ClassesClasses | | Operators

projection_plprojection_plProjectionPlProjectionPl (Operator)

Name

projection_plprojection_plProjectionPlProjectionPl — Calculate the projection of a point onto a line.

Signature

projection_pl( : : Row, Column, Row1, Column1, Row2, Column2 : RowProj, ColProj)

Herror projection_pl(double Row, double Column, double Row1, double Column1, double Row2, double Column2, double* RowProj, double* ColProj)

Herror T_projection_pl(const Htuple Row, const Htuple Column, const Htuple Row1, const Htuple Column1, const Htuple Row2, const Htuple Column2, Htuple* RowProj, Htuple* ColProj)

void ProjectionPl(const HTuple& Row, const HTuple& Column, const HTuple& Row1, const HTuple& Column1, const HTuple& Row2, const HTuple& Column2, HTuple* RowProj, HTuple* ColProj)

static void HMisc::ProjectionPl(const HTuple& Row, const HTuple& Column, const HTuple& Row1, const HTuple& Column1, const HTuple& Row2, const HTuple& Column2, HTuple* RowProj, HTuple* ColProj)

static void HMisc::ProjectionPl(double Row, double Column, double Row1, double Column1, double Row2, double Column2, double* RowProj, double* ColProj)

static void HOperatorSet.ProjectionPl(HTuple row, HTuple column, HTuple row1, HTuple column1, HTuple row2, HTuple column2, out HTuple rowProj, out HTuple colProj)

static void HMisc.ProjectionPl(HTuple row, HTuple column, HTuple row1, HTuple column1, HTuple row2, HTuple column2, out HTuple rowProj, out HTuple colProj)

static void HMisc.ProjectionPl(double row, double column, double row1, double column1, double row2, double column2, out double rowProj, out double colProj)

Description

The operator projection_plprojection_plProjectionPlProjectionPlProjectionPl calculates the projection of a point (RowRowRowRowrow,ColumnColumnColumnColumncolumn) onto a line which is represented by the two points (Row1Row1Row1Row1row1,Column1Column1Column1Column1column1) and (Row2Row2Row2Row2row2,Column2Column2Column2Column2column2). The coordinates of the projected point are returned in RowProjRowProjRowProjRowProjrowProj and ColProjColProjColProjColProjcolProj.

Execution Information

Parameters

RowRowRowRowrow (input_control)  point.y(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Row coordinate of the point.

ColumnColumnColumnColumncolumn (input_control)  point.x(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Column coordinate of the point.

Row1Row1Row1Row1row1 (input_control)  point.y(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Row coordinate of the first point on the line.

Column1Column1Column1Column1column1 (input_control)  point.x(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Column coordinate of the first point on the line.

Row2Row2Row2Row2row2 (input_control)  point.y(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Row coordinate of the second point on the line.

Column2Column2Column2Column2column2 (input_control)  point.x(-array) HTupleHTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)

Column coordinate of the second point on the line.

RowProjRowProjRowProjRowProjrowProj (output_control)  real(-array) HTupleHTupleHtuple (real) (double) (double) (double)

Row coordinate of the projected point.

ColProjColProjColProjColProjcolProj (output_control)  real(-array) HTupleHTupleHtuple (real) (double) (double) (double)

Column coordinate of the projected point

Example (HDevelop)

dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
Row1 := 300
Column1 := 200
Row2 := 140
Column2 := 400
Rows := 300
Columns := 170
dev_set_color ('cadet blue')
gen_contour_polygon_xld (Contour, [Row1,Row2], [Column1,Column2])
Offset := 0
for Rows := 40 to 280 by 40
  dev_set_color ('red')
  gen_cross_contour_xld (Point,Rows+Offset, Columns, 6, 0)
  projection_pl (Rows+Offset, Columns, Row1, Column1, Row2, Column2, \
                 RowProj, ColProj)
  dev_set_color ('blue')
  gen_cross_contour_xld (RowP, RowProj, ColProj, 6, 0)
  Offset := Offset+30
endfor

Example (C)

projection_pl(row,column,row1,column1,row2,column2,
              &row_proj,&col_proj);

Example (HDevelop)

dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
Row1 := 300
Column1 := 200
Row2 := 140
Column2 := 400
Rows := 300
Columns := 170
dev_set_color ('cadet blue')
gen_contour_polygon_xld (Contour, [Row1,Row2], [Column1,Column2])
Offset := 0
for Rows := 40 to 280 by 40
  dev_set_color ('red')
  gen_cross_contour_xld (Point,Rows+Offset, Columns, 6, 0)
  projection_pl (Rows+Offset, Columns, Row1, Column1, Row2, Column2, \
                 RowProj, ColProj)
  dev_set_color ('blue')
  gen_cross_contour_xld (RowP, RowProj, ColProj, 6, 0)
  Offset := Offset+30
endfor

Example (HDevelop)

dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
Row1 := 300
Column1 := 200
Row2 := 140
Column2 := 400
Rows := 300
Columns := 170
dev_set_color ('cadet blue')
gen_contour_polygon_xld (Contour, [Row1,Row2], [Column1,Column2])
Offset := 0
for Rows := 40 to 280 by 40
  dev_set_color ('red')
  gen_cross_contour_xld (Point,Rows+Offset, Columns, 6, 0)
  projection_pl (Rows+Offset, Columns, Row1, Column1, Row2, Column2, \
                 RowProj, ColProj)
  dev_set_color ('blue')
  gen_cross_contour_xld (RowP, RowProj, ColProj, 6, 0)
  Offset := Offset+30
endfor

Example (HDevelop)

dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
Row1 := 300
Column1 := 200
Row2 := 140
Column2 := 400
Rows := 300
Columns := 170
dev_set_color ('cadet blue')
gen_contour_polygon_xld (Contour, [Row1,Row2], [Column1,Column2])
Offset := 0
for Rows := 40 to 280 by 40
  dev_set_color ('red')
  gen_cross_contour_xld (Point,Rows+Offset, Columns, 6, 0)
  projection_pl (Rows+Offset, Columns, Row1, Column1, Row2, Column2, \
                 RowProj, ColProj)
  dev_set_color ('blue')
  gen_cross_contour_xld (RowP, RowProj, ColProj, 6, 0)
  Offset := Offset+30
endfor

Result

projection_plprojection_plProjectionPlProjectionPlProjectionPl returns 2 (H_MSG_TRUE).

Module

Foundation


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