Difference between revisions of "Precise Shadowcasting in JavaScript"
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== Links == | == Links == | ||
* [http://jsfiddle.net/ondras/ycJVj/ | * [http://jsfiddle.net/ondras/ycJVj/ Interactive demo] | ||
* [http://ondras.github.com/rot.js/manual/#fov | * [http://ondras.github.com/rot.js/manual/#fov rot.js FOV manual] | ||
* [https://raw.github.com/ondras/rot.js/master/src/fov/precise-shadowcasting.js | * [https://raw.github.com/ondras/rot.js/master/src/fov/precise-shadowcasting.js Source code] | ||
Revision as of 15:30, 3 January 2013
This pages describes and explains the Precise Shadowcasting algorithm, developed and implemented by Ondřej Žára in rot.js.
WORK IN PROGRESS
About
General algorithm workflow
- Let
[x,y]be the player coordinates - Initialize the empty shadow queue
- For
R=1up to maximum visibility range do:- Retrieve all cells whose range from
[x,y]isR - Make sure these cells are in correct order (clockwise or counter-clockwise; every iteration starting at the same angle)
- For every cell in this "ring":
- Determine the corresponding arc
[a1,a2] - Consult the shadow queue to determine whether
[a1,a2]is fully shadowed - If no part of
[a1,a2]is visible, mark the cell as not visible and advance to next cell - If some part of
[a1,a2]is visible, merge it into the shadow queue; mark the cell as visible
- Determine the corresponding arc
- Retrieve all cells whose range from