You are here: Start » AVL.NET » Function Reference » Geometry 2D » Geometry 2D Spatial Transforms » AVL.PointAlongArc

AVL.PointAlongArc

Transforms a point to a coordinate system in which the 'axis' arc is vertical or horizontal.

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax

C++
C#
 
public static void PointAlongArc
(
	AvlNet.Point2D inPoint,
	AvlNet.Arc2D inAxis,
	AvlNet.Axis inAxisType,
	float inAxisCoordinate,
	bool inInverse,
	out AvlNet.Point2D outPoint
)

Parameters

Name Type Range Default Description
inPointAvlNet.Point2DInput point.
inAxisAvlNet.Arc2DInput axis arc.
inAxisTypeAvlNet.AxisYType of axis the input axis arc is parallel to. Default value: Y.
inAxisCoordinatefloat0.0fCoordinate of the axis arc. Default value: 0.0f.
inInverseboolTrueSwitches to the inverse operation. Default value: True.
outPointAvlNet.Point2DTransformed point.

Description

This operation transforms a point - inPoint - between two coordinate systems: the one linked with 'axis' arc inAxis and the original one. Direction of this conversion is based on inInverse value:

  • if it is true, inPoint is converted to original coordinate system
  • if it is false, inPoint is converted from original coordinate system

Coordinate system linked with inAxis is some transformation of the original one, satisfying these conditions:

  • 'axis' arc is represented as a straight line
  • 'axis' arc is horizontal if inAxisType is set to X or vertical if inAxisType is set to Y
  • if inAxisType is set to X, the Y coordinate of 'axis' arc is equal to inAxisCoordinate. If inAxisType is set to Y, the X coordinate of 'axis' arc is equal to inAxisCoordinate

Examples

ImageAlongArc performed on the sample image with inAxisType = X and inScanWidth = 50. Point marked with green cross on the output image was calculated by ScanSingleEdge. Original point (marked with blue cross) was calculated using PointAlongArc with inAxisType = X, inAxisCoordinate = 25, inInverse = true and position of detected point. ImageAlongArc and PointAlongArc used the same arc for transformations.

See also