image.topixel - Function

Convert from world to pixel coordinate

Synopsis
topixel(value)

Arguments

value	in	Absolute world coordinate
		Allowed:	Numeric vector, vector of quantities or record
		Default:	Reference value

Returns
Vector of float or fail

Description

This function converts from absolute world to pixel coordinate (1-rel). The world coordinate can be provided in many formats (numeric, string, quantum etc.) via the argument value. These match the output formats of function toworld.

This function is just a wrapper for the Coordsys tool function topixel so see the documentation there for a description and more examples.

Example

- im := imagemaketestimage();
- w := im.toworld([10,10], 'n')        # Numeric vector
- im.topixel(w)
[10 10]
- w := im.toworld([10,10], 'm')        # Record of measures
- im.topixel(w)
[10 10]

Convert to a pixel coordinate to world as floats and then back to pixel. Do the same with the world coordinate formatted as measures instead.

Next: image.toworld - Function Up: image - Tool Previous: image.type - Function Contents Index

	Package	general
	Module	images
	Tool	image