gen_grid_regiongen_grid_regionGenGridRegionGenGridRegiongen_grid_region (Operator)
Name
gen_grid_regiongen_grid_regionGenGridRegionGenGridRegiongen_grid_region — Create a region from lines or pixels.
Signature
Herror gen_grid_region(Hobject* RegionGrid, const Hlong RowSteps, const Hlong ColumnSteps, const char* Type, const Hlong Width, const Hlong Height)
Herror T_gen_grid_region(Hobject* RegionGrid, const Htuple RowSteps, const Htuple ColumnSteps, const Htuple Type, const Htuple Width, const Htuple Height)
void GenGridRegion(HObject* RegionGrid, const HTuple& RowSteps, const HTuple& ColumnSteps, const HTuple& Type, const HTuple& Width, const HTuple& Height)
void HRegion::GenGridRegion(const HTuple& RowSteps, const HTuple& ColumnSteps, const HString& Type, Hlong Width, Hlong Height)
void HRegion::GenGridRegion(Hlong RowSteps, Hlong ColumnSteps, const HString& Type, Hlong Width, Hlong Height)
void HRegion::GenGridRegion(Hlong RowSteps, Hlong ColumnSteps, const char* Type, Hlong Width, Hlong Height)
void HRegion::GenGridRegion(Hlong RowSteps, Hlong ColumnSteps, const wchar_t* Type, Hlong Width, Hlong Height)
(
Windows only)
static void HOperatorSet.GenGridRegion(out HObject regionGrid, HTuple rowSteps, HTuple columnSteps, HTuple type, HTuple width, HTuple height)
void HRegion.GenGridRegion(HTuple rowSteps, HTuple columnSteps, string type, int width, int height)
void HRegion.GenGridRegion(int rowSteps, int columnSteps, string type, int width, int height)
Description
The operator gen_grid_regiongen_grid_regionGenGridRegionGenGridRegiongen_grid_region creates a grid constructed
of lines (TypeTypeTypetypetype = 'lines') or pixels
(TypeTypeTypetypetype = 'points').
In case of 'lines' continuous lines are returned, in case of
'points' only the intersections of the lines.
Starting from the pixel (0,0) to the pixel
(HeightHeightHeightheightheight-1,WidthWidthWidthwidthwidth-1) the grid is
built up at stepping width RowStepsRowStepsRowStepsrowStepsrow_steps in row
direction and ColumnStepsColumnStepsColumnStepscolumnStepscolumn_steps in column direction.
The step widths have to be greater than 1.
Exceptions are in 'lines' mode RowStepsRowStepsRowStepsrowStepsrow_steps, where
RowStepsRowStepsRowStepsrowStepsrow_steps or ColumnStepsColumnStepsColumnStepscolumnStepscolumn_steps can be set equal to 0.
In such a case, only columns, rows respectively, are created.
Attention
If a very small pattern is chosen
(RowStepsRowStepsRowStepsrowStepsrow_steps < 4 or ColumnStepsColumnStepsColumnStepscolumnStepscolumn_steps
< 4) the created region requires much storage.
In the 'points' mode RowStepsRowStepsRowStepsrowStepsrow_steps and
ColumnStepsColumnStepsColumnStepscolumnStepscolumn_steps must not be set to zero.
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
RegionGridRegionGridRegionGridregionGridregion_grid (output_object) region → objectHRegionHObjectHObjectHobject *
Created lines/pixel region.
RowStepsRowStepsRowStepsrowStepsrow_steps (input_control) extent.y → HTupleUnion[float, int]HTupleHtuple (integer / real) (int / long / double) (Hlong / double) (Hlong / double)
Step width in line direction or zero.
