set_line_approxT_set_line_approxSetLineApproxSetLineApprox (Operator)
Name
set_line_approxT_set_line_approxSetLineApproxSetLineApprox — Define the approximation error for contour display.
Warning
set_line_approxset_line_approxSetLineApproxSetLineApproxSetLineApprox is obsolete and is only provided for
reasons of backward compatibility.
Signature
Description
set_line_approxset_line_approxSetLineApproxSetLineApproxSetLineApprox defines the approximation error for region and xld
contour display in the window WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle. ApproximationApproximationApproximationApproximationapproximation
values greater than zero cause an approximation of line strokes using less
points. This may enable faster and in some cases smoother visualization. The
parameter describes the maximal deviation in pixels of the approximated
contour from the original contour (Ramer-Douglas-Peucker algorithm).
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
WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle (input_control) window → HWindow, HTupleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)
Window handle.
ApproximationApproximationApproximationApproximationapproximation (input_control) integer → HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Maximum deviation from the original contour.
Default value: 0
Typical range of values: 0
≤
Approximation
Approximation
Approximation
Approximation
approximation
Restriction: Approximation >= 0
Example (HDevelop)
* Calling...
set_line_approx(WindowHandle,Approximation)
set_draw(WindowHandle,'margin')
disp_region(Obj,WindowHandle)
* ...corresponds with
get_region_polygon(Obj,Approximation,Row,Col)
disp_polygon(WindowHandle,Row,Col)
Example (C)
/* Calling... */
T_set_line_approx(WindowHandle,Approximation);
create_tuple_s(mode,"margin");
T_set_draw(WindowHandle, mode);
destroy_tuple(mode);
T_disp_region(Obj,WindowHandle);
/* ...corresponds with */
create_tuple_i(&approximation,0);
create_tuple(&row,0);
create_tuple(&col,0);
T_get_region_polygon(Obj,approximation,&row,&col);
destroy_tuple(approximation);
T_disp_polygon(WindowHandle,row,col);
destroy_tuple(row); destroy_tuple(col);
Example (HDevelop)
* Calling...
set_line_approx(WindowHandle,Approximation)
set_draw(WindowHandle,'margin')
disp_region(Obj,WindowHandle)
* ...corresponds with
get_region_polygon(Obj,Approximation,Row,Col)
disp_polygon(WindowHandle,Row,Col)
Example (HDevelop)
* Calling...
set_line_approx(WindowHandle,Approximation)
set_draw(WindowHandle,'margin')
disp_region(Obj,WindowHandle)
* ...corresponds with
get_region_polygon(Obj,Approximation,Row,Col)
disp_polygon(WindowHandle,Row,Col)
Example (HDevelop)
* Calling...
set_line_approx(WindowHandle,Approximation)
set_draw(WindowHandle,'margin')
disp_region(Obj,WindowHandle)
* ...corresponds with
get_region_polygon(Obj,Approximation,Row,Col)
disp_polygon(WindowHandle,Row,Col)
Result
set_line_approxset_line_approxSetLineApproxSetLineApproxSetLineApprox returns 2 (H_MSG_TRUE) if the parameter is
correct and the window is valid. Otherwise an exception is raised.
Possible Predecessors
get_line_approxget_line_approxGetLineApproxGetLineApproxGetLineApprox
Possible Successors
disp_regiondisp_regionDispRegionDispRegionDispRegion
Alternatives
get_region_polygonget_region_polygonGetRegionPolygonGetRegionPolygonGetRegionPolygon,
disp_polygondisp_polygonDispPolygonDispPolygonDispPolygon
See also
get_line_approxget_line_approxGetLineApproxGetLineApproxGetLineApprox,
set_line_styleset_line_styleSetLineStyleSetLineStyleSetLineStyle,
set_drawset_drawSetDrawSetDrawSetDraw,
disp_regiondisp_regionDispRegionDispRegionDispRegion,
disp_polygondisp_polygonDispPolygonDispPolygonDispPolygon
Module
Foundation