement. If you press the right mouse button you terminate drag_region1drag_region1DragRegion1DragRegion1drag_region1. The depicted region disappears from the display. Output is a region which corresponds to the last position on the display. You may pass even several regions at once. The operator affine_trans_imageaffine_trans_imageAffineTransImageAffineTransImageaffine_trans_image moves the gray values.

Attention

Gray values of regions are not moved. With moving the input region it is not sure whether the gray values of the output regions are filled reasonable. This may occur if the gray values of the input regions do not comprise the whole image.

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_region(Obj,WindowHandle)
dev_set_color ('green')
drag_region1(Obj,New,WindowHandle)
dev_display(New)
get_region_runs (Obj, Rows1, ColumnBegins1, ColumnEnds1)
get_region_runs (New, Rows2, ColumnBegins2, ColumnEnds2)
Row1 := Rows1[0]
Column1 := ColumnBegins1[0]
Row2 := Rows2[0]
Column2 := ColumnBegins2[0]
dev_set_color ('white')
gen_arrow_contour_xld (Arrow, Row1,Column1,Row2,Column2, 5, 5)
dev_display (Arrow)

draw_region(&Obj,WindowHandle);
drag_region1(Obj,&New,WindowHandle);
disp_region(New,WindowHandle);

draw_region(Obj,WindowHandle)
dev_set_color ('green')
drag_region1(Obj,New,WindowHandle)
dev_display(New)
get_region_runs (Obj, Rows1, ColumnBegins1, ColumnEnds1)
get_region_runs (New, Rows2, ColumnBegins2, ColumnEnds2)
Row1 := Rows1[0]
Column1 := ColumnBegins1[0]
Row2 := Rows2[0]
Column2 := ColumnBegins2[0]
dev_set_color ('white')
gen_arrow_contour_xld (Arrow, Row1,Column1,Row2,Column2, 5, 5)
dev_display (Arrow)

draw_region(Obj,WindowHandle)
dev_set_color ('green')
drag_region1(Obj,New,WindowHandle)
dev_display(New)
get_region_runs (Obj, Rows1, ColumnBegins1, ColumnEnds1)
get_region_runs (New, Rows2, ColumnBegins2, ColumnEnds2)
Row1 := Rows1[0]
Column1 := ColumnBegins1[0]
Row2 := Rows2[0]
Column2 := ColumnBegins2[0]
dev_set_color ('white')
gen_arrow_contour_xld (Arrow, Row1,Column1,Row2,Column2, 5, 5)
dev_display (Arrow)

Result

drag_region1drag_region1DragRegion1DragRegion1drag_region1 returns 2 ( H_MSG_TRUE) , if a region is entered, the window is valid and the needed drawing mode (see set_insertset_insertSetInsertSetInsertset_insert) is available. If necessary, an exception is raised. You may determine the behavior after an empty input with set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>).

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowopen_window

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain, disp_regiondisp_regionDispRegionDispRegiondisp_region, set_coloredset_coloredSetColoredSetColoredset_colored, set_line_widthset_line_widthSetLineWidthSetLineWidthset_line_width, set_drawset_drawSetDrawSetDrawset_draw, set_insertset_insertSetInsertSetInsertset_insert

Alternatives

get_mpositionget_mpositionGetMpositionGetMpositionget_mposition, move_regionmove_regionMoveRegionMoveRegionmove_region

See also

set_insertset_insertSetInsertSetInsertset_insert, set_drawset_drawSetDrawSetDrawset_draw, affine_trans_imageaffine_trans_imageAffineTransImageAffineTransImageaffine_trans_image

Module

Foundation