Default:
10
Suggested values:
0, 2, 3, 4, 5, 7, 10, 15, 20, 30, 50, 100
Value range:
RowSteps
RowSteps
RowSteps
rowSteps
row_steps
(lin)
Minimum increment:
1
Recommended increment:
10
Restriction:
RowSteps > 1 || RowSteps == 0
ColumnStepsColumnStepsColumnStepscolumnStepscolumn_steps (input_control) extent.x → HTupleUnion[float, int]HTupleHtuple (integer / real) (int / long / double) (Hlong / double) (Hlong / double)
Step width in column direction or zero.
Default:
10
Suggested values:
0, 2, 3, 4, 5, 7, 10, 15, 20, 30, 50, 100
Value range:
ColumnSteps
ColumnSteps
ColumnSteps
columnSteps
column_steps
(lin)
Minimum increment:
1
Recommended increment:
10
Restriction:
ColumnSteps > 1 || ColumnSteps == 0
TypeTypeTypetypetype (input_control) string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)
Type of created pattern.
Default:
'lines'
"lines"
"lines"
"lines"
"lines"
List of values:
'lines'"lines""lines""lines""lines", 'points'"points""points""points""points"
WidthWidthWidthwidthwidth (input_control) extent.x → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Maximum width of pattern.
Default:
512
Suggested values:
128, 256, 512, 1024
Value range:
1
≤
Width
Width
Width
width
width
(lin)
Minimum increment:
1
Recommended increment:
10
HeightHeightHeightheightheight (input_control) extent.y → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Maximum height of pattern.
Default:
512
Suggested values:
128, 256, 512, 1024
Value range:
1
≤
Height
Height
Height
height
height
(lin)
Minimum increment:
1
Recommended increment:
10
Example (HDevelop)
read_image(Image,'fabrik')
gen_grid_region(Raster,10,10,'lines',512,512)
reduce_domain(Image,Raster,Mask)
sobel_amp(Mask,GridSobel,'sum_abs',3)
dev_display(GridSobel)
Example (C)
read_image(&Image,"fabrik");
gen_grid_region(&Raster,10,10,"lines",512,512);
reduce_domain(Image,Raster,&Mask);
sobel_amp(Mask,GridSobel,"sum_abs",3);
T_disp_image(GridSobel,WindowHandle);
Example (HDevelop)
read_image(Image,'fabrik')
gen_grid_region(Raster,10,10,'lines',512,512)
reduce_domain(Image,Raster,Mask)
sobel_amp(Mask,GridSobel,'sum_abs',3)
dev_display(GridSobel)
Example (HDevelop)
read_image(Image,'fabrik')
gen_grid_region(Raster,10,10,'lines',512,512)
reduce_domain(Image,Raster,Mask)
sobel_amp(Mask,GridSobel,'sum_abs',3)
dev_display(GridSobel)
Complexity
The necessary storage (in bytes) for the region is:
O((ImageWidth / ColumnSteps) * (ImageHeight / RowSteps))
Result
If the parameter values are correct the operator gen_grid_regiongen_grid_regionGenGridRegionGenGridRegiongen_grid_region
returns the value 2 (
H_MSG_TRUE)
.
Otherwise an exception is raised.
The clipping according to the current image format is set via the operator
set_system('clip_region',<'true'/'false'>)set_system("clip_region",<"true"/"false">)SetSystem("clip_region",<"true"/"false">)SetSystem("clip_region",<"true"/"false">)set_system("clip_region",<"true"/"false">).
Possible Successors
reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain,
paint_regionpaint_regionPaintRegionPaintRegionpaint_region
Alternatives
gen_region_linegen_region_lineGenRegionLineGenRegionLinegen_region_line,
gen_region_polygongen_region_polygonGenRegionPolygonGenRegionPolygongen_region_polygon,
gen_region_pointsgen_region_pointsGenRegionPointsGenRegionPointsgen_region_points,
gen_region_runsgen_region_runsGenRegionRunsGenRegionRunsgen_region_runs
See also
gen_checker_regiongen_checker_regionGenCheckerRegionGenCheckerRegiongen_checker_region,
reduce_domainreduce_domainReduceDomainReduceDomainreduce_domain
Module
Foundation