Celestia/Celx Scripting/CELX Lua Methods/CEL command chase

chase
chase { } 

Tells Celestia to set the active Coordinate System to chase, which chases the currently selected object through space.

The command has no arguments.

CELX equivalent-1:

Based on the observer:setframe method.


 * Find the target object with name  to be chased and store in "objectname".

objectname = celestia:find(  )


 * Create new frame of reference to chase with "objectname" as reference object and store in "frame".

frame = celestia:newframe("chase", objectname)


 * Get observer instance of the active view and set the coordinate system of the frame of reference to "frame".

obs = celestia:getobserver obs:setframe(frame)

Summarized:

objectname = celestia:find(  ) frame = celestia:newframe("chase", objectname) obs = celestia:getobserver obs:setframe(frame)

CELX equivalent-2:

Based on the observer:chase method.


 * Find the target object with name to be chased and store in "objectname".

objectname = celestia:find(  )


 * Get observer instance of the active view and activate chase-mode on "objectname". Chase-mode is the same as setting the frame of reference to chase with objectname as reference object.

obs = celestia:getobserver obs:chase(objectname)

Summarized:

objectname = celestia:find(  ) obs = celestia:getobserver obs:chase(objectname)

Example:

The following example selects the Moon, sets the Coordinate System to chase, and then goes to the Moon:

CEL:

select { object "Sol/Earth/Moon" } chase { } goto  { time 2 } wait  { duration 2 }

CELX-1 with observer:setframe method:

moon = celestia:find("Sol/Earth/Moon") celestia:select(moon) frame = celestia:newframe("chase", moon) obs = celestia:getobserver obs:setframe(frame) obs:goto(moon, 2.0) wait(2.0)

CELX-2 with observer:chase method:

moon = celestia:find("Sol/Earth/Moon") celestia:select(moon) obs = celestia:getobserver obs:chase(moon) obs:goto(moon, 2.0) wait(2.0)

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