Flex Coordinate System

Global coordinate (stage coordinate) local coordinate content coordinate system map coordinate (mappoint)

Flash and flex provide three different coordinate systems for different purposes

Global is (stage-level)

Local Coordinate System (component-level)

Content coordinate system (relative to the local coordinate system)

Map coordinate (mappoint)

The points in these coordinate systems can be converted, and there are corresponding methods. It seems that Adobe is very thoughtful. Let's talk about it one by one.

Global

The origin of this coordinate system is in the upper left corner of the entire flash stage. stagex and stagey of the mouseevent instance are values in this coordinate system,

Local

The coordinate origin is the upper left corner of the relative component. localx and localy in mouseevent are relative to the coordinate system,

Content

This is a abstraction of the contentmousex andContentmouseyThat's it. This is mainly for the component with a scroll bar. If there is a scroll bar, there must be a lot of content. The coordinates of the area occupied by the content are the coordinate system.

Map coordinate (mappoint)

This is mainly the coordinate point on map in ArcGIS.

The following official figure shows the relationship and position of the Three Coordinate Systems:

There are also ready-made methods for Coordinate Transformation

 

Contentmousex	Returns the coordinates x of the mouse content.
Contentmousey	Returns the Y value of the mouse coordinate.
Contenttoglobal	Convert the content into global coordinates
Contenttolocal	Convert content into content coordinates
Globaltocontent	Convert global coordinates to content coordinates
Globaltolocal	Global to Local
Localtocontent	Coordinates from local to content
Localtoglobal	Local to global coordinates

 

 

 

 

 

Map. toscreen (): mappoint ----> local coordinates

Map. localtoglobal (): local coordinates ---> Global coordinates

Map. globaltolocal (): Global coordinate ---> Local Coordinate

Map. tomapfromstage (): Global coordinate ---> mappoint

_ Sprite. globaltolocal (): Global coordinate ---> Local Coordinate

Flex Coordinate System